Flowchart Of Failure Analysis For The Main Assy - Pioneer PDP-5000EX Service Manual

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5.1.5 FLOWCHART OF FAILURE ANALYSIS FOR THE MAIN ASSY

Flowchart of Failure Analysis for The MAIN Assy (1)
A
Failure analysis for the
MAIN Assy. ⇒ MA1
The STB LED does not light although
STB 3.3 V power is supplied.
Is the M2 connector securely
connected?
Yes
Is the cable that is connected to
B
the M2 connector broken?
Yes
Is resetting of the IF
microcomputer canceled?
Yes
Is the voltage at Pin 1 of the M7
connector high?
Yes
Is the M7 connector securely
connected?
Yes
C
Is the cable that is connected to
the M7 connector broken?
Yes
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 on the
MAIN Assy high (3.3 V)?
Yes
E
Is the power (1.8 V, 3.3 V) supplied
to the main microcomputer?
Yes
F
Replace the MAIN Assy.
76
1
2
No
Securely connect the M2 connector.
No
Replace the cable (J114: ADX3307).
No
Replace the MAIN Assy.
No
Replace the MAIN Assy.
No
Securely connect the M7 connector.
No
Replace the cable (J121).
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
Can the unit be turned on, using
RS-232C commands?
Yes
No
Replace the MAIN Assy.
If the voltage at Pin 129 (RST3 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-5000EX
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 IR and RS232C+SR Assys.
No
Replace the cable that connects the
KEY CONTROL and RS232C+SR Assys.
No
Replace the RS232C+SR Assy.
Failure in the RS-232C driver and its
peripheral circuits
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 RS232C+SR and MAIN Assys.
NG
Replace the MAIN Assy.
NG
Replace the cable that connects
the RS232C+SR and MAIN Assys.
NG
Replace the IR Assy.
NG
Replace the cable that connects
the KEY CONTROL and KEY Assys.
NG
Replace the KEY CONTROL Assy.
If the symptom does not improve,
replace the KEY Assy.
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