Table of Contents
Advertisement
6. HORIZONTAL, VERTICAL, DEFLECTION LOOP and FOCUS ADJUSTMENT
No.
Adjustment point
1
H-SHIFT
2
(I
C BUS
CONTROL)
(to be done
after purity
adj)
2
V-SHIFT
2
(I
C BUS
CONTROL)
(to be done
after purity
adj)
3
V-SIZE
2
(I
C BUS
CONTROL)
(to be done
after purity,
V-shift adj)
SUB-
4
SHARPNESS
5
Focus
7. PAL CHROMA ADJUSTMENT
No.
Adjustment point
1
SUB COLOUR
2
(I
C BUS
CONTROL)
(to be done
after sub-
picture, sub-
tint adj)
Adjustment procedure/conditions
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.
Note: B line (Monoscope middle line) must
same or nearest higher position to the A
mark (Tube middle mark),refer to the attach
drawing.
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.
Adjustment procedure/conditions
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.
3 – 20
21J-FG1RU
Waveform and others
A
Figure:
A
B
OK
OK
Waveform and others
Cy
G
W Y 100% W Mg R
75%
Fig. 1-1
B
NG
B
Advertisement
Table of Contents
