JVC AV29A10EUS Service Manual page 21

ADJUSTMENT
CHECKING ITEM
Measuring
Item
instrument
Check of B1 DC voltmeter
Power Supply
Remote
Control unit
Check of High High voltage
Voltage meter
Remote
Control unit
ADJUSTMENT OF FOCUS AND SCREEN
Measuring
Item
instrument
Adjustment of Signal
FOCUS generator
Test point Adjustment part
TP-91(B1) 1.RGB BLK
TP-E(# # # # )
[X connector
on POWER &
DEF PWB]
CRT anode 1.RGB BLK
Chassis GND
Test point Adjustment part
FOCUS 1 VR
FOCUS 2 VR
[In HVT]
FOCUS 1 VR
FOCUS 2 VR
SCREEN VR
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.
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.
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.
FOCUS 1 VR
Adjustment point
No. 51818
AV29A10EUS
Description
+1kV
.
-1.5kV
Description
FOCUS 2 VR
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