Sharp 20U-FS1, Service Manual

Page: 20 / 56

20
20U-FS1
CU20FS1
20-1
20-2
ADJUSTMENT ITEM ADJUSTMENT POSITION CONTR
OL
PRE-ADJUST REQ
UIREMENT
CONTENT INPUT CONDITION OUTPUT ADJUSTMENT PR
OCEDURE
(A
T SELF ADJUSTMENT MODE)
1)
GO INT
O SER
VICE MODE, BY SELECTING
THE SER
VICE D
A
T
A
V10
2
)
PRESS
THE R/C FOR A
UT
O PIF-VCO KEY
, OSD APPEAR
“OK
” AT
SCREEN
3)
IF APPEAR
“NG
” PLS REPEA
T STEP2
4)
AFTER
“OK
” CONDITION STEP DO
WN ONE STEP
.
(A
T MANU
AL ADJUSTMENT MODE)
1)
GO INT
O SER
VICE MODE, BY SELECTING
THE SER
VICE D
A
T
A
V10
2
)
ADJUST
THE D
A
T
A
UP/DO
WN UNTIL IC801 PIN 2
V
O
LT
A
GE BECOME
AS SPECIFIED BELO
W
PIF-VCO
V10
STEP RANGE
0~63
I 2
C CONTR
OL
OPTION SET UP
, B
US SET UP
NO SIGNAL (RASTER) CONDITION A
C
120V
CONFIRMA
TION ON CR
T DISPLA
Y (A
UT
O), IC801 PIN 2
V
O
LT
A
GE (MANU
AL).
ADJUSTMENT ITEM ADJUSTMENT POSITION CONTR
OL
PRE-ADJUST REQ
UIREMENT
CONTENT INPUT CONDITION OUTPUT ADJUSTMENT PR
OCEDURE
RF-A
GC
V08
STEP RANGE
0-127
I
2
C CONTR
OL
OPTION SET UP
, B
US SET UP
US10CH HALF COLOR BAR RF INPUT FIELD STRENGTH
56dBµV
(FIX)
TUNER A
GC
TERMINAL (TP 201) OR CR
T DISPLA
Y CONFIRMA
TION
[CHECKING SPEC] 2.5 ± 0.5
V DC (CHECKING SPEC :
2.50 ± 1.5V)
(A
T SELF ADJUSTMENT MODE)
1.
GO
T
O
SER
VICE MODE
2
.
GO
T
O
SER
VICE D
A
T
A
V08
, PRESS R/C
T
O
OPEARA
TE A
U
T
O-A
GC
KEY AND CONFIRM
THE
OK
DISPLA
Y ON
THE SCREEN.
3.
IF APPEAR NG PLS REPEA
T STEP 2 A
G
AIN.
(A
T MANU
AL ADJUSTMENT MODE)
1
.
ADJUST
THE
V08 BUS D
A
T
A
UNTIL A
GC
TERMINAL
V
O
LT
A
GE BE-
COME MAXIMUM,
THEN DR
OP 0.1V BELO
W MAXIMUM
V
O
LT
A
GE.
2.
CHANGE
THE ANTENNA INPUT SIGNAL
T
O
63-67 dBµV
, AND MAKE
SURE
THERE IS NO NOISE
3
.
CHANGE
THE ANTENNA INPUT SIGNAL
T
O
90-95 dBµV
T
O
BE SURE
THA
T
THERE IS NO CR
OSS MODULA
TION BEA
T
.
[CHECKING SPEC] MAX - 0.1V dc