Pioneer PDP-427XD - 5.2.2 PD (POWER-DOWN) FAILURE SYMPTOMS AND DIAGNOSIS

PDP-427XD
94
1234
1234
C
D
F
A
B
E
5.2.2 DIAGNOSIS OF THE PD (POWER-DOWN)
Prediction of failure symptoms when a PD (power-down) is generated
How to distinguish which connector is disconnected
LED Flashing
Count
PD Circuit Checkpoint Main Cause
2 Power supply PD POWER SUPPLY Unit
Failure in the POWER SUPPLY Unit
3 SCAN PD
SCAN A, B Assy SCAN IC is damaged (short-circuiting between VH and GNDH)
Y DRIVE Assy
Connectors disconnected between the POWER SUPPLY Unit and the Y DRIVE Assy
Connectors disconnected between the DIGITAL and the Y DRIVE Assys
Failure in the VH power
4 IC5V PD
SCAN A, B Assy
SCAN IC is damaged (short-circuiting between IC5V and GNDH)
Disconnection of the scan-bridge (15-pin) connector
Y DRIVE Assy
Failure in the photo coupler
Abnormality in the IC5V DC/DC converter
5 Y-DRIVE PD Y DRIVE Assy Abnormality in the 16.5 V power
6Y DCDC PD Y DRIVE Assy
Abnormality in the VOFS DC/DC converter
Abnormality in the VPRST DC/DC converter
Abnormality in VC_15V DC/DC converter
7Y SUS PD Y DRIVE Assy
Abnormality in the DK module
Abnormality in the control signal line
8 Address PD ADDRESS Assy
Short-circuiting of Vadr
TCP damaged
9 X-DRIVE PD X DRIVE Assy
Connectors disconnected between the DIGITAL and the X DRIVE Assys
Abnormality in the 16.5 V power
10 X DCDC PD X DRIVE Assy
Abnormality in VC_15V power
Abnormality in VXNRST power
11 X SUS PD X DRIVE Assy
Abnormality in the DK module
Abnormality in the control signal line
Connectors disconnected between the POWER SUPPLY Unit and the X DRIVE Assy
Assy Connector
To which Assy the Connector
is Connected
Frequency of LED
Flashing
Screen Display
X DRIVE Assy
CN1001 DIGITAL Assy 11 (XDRIVE)
–
CN1204 POWER SUPPLY Unit (ADR system power)
–
White (left half of the screen)
CN1206 POWER SUPPLY Unit (drive system power) 12 (X-SUS)
–
CN1201,
CN1202,
CN1203,
CN1205
ADDRESS Assy 8 (ADR)
–
Y DRIVE Assy
CN2001 DIGITAL Assy 3 (SCAN)
–
CN2351 POWER SUPPLY Unit (drive system power) 3 (SCAN)
–
CN2353 POWER SUPPLY Unit (ADR system power)
–
White (right half of the screen)
CN2354,
CN2355,
CN2356,
CN2357
ADDRESS Assy 8 (ADR)
–
CN2401,
CN2402
SCAN A, B Assy 4 (SCN-5V)
–
SCAN A, B Assy
CN2701,
CN2801
Y DRIVE Assy 4 (SCN-5V)
–
ADDRESS Assy
CN1502,
CN1702
DIGITAL Assy 8 (ADRS)
–
CN1501,
CN1701
X DRIVE Assy,
Y DRIVE Assy
8 (ADRS)
–