PART #5: FINISHING THE PCB (Trimmers, pots and wire)
You will now solder in the remaining parts on the pcb in preparation for wiring to the front
panel. USE THE NO-CLEAN SOLDER. BE CAREFUL!
Locate the 2K blue trim pot. It will have “P 202” marked on one side. Solder into
TP1 (labeled Q TRIM).
Locate the 20K trim pot. It will have “P 203” marked on one side. Solder into TP2
(labeled CV OFFSET).
Locate the Spectrol pots (3). IMPORTANT: in order for the pc board to properly
align with the front panel, each pot must be absolutely flat on the pc board, with
the shafts pointing away from the pc board. These are marked on the top side as
71104. Solder these pots into VR1, VR2 and VR3. Remove the outer pot nut and the
flat washer. The rear pot nut should be tightened all the way back, then rotated ¼
turn looser. This allows the stress of mounting to be on the threads of the bushing,
not pressing against the pot body itself.
Locate
the
WIRE bag. The MOTM-485 has lots of wires: be very careful when
soldering to the pc board in order that the wire colors are correctly into the proper
holes.
The long coax wire solders into J4. A tie-wrap is used on each wire to secure the coax
flat onto the pc board. Note that the coax wires have one end stripped back shorter
than the other: the short end solders to the pc board. See the photo below for details
(this is a generic photo!)
Solder the 2 short coax cables into locations J5 and J6. Secure with tie-wrap.
Solder the long white/black twisted wire into J3. White into 1, Black into 2.
Solder the orange/white twisted wire into J1. White into 1 and Orange into 2.
SYNTHESIS TECHNOLOGY
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9
MOTM-485 ASSEMBLY 8/11/05
WWW.SYNTHTECH.COM
Summary of Contents for MOTM-485 GX-1 Diode VCF
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