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6. If any of the resistance checks are not correct, the
output power board is faulty. Replace. See the
Output Power Board Removal and Replacement
Procedure. Note: Use D30 test point for boards
G3326-2,3.
7. If the output power board “passes” the resistance
test, the power diode and transistor portion of the
board is good. However, other circuits on the
power board may be faulty. These circuits are NOT
readily tested or serviceable.
8. Reconnect the leads and plugs previously
removed.
TROUBLESHOOTING & REPAIR
F-26 F-26
PRO-CUT 55
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TABLE F.4 - OUTPUT POWER BOARD RESISTANCE
CIRCUIT OR
TEST POINTS COMPONENT(S) EXPECTED RESISTANCE
BEING TESTED
+Probe J33-Pin4 Diode A1 Less than
to and 100 ohms
–Probe Terminal B11 associated trace
+Probe Terminal B11 Diode A1 Greater than
to and 1000 ohms
–Probe J33-Pin4 associated trace
+Probe J33-Pin4 Diode A1 Less than
to and 100 ohms
–Probe Terminal B12 associated trace
+Probe Terminal B12 Diode A1 Greater than
to and 1000 ohms
–Probe J33-Pin4 associated trace
or D30
+Probe R5 Test Point Diode A2 Less than
to and 100 ohms
–Probe Terminal B1 associated trace
+Probe Terminal B1 Diode A2 Greater than
to and 1000 ohms
–Probe R5 Test Point associated trace
or
–Probe D30 Test Point
or D30
+Probe R5 Test Point Diode A2 Less than
to and 100 ohms
-Probe Terminal B2 associated trace
+Probe Terminal B2 Diode A2 Greater than
to and 1000 ohms
–Probe R5 Test Point associated trace
or
–Probe D30 Test Point
+Probe R5 Test Point Transistor A2 Less than
to and 100 ohms
–Probe J32-Pin14 associated trace
+Probe J32-Pin14 Transistor A2 Greater than
to and 1000 ohms
–Probe R5 Test Point associated trace
or
–Probe D30 Test Point
OUTPUT POWER BOARD RESISTANCE TEST (continued)