
17
X-HM81-K
5
6
7
8
5
6
7
8
A
B
C
D
E
F
• No Sound
(*1) The confirmation that is in a state of each sound source
Check the state of each sound source. (*1)
Yes
No
A sound does not come out
of FRONT SP
The sound from a source of CD,
USB, TUNER, iPod, LINE, F.AUX
does not come out.
• Check the IC602 and its peripheral circuits. (MAIN Assy)
• Check the MAIN MUTE circuit.
No
[Failure in the individual analog-signal paths]
• Check each input circuit part and each Assy.
• Failure in connection for volume IC (IC603).
• Check the IC603 and its peripheral circuits.
No
Yes -> Check the BCO system audio.
(USB/iPod/Ethernet/WIFI/BT)
• Check the IC208 and its peripheral circuits. (CNT2 Assy)
• Check the digital audio path between the CR870 (MODULE on BCO
Assy) and IC208.
• Replace the CR870 (MODULE on BCO Assy).
None of the audio of BCO system
outputs it.
• Check the input blocks and its peripheral circuits and power
supply
voltages.
• Replace the CR870 (MODULE on BCO Assy).
Output it depending on input
• Check the speaker realy. (MAIN Assy)
Yes
Does
a signal output it from
OP-AMP IC (IC602)
pin 1, 7?
• Check the IC608, IC612 and its peripheral circuits. (MAIN Assy)
• Check the Q621, Q623, Q640, Q641 and its peripheral circuits.
(MAIN Assy)
No
Yes
Does
a signal output it from
AMP IC (IC608, 612)
pin 13?
Does
the sound of CD, Analog
AUX, TUNER, LINE come
out?
Does
a signal output it from
DAC IC (IC208) pin 10,
11?
Check the IC315 and its peripheral circuits. (POWER Assy)
No
MAIN UCOM
Yes
Check the IC601 and its peripheral circuits. (MAIN Assy)
Is the
output voltage of the regulator
IC (IC315) for microcomputer power
supply 3.9 V?
• Check the D600. (MAIN Assy)
• Check connection between each Assy.
No
Yes
Is 3.3V supplied to
MAIN UCOM (IC601)?
Check the XTAL600 and its peripheral circuits. (MAIN Assy)
No
Yes
Does
the oscillator (XTAL600) for
MAIN UCOM (IC601) oscillate
it?
(POWER Assy)
(MAIN Assy)
(MAIN Assy)
(MAIN Assy)
(MAIN Assy)
(MAIN Assy)
(CNT2 Assy)
Does
the audio signal appear to
coupling condenser arround
volume IC (IC603)?