V300-PRO
TROUBLESHOOTING & REPAIR
4. Locate the Auxiliary Transformer T1 and leads used
for test. See Figure F.21.
5. Turn main power ON.
6. Test Auxiliary Transformer voltage for 24 VAC
between leads 503 and 212D. See Figure F.21.
a. If 24 VAC is present, transformer is OK. Go to
step 7.
b. If 0 VAC is present, test input voltage to Auxiliary
Transformer.
c. If input voltage to Auxiliary Transfor-mer is cor-
rect, replace Auxiliary Transformer.
d. If input voltage to Auxiliary Transfor-mer is not
correct, check Line Switch S12 and connecting
leads.
7. Check that Output Terminal Switch S4 is in the ON
position (closed).
8. Test for 24 VAC between leads 223A and 210.
a. If 24 VAC is present, then AC Trigger Circuit is
functioning normally.
b. If 0 VAC is present, check Choke Thermostat
and Fan Thermostat.
F-45 F-45
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THERMAL PROTECTION AC TRIGGER CIRCUIT (cont.)
FIGURE F.21 - THERMAL PROTECTION AC TRIGGER CIRCUIT
