Flowchart Of Failure Analysis For The Main Block Assy - Pioneer krp-m01 Service Manual

1
A
[3] MAIN BLOCK ASSY

Flowchart of Failure Analysis for The MAIN BLOCK Assy

Failure analysis for the
MAIN BLOCK Assy => MA1
The STB LED does not light although
STB 3.4 V power is supplied.
Is resetting of the IF
B
microcomputer (pin 10) canceled?
Yes
Is the voltage at Pin 13 of the M2
connector High?
Yes
Is the M2 connector securely
connected?
Yes
Is the cable that is connected to
the M2 connector broken?
No
C
No problem with the MAIN BLOCK
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
Are the voltages (1.5 V/2.5 V/3.4 V)
supplied to the main microcomputer?
Yes
Is voltage at REQ_IF (TP6830) on
the MAIN BLOCK Assy High
(3.4 V)?
Yes
E
Replace the MAIN BLOCK Assy.
F
38
1
2
No
Replace the MAIN BLOCK Assy.
No
Replace the MAIN BLOCK Assy.
No
Securely connect the M2 connector.
Yes
Replace the cable (J112).
No
Replace the MAIN BLOCK 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?
KRP-M01
2
3
Failure in the RST IC (IC6801) output or its peripheral circuits.
Failure in the line between the IF microcomputer and M2 connector.
Replace the system cable that
No
connects between the Display and
MAIN BLOCK Assy (MR).
No
Replace the cable (J112) that
connects between the KEY, LED
and MAIN BLOCK Assys.
No
Replace the 50P cable (J203) that
connects between the REAR_IO
and MAIN BLOCK Assys.
3
4
NG
Replace the MAIN BLOCK Assy.
NG
Replace the KEY Assy.
NG
Replace the MAIN BLOCK Assy.
NG
Replace the REAR_IO Assy.
NG
Replace the MAIN BLOCK Assy.
4