JVC AV-34LS Service Manual page 18

AV-34LS AV-34LX
AV-34LH AV-3408TEE
ADJUSTMENTS
B1 POWER SUPPLY
Measuring
Item
instrument
Check of Signal
Generator
B1 POWER
SUPPLY
DC Voltmeter
FOCUS ADJUSTMENT
Measuring
Item
instrument
Adjustment Signal
of FOCUS
generator
IF CIRCUIT ADJUSTMENT
Measuring
Item
instrument
Adjustment Remote
of VCO (CW)
control unit
VCO (CW)
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
Adjustment
Remote
of DELAY control unit
POINT
Setting
(Adjustment time)
NTSC 3.58
DELAY POINT
(AGC TAKE-OVER)
OTHERS
18
Test point Adjustment part
B1 (pin 1)
GND (pin 5)
[CN00S
connector]
Test point Adjustment part
FOCUS VR1,2
[In HVT]
Test point Adjustment part
VCO (CW)
fv
. MHz
YELLOW
DISPLAY : EXIT
DELAY POINT
(AGC TAKE-OVER)
Initial setting value
17
15
No. 51854
Description
1. Receive a black and white signal.
2. Connect a DC voltmeter between B1 and GND
(between pins 1 and 5 of the connector CN00S).
3. Make sure that the voltage is DC134.5 ± 2V.
Description
Notes:
• Proceed to the following this adjustment after having completed the
adjustments of B1 POWER SUPPLY, SUB BRIGHT and SUB CONT.
• Set PICTURE MODE (VSM) to "BRIGHT".
• The final adjustment of CONVERGENCE must be done after the
FOCUS adjustment. (CONVERGENCE is changed by FOCUS ad-
justment.)
When makes difference by FOCUS adjustment, should be reconfirming
PURITY adjustment.
1. Receive a cross-hatch signal.
2. While looking at the screen centre, adjust the FOCUS VR2 (F2) so
that the horizontal lines will be clear and in fine detail.
3. Adjust the FOCUS VR1 (F1) so that the vertical lines will be clear
and in fine detail.
4. Make sure that the picture is in focus even when the screen gets
darkened.
Description
Note:
• Under normal conditions, no adjustment is required.
1. Select 1. IF from the SERVICE MENU.
2. Select 1. VCO by pressing the 1 key on the remote control unit.
3. Receive a broadcast signal.
4. Check the characters colour of the BELOW REFERENCE displayed
to yellow.
5. Press the DISPLAY key three times to return to normal screen.
1. Receive a black and white broadcast signal (colour off).
2. Select 1. IF from the SERVICE MENU.
3. Select 2. DELAY POINT by pressing the 2 key on the remote con-
trol unit.
4. Adjust the MENU –/+ key in order to eliminate any noise or beat
from the image. Any increase above the initial value produces noise
and any decrease below it produces beat.
5. Press the DISPLAY key three times to return to the normal screen.
6. Turn to other channels and make sure that there are no irregulari-
ties.