Pioneer PDP-502MX Service Manual page 61

The state of
Lighting P.D. circuit
LED
circuit in operation
D408 Anode is VADR UVP
D407
High/ High
between base &
emitter of Q416
D408 Anode is 14V UVP
High/ High
between base &
emitter of Q418
D408 Anode is 12V UVP
High/ High
between base &
emitter of Q421
D408 Anode is 8V UVP
High/ High
between base &
emitter of Q420
D408 Anode is –8V UVP
High/ High
between base &
emitter of Q435
B OVP
D405 Anode is
High
High between AC200V P.D.
base & emitter
of Q111
D852 Anode is VF OVP
High.
TP555 Hi 5V OVP
D407
•
TP556 Hi 5V UVP
D443
TP604 Hi 3.3V OVP
TP603 Hi 3.3V UVP
ICP OPEN
TP555 Lo
TP556 Lo
TP603 Lo
TP604 Lo
D4501 Anode is High. AUDIO P.D.
D3457 Anode is 12V OCP
D407
High.
•
D441
K706Hi VOFS OVP
D407
•
D439
K705Hi VOFS UVP
VH OVP
K754Hi
Diagnosis
When CN205 is disconnected,
P.D. occurs, and even when
RCC Control (B) Assy and OTL
Control (B) Assy are replaced,
P.D occurs.
When CN205 is disconnected,
P.D. does not occur.
When CN306 & 354 are
disconnected, P.D. occurs.
When CN306 is disconnected,
P.D. does not occur.
When CN354 is disconnected,
P.D. does not occur.
When CN355 is disconnected,
P.D. occurs.
When CN356 is disconnected,
P.D. does not occur.
When CN306 is disconnected,
P.D. occurs.
When CN306 is disconnected,
P.D. does not occur.
When CN306 is disconnected,
P.D. occurs.
When CN306 is disconnected,
P.D. does not occur.
AC power input is appropriate.
When the power supply is
turned on, a part of the screen
shines in white momentarily and
P.D. occurs.
Drive section (drive control
signals & drive signal output
elements) in normal operation.
VOFS D/D Conv. Block in
normal operation
PDP-502MX, PDP-502MXE
Failure points
MAIN POWER Assy IC301 • 302 • Q302
CABLE Assy
MAIN POWER Assy RCC Control (C) Assy • OTL
14V D/D CONV. BLOCK Control (C) Assy • IC351 • 352
ANALOG VIDEO Assy
Y DRIVE Assy IC852
IC5V D/D CONV. BLOCK
MAIN POWER Assy RCC Control (C) Assy • OTL
12V D/D CONV. BLOCK Control (C) Assy • IC351 • 352
IC551 • 601 • Q554 • 555 • 604 • 605
DIGITAL VIDEO Assy
D/D CONV. BLOCK
MAIN POWER Assy RCC Control (C) Assy • OTL
8V D/D CONV. BLOCK Control (C) Assy • IC351 • 352
ANALOG VIDEO Assy
MAIN POWER Assy RCC Control (C) Assy • OTL
–8V D/D CONV. BLOCK Control (C) Assy • IC351 • 352 •
D373
ANALOG VIDEO Assy
MAIN POWER Assy IC131
PFC BLOCK
MAIN POWER Assy IC111 • 112 • 113 • T111
STB BLOCK
Y DRIVE Assy IC852 • 853 • 854
DIGITAL VIDEO Assy IC551
5V D/D CONV.BLOCK
DIGITAL VIDEO Assy IC601
3.3V D/D CONV. BLOCK
CABLE Assy IC1008 • Q1001–Q1006
RESONATOR BLOCK
Address Module UPD16340 (IC??????)
DIGITAL VIDEO Assy IC2201
DIGITAL BLOCK
AUDIO Assy IC4502 • C4520 • 4522
X DRIVE Assy Pulse module
Pulse Module IC3402 • 3405
X DRIVE Assy Q3401 • 3402 • 3403
RESET DRIVE BLOCK
Y DRIVE Assy IC702 • 704
VOFS D/D CONV. BLOCK
Y DRIVE Assy IC701 • 702 • 704
VOFS D/D CONV. BLOCK
Y DRIVE Assy R3717 • 3730
SUS_MSK BLOCK
Y DRIVE Assy IC751 • 752
VH D/D CONV. BLOCK
Estimated failure parts
61