Matsushita Electric KM40108849C3, Service Manual

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14. TROUBLE SHOOTING GUIDE
14.1. Service Hints
SYMPTOM CURE
Dead Check IC801, X801, X802
Can’t hear the voice from handset. Check Q109, Q405, Q406.
No voice transmit. Check Q421, Q424, Q108.
Can’t tone dial. Check IC801, R921, R922, R923 and
C923.
Can’t pulse dial Check Q101, Q103, Q104.
Can’t auto redial Check IC201, Q201.
No rings. Check D1, IC1 and Q1.
can’t speak with the speakerphone. Check IC601.
Can’t hold. Check Q107.
Can’t speak with the handset. Check handset jack
Can’t speak with the headset. Check headset jack
Can’t change the volume for
speakerphone. Check IC801, IC601
Can’t change the volume for handset. Check IC801, Q405
No volume handset or speakerphone. Check IC801, Q108, Q401.
14.2. Pulse Dialing Problems
14.3. Tone Dialing Problems (Hnadset)
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