Pd (Power Down) Diagnosis - Pioneer PDP-4271HD Service Manual

5

5.2.2 PD (POWER DOWN) DIAGNOSIS

Prediction of failure symptoms when a PD (power-down) is generated
LED Flashing
PD Circuit
Count
2 Power supply PD
3 SCAN PD
4 IC5V PD
5 Y-DRIVE PD
6 Y DCDC PD
7 Y SUS PD
8 Address PD
9 X-DRIVE PD
10 X DCDC PD
11 X SUS PD
How to distinguish which connector is disconnected
Assy Connector
CN1001
CN1201
CN1201
X DRIVE Assy
CN1203
CN2001
CN2350
CN2350
CN2351,
Y DRIVE Assy
CN2352
CN2401,
CN2402
CN2701,
SCAN A, B Assy
CN2801
CN1501
ADDRESS Assy
CN1502,
CN1502
5
6
Checkpoint
POWER SUPPLY Unit Failure in the POWER SUPPLY Unit
SCAN A, B 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 A, B 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
Abnormality in the VOFS DC/DC converter
Abnormality in the VPRST DC/DC converter
Y DRIVE Assy
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
To which Assy the Connector
is Connected
DIGITAL Assy
POWER SUPPLY Unit (ADR system power)
POWER SUPPLY Unit (drive system power)
ADDRESS Assy
DIGITAL Assy
POWER SUPPLY Unit (drive system power)
POWER SUPPLY Unit (ADR system power)
ADDRESS Assy
SCAN A, B Assy
Y DRIVE Assy
DIGITAL Assy
X DRIVE Assy,
Y DRIVE Assy
6
7
Main Cause
Frequency of LED
Flashing
11 (XDRIVE)
–
12 (X-SUS)
8 (ADR)
3 (SCAN)
3 (SCAN)
–
8 (ADR)
4 (SCN-5V)
4 (SCN-5V)
8 (ADRS)
8 (ADRS)
PDP-4271HD
7
8
Screen Display
–
White (left half of the screen)
–
–
–
–
White (right half of the screen)
–
–
–
–
–
97
8
A
B
C
D
E
F