LSCA-3 Installation

 

Although this page may seem confusing or complex, the work itself is really no more difficult than replacing stock Amphenols.

It's possible that my way of writing instructions makes it seem like a real difficult project. 

If so, I apologize.  I need to improve my writing skills.  

I've done this so many times, that it's actually much easier than replacing Amphenols.

 

Consider these facts: each CONNECTOR (both Hammond and Leslie) has a total of nine (9) wires. 

The wires are tightly twisted into separate color-coded HARNESSES. 

The HARNESSES are also labeled, so you CAN'T make a mistake.

 

In most cases, the CONNECTORS are prewired. (see below)

Two (2) connectors, one on the Hammond, one on the Leslie, equal a GRAND TOTAL of eighteen (18) wires to connect. 

This is even easier than removing the AO-28 preamp from a Hammond.

 

Let's dispense with the confusion. 

Let's break down WHAT you need to connect:

Three (3) wires for the organ signal output.

Two (2) wires for 110 volts to power the Leslie amp.

Four (4) wires for the Leslie motors. (and four (4) wires from the Leslie hand switch)

That's it!

The first time you tackle this project, you'll realize - you're making progress - it's getting easier and easier.

Take your time, read carefully, check your work constantly - and relax.

Hammond Console Installation:

Note:  Disconnect organ power before beginning.

(a)     Mount the Hammond chassis connector.  An AMP-CPC 9 conductor Hammond chassis connector, complete with three labeled 72" wiring harnesses, (referred to as SIGNAL HARNESS, VOLTAGE HARNESS, and MOTOR HARNESS), is included with your LSCA-3 kit.

SIGNAL HARNESS - brown, black, and red wires

VOLTAGE HARNESS - blue and grey wires

MOTOR HARNESS - white/white and brown/brown wires

Mount this connector in the Hammond chassis outlet box.  Stainless hardware is included.  Two holes must be drilled per chassis connector.  Route the 3 harnesses up through the tube (the tube without the pedal wires is preferred) into the case of the organ.  For installations other than B3/C3 type chassis outlet box, you'll have to fabricate or buy a secure mount for this connector.  The harnesses supplied are much longer than necessary.  You can remove any excess, once you've decided exactly where the wires will be routed. 

NOTE!  For multiple Leslie installations, the prewired AMP-CPC 9 conductor Hammond chassis connector harness pins cannot be inserted into the chassis connectors until after the connectors are securely mounted, because the wiring is connected behind the connectors.  (This is exactly the same as multiple Amphenols.)  You must carefully insert the pins into the connectors after they have been mounted on the chassis.  Please refer to the LSCA-3 wiring chart (below) for the color codes and pin numbers before inserting any pins into the connectors.

THIS IS CRITICAL.   

(b)     Provide 110v to the LSCA-3 box.  The blue and grey wires coming from the LSCA-3 box connect to a switched 110v source - either the blue/grey terminals on the AO28 preamp, or the (preferred) terminals on the left side of the generator.  At the same time, connect the blue and grey wires, which come from the AMP-CPC 9 conductor Hammond chassis connector (VOLTAGE HARNESS) to the same 110v source.  Reminder: this is switched 110 volts.  110 volts present when organ is turned on.

(c)     Connect the 3 position hand switch cable to the LSCA-3 box, at the terminals labeled "Chorale SWITCH Tremolo".  White and white connect to the Chorale terminals, brown and brown connect to the Tremolo terminals.  Install the 3 position hand switch into your existing halfmoon switch case, or install using your choice of alternate mounting options.

(d)     Connect the following 4 wires from the AMP-CPC 9 conductor Hammond chassis connector (MOTOR HARNESS) to the LSCA-3 box at the terminals labeled "Slow MOTOR Fast".  White and white wires connect to the "SLOW" terminals, brown and brown wires connect to the "FAST" terminals.  You can now remove the cover and mount the LSCA-3 box to the shelf of the Hammond, using 3/4" wood screws and flat washers.  Replace the cover.

(e)     Finally, remove all existing wiring from the signal terminals of the AO28 preamp, and solder the red, black, and brown wires from the AMP-CPC 9 conductor Hammond chassis connector (SIGNAL HARNESS) directly to the AO28 signal terminals, at terminals G  G and BRN.

This  This completes the LSCA-3 installation at the Hammond console end 

Leslie Amp Installation:

(please refer to and print the LSCA-3 wiring chart below)

(a)     Remove existing 6c Amphenol connector from the Leslie amp.  Carefully MARK each of these connections.  MARKING EXISTING WIRES IS CRITICALLY IMPORTANT.  Just one small error can wreck your whole day, and probably damage your equipment, too.

Replace the Amphenol with the prewired AMP-CPC 9 conductor Leslie chassis connector included with the LSCA-3 kit.  Stainless hardware is supplied.  This connector has 12" wiring harnesses.  The existing mounting holes may have to be filed very slightly.  Please refer to the wiring chart found below, and follow the coding exactly.  Observe professional quality wiring practice, and solder very carefully.  Use heat shrink to insulate all connections.   

(b)     Select the option for motor wiring:

(1)  wire motors to the existing motor plugs

(2)  mount a new, prewired AMP-CPC 4 conductor motor connector for motor wiring, if you ordered one with your LSCA-3.  If not, one can be installed anytime.

(3)  mount a standard quad electrical outlet box (inside the bass compartment) with one white socket and one brown socket, and just plug the motors into the proper color outlets after wiring the outlets properly.  This should be self-explanatory.

If your option is (1), remove all existing motor wiring from the sockets.  Once all wiring is removed, the brown wires from the AMP-CPC 9 conductor Leslie chassis connector will be soldered to the FAST motor outlets, and the white wires will be soldered to the SLOW motor outlets. 

If your option is (2), mount the prewired AMP-CPC 4 conductor motor connector on the Leslie amp.  Stainless hardware is supplied.  Two small holes must be drilled to mount the connector.  (See "Additional notes", below.)  Solder the brown wires to the brown wires from the AMP-CPC 9 conductor Leslie chassis connector, repeat for the white wires.  Trim the wires as needed before soldering, and use heat shrink to insulate.  Run the white/brown motor harness inside the Leslie bass compartment and connect both upper and lower slow motors to the white leads.  Connect both upper and lower fast motors to the brown leads.  Insulate these connections as appropriate.  

This completes the LSCA-3 installation at the Leslie amp end   

Wiring Chart for LSCA-3 Installation

As reference, original 122 type (balanced) Leslies use the following pin connections:

Amphenol pin (1) – signal - BLACK

Amphenol pin (2) – ground - YELLOW

Amphenol pin (3) - 110v - GREY

Amphenol pin (4) - 110v - BLUE

Amphenol pin (5) - B+ - BROWN

Amphenol pin (6) – signal - RED

As reference, original 147 type (unbalanced) Leslies use the following pin connections:

Amphenol pin (1) – signal - BLACK

Amphenol pin (2) - motor switching - YELLOW

Amphenol pin (3) - 110v - GREY

Amphenol pin (4) - 110v - BLUE

Amphenol pin (5) - motor switching - BROWN

Amphenol pin (6) – signal - RED

LSCA-3 uses the following pin connections - please print this:

AMP-CPC pin (1) RED - organ signal + (high)

AMP-CPC pin (2) BLACK - organ signal - (low)

AMP-CPC pin (3) BROWN - organ signal - chassis ground

AMP-CPC pin (4) BLUE - 110v

AMP-CPC pin (5) GREY - 110v

AMP-CPC pin (6) WHITE - slow motors

AMP-CPC pin (7) WHITE - slow motors

AMP-CPC pin (8) BROWN - fast motors

AMP-CPC pin (9) BROWN - fast motors

Original motor switching connections can be removed from the Leslie amp. 

NOTICE!

The SIGNAL harness on both AMP-CPC 9 conductor chassis connectors provides 3 wire connection for balanced Leslies or other amplifiers.  For unbalanced Leslies, or other unbalanced applications, connect only the BROWN (chassis ground) and the RED (signal high) wires inside the Leslie amp.  Connect all three signal wires at the Hammond end, as instructed above. 

For unbalanced Leslies or other applications, do not connect the AMP-CPC 9 conductor Leslie chassis connector pin 2 (black, organ signal low), just use heat shrink to insulate it. 

This completes the installation of the LSCA-3

Additional Notes:

Because the LSCA-3 does not use the Leslie switching circuitry, the second 12AU7 tube (closer to the center of the amp chassis), socket, and all associated wiring may be removed from the amplifier.  Also, the original relay and all of its wiring may be removed, as well as the small 5 pin "brake" socket.  If you ordered the AMP-CPC 4 connector (for motors) it will fit perfectly in the hole previously used by the extra 12AU7 (switching) tube.  This hole is also available on 147 style amplifiers - it is covered with a pop out plug.

See photos here and here.  Other photos are also located on this website - just look around.

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