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TROUBLESHOOTING & REPAIR | ||
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STATIC SCR TEST
FIGURE F.13 - SCR Heat Sink Assembly Test Points.
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3.Remove the red insulating paint from heat sink test points. See Figure 13.
NOTE: DO NOT DISASSEMBLE THE HEAT SINKS.
4.Using an analog ohmmeter, test the resistance from anode to cathode of SCR 1. Reverse the meter leads and check from cathode to anode of SCR 1. (R x 1000 SCALE)
a.If a low resistance is indicat- ed in either direction, dis- connect the snubber circuit (See wiring diagram) and retest SCR 1. If a low resis- tance is still indicated, SCR 1 is faulty - Replace. If a very high or infinite resis- tance is indicated without the snubber circuit, then replace the snubber circuit, See Figure F.14.
