Caple C702G Manual de Serviço descarregar pdf (Página 112)

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8. SELF TEST ERROR

Measure the voltage at IC801 pin 14 on the VIDEO PWB (PWE-567A).

The voltage is approx. 0V when self-test.

Measure the pulse at the collector of Q797 on the VIDEO PWB (PWE-567A).

Normally, the frequency of the pulse is approx. 60kHz.

Check the pulse at IC7A1 pin 17 on the VIDEO PWB (PWE-567A).

Normally, the voltage is approx. 5.0Vp-p.

Measure the pulse at IC8M1 pin 15 on the VIDEO PWB(PWE-549A).

Normally, the frequency of the pulse is approx. 120Hz.

Check the pulses 5Vp-p at IC791 pins 13(R), 15(G), 17(B) and

12(Blanking) on the VIDEO PWB (PWE-567A).

Check the self-test mode

IC801 or its ambient circuit failure

Check the self-test H sync output

･Q797 or its ambient circuit failure

･H OSC/DEF circuit failure (see item 6 )

･Digital control circuit failure (see item 12)

Check the clamp pulse output

･IC7A1 or its ambient circuit failure

･IC731, Q734, Q735, Q796 or their ambient circuit failure

･IC791 and their ambient circuit failure

Check the self-test V sync output

･Q793, Q794 or their ambient circuit failure

･V OSC / DEF circuit failure (see item 6 )

･IC8M1, Q831～3 and their ambient circuit on the VIDEO PWB (PWE-567A) failure

Check the self-test video output

OSM circuit failure (see item 4)

IC711 or its ambient circuit failure

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Caple C702G Manual de Serviço Página 112