JVC PD-Z42DX4, Руководство по обслуживанию

Страница: 27 / 168

(No.YA228)1-27
4.7 ADJUSTMENT PROCEDURE
4.7.1 POWER CIRCUIT
Item
Measuring
instrument
Test point Adjustment part Description
PDP POWER
VOLTAGE Signal
generator
DC voltmeter
CN806
1-pin: Vs
9-pin: Va(Vd)
[MAIN POWER UNIT]
Vs VR:190V ADJ
(
VR551 )
Va VR:70V ADJ
(
VR351 )
[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.1)
(2) 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.
(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.2)
< When MAIN POWER UNIT is replaced >
CAUTION:
• Before making adjustments, be sure not to turn on the
power when the CN805 and CN806 connectors are
connected, as this may cause the PDP to break down.
(1) Disconnect the CN805 and CN806 connectors on the
MAIN POWER UNIT.
(2) Connect DC voltmeter to the CN806 connector and turn
on the power. (See Fig.1)
(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 and CN806
connectors 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
TOP
Voltage adjustment VR
MAIN POWER UNIT voltage adjustment point
1. Vs
2. Vs
3. NC
4. GND
5. GND
6. GND
7. GND
8. Va(Vd)
9. Va(Vd)
CN806
Vs
VR551
Va(Vd)
VR351
1
2
3
4
5
6
7
8
9
Vs
Vs
Va
Va
NC
GND
GND
GND
GND
CN806
Va
Vs
( sxxxx / dxxx ) xxx / xxx / xxx
xxx / xxx / xxx / xxx
xx / xx / xx / xx / xx
xxxxxxx
Voltage label
Vs value Va(Vd) value
MAIN POWER UNIT