General Information; Diagnosis; Diagnosis Method - Pioneer PDP-505HD Service Manual

PDP-505HD

7. GENERAL INFORMATION

7.1 DIAGNOSIS

7.1.1 DIAGNOSIS METHOD

This PDP has several protection circuits, and the operation of the
circuits activate power down circuit and set the unit automatically
to standby mode in order to protect the circuit.
Power shut down operation of the unit can roughly be diagnosed
by LED indicators at Main Power Assy.
Lighting of LEDs can be confirmed through five holes on Rear
Panel.
Diagnosis of malfunctions when power down occurs (in lighting LEDs at Main Power Assy)
The state of P.D. circuit
Lighting
LED circuit
in operation
High between
VSUS OVP
D407
base & emitter
of Q415
High between
VADR OVP
base & emitter
of Q417
High between
14V OVP
base & emitter
of Q419
D408 Anode is
VSUS UVP
High /
High between
base & emitter
of Q426
D408 Anode is
VADR UVP
High /
High between
base & emitter
of Q416
80
Diagnosis
When RCC Control (A) Assy is
replaced, P.D. does not occur.
When OTL Control(A) Assy is
replaced, P.D. does not occur.
Even when RCC Control(A)
Assy and OTL Control(A) Assy
are replaced, P.D occurs.
When RCC Control (B) Assy is
replaced, P.D. does not occur.
When OTL Control (B) Assy is
replaced, P.D. does not occur.
Even when RCC Control(B)
Assy and OTL Control (B) Assy
are replaced, P.D occurs.
When RCC Control (C) Assy is
replaced, P.D. does not occur.
When OTL Control(C) Assy is
replaced, P.D. does not occur.
Even when RCC Control (C)
Assy and OTL Control (C) Assy
are replaced, P.D occurs.
When CN205 is disconnected,
P.D. occurs, and when RCC
Control (A) Assy is replaced,
P.D. does not occur.
When CN205 is disconnected,
P.D. occurs, and when OTL
Control (A) Assy is replaced,
P.D. does not occur.
When CN205 is disconnected,
P.D. occurs, and even when
RCC Control (A) Assy and OTL
Control (A) Assy are replaced,
P.D occurs.
When CN3401 is disconnected,
P.D. does not occur.
When CN3601 is disconnected,
P.D. does not occur.
When CN205 is disconnected,
P.D. occurs, and when RCC
Control (B) Assy is replaced,
P.D. does not occur.
When CN205 is disconnected,
P.D. occurs, and when OTL
Control (B) Assy is replaced,
P.D. does not occur.
D407
Failure points Estimated failure parts
RCC Control (A) Assy IC203 • Q208 • R232 • D224 • 226
OTL Control (A) Assy IC204 • Q209 • 210 • R260
MAIN POWER Assy IC201 • 202
RCC Control (B) Assy IC303 • Q305 • R316 • 314
OTL Control (B) Assy IC304 • Q306 • 307 • R346
MAIN POWER Assy IC301 • 302
RCC Control (C) Assy IC353 • Q353 • R364 • D362 • 364
OTL Control (C) Assy IC354 • Q356 • 357 • R396
MAIN POWER Assy IC351 • 352
IC203 • Q208 • R232 • 254 • C221
RCC Control (A) Assy
OTL Control (A) Assy IC204 • Q209 • 210 • R260
IC201 • 202 • D212 • 214
MAIN POWER Assy
X DRIVE Assy Pulse module
IC3402 • 3405
Y DRIVE Assy Pulse module
IC3604 • 3609 • 3610
RCC Control (B) Assy IC303 • Q305 • R316 • 338 • D320 •
C317
OTL Control (B) Assy IC304 • Q306 • 307 • R346
D441
D443 D439
D437