Flowchart Of Failure Analysis For The Main Assy - Pioneer PDP-4270XA Service Manual

1

5.1.5 FLOWCHART OF FAILURE ANALYSIS FOR THE MAIN ASSY

A
Flowchart of Failure Analysis for The MAIN Assy
Failure analysis for the
MAIN Assy. ⇒ MA1
The STB LED does not light although
STB 3.3 V power is supplied.
Is the M1 connector securely
connected?
Yes
B
Is the cable that is connected to
the M1 connector broken?
No
Is resetting of the IF
microcomputer canceled?
Yes
Is the voltage at Pin 1 of the M5
connector high?
Yes
Is the M5 connector securely
connected?
Yes
C
Is the cable that is connected to
the M5 connector broken?
No
No problem with the MAIN Assy.
Check the LED Assy.
Failure analysis for the
MAIN Assy. ⇒ MA2
The RELAY port does not work.
The power is not turned on.
D
Is voltage at REQ_IF (3.3 V) on
the MAIN Assy high?
Yes
E
Is the power (1.8 V, 3.3 V) supplied
to the main microcomputer?
F
Yes
Replace the MAIN Assy.
82
1
2
No
Securely connect the M1 connector.
Yes
Replace the cable (J207).
No
Replace the MAIN Assy.
No
Replace the MAIN Assy.
No
Securely connect the M5 connector.
Yes
Replace the cable (J113).
No
Can the unit be turned on, using
the remote control unit?
Yes
Can the unit be turned on, using
the Power switch on the main unit?
Yes
No
Replace the MAIN Assy.
If the voltage at Pin 129 (RST2 port) on the main
microcomputer is high, it is judged that the AC power
cord is not plugged in, and operation of the unit will stop there.
PDP-427XD
2
3
Failure in the RST IC (IC4801) output or its peripheral circuits
Failure in the line between the IF microcomputer and M7 connector
No
Can the unit be turned on, using
the Power switch on the main unit?
Yes
Replace the cable that connects
the LED IR and MAIN Assys.
No
Replace the cable that connects
the SIDE KEY and MAIN Assys.
Replace the MAIN Assy.
• Failure in the REC IC (IC4402) and PM SW (IC4407) outputs
• Does the voltage remain low even though it should be active?
• A shutdown, indicated by 9 flashes of LED, will be established in 20 seconds.
3
4
No
Replace the cable that connects
the SIDE KEY and MAIN Assys.
NG
Replace the MAIN Assy.
NG
Replace the cable that connects
the LED IR and MAIN Assys.
NG
Replace the LED IR Assy.
NG
Replace the cable that connects
the SIDE KEY and MAIN Assys.
NG
Replace the SIDE KEY Assy.
4
NG