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– 9 –

The special jig (J-2501-149-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be
performed are shown as follows.

GND : Ground
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP

: For measuring IOP (Check the deterioration of the optical pick-up laser)

TEO : TRK error signal (Traverse adjustment)
VC

: Reference level for checking the signal

RF

: RF signal (Check jitter)

RF
VC
TEO

For MDM-3

For MDM-5

IOP
I-3V

VC
RF
TEO
IOP
I+3V
GND

VC

RF

TEO

IOP

I+3V

GND

1

5

1

6

CN110

RF

5P connector

6P connector

VC

TEO

IOP

I+3V

GND

Mechanism deck

– 10 –

The IOP value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need
to look at the value on the label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC171 of BD board),
record the IOP value on the optical pick-up according to the following procedure.

Record Precedure:
1. With the power ON, press the  CD-MD SYNC  button while pressing the  

p  and  ENTER/YES  buttons together.

2. Rotate the  AMS  dial to display “Service”, and press the  ENTER/YES  button.
3. Rotate the  AMS  dial to display “lop.Write”, and press the  ENTER/YES  button.
4. The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
5. Input the IOP value written on the optical pick-up.

To select the number : Rotate the  AMS  dial.
To select the digit

: Press the  MD WALKMAN SYNC  button.

6. When the  ENTER/YES  button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).
7. As the adjustment results are recorded for the 6 value. Leave it as it is and press the  ENTER/YES  button.
8. “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop

Write”.

9. Press the  REPEAT/STEREO/MONO  button to complete.

Display Precedure:
1. With the power ON, press the  CD-MD SYNC  button while pressing the  

p  and  ENTER/YES  buttons together.

2. Rotate the  AMS  dial to display “Service”, and press the  YES  button.
3. Rotate the  AMS  dial to display “lop.Read”.
4. “@@.@/##.#” is displayed and the recorded contents are displayed.

@@.@ : indicates the Iop value labeled on the pick-up.
##.#

: indicates the Iop value after adjustment

5. To end, press the  MD WALKMAN SYNC  button or  MENU/NO  button to display “Iop Read”. Then press the  REPEAT/STEREO/

MONO  button.

– 11 –

• 0.9 mW power

Specified value : 0.84 to 0.92 mW

• 7.0 mW power

Specified value : 6.8 to 7.2 mW
lop (at 7mW)

• Labeled on the optical pickup

Iop value ± 10mA

• Traverse waveform

Specified value : Below 10% offset

• Error rate check

Specified value : For points a, b, and c
C1 error : Below 220
AD error : Below 2

• Error rate check

Specified value:
a. When using test disc (MDW-74/AU-1)

C1 error : Below 80
AD error : Below 2

b.When using check disc (TDYS-1)

C1 error : Below 50

• CPLAY error rate check

Specified value:
C1 error : Below 80
AD error : Below 2

• Unsatisfactory if displayed as T=@@ (##) NG”

NG
(@@, ## are both arbitrary numbers)

Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5 Electrical Adjustments”.

Laser power check
(7-6-2 : See page 29)

Traverse check
(7-6-3 : See page 29)
Focus bias check
(7-6-4 : See page 30)

C PLAY check
(7-6-5 : See page 30)

Self-recording/playback
check
(REC/PLAY)
(7-6-6 : See page 30)

TEMP check
(Temperature
compensation
offset check)
(7-6-1 : See page 29)

Criteria for Determination
(Unsatisfactory if specified value is not satisfied)

• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

• Replace the optical pick-up

If always unsatisfactory:
• Replace the overwrite head
• Check for disconnection of the circuits around the

overwrite head

If occasionally unsatisfactory:
• Check if the overwrite head is distorted
• Check the mechanism around the sled
• Check for disconnection of the circuits around D101

(BD board)

• Check the signals around IC101, IC121, CN102,

CN103 (BD board)

Measure if unsatisfactory:

The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for
adjustments.
When performing adjustments, use the specified values for adjustments.

The system microprocessor can be reset in the following procedure.
Use these procedure when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.
Procedure :
Disconnect the power plug, short-circuit both edge of BT921.

IC801

BT921

– 12 –

• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent indicator tube. During playback, the

“track mode” for obtaining track information will be set.
This is useful for locating the faulty part of the unit.

• The following will be displayed :

During recording and stop : Retry cause, number of retries, and number of retry errors.
During playback

: Information such as type of disc played, part played, copyright.

These are displayed in hexadecimal.

Precedure:
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the  FUNCTION  button and set the function to “MD”.
3. Press the  MENU/NO  button. When “Edit/Menu” is displayed on the fluorescent indicator tube, rotate the  AMS  dial to display “All

Erase?”.

4. Press the  ENTER/YES  button.
5. “All Erase??” is displayed on the fluorescent indicator tube.
6. Press the  ENTER/YES  button to display “Complete!!”, and press the  

p  button immediately. Wait for about 10 seconds while pressing

the button.

7. When the “TOC” displayed on the fluorescent display tube goes off, release the  

p  button.

8. Press the  REC (MD)  button to start recording. Then press the  

^/MD  button and start recording.

9. To check the “track mode”, press the  

^/MD  button to start play.

10. To exit the test mode, press the  

1/u  button, and turn OFF the power. When “TOC” disappears, disconnect the power plug from the

outlet. If the test mode cannot be exited, refer to “Forced Reset” on page 8.

} Address (Physical address on disc)

Hexadecimal

Bit

Binary

Higher Bits

Lower Bits

8

4

2

1

8

4

2

1

b7 b6 b5 b4 b3 b2 b1 b0

0

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

1

0

0

0

0

0

0

0

When track jump (shock) is detected

When ADER was counted more than five times

continuously

When ADIP address is not continuous

When DIN unlock is detected

When not in focus

When ABCD signal level exceeds the specified range

When CLV is unlocked

When access operation is not performed normally

Hexa-

decimal

shock

ader5

Discontinuous address

DIN unlock

FCS incorrect

IVR rec error

CLV unlock

Access fault

Cause of Retry

Occurring conditions

01

02

04

08

10

20

40

80

RTs@@c##c**

Fluorescent display tube display

@@ : Cause of retry
##

: Number of retries

**

: Number of retry errors

@@####**$$

Fluorescent display tube display

@@ : Parts No. (name of area named on TOC)
##

: Cluster

**

: Sector

$$

: Track mode (Track information such as copyright infor-

mation of each part)

Reading the Retry Cause Display

Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.

When 42 is displayed:
Higher bit : 4 = 0100 

n b6

Lower bit : 2 = 0010 

n b1

In this case, the retry cause is combined of “CLV unlock” and “ader5”.

When A2 is displayed:
Higher bit : A = 1010 

n b7+b5

Lower bit : 2 = 0010 

n b2

The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.