Power Down Of Failure Analysis; Fflashing Of The Red Led - Pioneer PDP-5000EX Service Manual

1

5.2.2 POWER DOWN OF FAILURE ANALYSIS

PD (Power-down) diagnosis
A
Prediction of failure symptoms when a PD (power-down) is generated
LED Flashing
PD Circuit
Count
2 Power supply PD
3 SCAN PD
B
4 IC5V PD
5 Y-DRIVE PD
6 Y DCDC PD
7 Y SUS PD
C
8 Address PD
9 X-DRIVE PD
10 X DCDC PD
11 X SUS PD
• List of detection of disconnected connectors
D
Assy Name
CN1001
CN1204
X DRIVE
CN1206
CN1201, CN1202, CN1203, CN1205
CN2001
CN2351
Y DRIVE CN2353
CN2354, CN2355, CN2356, CN2357
CN2401, CN2402
E
SCAN CN2701, CN2801
CN1502, CN1702
ADDRESS
CN1501, CN1701
F
82
1
2
Checkpoint
Failure in the POWER SUPPLY Unit
POWER SUPPLY Unit
X, Y DRIVE Assy MSK_MOD is damaged (short-circuiting between VS and GND)
Each Assy 16.5V/ 12V/ 6.5V/ 5.1V short-circuit within one of PCB.
SCAN Assy SCAN IC is damaged (short-circuiting between VH and GNDH)
Connectors disconnected between the POWER SUPPLY Unit and the Y DRIVE Assy
Y DRIVE Assy Connectors disconnected between the DIGITAL and the Y DRIVE Assys
Failure in the VH power
SCAN IC is damaged (short-circuiting between IC5V and GNDH)
SCAN Assy
Disconnection of the scan-bridge (15-pin) connector
Failure in the photo coupler
Y DRIVE Assy
Abnormality in the IC5V DC/DC converter
Y DRIVE Assy Abnormality in the 16.5 V power
MSK_MOD is damaged (short-circuiting of the mask switch)
Abnormality in the VOFS DC/DC converter
Y DRIVE Assy
Abnormality in the VPRST DC/DC converter
Abnormality in VC_15V DC/DC converter
Abnormality in the DK module
Y DRIVE Assy
Abnormality in the control signal line
Short-circuiting of Vadr
ADDRESS Assy
TCP damaged
Connectors disconnected between the DIGITAL and the X DRIVE Assys
X DRIVE Assy
Abnormality in the 16.5 V power
Abnormality in VC_15V power
X DRIVE Assy
Abnormality in VXNRST power
Abnormality in the DK module
X DRIVE Assy Abnormality in the control signal line
Connectors disconnected between the POWER SUPPLY Unit and the X DRIVE Assy
Connector
FHD DIGITAL Assy
POWER SUPPLY Unit (ADR system) −
POWER SUPPLY Unit (drive system) 12 (X-SUS)
ADDRESS Assy
FHD DIGITAL Assy
POWER SUPPLY Unit (drive system) 3 (SCAN)
POWER SUPPLY Unit (ADR system) −
ADDRESS Assy
SCAN Assy
Y DRIVE Assy
FHD DIGITAL Assy
X/Y DRIVE Assy
PDP-5000EX
2
3
Main Cause
Connection Assy
LED flashes
11 (X DRIVE)
8 (ADR)
3 (SCAN)
8 (ADR)
4 (SCN-5V)
4 (SCN-5V)
8 (ADRS)
8 (ADRS)
3
4
Number of
Screen Display
White screen
White screen
4