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PRECISION TIG 185
TROUBLESHOOTING & REPAIR
F-23 F-23
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3. Using an analog ohmmeter test the
resistance from anode to cathode of
SCR1. Reverse the meter leads and
check from cathode to anode of
SCR1. See Figure F.4. If a low resis-
tance is indicated in either direction
SCR1 is faulty. Replace SCR Bridge
Assembly. See SCR Bridge
Assembly Removal and
Replacement.
4. Repeat Step #3 testing SCR2, SCR3
and SCR4.
5. The further check the SCR’s func-
tions use an SCR tester and proceed
to the Active SCR Test.
STATIC SCR TEST (continued)
SCR1 ANODE
SCR1 CATHODE/SCR2 ANODE
SCR2 CATHODE
SCR3 CATHODE
SCR4 ANODE
SCR3 ANODE/SCR4 CATHODE
FIGURE F.4 SCR TEST POINTS