Pioneer PDP-V401 Field Service Manual page 11

Procedure Adjustment
5 VRN, VH voltage
adjustment
DIP SW setting of
6
the pulse value
Sustain pulse
7
waveform
adjustment
Factory data setting
8
White balance
9
adjustment
Input Signal Adjusting Point
VR4002 (VRN)
(X DRIVE (A)
All white 100% signal
Assy)
VR5002 (VH)
(Y DRIVE (A)
Assy)
S6603
––––––
(DIGITAL VIDEO
Assy)
VR6551
(XSUS-U)
VR6552
(YSUS-U)
All white 100% signal
VR6553
(XSUS-D)
VR6554
(YSUS-D)
(DIGITAL VIDEO
Assy)
Memory data
––––––
(CONTROL
ASSY)
Adjust based on the "6.3 WHITE BALANCE ADJUSTMENT". After adjusting,
––––––
memorize the setting.
11
Adjusting Method
V (minus reset power supply voltage)
RN
Check the drive voltage label value at the top inside the unit,
adjust VR4002 so that value between TP4021 (VRN) and
TP4022 (RNGND) becomes this value.
V (scan IC power supply voltage) (Note 1)
H
Check the drive voltage label value at the top inside the unit,
adjust VR5002 so that value between TP5035 (VHY) and TP5034
(GNDH) becomes this value.
Note: When the V voltage adjustment is not performed properly,
RN
dot-like blinking luminance points appear. If deviated
greatly from the right adjustment, PDP will stop discharging.
When the V voltage adjustment is not performed properly,
H
dot-like blinking luminance points appear. If deviated
greatly from the right adjustment, these will become white.
Check the pulse value when replacing the DIGITAL VIDEO
ASSY and set the data again for the new Assy with the DIP SW.
Note: If set incorrectly, the number of drive pulses generated will
change, and affect the brightness of the screen. PD
operates if the power consumption exceeds the normal
level.
Check the waveforme shown in Fig.4 at TP4027 (XPSUS),
TP4012 (XPSUS) on the X DRIVE (A) ASSY and X DRIVE (B)
ASSY, TP5004 (YPSUS), TP5002 (YPSUS) on the Y DRIVE (A)
ASSY and Y DRIVE (B) ASSY, then look at the waveform of the
scanned portion, and find the sub field with sustain emission
(refer to Note 2: Sustain emission.)
Enlarge the waveform of the sustain pulse portion shown in Fig.
4 in the sub field with sustain emission, and adjust as shown in
Fig. 5. If not adjusted properly, the slanting portion and base
portion will distort as shown in Fig. 6 and Fig. 7.
Enlarge this portion, and check that this
is the sub field with sustain emission
Typical sub field
adjustment
for Y P.SUS
Reset portion Scanned portion
Fig. 4
Fig. 5 Fig. 6
Note: When the adjustment is not performed properly, dot-like
blinking luminance points will increase.
When replacing the CONTROL ASSY, read the following data
before ASSY replacement.
1) picture quality, white balance, phase data
2) HOUR METER data (Panel operating time from shipment)
Set the above data again for the new ASSY using the RS232C
command.
PDP-V402
Enlarge this
portion and
adjust the pulse
width
Sustain pulse portion
Fig. 7
147