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Symptom
Individual symptom
6 Output-related
No audio output for LINE OUT and
headphone
Distorted output to LINE OUT and
headphone
No sound from LINE OUT L, R
No sound from LINE OUT L
No sound from LINE OUT R
No sound from the headphone or low
volume
No sound from the left headphone
No sound from the right headphone
No digital output (there is analog output)
There is digital output, but copying is not
possible.
Large shock sound at the time of power
ON/OFF
7 Switch- and button-
No reaction from any switch or button
related
No reaction of LCD panel buttons
No reaction by a specific button
8 Link operation
No link operation
SL-DZ1200PP / SL-DZ1200EB / SL-DZ1200EG / SL-DZ1200EP / SL-DZ1200GN
Possible causes
Defective +15 V, -15 V power supply
Defective MUTE circuit
Defective audio DAC
Defective audio amplifier
Defective audio clock circuit
Defective +15 V, -15 V power supply
Defective three-terminal regulator for the
audio DAC
Defective LINE OUT amplifier
Defective Lch MUTE circuit
Defective LINE OUT amplifier
Defective Rch MUTE circuit
Defective LINE OUT amplifier
Defective headphone amplifier
Defective Lch MUTE circuit
Defective headphone amplifier
Defective Rch MUTE circuit
Defective headphone amplifier
Defective digital audio IC
Defective digital output circuit system
Defective digital IC modification (initial
product)
Defective digital IC modification (initial
product)
Defective MUTE circuit
Defective operation of the UI microcomputer
Defective connection between MAIN and CP1
Defective operation of the UI microcomputer
Defective connection between MAIN and CP1 Connection confirmation, FFC cable replacement
Defective connection between CP1 and CP3
Defective connection between CP1 and CP5
Defective operation of the UI microcomputer
Defective connection between MAIN and CP1 Connection confirmation, FFC cable replacement
Defective connection between CP1and CP3
Defective connection between CP1and CP5
Defective operation of the UI microcomputer
Defective diode parts
33
Defect location, countermeasures
Confirmation of +15 V and -15 V power supply on the
POWER circuit board
Q2001, Q2002, Q2012, Q2013, Q2014, Q2015, Q2016,
Q2017, and Q2018 on the JACK circuit board and their
surroundings
IC33 and IC18 on the MAIN circuit board and their
surroundings
Confirm that +5 V is put out for the output of IC18.
IC35 on the MAIN circuit board and its surroundings
X6 and IC32 on the MAIN circuit board and their
surroundings
Confirm that 11.2989 MHz is oscillated.
Confirmation of +15 V and -15 V power supply on the
POWER circuit board
IC18 on the MAIN circuit board and its surroundings
IC2004 on the JACK circuit board and its surroundings
Q2016 on the JACK circuit board and its surroundings
IC2004 on the JACK circuit board and its surroundings
Q2015 on the JACK circuit board and its surroundings
IC2004 on the JACK circuit board and its surroundings
IC2002, Q2004, Q2005, Q2006, and Q2007 on the
JACK circuit board and their surroundings
Q2018 on the JACK circuit board and its surroundings
IC2002, Q2004, and Q2005 on the JACK circuit board
and their surroundings
Q2017 on the JACK circuit board and its surroundings
IC2002, Q2006, and Q2007 on the JACK circuit board
and their surroundings
IC4 on the MAIN circuit board and its surroundings
IC15 on the MAIN circuit board and its surroundings
IC2006 on the JACK circuit board and its surroundings
Confirmation of the GND connection of P10, P23, and
P24 on the IC4 MAIN circuit board
Confirmation of the GND connection of P10, P23, and
P24 on the IC4 MAIN circuit board
Q2001, Q2002, Q2012, Q2013, Q2014, Q2015, Q2016,
Q2017, and Q2018 on the JACK circuit board and their
surroundings
IC2 on the MAIN circuit board and its surroundings
Connection confirmation, FFC cable replacement
IC2 on the MAIN circuit board and its surroundings
Connection confirmation, FFC cable replacement
Connection confirmation, cable replacement
IC2 on the MAIN circuit board and its surroundings
Connection confirmation, FFC cable replacement
Connection confirmation, cable replacement
IC2 on the MAIN circuit board and its surroundings
Replacement of D2004, D2005, D2006, and D2007 on
the JACK circuit board
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