Main Assy - Pioneer PDP-5010FD Service Manual

5

5.2.5 MAIN ASSY

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.
Does the POWER switch on?
Yes
Is resetting of the IF
microcomputer canceled?
Yes
Is the voltage at Pin 3 of the M11
connector High?
Yes
Is the M11 connector securely
connected?
Yes
Is the cable that is connected to
the M11 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.
Does the POWER switch on?
Yes
Is the voltage at Pin 3 of the M1
connector 3.3 V?
Yes
Are the voltages (3.3 V/2.5 V/1.5 V)
supplied to the main microcomputer?
Yes
Is voltage at REQ_IF on the MAIN
Assy High (3.3 V)?
Yes
Replace the MAIN Assy.
5
6
No
Turn the POWER switch on.
No
Replace the MAIN Assy.
No
Replace the MAIN Assy.
No
Securely connect the M11 connector.
Yes
Replace the cable (J115).
No
Turn the POWER switch on.
No
Replace the MAIN Assy.
No
Replace the MAIN Assy.
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 unit?
Yes
Can the unit be turned on, using
RS-232C commands?
Failure in the Main microcomputer.
6
7
Failure in the RST IC (IC8302) output or its peripheral circuits
Failure in the line between the IF microcomputer and M11 connector
Relay control is unable unless it supplies a power supply to the module microcompute.
• Failure in the output of REG IC (IC4501).
• Is active low?
No Replace the cable that connects
between the IR and MAIN Assys.
No
Replace the cable that connects
between the SIDE KEY and MAIN Assys.
No
Replace the MAIN Assy.
Failure in the RS-232C driver and its
peripheral circuits
PDP-5010FD
7
8
No
Replace the IR Assy.
No
Replace the MAIN Assy.
No
Replace the SIDE KEY Assy.
No
Replace the MAIN Assy.
8
A
B
C
D
E
F
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