JVC AV28R25EKS/C, Руководство по обслуживанию

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No. 51941
AV28R25EKS
AV28R250EKS
17
ADJUSTMENTS
CHECK ITEM
Item
Measuring
instrument
Test point Ad justment part Description
POWER
SUPPLY
Check Signal
generator
DC voltmeter
Remote
control unit
TP-91(B1)
TP-E(
"
" "
" )
[X connector
on POWER
DEF PWB]
1. Receive a any broadcast.
2. Push the “ZOOM” key and s elect the FULL mode.
3. Select 2.V/C from the SERVICE MENU.
4. Select 1. CUT OFF with Function UP/DOW N k ey.
5. Show one horizontal line with the 1 key.
6. Turn the SCREEN VR, the whole black screen display.
7. Connect a DC voltmeter to TP-91(B1) and TP-E(
"
).
8. Make sure that the voltage is DC143.0V
±
2.0V.
9. Readjust the SCREEN VR to appear the horizontal line faintly,
and cancel the horizontal line to press the 2 key.
VOLTAGE
Check Signal
generator
DC volunteer
Remote
control unit
CRT anode
Chassis GND
1. Receive a any broadcast.
2. Push the “ZOOM” key and s elect the FULL mode.
3. Select 2.V/C from the SERVICE MENU.
4. Select 1.CUT OFF with Function UP/DOWN key.
5. Show one horizontal line with the 1 k ey.
6. Turn the SCREEN VR, the whole black screen display.
7. Connect a DC voltmeter to CRT ANODE and chassis GND.
8. Make sure that the voltage is DC 31.0kV .
9. Readjust the SCREEN VR to appear the horizontal line faintly,
and c onnect the horizontal line to press 2 key.
ADJUSTMENT OF FOCUS
Item
Measuring
instrument
Test point Ad justment part Description
FOCUS
Ad justment
Signal
generator FOCUS VR
[In FBT] 1. Receive a cross-hatch signal. Select FULL mode.
2. While watc hing the screen, adjust the FOCUS VR to make the
vertical and horizontal lines as fine and sharp as possible.
3. Make sure that when the sc reen is darkened, the lines remain
in good focus.
+1kV
-1.5kV
SCREEN VR
FOCUS VR