Out Of Cg-Specification - NEC MultiSync FP1370 Service Manual

16. OUT OF Cg-SPECIFICATION

Adjust the static and the dynamic convergence with OSD control.
NG
Check +20V / -20V line
After pull out CN-D from CONV PWB, check the voltage at CN-D pin 1(+20V) and pin 3(-20V).
NG
Check +20V / -20V REG. circuit (see item 13)
OK
Check +20V / -20V line again
After put CN-D on CONV PWB, check the voltage at CN-D pin 1(+20V) and pin 3(-20V).
NG
OK
Check the input voltage at XSC,YSC
Measure the voltage at CNCCB pin 9(YSC) and pin 10(XSC).
The voltage of pin 9 varies from +1.2V to +2.1V by adjusting V.S.CONVER.
The voltage of pin 10 varies from +1.2V to +2.1V by adjusting H.S.CONVER.
NG
OK
Check the output voltage of IC8U1 (digital convergence IC)
Measure the voltage at pin3 of and pin5 of IC8W2.
Normally, those voltages are approx. 2.5V.
NG
IC8U1, IC8U2 or its associated circuit failure.
OK
Check the output voltage of IC8P2
Measure the voltage of pin 1 and pin 7 at IC8P2.
The voltage of pin 1 at IC8P2 varies from -0.8V to +0.8V by adjusting V.S.CONVER.
The voltage of pin 7 at IC8P2 varies from -0.7V to +0.7V by adjusting H.S.CONVER.
NG
IC8P2 or its associated circuit failure.
OK
IC8P1 or its associated circuit failure.
The convergence coil in the CRT failure.
IC8P1, Q8R1 or its associated circuit failure.
IC8T1, IC8T2 failure.
IC501, IC510 or its associated circuit on the OSC PWB failure.
7-35
OK