Sharp 20F630, Service Manual

Page: 19 / 64

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 1
1
(MANUAL
ADJ)
1)
GO
T
O
SER
VICE MODE,
2)
GO
T
O
SER
VICE DA
T
A
V21
,
ADJ UNTIL
FREQ
AS BELOW
(SELF ADJ) 1)
GO
T
O
SER
VICE MODE, BY
SELECTING
THE SER
VICE DA
T
A
V21
2)
PRESS
THE R/C
T
O
OPERA
TE
AUT
O H-VCO, OSD
APPEAR "OK"
A
T
SCREEN
3)
IF
APPEAR "NG" REPEA
T
STEP
2
[CHECKING SPEC]
FREQ = 15.735 ± 0.2 KHz
ADJUSTMENT ITEM ADJUSTMENT POSITION CONTROL PRE-ADJUST REQUIREMENT CONTENT INPUT CONDITION OUTPUT ADJUSTMENT PROCEDURE
(A
T
SELF
ADJUSTMENT
MODE)
1)
GO INT
O SER
VICE MODE, BY
SELECTING
THE SER
VICE DA
T
A
V10
2
)
PRESS
THE R/C FOR
AUT
O PIF-VCO KEY
, OSD
APPEAR “OK”
A
T
SCREEN
3)
IF
APPEAR “NG” PLS REPEA
T
STEP2
(A
T
MANUAL
ADJUSTMENT
MODE)
1)
GO INT
O SER
VICE MODE, BY
SELECTING
THE SER
VICE DA
T
A
V10
2
)
ADJUST
THE DA
T
A
UP/DOWN UNTIL
IC801 PIN 2 VOL
T
AGE 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 CONFIRMA
TION ON CR
T
DISPLA
Y
(AUT
O), IC801 PIN 2 VOL
T
AGE (MANUAL).
[CHECKING SPEC] 2.5 ± 0.5 V DC (CHECKING SPEC : 2.50 ± 1.5V)