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– 17 –

1. After power supply, the microcomputer (ICD01) built in this

model consecutively monitors the following errors 

1

 to 

4

.

If any error occurs, "Er_AP00" is displayed and all power
supply except for the one to drive the microcomputer is
interrupted.

1

 Abnormal output voltage drop of each regulator

(below approx. 3 V)

2

 Excessive output offset of 1-bit amplifier

(over approx. 2 V of DC potential)
POWER OFF after "Err_AP02" displayed

3

 Excessive main supply current of 1-bit amplifier

(over DC approx. 5.5 A)

4

 When 1 bit + BAMP voltage is over 23 V, "Err_AP03" is

     displayed for POWER OFF. (Check during power ON.)

2. Criteria for judging errors of built-in microcomputer and

checking/cancelling detection line
Condition: Abnormalities are detected according to the

voltage of Pin 91(PROTECT) of microcomputer.

Caution: When interrupting the PROTECT detection line,

the microcomputer does not operate protectively.
In case of an error caused by output short-circuit
of each regulator, components and board on the
spot may be burnt. Do not interrupt the PROTECT
detection line of the microcomputer, if any cause
other than the above mentioned is not identified.
(For approx. 0.5 seconds after error detection,
power is supplied; power supply can be checked
with an oscilloscope, etc. As leading and trailing
edges of the voltage are so steep that the power
supply cannot be checked by the tester.)

1

Connect the measuring apparatus (oscilloscope, etc.) to
the stabilized output of the regulator to turn on the unit
power switch.
If the stabilized output is far smaller (below approx. 3 V)
than that shown in the circuit diagram, the regulator and
the circuit to be supplied with the power may be defective.

2

After disconnecting the BIA110 (speaker output connector
of 1-bit amplifier), turn on the unit power for the normal
operation. (No sound is heard from the speaker.)

* After repair, adjust 1-bit amplifier output-offset voltage.

If protected operation is still observed after removal of

BIA110, circuits Q460 ~ Q463 (for detecting speaker
output DC voltage) may be abnormal.

3

After disconnecting the BIA111 (main power source
connector of 1-bit amplifier), turn on the unit power for the
normal operation. (No sound is heard from the speaker.)

* After repair, adjust 1-bit amplifier output-offset voltage.

If protected operation is still observed after removal of
BIA111, circuits IC570 and IC571 (for detecting power
supply current) may be abnormal.

– 18 –

Outline: Read-out of the set value after automatic adjustment (for judging difference from initial value)

Forced operation of pickup (Inner/Outer circumference feed)
During the PLAY mode, the number of errors accumulated for 1 second (75 frames) is displayed.

When the unit enters the CD test mode,
1) Direct power on by the CD function button
2) Initial processing to DSP
3) Command transmission to each button

Authorization buttons :

CD PLAY, CDSTOP, CD FAST FORWARD, CD FAST REVERSE, ON/STAND-BY, DISPLAY,
VOLUME UP,VOLUME DOWN

1. CD-PLAY:

CD operation according to steps
STEP 1: LD ON by pressing CD PLAY button in the stop mode
STEP 2: Focus ON by pressing CD PLAY button in STEP 1
STEP 3: CLV servo ON by pressing CD PLAY button in STEP 2
STEP 4: Tracking servo ON by pressing CD PLAY button in STEP 3
STEP 5: Sub-code read-out/display by pressing CD PLAY button in STEP 4
* Keep pressing the CD PLAY button for more than 1 second to shift to STEP 5 directly.

2. CD STOP:

To stop the playback operation (shifting from each step to the stop mode)/
To reset display (during display of coefficient)

3. CD FAST FORWARD (TUNING   / 

 ):

Forcible shift in the pickup FWD direction

4. CD FAST REVERSE (TUNING   / 

 ):

Forcible shift in the pickup REV direction
Sliding is stopped when the PU_IN switch is turned on.

5. ON/STAND-BY:

Cancelling the test mode

6. DISPLAY(REMOTE CONTROL):

To read the coefficient register while the CD operation is stopped/
To display the error number during CD playback

7. VOLUME UP/DOWN:

Normal volume control

From power off state to TEST mode
Press the VOLUME DOWN button and CD FAST FORWARD button ( 

 ) simultaneously while the ON/STAND-BY button of

the main unit is on to obtain the TEST mode. Initially, the version is displayed.
Thereafter press the CD FAST FORWARD/REVERSE ( 

 )  ( 

 ) to select the TEST mode and then press the TUNER

(BAND) button  to determine it.
Press the DIRECT key during version display to obtain the designated TEST mode directly.

1

CD TEST

CD PLAY

CD

2

KEY TEST

VOLUME UP

KEY

3

TUNER TEST

TUNER (BAND)

TUN

4

CD MECHA TEST

CD STOP/EJECT

MECHA

1. In each TEST mode, press the ON/STAND-BY button to display COMPLETE for 1 second and then cancel the TEST mode.
2. If a power failure occurs, cancel the test mode and write in irregular data for RAM check in order to reset the unit after the power
    is restored.

– 19 –

Press the DISPLAY button during the stop mode to read the following items.
Press the CD STOP button to return to the normal display.

Focus balance

_ _ F B : 

× ×

7 F

0 0

8 0

Focus gain

_ _ F G : 

× ×

1 F

0 0

E 0

Tracking balance

_ _ T B : 

× ×

7 F

0 0

8 0

Tracking gain

_ _ T G : 

× ×

1 F

0 0

E 0

Focus offset

F O F F : 

× ×

7 F

0 0

8 0

Tracking offset

T O F F : 

× ×

7 F

0 0

8 0

RFRP

R F R P : 

× ×

7 F

0 0

8 0

After the register is configured by D4XX (FTBAST), it is read by 2XX (SRC2).

Cumulative number of errors per second (75 frames) is displayed by pressing the DISPLAY button during playback.
Procedures
1. PRCSET command (9188) is sent. EC/FC=H
2. BUS2 is monitored in the idle mode and, in "H" status (sub code readable), number of errors per frame will be counted
    by the read command (SRC6).
3. This operation is repeated 75 times and cumulative counts will be displayed. A display should be updated every 75 frames.
4. If the DISPLAY button is pressed when ERR is showing, a display returns to the normal test mode.

Pressing the E-START and VOLUME buttons simultaneously enables the key test mode.
"KEY OFF" turns off all lights.
Segments corresponding to each KEY light up.

a. Directly enters the tuner function.
b. Writes in the following preset stations.
c. Tunes in to the preset 1.
d. The ON/STAND-BY button cancels the test mode.
    Deletes all presets.

AUX

[TUNER]

VOLUME UP

kHz

VOLUME DOWN

MHz

CD PLAY

PLAY

CD STOP

[CD]

CD FAST FORWARD

STEREO

CD FAST REVERSE

RANDOM

M1

87.5

M2

108.0

M3

90.0

M4

106.0

M5

98.0

M6

522k

M7

1620k

M8

603k

M9

1404k

M10

990k

– 20 –

Purpose:

An operational check and aging test of disc loading mechanism

Functions: Manual control of a loading/mechanism up/down motor

Loading/eject control
Aging test with TOC reading
Aging test w/o TOC reading
Error display due to abnormal aging test results

Operation: By entering operations assigned only to this test mode, each mode processes its operation.

Manual control mode: Manually controls mechanism according to the operation entered.
  Normal and reverse rotations of a loading motor
  Normal and reverse rotations of a mechanism up/down motor
  Loading/eject control
Aging mode with TOC reading: Repeatedly performs loading/TOC reading/ejection.
  Displays number of times. Maximum test counts are 100,000.
Aging mode w/o TOC reading: Performs loading/ejection only to test mechanism aging.
   Displays number of times. Maximum test counts are 100,000.
Errors should be handled according to normal procedures.

Mode diagram:
By pressing the specified buttons, the unit enters the manual control mode and then the mechanism test mode.

Test mode initial display
"IX***V****"

Mode select display
"MECHA        "

Mechanism test manual 
control mode
"MECHA     :         "

Aging mode w/o TOC 
reading
"L/E  N000000"

Testing mechanism 
aging w/o TOC reading
"L/E  N                      "

Currently in the mechanism 
aging mode w/o TOC reading
"L/E  N                      "

Aging mode with TOC reading
"LIE  N000000"

[CD STOP/EJECT]

[ERASE/BAND] ([BAND])

[Mode]

[Mode]

[Mode]

[CD PLAY]

[CD PLAY]

[CD STOP/EJECT]

[CD STOP/EJECT]