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Very good manual, in depth and complete. Only criticism is that some of the circuit diagrams are slightly blurry and hard to follow for long periods of time, but this is to be expected. Perfect for any maintenance required. Also contains the wiring diagrams of the control cable for constructing extensions.
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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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5-1 Troubleshooting (GY15MS*)
Notes: 1. Before troubleshooting, setup the PC�s display as below. � Resolution: 1024 x 768 � H-frequency: 61 kHz � V-frequency: 75 Hz 2. If no picture appears, make sure the power cord is correctly connected. 3. Check the following circuits. � No raster appears: Stand PCB, Main PCB � 14V develop but no screen: Main PCB � 14V does not develop: Main PCB 4. If you push and hold the Exit for more than 5 seconds, the monitor automatically turns back to the factory preset.
5-1-1 No Power
Does proper DC 14V appear at DC jack and Pin 1 of CN201? Yes Does proper DC 5V, DC 3.3V appear at Pin 2 of IC201, and Pin 3 of IC202? Yes Does proper DC 1.8V appear at Pin 4 of IC204? Yes Does proper 5.0V appear at Pin 5, 6 of IC401 and Pin 7, 8 of IC401? (DC 3.3V (DPMS_ON Pin 2 and 4 (OFF_SW) of IC401 must be low level) Yes Check IC402. No No Check IC204 and related circuit. No Check IC201, IC202 and related circuit. No Check signal cable and power adaptor and CN201.
Check IC401, IC114 and related circuit.
GY15MS*/GY17MS*
5-1
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