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Detailed SONY CFD980 Service Manual at an easy to find one stop shopping. Make my radio hobby technically interesting. Thanks.
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Very complete shop manual. It contains everything needed to troubleshoot bascially any problem. Instructions, diagrams, schmeatics, illustrations... it's all there. Highly recommended!
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6. Voice cannot be transmitted to other party (outgoing call).
Check the handset MIC sensitivity. OK Check the handset TX AF circuit (around Pins 17, 19~21 of IC504). NG At the MIC of the handset, does the bias voltage exist? OK Check the base RX TEL-line out. OK NG In the base, with the SG standard modulation of 1kHz 3kHz deviation and input signal of 1mV, can the sine wave be seen at Pin 25 of IC1? OK NG NG Check R548, R534, R532 and C555.
Check the base IF circuit (around Pins 26~29 of IC1).
Then, can the sine wave be seen at Pin 24 of IC1? OK Then, can the sine wave be seen at the Q2 collector? OK Check the sorrounding circuit of T1.
NG
Check circuit around Pin 24 of IC1.
NG
Check Q2 and the sorrounding circuit of Q2.
Check the base RX sensitivity. OK The handset MIC is defective.
NG
Check the base RX TEL-line out. OK Check RX RF and mixer circuit of the base (around Q1) as well as FT3 and FT2.
NG
� 17 �
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