Pioneer PDP-V401 Field Service Manual page 30

Symptom: Shuts down after 6 seconds. Gives no display.
Cure: Y Drive B board PD (power down) test point went high just before the unit shut down, but the problem was in one
of the scan boards connected to Y Drive A board. Troubleshoot by unplugging the scan assemblies one at a time. You
must leave power off at least a minute before reconnecting the scan board to allow charge to dissipate.
Models Covered: PDP501MX, PDPV501X
Tip Date: October 10 2000
The Tech Name: Bernie Shelton
Symptom: When replacing the protective panel, page 8, #4,
Cure: you must also replace the "Panel Cushions" and "Shield Gaskets" because the are sticky and can't be removed
from the old protective panel.
Models Covered: PDP501, PDPV501
Tip Date: May 12 2000
The Tech Name: Bernie Shelton
Symptom: Troubleshooting procedure for P.D.
Cure: Check for PD pulse at Power Supply connectors- P4 pin 8 (Temp_PD), P12 pin 5 (X Drv A), P12 pin 7 (X Drv B), P6
pin 8 (Y Drv A), and P6 pin 10 (Y Drv B). (P2 pin 9 is labeled PD AU, but is not connected to anything on the U -CON
Assy.)
Models Covered: PDP501MX, PDPV501X
Tip Date: December 20 1999
The Tech Name: Dennis Walden
Symptom: When replacing the U-Com Assy AWV1689, some original PCB's did not have a connector for E15 (3 wires
from Side Sw Assy). The wires may be soldered to the PCB.
Cure: The new PCB is different. There are 3 solder pads located next to E13 connector labeled Blue Wire, White Wire,
and Red wire.
Models Covered: PDP501MX, PDPV501
Tip Date: December 14 1999
The Tech Name: Dennis Walden
Symptom: Power LED comes on in Green when main pwr is applied, but no video or OSD.
Cure: Listen for noise level of unit to drop after a few seconds. Unit is shutting down. Troubleshooting in s/m is
incorrect. Display LED will not blink. See Diagnosis on page 83 and PD Block on page 85.
Models Covered: PDP501MX, PDPV501X
Tip Date: December 01 1999
The Tech Name: Dennis Walden
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