Service manual

23
20U-FS1
CU20FS1
23-1
23-2
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
OUTPUT
ADJUSTMENT
PROCEDURE
1) GET IN Y-MUTE FUNCTION BY R/C.
2) ADJUST THE V02 BUS DATA TO GET A WAVEFORM AS BELOW.
3) DISABLE THE Y-MUTE
**PLS TAKE NOTE THAT SERVICE MODE DATA F53 NEED TO SET +8
SUB-TINT
V02 STEP RANGE 0-127
I
2
C CONTROL
OPTION SET UP, BUS SET UP, VCO ADJ, RF-AGC
US 10 CH HALF COLOR BAR PATTERN
120V
B-AMP TR BASE (TP851)
CONFIRRM WITH OSCILLOSCOPE
ADJUSTMENT
ITEM
ADJUSTMENT
POSITION
CONTROL PRE-ADJUST
REQUIREMENT
CONTENT
INPUT
CONDITION
OUTPUT
ADJUSTMENT
PROCEDURE
SUB-COLOR
V03 STEP RANGE 0-127
I
2
C BUS CONTROL
OPTION SET UP, BUS SET UP, VCO ADJ, RF-AGC, SUB-PICT, SUB-TINT
US 10 CH HALF COLOR BAR PATTERN
120V
R-AMP TR BASE (TP854)
CONFIRRM WITH OSCILLOSCOPE
[CONFIRMATION]
1) SET THE V03 BUS DATA TO GET A WAVEFORM AS BELOW
2) THIS WAVEFORM SHOWS THAT THE 75% WHITE & RED PORTIONS
OF COLOR BAR BEAT AT THE SAME LEVEL
3) AFTER THAT PLS STEP UP 10 STEP DT AT V03.
[CHECKING CONFIRMATION]
B-AMP BASE (TP851)
MUST BE IN STEPPING
LEVEL
100% WHITE
WY RBMg
Cy G