Symptom Individual symptom Possible causes Defect location, countermeasures
6 Output-related No audio output for LINE OUT and
head
hone
Defective +15 V, -15 V power supply Confirmation of +15 V and -15 V power supply on the
POWER circuit board
Defective MUTE circuit Q2001, Q2002, Q2012, Q2013, Q2014, Q2015, Q2016,
Q2017, and Q2018 on the JACK circuit board and their
surroundings
Defective audio DAC IC33 and IC18 on the MAIN circuit board and their
surroundings
Confirm that +5 V is put out for the output of IC18.
Defective audio am
lifier IC35 on the MAIN circuit board and its surroundin
s
Defective audio clock circuit X6 and IC32 on the MAIN circuit board and their
surroundings
Confirm that 11.2989 MHz is oscillated.
Distorted output to LINE OUT and
head
hone
Defective +15 V, -15 V power supply Confirmation of +15 V and -15 V power supply on the
POWER circuit board
Defective three-terminal regulator for the
audio DAC
IC18 on the MAIN circuit board and its surroundings
No sound from LINE OUT L
R Defective LINE OUT am
lifier IC2004 on the JACK circuit board and its surroundin
s
No sound from LINE OUT L Defective Lch MUTE circuit Q2016 on the JACK circuit board and its surroundin
s
Defective LINE OUT am
lifier IC2004 on the JACK circuit board and its surroundin
s
No sound from LINE OUT R Defective Rch MUTE circuit Q2015 on the JACK circuit board and its surroundin
s
Defective LINE OUT am
lifier IC2004 on the JACK circuit board and its surroundin
s
Defective headphone amplifier IC2002, Q2004, Q2005, Q2006, and Q2007 on the
JACK circuit board and their surroundings
No sound from the left head
hone Defective Lch MUTE circuit Q2018 on the JACK circuit board and its surroundin
s
Defective headphone amplifier IC2002, Q2004, and Q2005 on the JACK circuit board
and their surroundings
No sound from the ri
ht head
hone Defective Rch MUTE circuit Q2017 on the JACK circuit board and its surroundin
s
Defective headphone amplifier IC2002, Q2006, and Q2007 on the JACK circuit board
and their surroundings
Defective digital audio IC IC4 on the MAIN circuit board and its surroundings
Defective digital output circuit system IC15 on the MAIN circuit board and its surroundings
IC2006 on the JACK circuit board and its surroundings
Defective digital IC modification (initial
product)
Confirmation of the GND connection of P10, P23, and
P24 on the IC4 MAIN circuit board
There is digital output, but copying is not
possible.
Defective digital IC modification (initial
product)
Confirmation of the GND connection of P10, P23, and
P24 on the IC4 MAIN circuit board
Large shock sound at the time of power
ON/OFF
Defective MUTE circuit Q2001, Q2002, Q2012, Q2013, Q2014, Q2015, Q2016,
Q2017, and Q2018 on the JACK circuit board and their
surroundings
7 Switch- and button-
related
No reaction from any switch or button Defective operation of the UI microcomputer IC2 on the MAIN circuit board and its surroundings
Connection confirmation
FFC cable re
lacement
No reaction of LCD
anel buttons Defective o
eration of the UI microcom
uter IC2 on the MAIN circuit board and its surroundin
s
Defective connection between MAIN and CP1 Connection confirmation, FFC cable replacement
Defective connection between CP1 and CP3 Connection confirmation
FFC cable re
lacement
Defective connection between CP1 and CP5 Connection confirmation
cable re
lacement
No reaction by a specific button Defective operation of the UI microcomputer IC2 on the MAIN circuit board and its surroundings
Defective connection between MAIN and CP1 Connection confirmation, FFC cable replacement
Defective connection between CP1and CP3 Connection confirmation
FFC cable re
lacement
Defective connection between CP1and CP5 Connection confirmation
cable re
lacement
8 Link operation No link operation Defective operation of the UI microcomputer IC2 on the MAIN circuit board and its surroundings
Defective diode parts Replacement of D2004, D2005, D2006, and D2007 on
the JACK circuit board
Defective connection between MAIN and CP1
No sound from the headphone or low
volume
No digital output (there is analog output)
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