Diagnosis; Troubleshooting - Pioneer X-HM81-K Service Manual

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5. DIAGNOSIS

5.1 TROUBLESHOOTING

A
• No Power
Protect (protection history)
Does DC protect work?
No
B
Does POWER protect
work?
No
Does AMP protect
work?
No
Does
C
OVERTEMP1 protect
work?
No
Does
OVERTEMP2 protect
work?
No
Does PWM protect
work?
No
D
Does BT Protect
work?
No
Does USB protect
work?
No
E
F
16
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2
• Detection DC from AMP circuit.
Yes
Check the IC608, IC612 and its peripheral circuits. (MAIN Assy)
• Detection overvoltage on +B line.
Check the D307 and its peripheral circuits. (POWER Assy)
• Detection short-circuit on power supply circuits.
D307: B+_27V, B-_27V
Yes
IC305, IC307: AMP_+5V, AMP_-5V
IC315: MICOM_3V9
IC301, IC303: A_+12V, A_-12V
IC313: CD_3.3V
Check each IC mentioned above and peripheral circuits.
• Check workings of primary relay (RLY301).
• Check whether secondary fuse (FU302 to 305) does not perform blowout.
(POWER Assy)
Yes
• Detection abnormality of the AMP circuit.
Check the IC608, IC612 and its peripheral circuits. (MAIN Assy)
Yes
• Detection abnormal temperature of the AMP L ch circuit.
Check the IC608 and its peripheral circuits. (MAIN Assy)
Yes
• Detection abnormal temperature of the AMP R ch circuit.
Check the IC612 and its peripheral circuits. (MAIN Assy)
Yes
• Detection PWM abnormality output of the AMP circuit.
Check the IC608, IC612 and its peripheral circuits. (MAIN Assy)
X-HM81, XC-HM81 only
• Detection an overcurrent of Bluetooth power
Yes
Check the IC600 and its peripheral circuits.
Check the short-circuit of BT_+5V power (BT Assy).
• Detection an overcurrent of power of Front USB or iPod Dock.
Yes
Check the IC11 and IC14 and its peripheral circuits.
Check the short-circuit of 5V power of Front USB or iPod Dock
(BCO Assy/DOCKING Assy/F_USB Assy).
Be not the trouble that each Protect circuit works.
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X-HM81-K
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