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PD-42DX
3.8 ADJUSTMENT PROCEDURE
3.8.1 DISPLAY UNIT
Measuring
Item
instrument
PDP POWER
DC voltmeter
SUPPLY
VOLTAGE
Signal generator
Resistor (5Ω/5W)
Item
CN0AU/CN0AT
measured
Disconnected
Designated
Vs
value for panel
±0.5V
Designated
value for panel
Vd
±0.5V
5V
5.25 ± 0.15V
CN0C4
Vs
1
NC
2
Vd
3
4
NC
5
5V
GND
6
Designated panel voltage
Designated panel voltage
Vs/Vd voltage label
Vs/Vd voltage label
SYSTEM POWER
SYSTEM POWER
PWB
PWB
AUDIO
AUDIO
PWB
PWB
LINE FILTER PWB
LINE FILTER PWB
Chassis
Chassis
Designated value for panel / layout of adjustment VR
Designated value for panel / layout of adjustment VR
1-40 (No.52088)
Test point
Connector
CN0C4
[PDP POWER
PWB]
CN0AU/CN0AT
Connected
Designated
value for panel
±0.5V
Designated
value for panel
±0.5V
5.20 ± 0.15V
PDP POWER PWB: Chassis base
5Ω/5W
/5W
(Load resistor)
(Load resistor)
5V
Vd
Fig.1
Voltage adjustment VR (Vs, Vd)
Voltage adjustment VR (Vs, Vd)
R628
CN0AU
170V
R721
CN0AT
60V
PDP POWER PWB
PDP POWER PWB
DISPLAY INTERFACE PWB
DISPLAY INTERFACE PWB
Display Input
Display Input
Terminal
Terminal
Base
Base
(Rear view)
(Rear view)
Fig.2
Adjustment part
Vs VR :170V ADJ
<When PDP POWER PWB is not replaced>
(R628)
(1) Connect the load resistor (5Ω/5W) to the CN0C4
Vd VR : 60V ADJ
connector on the PDP POWER PWB. (See Fig.1)
(R721)
(2) Adjust Vs (170V ADJ) VR and Vd (60V ADJ) VR
such that the Vs and Vd load resistor voltage tally
with those in the table.
(3) Ensure that the voltage between pins 5 and 6 of
CN0C4 (5V) coincides with the table's value.
(4) Input a PAL (625i) all-black signal and check that
voltage coincides with the values in the table.
(5) Readjust if the adjusted value is different from those
Adjustment
in the table.
VR
NOTE:
R628
Designated value for the panel is printed on a small
label on the top left corner at the back of the PDP.
R721
-
<When PDP POWER PWB is replaced>
CAUTION:
Before making adjustments, be sure not to turn on the
power when the CN0AT and CN0AU connectors are
connected, as this may cause the PDP to break down.
(1) Disconnect the CN0AT and CN0AU connectors on
the PDP POWER PWB.
(2) Connect the load resistor (5Ω/5W) to the CN0C4
connector and turn on the power.
(3) Adjust Vs (170V ADJ) VR and Vd (60V ADJ) VR so
that the Vs and Vd voltage coincides with the values
in the table.
(4) Ensure that the voltage between pins 5 and 6 of
CN0C4 (5V) coincides with the values in the table.
(5) Turn off the power, and connect the CN0AT and
Vs
CN0AU connectors and turn on the power again.
(6) Input a PAL (625i) all-black signal and check that it
coincides with the values in the table.
(7) If the adjusted value is different from those in the
table, fine-tune without unplugging the connectors.
CAUTION:
Designated power supply voltage of the panel (Vs, Vd)
varies according to the PDP unit. (See Fig.2)
Pay careful attention during adjustment, as any error in
procedure may cause the PDP to break down.
CN0C4
Connector for
Connector for
adjustment
adjustment
Fig.1
Fig.1
Description
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