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Symptom

Individual symptom

Possible causes

Defect location, countermeasures

6 Output-related

No audio output for LINE OUT and
headphone

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 amplifier

IC35 on the MAIN circuit board and its surroundings

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
headphone

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 amplifier

IC2004 on the JACK circuit board and its surroundings

No sound from LINE OUT L

Defective Lch MUTE circuit

Q2016 on the JACK circuit board and its surroundings

Defective LINE OUT amplifier

IC2004 on the JACK circuit board and its surroundings

No sound from LINE OUT R

Defective Rch MUTE circuit

Q2015 on the JACK circuit board and its surroundings

Defective LINE OUT amplifier

IC2004 on the JACK circuit board and its surroundings

Defective headphone amplifier

IC2002, Q2004, Q2005, Q2006, and Q2007 on the
JACK circuit board and their surroundings

No sound from the left headphone

Defective Lch MUTE circuit

Q2018 on the JACK circuit board and its surroundings

Defective headphone amplifier

IC2002, Q2004, and Q2005 on the JACK circuit board
and their surroundings

No sound from the right headphone

Defective Rch MUTE circuit

Q2017 on the JACK circuit board and its surroundings

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 replacement

No reaction of LCD panel buttons

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 CP1 and CP3

Connection confirmation, FFC cable replacement

Defective connection between CP1 and CP5

Connection confirmation, cable replacement

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 replacement

Defective connection between CP1and CP5

Connection confirmation, cable replacement

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)

33

    

    

Start by switching on the power while pressing EXECUTE, SAMPLE PAD3 for the finished product.
Select the following pages with the buttons (||<< and >>||) at the lower part of the LCD.

    

    

Press the [TEST] button: ROM/RAM/E2PROM diagnosis and CD/SD interface diagnosis is performed and OK/NG is displayed
on the LCD.
ROM/RAM shows the ROM/RAM contents of SC&MDadded outside the microcomputer. CD/SD means sending a signal to the
unit and receiving an answer.

    

    

Insert a CD: The first title of the CD automatically starts to play.

→

Signal confirmation at LINE OUT.

    

    

Press the start button with a CD inserted or after inserting a CD. Perform TT forward with tempo ±0.

→

Visually confirm that the

stroboscope is stopped.

    

    

All LEDs flash with entry to this page. Return to normal condition by real-time REC button operation or escape to page 1.

34

    

    

Set the brake to the maximum for FAST and press the start button with a CD inserted. (Please Wait is displayed for some time.)
Press the [FAST] button when steady rotation has been reached.

→

The TT count from pressing [FAST]until complete stop is

measured and the value is displayed on the LCD.
Next, set to the maximum for SLOW, press the start button, and then press the [SLOW] button in the same way to display the
respective results on the LCD. (SLOW inspection ispossible only after FAST has been performed once.)
Judgment standard: [FAST] Within 80 degrees (TT count values 15858) OK, [SLOW] Angle difference from FAST within 60
degrees (count value 11894 or more) OK

    

    

Tempo reset is done automatically with entry to this page.

    

    

Press the start button with a CD inserted, move the tempo slider sequentially to 0, +50%, and -50%, and press [TEST].
(Perform this operation manually. This also serves for inspection of the slider itself).At this time, automatic counting is
performed on the inside (a measuring time of TT 1.5 revolutions each is required), and when the upper and lower limit range
set in advance is not exceeded, OK is displayed on the LCD, while NG is displayed when therange is exceeded

→

Phase

deviation (DP value) within 12 between MAX and MIN.

For the measuring of page 3, it is required to wait until the TT speed has stabilized before the [TEST] button is pressed.

    

    

At the same time, the cogging deviation width also is displayed on the LCD. (OK/NG display also is performed if upper and lower
limit have been decided.)

    

    

When the tempo slider is not set to ±50% or 0% and if tempo reset is not in ON condition, measuring does not start even when
[TEST] is pressed.

→

In case of NG, a defect of the shaft in case of a mechanical fault, a defective servo constant in case of an electrical defect, or

defective parts can be assumed.

35

    

    

Press [TEST] to start the inspection.

    

    

Each time a switch on the control panel is pressed, the LED near the switch lights, so that the operation can be confirmed.

    

    

Each time all switches on the control panel, the mode switch on the rear, CD-EJECT at the front, or the front SD lid are
operated,The inspected items are counted up on the LCD, and when all operations have been completed,the LEDs on the
PADpart light as shown on the right to indicate completion.

    

    

Lighting of all LEDs can be confirmed with the real-time REC switch.

Switches with two states become OK with operation through both states. (Play selection CD/SD, TT direction lever, SD lid). The
tempo slider has to be moved only once.
The brake VOL and headphone VOL on the rear cannot be recognized bythe microcomputer and are not inspection objects.

    

    

Press [TEST] to start the inspection.

    

    

The LCD display is changed with the two switches at the lower part of the LCD. (<< >>)

→

(||<<. >>||) on both sides are switches for page switching in the sameway as for the other pages, and this should be noted.

36