JVC AV-25P8(PH) Service Manual page 25

ADJUSTMENTS
CHECK ITEMS BEFORE ADJUSTMENTS
Measuring
Item
instrument
Check of B1 Signal
generator
Power Supply
DC voltmeter
Check of High Signal
generator
Voltage
High voltage
meter
FOCUS ADJUSTMENT
Measuring
Item
instrument
Adjustment of Signal
generator
FOCUS
FOCUS
Test point Adjustment part
TP-91(B1)
TP-E(! ! ! ! )
[X Connector
on POWER
DEF PWB]
CRT anode
Test point Adjustment part
FOCUS VR [In HVT]
No. 51752
Description
1. Input the black and white signal.
2. Select 2. V/C from the SERVICE MENU.
3. Select 1. CUT OFF with MENU UP / DOWN key.
4. Show one horizontal line by pressing the 1 key.
5. Turn the SCREEN VR until not to display the one horizontal line.
6. Connect the DC voltmeter to TP-91(B1) and TP-E(!).
7. Make sure that the voltage is DC134.0 ±2.0V.
8. Readjust the SCREEN VR to appear the horizontal line faintly,
and cancel the horizontal line by pressing the 2 key.
1. Input the black and white signal.
2. Select 2. V/C from the SERVICE MENU.
3. Select 1. CUT OFF with MENU UP / DOWN key.
4. Show one horizontal line by pressing the 1 key.
5. Turn the SCREEN VR until not to display the one horizontal line.
6. Connect a High voltage meter to CRT ANODE.
7. Make sure that the voltage is DC 31.0kV±1.5kV.
8. Readjust the SCREEN VR to appear the horizontal line faintly,
and cancel the horizontal line by pressing 2 key.
Description
1. Input the cross-hatch signal.
2. By turning the FOCUS VR, adjust the center part of the cross-
hatch picture becomes thinnest.
3. Make sure that when the screen is darkened, the lines remain in
good focus.
AV-25PX
17