Sri 8610C User manual

Capacitor installation on 8610C and 301C GC
Remove the 6 Phillips head
screws from around the bottom of
the GC.
Remove the two Phillips head
screws and rubber bumpers from
the top front edge of the GC.
Remove the 8 hex head ( 5/64th )
screws from around the front
panel.
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Capacitor installation on 8610C and 301C GC
Lift the front panel away to provide
better access to the amplifier
board. You do NOT need to dis-
connect any wires.
Remove the two brass thumb-
screws which hold the metal shield
on the amp board. The thumb-
screws will be tight so you will
need a pliers to turn them.
Remove the 8 hex head screws
holding the amplifier board and
A/D board
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Capacitor installation on 8610C and 301C GC
Remove the BNC connectors.
Use a 9/16” wrench to loosen and
remove the nuts holding the BNC
jacks.
It’s a tight fit, but now you can wig-
gle the amp board and A/D board
out of the GC. You do NOT have
to remove any wires.
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Capacitor installation on 8610C and 301C GC
Locate the holes into which the ca-
pacitors will be soldered. The lo-
cations are labeled C1, C2 and
C3.
C1 is the high gain position and
should have a 100 picofarad poly-
styrene capacitor
C2 is the low gain and needs
a .01uf cap.
C3 is the medium gain and needs
a 1000 picofarad cap.
Cut the legs of the caps to about 1
inch long, so the legs will not pro-
trude too far on the other side of
the board.
Solder the caps in place using the
minimum amount of solder and
flux. Flux can create leakage
paths along the board surface, so
try to keep the solder and flux con-
fined to the area just around the
hole. Do not clean the board after-
wards, it will just spread the flux
around. Also the flux remover can
melt the polystyrene caps.
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Capacitor installation on 8610C and 301C GC
If the legs of the capacitors pro-
trude too far they will contact the
metal shield on the back side of
the amp board. If this happens,
just remove the shield and trim the
legs flush with the surface of the
board.
Re-assemble the boards in re-
verse order to the dis-assembly.
You may have to wiggle the
boards back into position being
careful not to force things. There
are many wires in the vicinity
which you just have to push aside
while you jockey the boards into
position.
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