JVC AV29A10EUS, Service Manual

Page: 21 / 67

No. 51818
AV29A10EUS
21
ADJUSTMENT
CHECKING ITEM
Item
Measuring
instrument
Test point Adjustment part Description
Check of B1
Power Supply DC voltmeter
Remote
Control unit
TP-91(B1)
TP-E(
#
# #
#
)
[X connector
on POWER &
DEF PWB]
1.RGB BLK 1. Receive any broadcast.
2. Press the ZOOM key and select the REGULAR mode.
3. Select 2. V/C from the SERVICE MENU.
4. Select 1. RGB BLK with FUNCTION UP / DOWN key.
5. Press the FUNCTION RIGHT key to turn on the cutoff screen
condition (all black screen).
6. Connect a DC voltmeter to TP-91(B1) and TP-E(
#
).
7. Make sure that the voltage is DC139.9
7
2.0V.
8. Press the FUNCTION LEFT key to return to service menu.
Check of High
Voltage High voltage
meter
Remote
Control unit
CRT anode
Chassis GND
1.RGB BLK 1. Receive any broadcast.
2. Press the ZOOM key and select the REGULAR mode.
3. Select 2. V/C from the SERVICE MENU.
4. Select 1. RGB BLK with FUNCTION UP / DOWN key.
5. Press the FUNCTION RIGHT key to turn on the cutoff screen
condition (all black screen).
6. Connect a High voltage meter to CRT ANODE and chassis
GND.
7. Make sure that the voltage is DC 31.0kV .
8. Press the FUNCTION LEFT key to return to service menu.
ADJUSTMENT OF FOCUS AND SCREEN
Item
Measuring
instrument
Test point Adjustment part Description
Adjustment of
FOCUS Signal
generator
FOCUS 1 VR
FOCUS 2 VR
[In HVT]
1. Receive a crosshatch signal.
2. By turning the FOCUS 2 VR, to make the vertical lines as fine
and sharp as possible.
3. By turning the FOCUS 2 VR, adjust the picture so that the 6th
vertical line from left side of the crosshatch picture becomes
thinnest.
4. By turning the FOCUS 1 VR, adjust the 4th horizontal line from
the upper side may become uniform at the line center and its
periphery.
5. Carry out adjustment by repeating the steps 3 and 4 about.
6. Make sure that when the screen is darkened, the lines remain in
good focus.
SCREEN VR
FOCUS 1 VR
FOCUS 2 VR
FOCUS 2 VR
FOCUS 1 VR
Adjustment point
+1kV
-1.5kV