Symptom Individual symptom Possible causes Defect location, countermeasures
3 CD-related CD loading is not possible. Defective +7 V CD motor power supply Confirmation of the +7 V power supply of the POWER
circuit board
Check that approx. +7 V is applied to C19 on the MAIN
circuit board.
Defective CD unit CD unit re
lacement
CD ejection is not possible. Defective wiring of the CD eject button Confirmation of the wiring between MAIN and CDOPSW
circuit board
Confirmation of the wiring between CDOPSW circuit
board and EJECT circuit board
Defective wirin
between MAIN and CD unit Connection confirmation
FFC cable re
lacement
The CD is not reco
nized correctl
. Defective wirin
between MAIN and CD unit Connection confirmation
FFC cable re
lacement
Defective CD control signal IC3, IC5, IC21, IC22, IC27, and IC29 on the MAIN
circuit board and their surroundings
Defective media microcom
uter IC34 on the MAIN circuit board and its surroundin
s
Defective CD unit CD unit re
lacement
The CD does not turn. Defective +7 V CD motor power supply Confirmation of the +7 V power supply of the POWER
circuit board
Check that approx. +7 V is applied to C19 on the MAIN
circuit board.
Defective CD unit CD unit re
lacement
The shutter does not o
en and close. Defective shutter motor Shutter motor and its surroundin
s
Defective motor drive circuit Q2, Q3, Q10, and Q11 on the MAIN circuit board and
their surroundings
Defective connection between MAIN and
CDOPSW circuit board
Confirmation of the wiring between MAIN and CDOPSW
circuit board
Confirmation of the wiring between CDOPSW and motor
Defective shutter open/close detection switch Defective SW2301, SW2302 on the CDOPSW circuit
board
Recording of CD title information is not
possible.
Defective record EEROM IC16 on the MAIN circuit board and its surroundings
4 SD-related No reco
nition Defective SD lid o
en/close detection switch SW1 on the MAIN circuit board and its surroundin
s
Defective SD I/F IC IC17 and CN4 on the MAIN circuit board and their
surroundings
Defective SD key writing SD key rewriting
Reading is not possible. Defective SD I/F IC IC17, CN4, and Q4 on the MAIN circuit board and their
surroundings
Defective operation of the microcomputer on
the media side
IC34 on the MAIN circuit board and its surroundings
5 Turntable-related No turning Defective connection between MAIN and
JACK circuit board
Connection confirmation, FFC cable replacement
Pay attention to the orientation.
Defective connection between JACK and
MOTOR circuit board
Connection confirmation, cable replacement
Defective motor control IC IC2003 and IC2005 on the JACK circuit board and their
surroundings
Defective rotation pulse output IC2 and CN7 on the MAIN circuit board and their
surroundings
JACK circuit board IC2003
Defective motor start signal output IC2 and CN7 on the MAIN circuit board and their
surroundings
JIC2003 and Q2010 on the JACK circuit board and their
surroundings
Defective motor Motor circuit board re
lacement
Unwanted rotation at the time of power
supply start
Defective +3.3 V microcomputer power supply Confirmation of the +3.3 V power supply of the POWER
circuit board
Check that +3.3 V is applied to C14 on the MAIN circuit
board.
Defective connection between MAIN and
JACK circuit board
Connection confirmation, FFC cable replacement
Pay attention to the orientation.
Defective switching signal Q2003 on the JACK circuit board and its surroundings
Defective connection of the forward/reverse
switch
Confirmation of the connection between CP2 and CP3
Bad brake effectiveness Defective motor control IC IC2003 and IC2005 on the JACK circuit board and their
surroundings
The turntable turns, but no audio is
heard.
Defective rotation detection sensor SENSOR circuit board SENSOR replacement
Confirm lighting of the SENSOR LED.
Defective connection between SENSOR and
relay circuit board
Connection confirmation, cable replacement
Irregular rotation Defective rotation detection FG circuit IC2003 and Q2009 on the JACK circuit board and their
surroundings
Defective motor control IC IC2003 and IC2005 on the JACK circuit board and their
surroundings
Vacillation of the stroboscope with -50%
slow rotation
Defective motor torque switching circuit IC2007, IC2008, Q2019, and Q2020 on the JACK circuit
board and their surroundings
The shutter motor operates
continuously.
Forward/reverse switching is not
possible.
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