PDP-5000EX
76
1234
1234
C
D
F
A
B
E
5.1.5 FLOWCHART OF FAILURE ANALYSIS FOR THE MAIN ASSY
Flowchart of Failure Analysis for The MAIN Assy (1)
Failure in the RST IC (IC4801) output or its peripheral circuits
No
No
No
Yes
Yes
Replace the MAIN Assy.
Is the M2 connector securely
connected?
Is the cable that is connected to
the M2 connector broken?
The STB LED does not light although
STB 3.3 V power is supplied.
Securely connect the M2 connector.
No
Is the M7 connector securely
connected?
Securely connect the M7 connector.
Replace the cable (J114: ADX3307).
No
Yes
Is the cable that is connected to
the M7 connector broken?
Replace the cable (J121).
No
No
No
No
No
No
NG
NG
The RELAY port does not work.
The power is not turned on.
Is voltage at REQ_IF on the
MAIN Assy high (3.3 V)?
Is the power (1.8 V, 3.3 V) supplied
to the main microcomputer?
Can the unit be turned on, using
the remote control unit?
Can the unit be turned on, using
the Power switch on the main unit?
Can the unit be turned on, using
the Power switch on the main unit?
Can the unit be turned on, using
RS-232C commands?
Replace the cable that connects
the RS232C+SR and MAIN Assys.
Yes
Is resetting of the IF
microcomputer canceled?
Failure in the line between the IF microcomputer and M7 connector
Failure in the RS-232C driver and its
peripheral circuits
If the symptom does not improve,
replace the KEY 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.
• 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.
No
Replace the MAIN Assy.
Replace the MAIN Assy.
Yes
Is the voltage at Pin 1 of the M7
connector high?
No problem with the MAIN Assy.
Check the LED Assy.
Yes
Yes
Yes
Yes
Yes
Yes
NG
Replace the cable that connects
the RS232C+SR and MAIN Assys.
Replace the cable that connects
the IR and RS232C+SR Assys.
Replace the cable that connects the
KEY CONTROL and RS232C+SR Assys.
Replace the IR Assy.
NG
Replace the cable that connects
the KEY CONTROL and KEY Assys.
Replace the KEY CONTROL Assy.
Replace the MAIN Assy.
Replace the MAIN Assy.
Replace the MAIN Assy.
Replace the RS232C+SR Assy.
NG
Yes
Failure analysis for the
MAIN Assy. ⇒ MA1
Failure analysis for the
MAIN Assy. ⇒ MA2
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