Service manual

19
19-1
19-2
20F630
CU20F630
ADJUSTMENT ITEM ADJUSTMENT POSITION CONTROL PRE-ADJUST REQUIREMENT CONTENT INPUT CONDITION OUTPUT
ADJUSTMENT PROCEDURE
H-VCO
V21 STEP RANGE 0-7
I
2
C CONTROL
OPTION SET UP, BUS SET UP NO SIGNAL (RASTER) CONDITION AC 120V IC 801 PIN 11 (MANUAL ADJ)
1) GO TO SERVICE MODE, 2) GO TO SERVICE DATA V21, ADJ UNTIL FREQ AS BELOW (SELF ADJ) 1) GO TO SERVICE MODE, BY SELECTING THE SERVICE DATA V21 2) PRESS THE R/C TO OPERATE AUTO H-VCO, OSD APPEAR "OK" AT
SCREEN
3) IF APPEAR "NG" REPEAT STEP 2
[CHECKING SPEC] FREQ = 15.735 ± 0.2 KHz
ADJUSTMENT ITEM ADJUSTMENT POSITION CONTROL PRE-ADJUST REQUIREMENT CONTENT INPUT CONDITION OUTPUT
ADJUSTMENT PROCEDURE
(AT SELF ADJUSTMENT MODE) 1) GO INTO SERVICE MODE, BY SELECTING THE SERVICE DATA V10 2) PRESS THE R/C FOR AUTO PIF-VCO KEY, OSD APPEAR “OK” AT
SCREEN
3) IF APPEAR “NG” PLS REPEAT STEP2 (AT MANUAL ADJUSTMENT MODE) 1) GO INTO SERVICE MODE, BY SELECTING THE SERVICE DATA V10 2) ADJUST THE DATA UP/DOWN UNTIL IC801 PIN 2 VOLTAGE BECOME
AS SPECIFIED BELOW
PIF-VCO
V10 STEP RANGE 0~63
I
2
C CONTROL
OPTION SET UP, BUS SET UP NO SIGNAL (RASTER) CONDITION AC 120V
CONFIRMATION ON CRT DISPLAY (AUTO), IC801 PIN 2 VOLTAGE (MANUAL).
[CHECKING SPEC] 2.5 ± 0.5 V DC (CHECKING SPEC : 2.50 ± 1.5V)