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Rest.X66.P01

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Rest.X66.P01 Powered By Docstoc
					    by Dan Vigin
Annual Convention 2008
   Cancun Mexico

        Part 1           1
TABLE OF CONTENTS                             Restoring Hammond X-66



    Table of Contents.




     Description           Nbr of Slides Level

     Part One.

     - Introduction                       6                                  -
     - Power Supply Unit   5                              *
     - Keyboards                     12                   ****
     - Pedal Keyboard                     6                            **
     - Expression Pedal                   3                            **
     - Drawbars                           6                            ***
     - Outlets panel                      5                            **
     - Mechanical works    4                              ***



                                     Part 1                                      2
TABLE OF CONTENTS                               Restoring Hammond X-66



    Table of Contents.



     Description             Nbr of Slides Level

     Part Two.

     - Scanners                        13                   ****
     - Reverb                               2                            *
     - Arpeggiator           6                              *****
     - Tab Controls                         3                            ***
     - Tibia Flute Filters                  2                            *
     - Preamps                              8                            ***
     - TWG / Dividers                       7                            ***
     - Special Effects                      4                            **
     - Sforzando                            6                            ***
     - Percussion Keyers     3                              **


                                       Part 1                                  3
TABLE OF CONTENTS                                       Restoring Hammond X-66



    Table of Contents.




     Description                     Nbr of Slides Level

     Part Three.

     - Tone Cabinet TC 12-77         7                              ***
     - Addons: X-Tal Generator 5                  ***
     - Addons: Stand-by PSU          3                              *
     - Addons: Leslie Preamp         4                              ***
     - Addons: Leslie Motor Contr.   4                              ***
     - Addons: Midi on Upper Kbd




                                               Part 1                            4
INTRODUCTION                                                     Restoring Hammond X-66




      DISCLAIMER

      This information is for educational purposes only and no claims are made that this information will lead to
      any successful repair or the like.

      Dan.Vigin assumes no reponsibility to its use.




                                                        Part 1                                                      5
INTRODUCTION                           Restoring Hammond X-66




               The story began in an antique shop at Ostende in April ‘07.

               Only three X-66’s were sold in Belgium. Two of them disappeared in the
               nature, the last one was there.

               The X-66 was standing in the back store, dusty, simply awful and totally
               dead.

               Even so, after strong negociations on price with the vendor, I bought it for an
               acceptable price.

               That was seen from the outside.




                              Part 1                                                     6
INTRODUCTION                           Restoring Hammond X-66




               The inside was even worst.

               Additional circuits to drive external synthesizer were integrated in the upper
               keyboard. Midi was not yet born at that time.


               The output preamp PCB needed for the Leslie was just fixed with foam !
               Unbelievable.


               The switching relay for Leslie motor speed was left hanging nearby the supply
               panel without any safety precaution. Incredible !




                              Part 1                                                       7
INTRODUCTION                             Restoring Hammond X-66



               Those addon’s were really poorly mounted by unqualified technician.

               In addtion to that, the Tone Cabinet
               was also totally inoperative.
               All five built-in power amplifiers were burnt, dead. A dedicated chapter is
               dedicated to TC-1277 in Part 3.

               Four missing contacts on pedal keyboard.

               Fortunately, beside some heavy scratches on the cabinet and faulty connecting
               cable, the Leslie 145 delivered with was still in quite acceptable conditions.




                                Part 1                                                       8
INTRODUCTION                                                        Restoring Hammond X-66


      HOW TO START RESTORING NOW ?

      1. The first phase of operation was to remove all that junk: useless circuits, relays, associated cabling, etc..
      and to put back the X-66 in its original state as ‘freshly’ delivered from factory.
      This includes the cosmetic aspect as well.

      2. Then after achieving that, the next step is to switch ON the console and try to establish a diagnostic of
      all the problems encountered and there are…

      3. Afterwards, after having restored both X-66 console and Tone Cabinet, it is now possible to
      « improve and personalize » some parts, adding Leslie preamps and motor controls circuits, X-Tal
      generator, Midi, etc…




                                                           Part 1                                                        9
INTRODUCTION                                                       Restoring Hammond X-66




     WHERE TO START RESTORING NOW ?


     The sequence to start ‘refurbishing’ is not relevant since in this case, almost every section has to be
     carefully cleaned, rebuilt, controlled and properly re-installed.

     If one wants to get some sound out of an organ, it’s always better to rely on a working audio system
     behind it.

     That’s why, I started by this part which seemed the simplest one to my opinion. TC-1277 will be covered
     in Part 3.




                                                          Part 1                                               10
POWER SUPPLY                                                        Restoring Hammond X-66


   REBUILDING THE POWER SUPPLY UNIT

   Feeding all circuits with the adequate resources (i.e. correct voltages while supplying the needed currents) is basic
   and self-evident. That’s the function of the PSU.




   Technically spoken, this part is rather elementary.
   The weakest components are the filter capacitors.
   After more than 40 years, those ‘ Elco’s ‘ become dry, leaky, out of specs… I even found one elco that was
   totally ‘opened’, that means totally useless !


                                                           Part 1                                                     11
POWER SUPPLY                                                     Restoring Hammond X-66


   REBUILDING THE POWER SUPPLY UNIT

   Throw all those caps out and replace by new filter caps providing so a better long term stability.
   Power resistors installed outside the PSU need some attention too. Values have to be checked and replaced if
   needed.



                                                                      Take this opportunity to also check the rectifier
                                                                      diodes. Forward resistance should be similar, if not
                                                                      replace them as well.

                                                                      Rescrew thoroughly all GND points.
                                                                      Very important !




                                                        Part 1                                                       12
POWER SUPPLY                                                     Restoring Hammond X-66


   REBUILDING THE POWER SUPPLY UNIT

   Safety: the way the Hammond’s and Leslie’s were manufactured in the 60’s was not at all in line with the safety
   regulations, at least for the European market. In combination with the output panel, all safety improvements
   were implemented to comply with EU Class I safety regulations. Important !




                                                             Attached picture exhibits the PSU with new filter caps
                                                             (for PCB mounting) installed on a bakelite panel since
                                                             original filter caps are no more available.




                                                        Part 1                                                   13
POWER SUPPLY                                                     Restoring Hammond X-66


   REBUILDING THE POWER SUPPLY UNIT

   After crosscheck with the schematic diagram, connect the PSU via a variable auto-transformer.
   Slowly increase the voltage and monitor the current. When the nominal AC mains voltage is reached, let it like
   warm up for several hours, the time needed to ‘reformat’ the new Elco’s.




                                    VARIAC
                                                                                               -135V
                                                                                               +28V
                                                                                               +3V
                                                                                               -12V
                   L                                                                           -5V

         230V ac                                            Am                                         +12V
                                                                                                       +250V
                                                          OUT                  X-66 Power
                   N                                                                                   GND
                                                Vm    0 ~ 260 Vac             Supply Unit *



                                                                         * Resistor panel included.


                                                        Part 1                                                      14
POWER SUPPLY                                                     Restoring Hammond X-66


   REBUILDING THE POWER SUPPLY UNIT


   Everything looks fine now.
   Check all the DC output voltages at the PSU voltage receptacle and resistor panel.



                                                                      Measurements will indicate values slightly higher
                                                                      than when under operation.
                                                                      Quite normal, don’t worry about that now.

                                                                      PSU is now completed and ready for use.




                                                        Part 1                                                      15
KEYBOARDS                                                       Restoring Hammond X-66


   RENOVATING THE KEYBOARDS

   Keyboards are the interfaces between the core of the instrument and the player. We are permanently touching
   those parts with hands, that's why keyboards must be as perfect as possible.




                      Before                                              After


                                                       Part 1                                                    16
KEYBOARDS                                                           Restoring Hammond X-66


   RENOVATING THE KEYBOARDS

   Keyboards must be attractive : I mean by that: pleasing and identical pressure on all keys, well damped, noise-
   free when releasing, perfect alignments, no lateral slack generating 'clicks' side noise on gliding, identical contacts
   activation and of course perfectly cleaned, free of scratches, 'super-polished up' keys.




                                                                    ‚Everything to render the organist envious to touch
                                                                    keyboards sit down on the bench and start playing.
                                                                    Evidently, this elementary principle is not peculiar to X-
                                                                    66 consoles but applicable as well to most of keyboards
                                                                    instruments‛.




                                                           Part 1                                                       17
KEYBOARDS                                                        Restoring Hammond X-66


   DISMOUNTING KEYBOARDS & CLEANING

   All the keys can be easily dismounted and should be numbered. Keys can be easily scratched with the springs.
   After removal, it’s now great time to remove dust and various foreign objects with vacuum cleaner and start
   cleaning with alcohol, spray’s …




                      BEFORE                                          AFTER
                                                        Part 1                                                    18
KEYBOARDS                                   Restoring Hammond X-66


   REPAIRING BROKEN KEYS


                           Many black and white keys were found broken on my X-66.

                           Evidently, the simplest way is to replace them by new ones if you
                           can still find them.

                           Mechanically, it’s certainly the best way to go but the shades of
                           white keys will not match anymore !

                           So, whenever possible, try to fix and re-use the original keys, at least
                           for the white ones.




                                   Part 1                                                       19
KEYBOARDS                                                        Restoring Hammond X-66


   REPAIRING BROKEN KEYS


                                                       Most of the time, the rear plastic holder is broken.
                                                       Re-glue it with cyanolit glue in its initial position.
                                                       Each fixation screw is equipped with a crimped lockwasher that
                                                       has to be removed (not so easy without damaging threats).




    Grease both screws and gently rescrew them.
    By doing so, the threat has gained about 2 mm in length in the non-broken part of the holder which is sufficient
    to restore the mechanical fixation. Afterwards, for better reinforcing purpose, epoxy glue can be applied on the
    rear side.



                                                        Part 1                                                  20
KEYBOARDS                                                           Restoring Hammond X-66


   CRADLE ADJUSTMENT

   With aging, the tension spring was too weak and had insufficient pressure to bring the rod back in its correct
   position. Preset keys were inoperative.



 Small hole




Coil spring


    A small hole was drilled in the stop felt bracket and coil spring installed. Easy and effective !


                                                           Part 1                                                   21
KEYBOARDS                                                           Restoring Hammond X-66


   CONTACTS & BUSBARS CLEANING

   This section only pertains to the Upper keyboard.
   This operation requires a certain skill and ….a lot of patience.




                                                                                Firstly, unscrew the fasteners located at the
                                                                                rear side of the keyboard and disengage the
                                                                                whole row of keying modules as shown on
                                                                                picture.




                                                           Part 1                                                        22
KEYBOARDS                                                         Restoring Hammond X-66


   CONTACTS & BUSBARS CLEANING
   Start by removing the Presets busbars and clean carefully each busbar with alcohol.       Presets
   contacts are so rendered free.


   First cleaning with air-pressure (6 bars) of each
   keying module in order to remove dust and others.

   Afterwards, clean with alcohol each contact and
   visually check them with a small mirror.




                                                                       Busbar anchor block


                                                         Part 1                                        23
KEYBOARDS                                 Restoring Hammond X-66


   CONTACTS & BUSBARS CLEANING


                                            Contacts of eack keying module have to be cleaned one
                                            by one exactly at that level.
                                            This operation takes a lot of time and is rather delicate
                                            but there is no other way.
                                            Patience is a must and perfect lighting is required.
                                            No rush, take it easy….




   Keying module




                                 Part 1                                                       24
KEYBOARDS                                                          Restoring Hammond X-66


   CONTACTS & BUSBARS CLEANING
                                                                     When Presets contacts are done, it's time now to clean
                                                                     the keys-contacts.
                                                                     There is no other alternative than cutting the wires
                                                                     connecting each busbar. Otherwise, it's impossible to
                                                                     remove the busbars out of the console.
                                                                     Be sure to take note of the initial position of each lead
                                                                     and busbar !




    Cut buss bars wires at that level.

    Similarly to Presets contacts, start by cleaning each busbar and contacts as done for the Presets ones.



                                                          Part 1                                                       25
KEYBOARDS                                                           Restoring Hammond X-66


   CONTACTS & BUSBARS CLEANING

   When completed re-install all busbars in their original position. This operation is not easy specially for the first ones.
                                  Be careful, you have no right to mistake for this operation !
   Re-solder each busbar lead and don't forget to isolate them with schrink tubes.
   The last action consists in re-installing the whole row of contacts in its initial position. Not easy at all. If you can be
   helped by two additional hands, don't hesitate to claim for help, you will save a lot of time (it took me half-a-day just
   to do this).
   Now, when all contacts are correctly re-positioned, start re-inserting each key as originally.                  Upper
   Keyboard is now completed




                                                           Part 1                                                      26
KEYBOARDS                                                       Restoring Hammond X-66


   CONTACTS & BUSBARS CLEANING

   The Lower keyboard is less accessible than the upper one and entails huge dismounting.
   So, I decided not to do it and find another way.

                                                         Based on B3's maintenance tips, bus anchor block located at
                                                         both ends of the keyboard were unscrewed.
                                                         Then gently move back and forth those buss anchor block
                                                         while depressing the keys at the same time, it is also possible to
                                                         get 'some ways' of refinding good contacts.
                                                         Upper and Lower keyboards are now completed.




                                                       Part 1                                                     27
KEYBOARDS                                                       Restoring Hammond X-66


   RE-INSTALLING KEYS

   To eliminate the lateral slack of keys, here again, the easiest way is to replace all the old key-combs by new ones.
   After several decades of operation, the paddings maintaining the keys in correct position are somewhat worn out and
   keys become 'clanky'.



                                                             A special small vice system has been handcrafted.     (refer to
                                                             Annex_1 for details).

                                                             The idea is to flatten out the rivet fixing the padding.
                                                             By doing so, the padding enlarges by about 0.5 mm on both
                                                             sides eliminating so this unpleasant lateral slack.
KEYBOARDS                                                         Restoring Hammond X-66


   RE-INSTALLING KEYS

   If the adjacent rivets are also tightened, lateral slack on the entire keyboard entirely disappears. Again it takes time but
   the improvement involved is really noticeable. If tightening of paddings is exagerated, it is easy to reduce the excess
   with a sandpaper lime.



                                                                         Before re-positioning each key, check the angle of
                                                                         the small clamp activating the contact bracket on
                                                                         each key module. This clamp should have the
                                                                         same angle. A dot of white grease is put on this
                                                                         portion of the clamp pushing the contact bracket.
PEDAL KEYBOARD                                                  Restoring Hammond X-66


   RENOVATING PEDAL KEYBOARD


   Pedal board was also in poor conditions and needed some actions. It is composed of two major elements:



        Pedal switch assembly, integral part of the
                         console.                                          Pedal keyboard, removable.


                                                                Before




                                                       Part 1                                               30
PEDAL KEYBOARD                                                    Restoring Hammond X-66


   RENOVATING PEDAL KEYBOARD


   1. Pedal switch assembly was in need of serious repairs.


                                                              Pedal strip had to be removed from the console. Several
                                                              switches were missing ! and no more foundable. By
                                                              chance, I found switches of Hammond R-100 series that
                                                              are compatible with some minor adaptations.




  All switches were dismounted, cleaned, realigned. The metal strip repainted and adequate insulation material re-
  installed. Beside finding the switches, no major problem.


                                                         Part 1                                                    31
PEDAL KEYBOARD                                                   Restoring Hammond X-66


   RENOVATING PEDAL KEYBOARD

   2. Pedal board was in an horrible state and had to be totally dismounted, each wooden part sanded, re-painting. Rust
   of springs removed with sanding machine. Mostly, wooden and mechanical works. Nothing really exciting indeed!




                                                                                          Pedal frame




         Repainting pedal keys




                                                        Part 1                                                   32
PEDAL KEYBOARD                                                    Restoring Hammond X-66


   RENOVATING PEDAL KEYBOARD

   2. Pedal board - Felt pads




                                                            Since the pedal keyboard is dismounted, it’s a good practice
                                                            to remove the original felt strips, clean and replace them in
                                                            the opposite way (flip vertical in computer jargon).




   Original felt pads avoiding lateral slacks of pedal keys were replaced by new ones (a must).




                                                         Part 1                                                    33
PEDAL KEYBOARD                                                   Restoring Hammond X-66


   RENOVATING PEDAL KEYBOARD
   Re-adjustment of tension springs is compulsory.
                                                 Re-install all pedal keys in their initial position and screw down with
     Locking                                     a locking ratchet to a position that pedal key stays « in balance »
     ratchet                                     between the rest position and the upper one.
                                                 At that moment, make a CW (*)rotation by one turn to restore
                                                 appropriate tension.
    One turn
    clockwise
                                                 3/4 turn will provide less tension while 11/2 turn will increase the
                                                 tension. It’s important to align all tension springs by the same
                                                 amount.
                                                 * Clockwise rotation




                               After

                                                        Part 1                                                     34
PEDAL KEYBOARD                                                    Restoring Hammond X-66


   RENOVATING PEDAL KEYBOARD

   Pedal board - Final




       All pedal switches are tested and resoldered as               Pedal keyboard completed and ready for use
                          original.



                                                         Part 1                                                   35
EXPRESSION PEDAL                                                 Restoring Hammond X-66


   EXPRESSION PEDAL

   Beside ‘grand’ cleaning, some improvements can be implemented on the expression pedal.
   This part can be removed quite easily from the console.




                                                                             Firstly, unscrew (2) and remove the photo
                                                                             cell adapter from the assembly and open it.
                                                                             Remove dust, foreign debris and start
                                                                             cleaning.




                                                        Part 1                                                       36
EXPRESSION PEDAL                                                 Restoring Hammond X-66


   EXPRESSION PEDAL


                                                                 Replace the light bulb.
                                                                 Use alcohol-soaked cotton buds to clean the photo cells
                                                                 thoroughly.
                                                                 Then, it’s a good opportunity to check each of the four
                                                                 photocells with ohmeter.




   In dark condition, the resistance should be in the range of 4.0 MΩ to 4.5 MΩ.
   In full lighting condition, the resistance value should drop in the range of 200 Ω to 400 Ω.




                                                        Part 1                                                     37
EXPRESSION PEDAL                                            Restoring Hammond X-66


   EXPRESSION PEDAL: Leslie motor speed control.
                                                   When playing, it’s more convenient to control Leslie
                                                   motor speed with the right foot than using the original
                                                   Leslie half-moon switches.
                                                   One micro-switch has been installed on a metal square
                                                   just to provide a short ‘pulse’ needed to reverse the
                                                   motor speed.
       Rear view                                   Full details of this control circuit will be provided in
                                                   Part 3.
                                                   This completes the expression pedal section.




       Front view

                                                   Part 1                                                     38
DRAWBARS                                                        Restoring Hammond X-66


   DRAWBARS Maintenance.
   Basically, X-66 drawbars are identical to other Hammond’ series. Nothing specific but some maintenance was
   needed since moisture, dust, oxydation… are really harmful to proper drawbars operation.




       Before                                                    Before



                                                       Part 1                                                   39
DRAWBARS                                                           Restoring Hammond X-66


   DRAWBARS Maintenance.
   To attain the drawbars, the tab control panel has to be removed (7 ) and flipped vertically in order to get
   proper access to the drawbars blocks.
   When laid down on the bench, then you realize the importance of removing all foreign debris, excesses of
   grease, oxydation, accumulation of dust.. Dismount and clean up with alcohol.




                      During cleaning                                                       After cleaning

                                                          Part 1                                                 40
DRAWBARS                                                                       Restoring Hammond X-66


   DRAWBARS Maintenance.
   Check for correct operation and 'feeling'.                             If needed, slightly bend the contact spring to
   render the proper excursion.
   Before remounting the drawbars, you like to see all the drawbar knobs in perfect horizontal alignment, then
   it's the right time also to check if all brass guide rods are straight.




           Fixation       Graduation
                                                                                                                                Bakelite
            screw          slide bar
                                                                        Brass guide rod                                         insulator
                                                                                                                                             Soldering
                                                                                                                                             point
                                            Thrust
                                                           Resistor                                                                  Nylon retainer
                                                                                             Spring contact
               Engraved                                                                                                Fixation screw with
                 knob                                                                                                  nylon washer

                                                Bus bars                                           Plastic enclosure

              Cut of Drawbar



                                                                      Part 1                                                                          41
DRAWBARS                                                                      Restoring Hammond X-66


   DRAWBARS Maintenance.
   Generally, a little curve is noticed at the level of the thrust. When completed, it is now time to grease again.
   One dot of grease is applied on each bus bar where the contacts are touching.
   In this case, special lubricant (*) was used but pure vaseline would do also the job.




                                       Lubricant



           Fixation       Graduation
                                                                                                                               Bakelite
            screw          slide bar
                                                                       Brass guide rod                                         insulator
                                                                                                                                            Soldering
                                                                                                                                            point
                                              Thrust
                                                          Resistor                                                                  Nylon retainer
                                                                                            Spring contact
               Engraved                                                                                               Fixation screw with
                 knob                                                                                                 nylon washer

                                               Bus bars                                           Plastic enclosure

              Cut of Drawbar

  (*) Tunerlub – Cat.26-01 – HF Lubricant made by GC Electronics (USA).

                                                                     Part 1                                                                          42
 DRAWBARS                                                          Restoring Hammond X-66


    DRAWBARS Maintenance.

                                        Soldering flow up to there                  Some tips to re-solder drawbars leads.
     Adequate soldering flow
                                                                                    - cut the end of the lead, strip it by about
                                                             Multi-wires            10mm, twist the wires and solder it
                                                             conductor
                                                                                    vertically.
                     Correct soldering             PVC Sheath                       - by doing so the solder will flow inside the
                                                                                    sheath and will so reinforce greatly the
    Insufficient      Lead breakage will take                                       whole mechanical strength.
     soldering        place exactly here.          PVC Sheath
       flow
                                                             Multi-wires
                                                             conductor


                      Incorrect soldering

The ultimate in luxury is to insert thermo-shrink tube.



                                                          Part 1                                                           43
DRAWBARS                                                           Restoring Hammond X-66


   DRAWBARS Maintenance.

    After cleaning




                                                                   After re-installation


   Re-install the drawbars blocks as original, re-solder the leads, confirm proper operation and feeling.
   Re-install the tab control panel.
   Drawbars maintenance is completed and look like fresh from factory !



                                                          Part 1                                            44
OUTLETS                                                         Restoring Hammond X-66


   OUTLETS
   The oulet receptacle has been reworked in order to comply more with EU safety regulations. 2-pin UL inlet and
   socket were removed. A new approved 3-pin inlet with earth connection was fixed. The original 2-pin socket to
   feed external device was also removed and replaced by a 6-pin socket.




                                                                After modification
      Before                                                    Rear view


                                                       Part 1                                                  45
OUTLETS                                                          Restoring Hammond X-66


   OUTLETS

   The oulet receptacle has been reworked in order
                                                         After
   to meet the EU safety regulations.
   2-pin UL inlet and socket were removed.
   A new EU approved 3-pin inlet with earth
   connection was fixed.
   The wiring diagram is provided on the next slide.


                                                         Front view

                                                       The original 2-pin socket to feed external devices was also
                                                       removed and replaced by a 6-pin socket for Leslie 147.




                                                        Part 1                                                       46
OUTLETS                                                                                    Restoring Hammond X-66


   OUTLETS


          Wiring diagram of X-66 outlet receptacle.

              TAB Voice       Tibia ‘A’                                                      230 Vac
                Chan.          Chan.                                                                                              Motor Speed
                     Reverb                                              Tibia ‘B’                                    to PSU      control signal
                                                                                                                                   + 8Vdc – Fast
                     Chan.                                                Chan.       GND                                           0Vdc - Slow       Audio
                                                                                                                                                      output to
                                                                                                             Chasis                                   Leslie 147
              BLU   VIO   WHT                                        RED             YEL                     ground                   GRY



                                                    WHT                                      YEL                                                    YEL
                                                                     RED                     BLU
                                                  VIO                                                                           BLU

                                                                                            C1                                            5
                                                                                                         N    Yel/                    4         6
                                    1     2                          1       2
                                  S2                                                                 G        Grn
                                7             3                 7 S1             3                                                        S3
                                                        BRN                                              L           Thermal          3         1
                                                                                           0,22µF                                                   Signal
                                                                                                          AC          fuse to             2
                                6                                                           275V
                                        5 4                      6       5   4
                                                                                                         Inlet                                      Ground
                                                                                                                       PSU
                                                                                                                                          N/C
                                                               YEL                                             BRN
                                                         BLU
             REAR VIEW                                                                                                                          REAR VIEW

                          X66 OUTLET RECEPTACLE
                                                                                           to Key-       to SSR
                                                                                           Switch


                                                                                 Part 1                                                                            47
OUTLETS                 Restoring Hammond X-66


   OUTLETS


             Since the rear panel was dismounted, 6 additional output
             sockets were incorporated to drive an external audio mixer.
             A small board was assuring the interface between the 4
             outputs from output stage of the X-66 console.
             The diagram of this interface board is provided here-after.




    After

               Part 1                                                      48
OUTLETS                                                                         Restoring Hammond X-66


   OUTLETS

  Schematic diagram of interface board between the console output and external audio mixer.                                        Same
  filter as found in TC-series.


                      INPUTS                                                                                             OUTPUTS
          From Drawbars ‘A’                                                                                                     Tibia ‘A’ Chan.


          From Drawbars ‘B’                                                                                                     Tibia ‘B’ Chan.


            From Tab Voice                                                                                                      Bright Chan.


               From Reverb                                                                                                      Reverb Chan.
                                                        120 K




                                                                          22 K                  22 K            22 K            Bass Chan.
                                      100 K



                                                100 K
                               47 K




                                                                                                                       330 nF
                                                                                           8.2 nF          8.2 nF
                                                                10 K




                                                                                     GND                                GND
                                                                                             Bass Filter

      From Leslie Preamp                                                                                                        Mono Chan.
                                              X-66 CONSOLE OUTPUTS TO EXTERNAL AUDIO MIXER




                                                                       Part 1                                                                  49
MECHANICAL                                                        Restoring Hammond X-66


   MECHANICAL WORKS

  Restoring also includes the mechanical part or the body of the organ. Moisture, dust, carelessness of the former
  owner entailed serious damages that did merit some actions.




                                                                          Bad luck, all chrome sleeves exhibited severe
                                                                          rust stains.
                                                                          No other choice to dismount those tubes and
                                                                          send them outside for chrome-plating
                                                                          process.




                                                         Part 1                                                       50
MECHANICAL                               Restoring Hammond X-66


   MECHANICAL WORKS

                                                              No other choice than to remove cabling
                                                              between the upper section and the base
                                                              in order to separate them later on in
                                                              two apart units.
                                                                                          Easier to
                                                              say than to do !




   Here is the X-33 console !

                                Part 1                                                        51
MECHANICAL                     Restoring Hammond X-66


   MECHANICAL WORKS


                           All the mechanical parts composing the base unit were
                           so dismounted, cleaned and entirely re-painted. Not really
                           funny!




                           Original pedal lighting has been replaced by new
                           ‘economic’ lamps providing a wide-angle lighting, long-life
                           and no heat dissipation inside the console.




                      Part 1                                                   52
MECHANICAL                     Restoring Hammond X-66


   MECHANICAL WORKS

                      Upon receipt the chrome sleeves, the base has been re-mounted
                      and upper and base units re-assembled.
                      Afterwards, re-cabling was done as initially.
                      Similar treatment was applied to the bench (re-chroming the
                      tubes).
                      Removable wooden panels were also entirely refurbished by a
                      cabinet-maker.
                      The mechanical part is now completed.




                      Part 1                                                  53

				
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