Pioneer PDP-502MX Service Manual page 71

Procedure Adjusting Item
VSUS/VADR/
3
STB5V/+14V
Voltage adjustment
Note) Be sure to measure between specified test points.
VSUS UVP/+B
4
Voltage adjustment
Note) Normally, these adjustments are not needed in repair service. Adjust them only when VR is rotated by mistake
VFZ
5
Voltage adjustment
Note) Be sure to measure between specified test points.
5V/3.3V
6
Voltage adjustment
Note) Be sure to use a non-metallic screw driver such as a ceramic screw driver in the adjustment.
Input signal Adjusting Point
VR201 (VSUS)
MAIN POWER ASSY
White 100%
VR301 (VADR)
signal
MAIN POWER ASSY
VR111 (STB5V)
MAIN POWER ASSY
VR356 (+14V)
MAIN POWER ASSY
VR401 (VSUS UVP)
MAIN POWER ASSY
White 100%
signal
VR131 (+B)
MAIN POWER ASSY
and it needs to be re-adjusted.
Moreover, be sure to measure between specified test points in adjustment.
VR501 (VFZ)
Any input signal VF DD CONVERTER
ASSY
VR552 (5V)
DIGITAL VIDEO
ASSY
Any input signal
VR602 (3.3V)
DIGITAL
VIDEOASSY
If a metallic screw driver is used, DC/DC converter may operate wrongly.
Moreover, be sure to measure between specified test points.
PDP-502MX, PDP-502MXE
Adjusting Method
VSUS (Sustain voltage) adjustment
Adjust so that the voltage between TP201(VSUS) and TP202 (SUS
GND) becomes ±1V of the voltage indicated at the "voltage indication
label".
The symptom in case of mis-adjustment
If the VSUS adjustment is not performed properly, dots like blinking
luminance points appear. If deviated greatly from the right adjustment
point, Panel will stop lighting.
VADR (Address voltage) adjustment
Adjust so that the voltage between TP301(VADR) and TP302 (ADR
GND) becomes "59V±0.5V".
The symptom in case of mis-adjustment
If the VADR adjustment is not performed properly, dots like blinking
luminance points appear. If deviated greatly from the right
adjustment point, Panel will light white.
STB5V adjustment
Adjust so that the voltage between TP111(STB5V) and TP113(STB
GND) becomes "+5V ± 0.1V".
+14V adjustment
Adjust so that the voltage between TP355(+14V) and TP356
(AGND) becomes "+14V ± 0.1V".
VSUS UVP adjustment
Adjust so that the voltage between TP404 (V1) and TP405 (V2)
becomes "0V ± 10mV".
+B Voltage adjustment
Adjust so that the voltage between TP131 (+B) and TP132 (P. GND)
becomes "+380V ± 1.0V".
VFZ Voltage adjustment
Adjust so that the voltage between Pin 9 (VFZ+) and Pin 10 (VFZ–) of
connector CN354 P3 in MAIN POWER Assy becomes "12V ± 0.1V".
+5V adjustment
Adjust so that the voltage between TP553 (5V) and TP554 (DGND)
becomes "+5V ± 0.05V".
+3.3V adjustment
Adjust so that the voltage between TP601 (3.3V) and TP602 (DGND)
becomes "3.3V ± 0.05V".
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