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(29) Clean the flux from the rear of the circuit board with isopropyl alcohol and Q-tips
and then inspect each solder connection using a magnifying glass. Pay particular attention
to the grounds on the LEDs and switches; make sure solder has flowed onto the circuit
board groundplane and isn’t beading up on the pad.
(30) Set aside the completed front panel assembly. Note that Header H302 is unused, and
that no wires are soldered yet to the two speaker holes labeled “O” and “P” in the upper
left of the board.
IV. Main Circuit Board Assembly
Identify the main circuit board, pictured below, and collect all of the components in the
following list. (Refer to the master parts list for additional details about each component.) Note
that all components will install on the
top
side of the circuit board.
Main Circuit Board Components
C101
0.1
µ
F
Capacitor 50V epoxy dipped ceramic, qty 1
D101–D107, D109
1N4005
1A/600PIV diode, qty 8
F101
Fuse Clips
PCB mount fuse clips, qty 2
F101
Fuse
Fuse 1Amp 3AG, qty 1
J101-J104
Connector
Molex 0.156” 12-pin top-entry female header, qty 4
J101-J104
Header
Molex 0.156” 12 pin male header, qty 4
J105, J106
Connector
Molex 0.156” 4-pin top-entry female header, qty 2
J105-J106
Header
Molex 0.156” 4 pin male header, qty 2
J107
Connector
2.5mm DC pwr jack, PCB side entry, qty 1
J108, J109
Connector
D-Sub 25 pin male, PCB side entry, qty 2
J110
Connector
D-Sub 9 pin female, PCB side entry, qty 1
J111
Connector
DIN 5 pin female PCB side-entry, qty 1
J112
Connector
RJ45 8pin PCB side-entry, qty 1
K101–K113
Relay
P&B/Tyco V23105, DPDT, qty 13
K114
SS Relay
Clare Optomos PLA140 solid state relay, qty 1
P101, P103
Connector
Molex 26 pin (2x13), 0.100” male header, qty 2
P102
Connector
Molex 4-pin 0.156” PCB male w/locking clip, qty 1
Q101
2N3906 PNP gen purpose transistor, qty 1
R102, R103
2.2 K
Ω
Resistor, 5% carbon film, 1/4 W (red-red-red), qty 2
R104, R105, R106
1000
Ω
Resistor, 5% carbon film 1/4W (brown-black-red), qty 3
∗∗∗∗∗∗
Parts for optional amp relay keying circuit (delete K114, R106 if used)
∗∗∗∗∗∗
(R101)
4.7 K
Ω
Resistor, 5% carbon film 1/4W (yellow-violet-red), qty 1
(D108)
1N4005
1A diode, qty 1
(Q102)
IRF610PBF MOSFET power transistor, qty 1