Sharp 21HF2-SS, Service Manual

Page: 22 / 73

21HF2-SS
3 – 19
6. HORIZONTAL, VERTICAL, DEFLECTION LOOP and FOCUS ADJUSTMENT
7. PAL CHROMA ADJUSTMENT
No. Adjustment point Adjustment condition/procedure Waveform or others
1 H-SHIFT
( I2C BUS CON-
TROL)
(to be done after
purity adj) 1) Receive Monoscope Pattern Signal (PAL 50 Hz)
2) Choose the service data V13.
3) Adjust the V13 bus data to have a balance position to spec of
A=B (as attach drawing).
4) If cannot make it to A=B, adjust from the best point so that B
slightly smaller than A.
2 V-SHIFT
( I2C BUS CON-
TROL)
(to be done after
purity adj) 1) Receive Monoscope Pattern Signal (PAL 50 Hz) .
2) Choose the service data V12.
3) Adjust V12 bus data to have a most acceptable vertical posi-
tion, the monoscope pattern should be Balance in vertical posi-
tion.
NOTE: Note: B line (Monoscope middle line) must same or near-
est higher position to the A mark (Tube middle mark),
refer to the attach drawing.
3 V-SIZE
( I2C BUS CON-
TROL)
(to be done after
purity, V-shift adj) 1) Receive Monoscope Pattern Signal (PAL 50 Hz).
2) Choose the service data V11.
3) Adjust V11 bus data until the overscan become 10
±
2.5 %.
Caution1: Pls aging TV more than 10 minutes before adjustment.
Caution2: For H-shift, V-shift & V-size adj, after adj please switch
to Monoscope pattern signal (NTSC 60 Hz) to confirm
all positions are same.
4 SUB-SHARPNESS 1) Confirm Service data V08 is 43.
5 Focus 1) Receive the "Monoscope Pattern" signal.
2) Press R/C to set Picture NORMAL condition.
3) Adjust the focus control to get the best focusing.
No. Adjustment point Adjustment condition/procedure Waveform or others
1 SUB COLOUR
( I2C BUS CON-
TROL)
(to be done after
sub-picture, sub-tint
adj) 1) Receive the “PAL Colour Bar” signal.
2) Press R/C to set Picture Normal condition.
3) Connect the oscilloscope to R-Amp Transistor.
Base(TP 851)
•
Range : 100 mV/Div (AC)(Using 10:1 Probe)
•
Sweep Time : 10
μ
sec/Div
4) Using the R/C call V05 in SERVICE mode. Adjust V05 bus
data, so that the 75% White & Red portions of PAL Colour Bar
be at the same level shown as Fig 1-1.
5) Clear the SERVICE mode.
A B
A
B
OK OK NG
F ig. 1-1
C y G B
W Y 100% W Mg R 75%