4.2. No sound is output from the headphones, or noise occurs
Is there any abnormality below?
MAIN PCB [PWM modulator PWM signal]
IC40 : TAS5558
1pin(PWM_HPM_L)
2pin(PWM_HPP_L)
3pin(PWM_HPM_R)
4pin(PWM_HPP_R)
5. Cannot Play CDs
NO
Is there any abnormality below?
MAIN PCB
C438 : - Terminal (-12V)
C439 : + Terminal (+12V)
NO
Is there any abnormality below?
MAIN PCB [Analog audio signal]
C468 : - Terminal (HP Rch)
C467 : - Terminal (HP Lch)
NO
Is there any abnormality below?
MAIN PCB [Analog audio signal]
CN10 : 2pin(HP_R), 5pin(HP_L)
NO
Is there any abnormality below?
HP PCB [Analog audio signal]
JK11 : 2pin(H/P_L), 3pin(H/P_R)
Is the HP PCB abnormal?
Are there abnormalities in the circuit where HP_
DET is connected?
Is [
JK11 : 1pin(HP_DET)
] "
Lo
" when headphones
are inserted?
NO
There is an abnormality in the communica-
tion between PWM modulator TAS5558[
IC40
],
TAS5558[
IC40
] and MCU[
IC20
], or in the sur-
rounding circuits.
Check for abnormalities and repair them.
YES
Check for abnormalities in the MUTE circuit or the
surrounding circuits and repair them.
MUTE circuit: [
Q211, Q212, Q213, Q214
]
YES
Check for abnormalities in [
BN10
] or the sur-
rounding circuits and repair them.
YES
Check for abnormalities in [
JK11
] or the sur-round-
ing circuits and repair them.
YES
Check for abnormalities in [
IC41
] or the sur-round-
ing circuits and repair them.
YES
The circuits around [
Q238
,
Q240
] or the SMPS
power supply circuit may be malfunctioning.
Repair the part where the abnormality is occur-
ring or check each part according to the area from
"
YES
".
YES
Check the CD PCB CDDSP.
IC83 : 2pin, 25pin, 41pin(A+3.3V), 43pin, 44pin,
50pin(D+3.3V), 32pin, 51pin, 71pin,
74pin(+1.5V)
Check the CD PCB Motor driver.
IC81 : 4pin, 7pin, 8pin, 20pin(+8V_DRV)
Is CD PCB CD DSP[
IC83 : 69pin(RESET)
] "
Hi
"?
NO
NO
Does the disc rotate during TOC reading (the
process in which the disc is placed in the tray
and the information is read)?
Try TOC reading (the process in which the disc
is placed in the tray and the information is read)
several times. Is reading successful every time?
YES
Is the RF waveform abnormal? (Refer to waveform
diagram)
YES
Is there any abnormality below?
CD PCB
[CD DSP Digital audio signal (SPDIF)]
IC83 :
33pin(CD_SPDIF)
YES
Is there any abnormality below?
MAIN PCB
[DIR1 Digital audio signal (SPDIF)]
IC37 : 31pin(CD_SPDIF)
NO
The MAIN PCB [
IC24
]+3.3VD, CD PCB [
IC84
]+1.5VD
or SMPS power supply circuit may be malfunction-
ing.
Repair the part where the abnormality is occur-
ring or check each part according to the area from
"
YES
".
YES
The CDDSP [
IC83
], MCU [
IC20
] or the circuit
around the MCU may be malfunctioning.
Check for abnormalities and repair them.
YES
CDDSP [
IC83
], Motor Driver [
IC81
] or the sur-
rounding circuits may be malfunctioning.
Check for abnormalities and repair them or re-
place CDDSP PCB.
NO
The CD Mecha or CD PCB may be malfunc-tion-
ing.
Replace the malfunctioning part.
NO
The CD Mecha or CD PCB may be malfunc-tioning.
Replace the malfunctioning part.
NO
Check for abnormalities in the signal path be-
tween CD PCB CDDSP[
IC37
] and MAIN PCB PWM
simulator TAS5558[
IC40
], and repair them.
YES
Check for abnormalities in the signal path be-
tween CD DSP PCB[
WF80
] and MAIN PCB
DIR1[
IC37
], and repair them.
YES
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
51
