Perkins 1104E Series Troubleshooting Manual page 202

202
Troubleshooting Section
E. Turn the keyswitch to the ON position. Monitor
the status screen on the electronic service tool.
Slowly connect and disconnect the jumper wire.
Expected Result:
When the jumper wire is disconnected the switch
should be in the OPEN position. When the jumper
wire is connected the switch should be in the
CLOSED position.
Results:
•
OK
Repair: Verify that the jumper wire has been
removed. The suspect mode selector switch is
faulty. Replace the switch and verify that the repair
has eliminated the problem.
STOP.
•
Not OK – Proceed to Test Step 4.
Test Step 4. Measure the Resistance at
the P20/J20 MIC
Illustration 114
A. Turn the keyswitch to the OFF position.
B. Reconnect the suspect switch.
C. Disconnect the P20 connector from the J20 MIC.
D. Measure the resistance between P20:37 switch
return and the following MIC pins:
•
P20:30 Switch No. 1
RENR2696-01
g00955199