Sharp 21J-FG1RU, Service Manual

Page: 23 / 75

21J-FG1RU
3 – 20
6. HORIZONTAL, VERTICAL, DEFLECTION LOOP and FOCUS ADJUSTMENT
7. PAL CHROMA ADJUSTMENT
No. Adjustment point Adjustment procedure/conditions Waveform and others
H-SHIFT
(I
2
C BUS
CONTROL)
(to be done
after purity
adj)
1
V-SHIFT
(I
2
C BUS
CONTROL)
(to be done
after purity
adj)
2
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 .
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 position, the monoscope pattern should
be
Balance in vertical position.
1) Receive Monoscope Pattern Signal (PAL 50 Hz)
2) Choose the service data
V11 .
3) Adjust V11 bus data until the overscan become
10
±
1.5 %
Caution1: Pls aging TV more than 10 minutes
before adjustment.
Caution2: for H-shift & V-shift & V-size adj, after
adj pls switch to Monoscope pattern
signal (NTSC 60 Hz) to confirm all
position are the same.
1) Confirm Service data V08 is 46 .
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.
V-SIZE
(I
2
C BUS
CONTROL)
(to be done
after purity,
V-shift adj)
3
SUB-
SHARPNESS
4
Focus
5
A
A B
OK OK NG
Note: B line (Monoscope middle line) must
same or nearest higher position to the A
mark (Tube middle mark),refer to the attach
drawing.
B
Figure:
No. Adjustment point Adjustment procedure/conditions Waveform and others
SUB COLOUR
(I
2
C BUS
CONTROL)
(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 : 100mV/Div (AC)
(Using 10:1 Probe)
Sweep Time : 10
µ
sec/Div
4) Using the R/C call V05 in SERVICE mode. Ad-
just 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.
1
Fig. 1-1
Cy G B
W Y 100% W Mg R
75%