21
21-1
21-2
20F650
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 56dB
µ
V (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 OPEARATE 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 dBµV, AND MAKE
SURE THERE IS NO NOISE
3. CHANGE THE ANTENNA INPUT SIGNAL TO 90-95 dBµV 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 DISABLE 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 US4CH LION HEAD
120V
CONFIRMATION ON CRT DISPLAY
[VOLTAGE CONFIRMATION]
SYMBOL REVISED CONTENT,
To Next Page
Loading...
Need help?
General
