JVC AV28L2EUBL, Руководство по обслуживанию

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No. 51778
AV28L2EUGR
AV28L2EUBL
AV28L2EUGY
17
ADJUSTMENT
CHECKING ITEM
Item
Measuring
instrument
Test point Adjustment part Description
Check of B1
Power Supply
Signal
Generator
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 FULL mode.
3. Select 2. V/C from the SERVICE MENU.
4. Select 1. RGB BLK with function UP / DOWN key.
5. Press the fu( ) key to find the cut off screen (Black
screen).
6. Connect a DC voltmeter to TP-91(B1) and TP-E(
#
).
7. Make sure that the voltage is DC139.9
±
2.0V.
8. Press the function – ( ) key to return to service menu.
Check of High
Voltage
Signal
Generator
DC volunteer
Remote
Control unit
CRT anode
Chassis GND
1. RGB BLK 1. Receive any broadcast.
2. Press the ZOOM key and select the FULL mode.
3. Select 2. V/C from the SERVICE MENU.
4. Select 1. RGB BLK with function UP / DOWN key.
5. Press the fu( ) key to find the cut off screen (Black
screen).
6. Connect a DC voltmeter to CRT ANODE and chassis GND.
7. Make sure that the voltage is DC 31.0kV .
8. Press the function – ( ) key to return to service menu.
Check of VCO Remote
control unit
1. VCO
"
Under normal conditions, no adjustment is required.
"
Confirmation adjustment.
1. Select 1.IF from the SERVICE MENU.
2. Then select 1.VCO from the IF SERVICE MENU.
3. Receive any broadcast.
4. Check the arrow ( ) position between the ABOVE REF. and
BELOW REF.
TOO HIGH
ABOVE REF
JUST REF
BELOW REF
TOO LOW
i : EXIT
VCO(CW)
****
MHz
MAIN
+1kV
-1.5kV
1. VCO
2. ATT ON/OFF
i : EXIT
IF SERVICE MENU
1-2 : SELECT
(Do not move)