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F-56 F-56
TROUBLESHOOTING & REPAIR
MULTI-SOURCE
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SCR BRIDGE / HEAT SINK ASSEMBLY REPLACEMENT PROCEDURE
13. Clear all leads and carefully maneuver
SCR bridge out of the right side of the
machine.
NOTE: Upon reassembly, apply a thin layer of
Lincoln Electric T12837 (Dow Corning
340) heat sink compound to all bolted
electrical connections on the alu-
minum heat sinks.
UPON REASSEMBLY, THE SCR BRIDGE
ASSEMBLY MUST BE ELECTRICALLY
ISOLATED FROM GROUND. MINIMUM
ACCEPTABLE RESISTANCE TO GROUND
IS 500K OHMS.
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FIGURE F.28. Mounting Bolt
J1
J2
J3
J5
J6
J8
Firing Board
Control Board
J4
J7
Mounting Bolt
CAUTION