ELECTRICAL ADJUSTMENTS
D3-1
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.)
On-Screen Display Adjustment
Set the volume level to minimum.
Press both 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.
FUNCTION
OSD H
CUT OFF
RF AGC
V.VCO
H.VCO
H.PHAS
V.SIZE
V.SFT
R.DRV
B.DRV
R CUT OFF
G CUT OFF
B CUT OFF
BRI.CENT
BRI.MAX
BRI.MIN
NO.
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Fig. 1-2
FUNCTION
CONT.CENT
CONT.MAX
CONT.MIN
COL.CENT
COL.MAX
COL.MIN
TINT
SHARP
FM.LVL
LVL
SEP1
SEP2
T.MONO
T.STE
NO.
16
17
18
19
20
21
22
23
24
25
26
27
28
29
TV
00 OSD H 18
Prepare the following measurement tools for electrical
adjustments.
Oscilloscope
Digital Voltmeter
Pattern Generator
1.
2.
3.
(VCR SECTION)
2-1: PG SHIFTER
1.
2.
3.
4.
5.
Connect the connector of AV Jack Jig (JG180) to
CP1003.
Connect CH-1 on the oscilloscope to TP1002 and CH-2
to Hot side of JG180 Video out Jack.
Playback the alignment tape.
Press both VOL.DOWN button on the set and the
Channel button (5) on the remote control simultaneously
to set tracking to center.
Press the VOL. DOWN button on the set and the
channel button (3) on the remote control simultaneously
until the indicator REC disappears. If the indicator REC
disappears, adjustment is completed.
(If the above adjustments doesn't work well:)
6.
7.
8.
9.
Press the VOL. DOWN button on the set and the
channel button (3) on the remote control simultaneously
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 simultaneously 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)
Press the Tracking Auto button.
6.5H
CH-1
CH-2
Fig. 2-1-A
2. BASIC ADJUSTMENTS
