Crumar Orchestrator, Multiman S, Multiman S2, Elka Rhapsody 610 Installation manual Vitalka Custom
Welcome to the metric system zone. Here we work with precision things and all dimensions are metric. 1" = 25.4mm. And yes, you need schematic reading skills.
Installation:
Select the right place to mount the LED, DIN5 MIDI connector and button on your synth (on the back panel near jacks for example). PCB can be mounted under the keyboard on the left side.
Drill holes and try to mount it before soldering wires.
Learn button, DIN5 Connector and LED can be placed here:

Drill dimensions:
For PCB drill holes 3.5mm.
MIDI jack (DIN5) = 18mm.
LED holder = 6mm.
Push button = 12.5-13mm.
Be careful with drilling hole for button, it have so small range to get hole too big.

Board dimensions and distance between screws:
Dimensions 105x90mm. Height 14mm with inserted connectors.
Holes diameter 3.5mm. Distance between holes 94x78mm.
Do not allow the board to bend, it can break the board.
All ribbon cables are 90cm. long, enough for placing all connections and you can cut extra length.
Panic button is not included in the kit. In case of panic - enough turn off and turn on the synth. If you prefer to install it part number is E-Switch RP3502MABLK
The next picture shows the pinout for 8 wire ribbon cable and pin number of wires:



V+(wire 7) to +15V at the power supply. GND (wire 8) to GND:


Elka Rhapsody 610 power supply connections:

This picture shown first(1) pin/wire on all connectors:
Upper connectors - PIANO
Down connectors - STRINGS

Board pinout and MIDI note:
All next wire should be connected to each key contact or to the main board
Pinout is same for both group of connectors. Only upper connector ribbon cable wire №14 should be connected to V+ rail.

Trigger boards have the same sequence as keys on the keyboard.
Here are variants of points for soldering PIANO and STRINGS wires:



Elka Rhapsody 610 notes pinout connections:

Place board on the next location:
All ribbon cables have length for placing PCB here.

One small important thing - use hot glue to fix inserted connectors to protect from disconnecting them during vibration when you ride on tour. Also fix wires strong. Do not leave them holding only on soldering joints.
Process for set MIDI channel: User operations
Stop all MIDI traffic.
To teach with which MIDI channel synth will work - push the black button (LEARN) LED will blink two times and stay ON to wait for MIDI messages at one of 16 channels. He will in OMNY mode.
Send any note on the MIDI channel which you want for this synth.
When the synth receives MIDI messages, LED will blink five times and turn OFF. It indicates that channel was received and saved. Then will ON with every NOTE ON messages on the selected channel.
Now the channel saved to memory and will never change before you push LEARN button again and starts settings process again.