ELECTRICAL ADJUSTMENTS
D3-1
1.
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).
BEFORE MAKING ELECTRICAL
ADJUSTMENTS
Prepare the following measurement tools for electrical
adjustments.
1. Oscilloscope
2. Digital Voltmeter
3. Multi-sound Generator
4. Pattern Generator
FUNCTION
OSD H
CUT OFF
RF.AGC
---
H.POSI
V.POSI
H.SIZE
V.SIZE
V.CENT
V.LIN
VS.CORR
G.DRV
B.DRV
R.BIAS
G.BIAS
B.BIAS
BRI CENT
BRI MAX
BRI MIN
NO.
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
FUNCTION
SUB CONT
UNI COL CENT
UNI COL MAX
UNI COL MIN
COL CENT
COL MAX
COL MIN
TINT
SHARP
RGB CONT
PARABOLA
TRAPEZIUM
COR TOP
COR BTM
V EHT
H EHT
FM.LVL
T.STE
NO.
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Fig. 1-2
(VCR SECTION)
2-1: PG SHIFTER
1.
2.
3.
4.
Connect CH-1 on the oscilloscope to TP102 and CH-2
to TP4201.
Playback the alignment tape.
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.
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.
6.
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.
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 Tr/- 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
6.5H
Fig. 2-1-B
CH-2
CH-1
CH-1
CH-2
Fig. 2-1-A
2. BASIC ADJUSTMENTS
On-Screen Display Adjustment
Unplug the AC plug for more than 5 seconds to set the
clock to the non-setting state. Then, set the volume
level to minimum.
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.
1.
2.
Fig. 1-1
Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
Press the MENU button on the remote control to end
the adjustments.
3.
4.
TV
00 OSD 20
