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3.  Display-related 

4.  CD-related

5.  SD-related

No LCD display

Can CD audio
etc. be heard?

No

Defect related to the SC

microcomputer

There is the possibility of a defective

connection in the LCD wiring.

Yes

The LED does not

light.

Is the operation of
all switches without
problems?

No

Defect related to the UI

microcomputer

There is the possibility of a defective

intermediate connection.

Yes

The CD is not

recognized.

Defect related to the

SC/MD microcomputer

Defective intermediate

connection

Defective power supply

circuit

Defective CD unit

The CD cannot be ejected.

Defective EJECT SW

Defective intermediate

connection

Defective shutter operation

Defective shutter

switch

Defective shutter

motor

The SD is not

recognized.

Defective SD

connector

Defective I/F IC

Defective MD

microcompute

29

6.  Turntable-related

7.  Related to the audio output

1.  There are three microcomputers.

The panel operates when UI is running.

2.  MD also is OK when updating from SD is possible.
3.  SC/MD operation judgment and sensor judgment can be made by turntable/CD mode switching.
4.  Confirm the power supply if the system is unstable.
5.  Use test mode.
6.  As the panels are connected in the order of CP1 --> CP5 --> CP3, confirm the preceding one.
7.  For analog trouble, confirmation with a test CD (sine wave) is faster as the circuit is simple.

When the LED of the PAD button flashes when "REALTIME REC" is pressed while the power is on, SC also is OK.

8.  CD and SD have different connections to the MD microcomputer, but the signal flow after the input is in common.

Defective rotation

Defective motor

controller IC

Defective motor driver

IC

Confirmation of the

MAIN control signal

There is rotation, but no

sound.

Defective turntable

sensor part

AD signal output is not

possible.

Defective DAC IC

Defective operation

amplifier power supply

Defective MUTE circuit

Can sound be
heard in CD
mode?

No

Yes

Defective audio circuit

Is the LCD TIME
display moving?

No

Yes

Defect related to the

SC/MD microcomputer

30

** The following fault symptoms assume that a product which operated perfectly at the time of shipping has become defective.

Symptom

Individual symptom

Possible causes

Defect location, countermeasures

1

The power cannot be switched on at all. Blown fuse

Replace the fuse on the POWER circuit board.

None of the power supplies is put out.

IC1150 and D1140 on the POWER circuit board and
their surroundings

+1.8 V is not put out.

IC20 and D2 on the MAIN circuit board and their
surroundings
Check that +1.8 V is applied to C13 on the MAIN circuit
board.

The +3.3 V power supply is not put out.

IC1410 and L1271 on the POWER circuit board and
their surroundings
POWER circuit board fuse protector FP1400

The +5 V power supply is not put out.

IC1302 and D1261 on the POWER circuit board and
their surroundings
Check that +5 V is applied to C15 on the MAIN circuit
board.

The +7 V power supply is not put out.

POWER circuit board D1261
Check that +7 V is applied to C19 on the MAIN circuit
board.

The +15 V power supply is not put out.

IC1201 on the POWER circuit board and its
surroundings
Power circuit board resistor R1211

The +20 V power supply is not put out.

D1271 on the POWER circuit board and its
surroundings

The -15 V power supply is not put out.

D1403 on the POWER circuit board and its
surroundings

Microcomputer-related defect

IC2, IC14, and IC34 on the MAIN circuit board and their
surroundings

Defective connection between MAIN-JACK
circuit board and POWER-JACK circuit board

Confirmation of the connection cable
Pay attention to the orientation.

Defective oscillation circuit

X1, X3, X5 on the MAIN circuit board and their

surroundings
Confirm that X1 oscillates at 8 MHz and X3 and X5 at
27 MHz.

Defective reset circuit

IC6 and IC11 on the MAIN circuit board and their
surroundings
Output of +5 V for the output of IC6 on the MAIN circuit
board and output of +3.3 V for the output of IC11

Memory-related defects

IC23, IC24, IC25, IC36, and IC38 on the MAIN circuit
board

2 Display-related

Nothing is displayed on the LCD.

Defective connection between MAIN and LCD

relay circuit board

Connection confirmation, connecting cable replacement

Defective connection between relay circuit
board and LCD

Connection confirmation, FFC cable replacement

Defective LCD control circuit

IC1, IC9, and IC13 on the MAIN circuit board and their
surroundings

Defective contrast -15 V power supply

IC12, Q7, and Q8 on the MAIN circuit board and their
surroundings
Confirm that approximately -10 V to -13 V is put out to
C6 on the MAIN circuit board.

Defective LCD unit

Replacement of the LCD unit

Defective microcomputer on the scratch side

IC14 on the MAIN circuit board and its surroundings

Dark LCD

Defective backlight power supply

IC8 on the MAIN circuit board and its surroundings
Confirm that +5 V is put out for the output of IC8.

Defective backlight LED in the LCD

Replacement of the LCD unit

Wire break in the FFC cable of the LCD
circuit board

Replacement of the LCD unit or the FFC cable

The LCD display shows incorrect
characters.

Defective connection between relay circuit
board and LCD

Connection confirmation, FFC cable replacement

Defective LCD control circuit

IC1, IC9, and IC13 on the MAIN circuit board and their
surroundings

Defective LCD unit

Replacement of the LCD unit

Some or all LEDs do not light.

Defective LED parts

Replacement of the respective LEDs

Defective connection between MAIN and CP

Connection confirmation, FFC cable replacement

Defective connection between CP1 and CP3

Connection confirmation, FFC cable replacement

Defective connection between CP1 and CP5

Connection confirmation, cable replacement

Defective LED decoding circuit on the CP
circuit board

IC3101, IC3102, IC3103, IC3104, Q3101, Q3102,
Q3103, and Q3104 on the CP circuit board and their
surroundings

Defective operation of the UI microcomputer

IC2 on the MAIN circuit board and its surroundings

Related to the
power supply

Each power supply is normal, but there
is no operation.

31

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 replacement

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 wiring between MAIN and CD unit

Connection confirmation, FFC cable replacement

The CD is not recognized correctly.

Defective wiring between MAIN and CD unit

Connection confirmation, FFC cable replacement

Defective CD control signal

IC3, IC5, IC21, IC22, IC27, and IC29 on the MAIN

circuit board and their surroundings

Defective media microcomputer

IC34 on the MAIN circuit board and its surroundings

Defective CD unit

CD unit replacement

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 replacement

The shutter does not open and close.

Defective shutter motor

Shutter motor and its surroundings

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 recognition

Defective SD lid open/close detection switch

SW1 on the MAIN circuit board and its surroundings

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 replacement

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.

32