JVC PD-Z50DX4, Service Manual

Page: 26 / 189

1-26 (No.YA229)
4.7 ADJUSTMENT PROCEDURE
4.7.1 POWER CIRCUIT [DISPLAY UNIT]
Item
Measuring
instrument
Test point Adjustment part Description
PDP POWER
VOLTAGE Signal
generator
DC voltmeter
Connector
CN806
Vs
Va
[MAIN
POWER
UNIT]
Vs VR:190V ADJ ( R551 )
Va VR:60V ADJ ( R351 )
[MAIN POWER UNIT]
CAUTION:
• During adjustment operation of PDP POWER
VOLTAGE, don't touch the heat sink of the MAIN
POWER UNIT. If you touch it, electric shock may
be caused.
< When MAIN POWER UNIT is not replaced >
(1) Connect the DC voltmeter to the CN806
connector and turn on the power. (See Fig.2)
(2) Adjust Vs (190V ADJ) VR and Va (60V ADJ) VR
so that the Vs and Va voltage coincides with the
values in the voltage label.
(3) Input a PAL all-black signal and check that it
coincides with the values in the voltage label.
(4) Readjust if the adjusted value is different from
those in the voltage label.
NOTE:
• Designed value for the panel is printed on a label
on the upper-left at the back of the PDP. (See
Fig.3)
< When MAIN POWER UNIT is replaced >
CAUTION:
• Before making adjustments, be sure not to turn
on the power when the CN805 connector are
connected, as this may cause the PDP to
break down.
(1) Disconnect the CN805 connector on the MAIN
POWER UNIT.
(2) Connect DC voltmeter to the CN806 connector
and turn on the power. (See Fig.2)
(3) Adjust Vs (190V ADJ) VR and Va (70V ADJ) VR
so that the Vs and Va voltage coincides with the
values in the voltage label.
(4) Turn off the power, and connect the CN805
connector and turn on the power again.
(5) Input a PAL all-black signal and check that it
coincides with the values in the voltage label.
(6) If the adjusted value is different from those in
the voltage label, fine-tune without unplugging
the connectors.
CAUTION:
• Designated power supply voltage of the panel
(Vs, Va) varies according to the PDP unit.
• Pay careful attention during adjustment, as
any error in procedure may cause the PDP to
break down.
Fig.1
Fig.2
Fig.3
Voltage adjustment VR
MAIN POWER UNIT voltage adjustment point
1. Vs
2. Vs
3. Vs
4. NC
5. GND
6. GND
7. GND
8. GND
9. Va
10. Va
Vs
CN806
CN806
R551
CN9001
CN8001
CN8009
CN805
CN8011
Va
R531
1
2
3
4
5
6
7
8
9
10
Vs
Vs
Vs
NC
GND
GND
GND
GND
Va
Va
Va
Vs
CN806
Voltage label
MAIN POWER UNIT
MODEL:PDP50x2xxxx
ALL Voltage:DC5V
Va:xxV Vs:xxxV
Max Watt:xxxW