9.
INTERCOM KEYING.
a. Situation 3. When performing EPC step 2a (Intercom Keying and Talk/
Listen from INT JACK), the symptom in Figure 33 is observed. This symptom
indicates a bad intercom keying circuit, caused by an open circuit.
Troubleshooting technique for this defect is voltage checks.
Figure 33.
No intercom keying, EPC step 2.
35
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