GPS 8500/GPS 9700 Troubleshooting Voltage Issues
wc_tx000828gb.fm 27
3.9 Checking the Choke
Prerequisites
Generator shut down
Multimeter
Procedure
Follow the procedure below to check the choke.
1. Shut down the generator.
2. Remove the rear panel from the generator.
3. Remove the wires from terminals Z2 and Z3 of the diode rectifier (a).
4. Measure the resistance between the wire connected to Z3 and Z1 on the choke
(b).
Is 7.6–8.1 Ohms measured?
5. Check if the choke is shorted to ground by the checking continuity (O.1–1.0
Ohms) between terminal Z3 and ground. Also check continuity between
terminal Z1 and ground.
Is there continuity?
The choke has now been checked. Continue troubleshooting by checking the
transformer.
Yes ____ No ____
Continue. The choke has failed. Replace the choke.
Yes ____ No ____
The choke has failed. Replace the choke. The choke is OK.
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