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TROUBLESHOOTING & REPAIR
OUTPUT SHUNT/WELDING FEEDBACK TEST (continued)
FIGURE F.16 - SHUNT AMPLIFIER BOARD LOCATION
1
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1. SHUNT AMPLIFIER BOARD
TEST PROCEDURE
1.Remove main input supply power to the machine.
2.With the 3/8" nut driver, remove the 4 screws that hold the handle to the machine.
3.Remove the rubber gasket (cover seal) from the lift bail.
4.With the 5/16" nut driver, remove the sheet metal screws from the case top.
5.With the 5/16" nut driver, remove the screws holding the right and left case sides. Remove the case sides by lifting up and out.
6.Perform the Capacitor Discharge Procedure described earlier in this section of the manual.
WARNING
Before continuing with the test procedure, perform the capacitor discharge proce- dure to avoid electric shock.
7.After you have completed the capacitor dis- charge procedure for all four switch boards, locate plug J50 at the shunt amplifier board. Locate the plug and insert your voltmeter positive (+) probe into pin 3 and negative probe
8.Turn supply power to the machine ON.
