JVC PD-Z42DX4 Service Manual page 27

4.7 ADJUSTMENT PROCEDURE
4.7.1 POWER CIRCUIT
Measuring
Item
instrument
PDP POWER Signal
VOLTAGE generator
DC voltmeter
MAIN POWER UNIT voltage adjustment point
CN806
Vs 1
Vs 2
NC 3
GND 4
GND 5
GND 6
GND 7
Va 8
Va
9
Vs value Va(Vd) value
Voltage label
( sxxxx / dxxx ) xxx / xxx / xxx
xxx / xxx / xxx / xxx
xx / xx / xx / xx / xx
xxxxxxx
Test point Adjustment part
CN806 Vs VR:190V ADJ
1-pin: Vs (VR551)
9-pin: Va(Vd) Va VR:70V ADJ
[MAIN POWER UNIT] (VR351)
[MAIN POWER UNIT]
TOP
CN806
1. Vs
VR351
2. Vs
Va(Vd)
3. NC
4. GND
5. GND
6. GND
VR551
7. GND
Vs 8. Va(Vd)
9. Va(Vd)
Voltage adjustment VR
Fig.1
Vs
Va
Fig.2
MAIN POWER UNIT
Fig.3
Description
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
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
connected, as this may cause the PDP to break down.
(1) Disconnect the CN805
MAIN POWER UNIT.
(2) Connect DC voltmeter to the
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
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.
CN806 connector and
and CN806 connectors are
and CN806 connectors on the
CN806 connector and turn
CN805 and CN806
(No.YA228)1-27