Sharp 21V-R70M, Service Manual

Page: 18 / 42

18-1 18-2
H-VCO
V21 STEP RANGE 0-7
I
2
C CONTROL
OPTION SET UP, BUS SET UP
NO SIGNAL (RASTER) CONDITION
AC 230V
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" PLS REPEAT STEP2
[CHECKING SPEC]
FREQ = 15.735 ± 0.2 KHz
SYMBOL REVISED CONTENT,
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
OUTPUT
ADJUSTMENT
PROCEDURE
HISTORY
OF REVISION
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
OUTPUT
ADJUSTMENT
PROCEDURE
HISTORY
OF REVISION
(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 STEP 2
(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 230V
CONFIRMATION ON CRT DISPLAY (AUTO), IC801 PIN 2 VOLTAGE (MANUAL).
[CHECKING SPEC]
2.5 ± 0.5 V DC (CHECKING SPEC : 2.50 ± 1.5V)
SYMBOL REVISED CONTENT,
2
1
V-R
7
0
M