GPS 8500/GPS 9700 Troubleshooting Voltage Issues
wc_tx000828gb.fm 25
3.7 Checking the Diode Rectifier
Prerequisites
Generator shut down
Multimeter
Procedure
Follow the procedure below to check the diode rectifier.
1. Shut down the generator.
2. Remove the rear panel from the generator.
3. Mark, then disconnect the wires from the diode rectifier (a).
4. Using the diode scale on the multimeter, check the continuity of the diode
rectifier. Check:
F1 to Z2, F1 to F2, F1 to Z3
F2 to Z3, F2 to F1, F2 to Z2
Z2 to F2, Z2 to Z3, Z2 to F1
Z3 to F1, Z3 to Z2, Z3 to F2.
5. Reverse the leads and check again.
Note: For each check, the multimeter should read approximately 0.5V in one direc-
tion and “OPEN” in the other.
Does the diode rectifier perform as stated above?
The diode rectifier has now been checked. Continue troubleshooting by checking
the auxiliary winding.
Yes ____ No ____
The diode rectifier is OK. The diode rectifier has failed; replace it.
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