Before Making Electrical Adjustments; Basic Adjustments - JVC TV-13142 Service Manual

TV-13142
TV-13142W
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.
Inferior silicon grease can damage IC's and transistors.
• When replacing IC's and transistors, use only specified
silicon grease (YG6260M).
Remove all old silicon before applying new silicon.
On-Screen Display Adjustment
1. 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.
2. Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control simultaneously
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.
NO. FUNCTION NO.
00 OSD H 13
01 CUT OFF 14
02 RF DELAY 15
03 VIF VCO 16
04 H VCO 17
05 H PHASE 18
06 V SIZE 19
07 V SHIFT 20
08 R DRIVE 21
09 B DRIVE 22
10 R CUT OFF 23
11 G CUT OFF 24
12 B CUT OFF
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ELECTRICAL ADJUSTMENTS
TV
15
Fig. 1-1
FUNCTION
BRIGHTNESS
CONTRAST
COLOR
TINT
SHARPNESS
FM LEVEL
LEVEL
SEPARATION 1
SEPARATION 2
TEST MONO
TEST STEREO
X-RAY TEST
Fig. 1-2

2. BASIC ADJUSTMENTS

(VCR SECTION)
2-1: PG SHIFTER
1. Connect CH-1 on the oscilloscope to TP1002 and CH-2
to pin 4 of CP1003.
2. Playback the alignment tape.
3. Press and hold the Tracking-Auto button on the remote
control 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 simultaneously
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 simultaneously
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 simultaneously 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)
7. Press the Tracking Auto button.
6.5H
6.5H
2-2: VCO FREERUN
1. Receive the VHF HIGH.
2. Place the set with Aging Test for more than 10 minutes.
3. Connect the digital voltmeter between the pin 5 of
CP351 and the pin 1 (GND) of CP351.
4. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "VIF VCO".
5. Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 2.5V.
6. After the 2.5V adjustment, countdown the VIF VCO step
No. by 1 step with the VOL. DOWN button.
CH-2
CH-1
Fig. 2-1-A
CH-2
CH-1
Fig. 2-1-B