Table of Contents
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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
Unplug the AC plug for more than 5 seconds to set the
1.
clock to the non-setting state. Then, set the volume level
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
10
Fig. 1-1
D3-1
NO.
FUNCTION
00
OSD H
01
OSD C
02
CUT OFF
03
H.POSI
04
H.BLK L
05
H.BLK R
06
V.SIZE
07
V.POSI
08
V.LIN
09
VS.CORR
10
V.COMP
11
R.BIAS
12
G.BIAS
13
B.BIAS
14
R.DRV
15
G.DRV
16
B.DRV
17
BRI CENT
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
18
BRI MAX
19
BRI MIN
20
CONT CENT
21
CONT MAX
22
CONT MIN
23
COL CENT
24
COL MAX
25
COL MIN
26
TINT
27
SHARP
28
SUB BIAS
29
H.SIZE
30
PARABOLA
31
TRAPEZIUM
32
COR TOP
33
COR BTM
34
H.COMP
35
T.STE
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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