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Tuner Diagnosis
The RF / CTV signal is transmitted to the Tuner of the Main Board. If the signal is not received, check the following items.
- Power supply: 5V, 33V
- Check for RF defects: Check the IF output
- Check for AUDIO defect: Check the SIF Signal output
Micom Diagnosis
VSP/MSP/DRX Block ETC
- Power supply: 3.3V, 5V, 8V
- Check for input defects: Y/C(CVBS, S-VHS), 480i Y/Pb/Pr signal
This receives the signal from the Audio Processor (VCTI) and outputs the signal in7W+7W / 10W + 10W sound.
- Power supply : 14V
- Check for input defects : AMP-R,AMP-L
- Check for output defects : L+, L-, R+,R-
Troubleshooting Deflection Block
Countermeasures by Deflection Types
The screen is blank and only the relay repeats close and open when turning the power on. This happens when the vertical voltage or vertical signal is not supplied, and because the Micom operates for 5 to 10 seconds and then turns the power off by force as it cannot detect the vertical signal.
CHECK POINT
Check that the vertical output voltage is measured in the FBT terminal.
VCC (+) : +16.5V
VCC (-) : -16.5V
If you cannot measure the output voltage, check that the collector voltage of the horizontal TR is 1360V. If the voltage is measured, the problem is a defect in the FBT unit. (When you don't have an oscilloscope, and you can hear the high-voltage sound, you can determine that the horizontal TR is normal.)
Is the vertical input waveform output from the VCTI VDP Pin.