Caple C702G Manual de Serviço descarregar pdf (Página 94)

7-6

CONTINUE 1 CONTINUE 2

Measure R/G/B cathode voltages at TP-R, TP-G and TP-B on the CRT PWB

(PWE-567C). Normally, the DC voltage is between approx. 80V

and 150V

point A when BRIGHTNESS is preset. The DC voltage moves 15V or 20V when

BRIGHTNESS changes from min. to max..

Measure the voltage at C747 on the VIDEO PWB (PWB-567A). The

voltage is approx. 230V.

Measure the voltage at TP-G2 on the CRT PWB (PWB-567C). Normally, the

screen voltage is 700!15V

. Adjust 700!5V

if it is different.

Measure the voltage at IC7F1 pin 3 on the CRT PWB (PWE-567C). The voltage

is approx. 6.2V.

CONTINUE

GND

IC731 failure.

BNC: LC761R/G/B, C701R/G/B, C702R/G/B or MD701R/G/B failure.

D-SUB: LC762R/G/B, C703R/G/B, C704R/G/B or MD702R/G/B failure.

Check R/G/B cathode

voltage video output

Check the power

supply voltage of

clamp circuit

LC76A, LC76N or CNP failure.

D741 R/G/B, Q741R/G/B, IC742 or IC751 failure.

Check the screen voltage

・R905, C903, C904 or CNCRT on the CRT PWB (PWB-567C),

T5R1 (FBT) on the SW/HV PWB (PWB-571) or screen wire failure.

・Check H OSC/DEF/HV circuit (see item 6)

Check the heater voltage

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Caple C702G Manual de Serviço Página 94