JVC PD-35B50BJ Service Manual page 46

4.6 ADJUSTMENT PROCEDURE
Measuring
Item
instrument
PDP POWER DC voltmeter
VOLTAGE
[42V]
Signal generator
Resistor (1kΩ)
DC power
supply
MAIN POWER PWB voltage adjustment point
CN0C4
1 : Vs
2 : Vset
3 : Ve
4 : NC
5 : Va
6 : NC
7 : Vscan
8 : NC
9 : GND
10 : POWER
11 : PANEL POWER
12 : Vs_ON
CN0C4
Vs 1
Vset 2
Ve 3
NC 4
Va 5
NC 6
Vscan 7
NC 8
GND 9
POWER 10
PANEL POWER 11
Vs_ON 12
MAIN POWER PWB
1-42 (No.YA098)
Test point Adjustment part
Connector [MAIN POWER PWB]
CN0C4 Vs VR:170V ADJ
[MAIN POWER (R9424)
PWB] Vset VR:160V ADJ
Vs (R9640)
Vset Ve VR:155V ADJ
Ve (R9646)
Va Va VR:70V ADJ
Vscan (R9219)
Vscan VR:-60V ADJ
(R9628)
Ve
Vs
Vset
Vscan
Va
Voltage adjustment VR
Fig. 1
Vscan Va Ve Vset Vs
3.3V ~ 5.0V
(DC power supply)
1kΩ
(Resistor)
SW1
Fig. 2
Voltage label
NTSC
Va Vsc Vs
XX XX XX
Fig. 3
CAUTION:
•
During adjustment operation of PDP POWER VOLTAGE,
don't touch the heat sink of the MAIN POWER PWB. If you
touch it, electric shock may be caused.
< When MAIN POWER PWB is not replaced >
(1) Connect the DC voltmeter, load resistor (1kΩ), DC
power supply and switch SW1 to the CN0C4 connector
and turn on the main power and switch SW1. (See
Fig.2)
(2) Adjust Vs (170V ADJ) VR, Vset (160V ADJ) VR, Ve (155V
ADJ) VR, Va (70V ADJ) VR and Vscan (-60V ADJ) VR so
that the Vs, Vset, Ve, Va and Vscan 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-right at the back of the PDP. (See Fig.3)
< When MAIN POWER PWB is replaced >
CAUTION:
•
Before making adjustments, be sure not to turn on the
power when the CN8002, CN8003, CN8005, CN8006
and CN8008 connectors are connected, as this may
cause the PDP to break down.
(1) Disconnect the CN8002, CN8003, CN8005, CN8006
and CN8008 connectors on the MAIN POWER PWB.
(2) Connect the DC voltmeter, load resistor (1kΩ), DC
power supply and switch SW1 to the CN0C4 connector
and turn on the main power and switch SW1. (See
Fig.2)
(3) Adjust Vs (170V ADJ) VR, Vset (160V ADJ) VR, Ve (155V
ADJ) VR, Va (70V ADJ) VR and Vscan (-60V ADJ) VR so
that the Vs, Vset, Ve, Va and Vscan voltage coincides
with the values in the voltage label.
(4) Turn off the main power and switch SW1, and connect
the CN8002, CN8003, CN8005, CN8006 and CN8008
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
NTSC/PAL
voltage label, fine-tune without unplugging the
Ve Vset
connectors.
XX XX
CAUTION:
•
Designated power supply voltage of the panel (Vs, Vset,
Ve, Va, Vscan) varies according to the PDP unit.
•
Pay careful attention during adjustment, as any error in
procedure may cause the PDP to break down.
Description