Pioneer X-HM81-K Service Manual page 18

1
A
A sound does not come out
of headphones
B
A sound does not come out
of SW PREOUT
• CD does not work
CD does not work (playback)
C
D
E
F
18
1
2
When you
No
connected HP, do hear the
working sound of the SP relay
(a snick sound)?
Yes
Does
a signal output it from No
HP AMP IC (IC605)
pin 1, 7?
(MAIN Assy)
Yes
Does
No
a signal output it from
OP-AMP IC (IC606)
pin 7?
(MAIN Assy)
Yes
Is FFC
No
to connect Pickup Assy and
CD Assy connected?
(CD Assy)
Yes
Is the
No
cable arranged neatly
arround CD tray section?
Yes
Is the
No
power supply voltage of
the BTL driver (IC1606)
8 V?
(CD Assy)
Yes
Is the power
No
supply voltage of the CD UCOM
(IC1604), CD DSP (IC1601)
3.3 V?
(CD Assy)
Yes
Does
No
the oscillator (X1602) for
CD UCOM oscillate it?
(CD Assy)
Yes
Does
No
the oscillator (X1601) for
CD DSP (IC1601) oscillate
it?
(CD Assy)
Yes
Does a
No
signal output it from CD DSP
(IC1601) pin 14
(DCLK)?
(CD Assy)
Yes
Is the signal
No
of CD UCOM (IC1604) pin 40
(CD RESET) "H"?
(CD Assy)
Yes
Is the signal
No
of CD UCOM (IC1604) pin 9
(8035 RESET) "H"?
(CD Assy)
Yes
Does signals
No
output from CD UCOM (IC1604)
pin 25, 27, 28 (MAIN_BUSY,
CD_RX, CD_TX)?
(CD Assy)
Yes
X-HM81-K
2
3
• Check the HP DET signal and its peripheral circuits.
• Check the IC605 and its peripheral circuits. (MAIN Assy)
• Check the HP MUTE circuit. (MAIN Assy)
• Check the connection between the MAIN Assy and F_AUX Assy.
• Check the IC606 and its peripheral circuits. (MAIN Assy)
• Check the SW MUTE circuit. (TUNER Assy)
• Check connection between each Assy.
• Check connection between each cable.
• Check whether a cable is arranged neatly.
(A cable do not touch a Disc rotate section)
• Check the IC311 and its peripheral circuits. (POWER Assy)
• Check the IC313 and its peripheral circuits. (POWER Assy)
• Check the IC1604, X1602 and its peripheral circuits. (CD Assy)
• Check the IC1601, X1601 and its peripheral circuits. (CD Assy)
• Check the IC1601, X1601 and its peripheral circuits. (CD Assy)
• Check the IC1604 and its peripheral circuits. (CD Assy)
• Check the IC601 pin 51 (CD RESET signal). (MAIN Assy)
• Check the IC1604 and its peripheral circuits. (CD Assy)
• Check the IC1604 and its peripheral circuits. (CD Assy)
• Check the IC1601, IC1606 and its peripheral circuits. (CD Assy)
3
4
4