Filter
Top Products
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
TROUBLESHOOTING & REPAIR
F-53
SCR HEAT SINK
INSTALLATION
NOTE: Upon reassembly, apply a thin
layer of Lincoln E1868 (Dow Corning
#340) heat sink compound to all bolted
electrical connections on the aluminum
heat sinks, including positive buss bar.
1. Slide a new SCR assembly onto the
mounting studs.
2. Carefully attach the positive buss
bar onto the heat sink which had
been removed. If it had been nec-
essary to remove the buss bar,
replace it at this time.
3. Align snubber assembly in position
on SCR output bridge assembly.
4. Using a 9/16” wrench, secure the
SCR output bridge and snubber
assemblies with two nuts, flat wash-
ers, and lock washers.
5. Using a 5/16 (8mm) nut driver or flat
head screw driver, attach snubber
assembly ground wire with screws
previously removed.
SCR OUTPUT BRIDGE
INSTALLATION
NOTE: Upon reassembly, apply a thin
layer of Lincoln E1868 (Dow Corning
#340) heat sink compound to all bolted
electrical connections on the aluminum
heat sinks.
1. Support the SCR bridge assembly
with a lift hook or rope.
2. Clear all leads and carefully posi-
tion the SCR bridge assembly in
place.
3. Place insulators between SCR
bridge assembly and the output
rectifier mounting bracket. See
Figure F.23. Check for electrical
isolation with an analog ohmmeter.
Minimum acceptable resistance to
ground is 500,000 ohms.
4. With the 5/16” socket wrench,
attach bottom six screws securing
the front panel assembly to the
base. Carefully push the front panel
rearward into position.
5. Attach resistor R2 to the unit using
a 7/16” wrench Secure leads #217
and #222 to resistor R2.
6. Using a 1/2” socket wrench, attach
the four screws (2 on each side)
holding the transformer side panels
and SCR assembly rails to the main
transformer.
SCR OUTPUT BRIDGE REPLACEMENT
IDEALARC DC-1000
F-53