PDP-502MX
76
IC203 • Q208 • R232 • D224 • 226
IC204 • Q209 • 210 • R260
IC201 • 202
IC303 • Q305 • R316 • 314
IC304 • Q306 • 307 • R346
IC301 • 302
IC353 • Q353 • R364 • D362 • 364
IC354 • Q356 • 357 • R396
IC351 • 352
IC203 • Q208 • R232 • 254 • C221
IC204 • Q209 • 210 • R260
IC201 • 202 • D212 • 214
Pulse module
IC3454 • 3459 • 3460
Pulse module
IC3604 • 3609 • 3610
IC303 • Q305 • R316 • 338 • D320 •
C317
IC304 • Q306 • 307 • R346
High between
base & emitter
of Q415
High between
base & emitter
of Q417
High between
base & emitter
of Q419
D408 Anode is
High /
High between
base & emitter
of Q426
D408 Anode is
High /
High between
base & emitter
of Q416
VSUS OVP
VADR OVP
14V OVP
VSUS UVP
VADR UVP
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 CN3451 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.
RCC Control (A) Assy
OTL Control (A) Assy
MAIN POWER Assy
RCC Control (B) Assy
OTL Control (B) Assy
MAIN POWER Assy
RCC Control (C) Assy
OTL Control (C) Assy
MAIN POWER Assy
RCC Control (A) Assy
OTL Control (A) Assy
MAIN POWER Assy
X DRIVE Assy
Y DRIVE Assy
RCC Control (B) Assy
OTL Control (B) Assy
7.1 DIAGNOSIS
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.
7. GENERAL INFORMATION
D441
D439
D437
D443
D407
Diagnosis of malfunctions when power down occurs (in lighting LEDs at Main Power Assy)
D407
7.1.1DIAGNOSIS METHOD
The state of
circuit
P.D. circuit
in operation
Diagnosis Failure points
Estimated failure parts
Lighting
LED
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