Caple C702G Wartungshandbuch PDF herunterladen (Seite 116)

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12. DIGITAL CONTROL CIRCUIT FAILURE

12-1. Digital control error

Check +8.5V line Check the voltage at CN-P pin 6 on the VIDEO PWB(PWE-567A).

Check SW REG (see item 13)

Check +5V line Check the voltage at IC8G1 pin 2 on the VIDEO PWB(PWE-567A).

IC8G1 failure.

Check Reset circuit When +5V is supplied to the circuit, IC801 pin 35 should vary from LOW level

(approx. 0V ) to HIGH level ( approx. 5V ).

IC8G1, C814, IC801 failure

Check the waveform at IC801 pins 41 and 42 2Vpp 10MHz sine wave

X801, IC801 failure

Check Sync signals Check the pulse 5Vpp at IC801 pin 4 (H sync), IC801 pin 36 (VD), IC801 pin 59

(H polarity) and IC801 pin 58 (V polarity) on the VIDEO PWB (PWE-567A).

Sync interface circuit failure (see item 3)

IC801 failure

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