No 24VAC (B Voltage)
Is the machine
equipped with an
expansion board?
(A)
Is there 100-120VAC
between H12-1 and
H12-2 on AP1
No
See expansion board
troubleshooting info.
Yes
(C)
Is there 100-120VAC
between the two black
wires leaving TR3
(24VAC supply
transformer)?
Yes
(B)
Verify fuses F1 and
F2 on AP1 are good.
Replace if needed.
No
(D)
Is there 24 VAC
between the red and
white wire leaving
TR3?
Yes
Verify connections
and wiring between
TR3 and AP1 are good.
No
Inspect and replace
after market items as
needed.
Yes
Replace TR3.
No
Troubleshooting
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