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1.
BEFORE MAKING ELECTRICAL
ADJUSTMENTS
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
•
Use an isolation transformer when performing any service
on this chassis.
•
Before removing the anode cap, discharge electricity
because it contains high voltage.
•
When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
•
When you exchange IC and Transistor for a heat sink,
apply the silicon grease on the contact section of the heat
sink. Before applying new silicon grease, remove all the old
silicon grease. (Old grease may cause damages to the IC
and Transistor).
Prepare the following measurement tools for electrical
adjustments.
1. Oscilloscope
2. Digital Voltmeter
3. Multi-sound Generator
4. Pattern Generator
On-Screen Display Adjustment
1.
Set the VOLUME to minimum.
2.
Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control for more than 2
seconds to appear the adjustment mode on the screen as
shown in Fig. 1-1.
00 OSD
3.
Use the Channel UP/DOWN button or Channel button (0-
9) on the remote control to select the options shown in
Fig. 1-2.
4.
Press the MENU button on the remote control to end the
adjustments.
ELECTRICAL ADJUSTMENTS
TV
07
Fig. 1-1
D3-1
NO.
FUNCTION
00
OSD H
01
CUT OFF
02
H.POSI
03
V.POSI
04
H.SIZE
05
V.SIZE
06
V.LIN
07
V-EHT
08
H-EHT
09
V-BLK P
10
V-BLK S
11
V.CENT
12
V.LIMIT
13
V.CORR
14
V.S.CORR
15
EW PARA
16
TRAPEZIUM
17
COR. TOP
18
COR. BTM
19
S.CORR
20
CORNER
21
C.PARA
22
C.SAW
23
V.SYMM
2. BASIC ADJUSTMENTS
(VCR SECTION)
2-1: PG SHIFTER
1.
Connect CH-1 on the oscilloscope to TP102 and CH-2 to
TP4201.
2.
Playback the alignment tape.
3.
Press both VOL. DOWN button on the set and the
Channel button (5) on the remote control for more than 2
seconds to set tracking to center.
4.
Press the VOL. DOWN button on the set and the channel
button (3) on the remote control for more than 2 seconds
until the indicator REC disappears. If the indicator REC
disappears, adjustment is completed.
(If the above adjustments doesn't work well:)
5.
Press the VOL. DOWN button on the set and the channel
button (3) on the remote control for more than 2 seconds
until the indicator REC disappears.
6.
When the REC indicator is blinking, press both VOL.
DOWN button on the set and the channel button (4) on
the remote control for more than 2 seconds and adjust
the Tracking +/- button until the arising to the down of
Head Switching Pulse becomes 6.5 ± 0.5H.
(Refer to Fig. 2-1-A, B)
6.5H
NO.
FUNCTION
24
R.BIAS
25
G.BIAS
26
B.BIAS
27
R/G.DRV
28
B/G.DRV
29
R-Y GAIN
30
R-Y PHASE
31
G-Y GAIN
32
G-Y PHASE
33
BRI.CENT
34
BRI.MAX
35
BRI.MIN
36
CONT. CENT
37
CONT. MAX
38
CONT. MIN
39
COL. CENT
40
COL. MAX
41
COL. MIN
42
SUB CONT
43
TINT
44
SHARP.CENT
45
SHARP.MAX
46
SHARP.MIN
Fig. 1-2
CH-2
CH-1
Fig. 2-1-A
CH-2
CH-1
6.5H
Fig. 2-1-B
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