Sharp 21V-R70M, Service Manual

Page: 19 / 42

19-1 19-2
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
OUTPUT
ADJUSTMENT
PROCEDURE
HISTORY
OF REVISION
RF-AGC
V08 STEP RANGE 0-127
I
2
C CONTROL
OPTION SET UP, BUS SET UP
US10CH HALF COLOR BAR
RF INPUT
FIELD STRENGTH 53dB uV (FIX)
TUNER AGC TERMINAL (TP 201) OR CRT DISPLAY CONFIRMATION
(AT SELF ADJUSTMENT MODE)
1. GO TO SERVICE MODE
2. GO TO SERVICE DATA V08, PRESS R/C TO OPERATE AUTO-AGC
KEY AND CONFIRM THE OK DISPLAY ON THE SCREEN.
3. IF APPEAR NG PLS REPEAT STEP 2 AGAIN.
(AT MANUAL ADJUSTMENT MODE)
1. ADJUST THE V08 BUS DATA UNTIL AGC TERMINAL VOLTAGE BE-
COME MAXIMUM, THEN DROP 0.1V BELOW MAXIMUM VOLTAGE.
2. CHANGE THE ANTENNA INPUT SIGNAL TO 63-67 dBmV, AND MAKE
SURE THERE IS NO NOISE
3. CHANGE THE ANTENNA INPUT SIGNAL TO 90-95 dBmV TO BE SURE
THAT THERE IS NO CROSS MODULATION BEAT.
[VOLTAGE CONFIRMATION]
MAX - 0.1V dc
SYMBOL REVISED CONTENT,
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL
PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
OUTPUT
ADJUSTMENT
PROCEDURE
HISTORY
OF REVISION
1) IN SERVICE MODE, SET V04&V11&V12&V13 TO 127; V14&V15 TO
64, GET IN Y-MUTE BY R/C AND SET V19 TO "1", PICTURE APPEAR
IN CUT-OFF CONDITION
2) ADJUST THE SCREEN SO THAT CUT-OFF LINE APPEAR IN LOW
BRIGHT, THEN JUDGE THAT WHETHER THE CUT-OFF LINE APPEAR
IN RED OR GREEN OR BLUE COLOR, IN THIS CONDITION V11=R-
CUTOFF, V12=G-CUTOFF, V13=B-CUT-OFF, FIX THE DATA OF THE
COLOR APPEAR IN CUTOFF LINE AND USE R/C TO ADJUST THE
OTHER TWO CUT-OFF DATA SO THAT CUT-OFF LINE COLOR BE-
COME WHITE.
3) TURN THE SCREEN VR OF FBT SO THAT CUT-OFF LINE JUST DIS-
APPEAR AND USE R/C TO SET V19 TO "0", NEXT DIASBLE THE Y-
MUTE SO THAT PICTURE APPEAR IN NORMAL MODE.
SCREEN
V11,V12,V13 STEP RANGE 0-255
I
2
C CONTROL
OPTION SET UP, BUS SET UP
WINDOW PATTERN OR US6 CH LION HEAD
230V
CONFIRMATION ON CRT DISPLAY
[VOLTAGE CONFIRMATION]
SYMBOL REVISED CONTENT,
2
1
V-R
7
0
M