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8

• In checking the MD mechanism deck section (MDM-7X2A), prepare two extension jigs (Part No. J-2501-100-A: 1.00 mm 27 core and

Part No. J-2501-198-A: 1.00 mm 17 core).

• In checking the CD mechanism deck section (CDM55A-21BD53), prepare extension jig (Part No. J-2501-075-A: 1.00 mm 21 core.)

MD mechanism deck section
(MDM-7X2A)

CN103

BD (MD) board

CD mechanism deck section
(CDM55A-21BD53)

Connect extension jig (J-2501-198-A) to the
BD (MD) board (CN103) and MD DIGITAL board (CN1004).

Connect extension jig (J-2501-100-A) to the
BD (MD) board (CN102) and MD DIGITAL board (CN1003).

CN1004

CN1003

CN101

BD (CD) board

CN1005

CN1002

MD DIGITAL board

Connect extension jig (J-2501-075-A) 
to the BD (CD) board (CN101) and 
MD DIGITAL board (CN1002).

CN1005

Pin 

2

 (GND)

Pin 

3

 (OUTSW)

CN102

harness

In performing the operation check with the CD mechanism deck section removed from the main unit, the CD disc loading will be disabled if
the connector cable between MD DIGITAL board (CN1005) and LOADING board (CN151) is disconnected. Accordingly, make preparation
through the following steps.
1. Insert the CD disc for test with the set assembled.
2. Unplug the AC power cord to turn the power off, and remove the CD mechanism deck section. (Disconnect the connector cable between

MD DIGITAL board (CN1005) and LOADING board (CN151), and also the connector cable between MD DIGITAL board (CN1002)
and BD (CD) board (CN101))

3. Connect the CN1005 pin 3 (OUTSW) and pin 2 (GND) on the MD DIGITAL board with a lead wire.
4. Connect the connectors between MD DIGITAL board (CN1002) and BD (CD) board (CN101) with the extension tool (part No.: J-2501-

075-A).

Under this condition, the CD can be played but the disc loading operation is disabled.

After checking, disconnect the lead wire connected in step 3.

9

The special jig (J-2501-196-A) is useful for checking the waveform of the BD (MD) board. The names of terminals and the checking items
to be performed are shown as follows.

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)
GND : Ground
TE

: Tracking error signal (Traverse adjustment)

FE

: Focus error signal

VC

: Reference level for checking the signal

RF

: RF signal (Check jitter)

I+3V

CN105

IOP

TE

VC

GND

FE

RF

I+3V
IOP
GND
TE
FE
VC
RF

I+3V

IOP

GND

TE
FE

VC

RF

1

7

for

MDM-7X2A

10

About “R”
As this unit has only a few buttons, some operations require the use of remote commander (RM-S55EN/provided with unit: 1-476-664-21)
buttons. These operations are indicated as “R” in this manual.
Example:

MENU/NO “R”

... Press the 

[MENU/NO]

 button of the remote commander.

Incorrect operations may be performed if the MD test mode is not entered properly.
In this case, press the

?/1

button to turn the power off, and retry to enter the MD test mode.

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 (IC195 of BD (MD)
board), record the IOP value on the optical pick-up according to the following procedure.

Record Procedure:
1. Press the

?

/

1

button to turn the power on.

2. Press the 

[FUNCTION]

 button to set the MD function.

3. Press three buttons of 

[             TUNING+]

, 

[REC MODE]

, and  

.m

 (MD) simultaneously to enter the MD test mode and display

“[Check]”.

4. Press the

. 

“R”

or

> 

“R”

button to display “[Service]”.

5. Press the

ENTER/YES “R”

button to display “AUTO CHECK”, and press the

> 

“R”

button to display “Iop Write”.

6. Press the

ENTER/YES “R”

button.

7. The display becomes “Ref= @@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
8. Input the IOP value written on the optical pick-up.

To select the number : Press the

. 

“R”

or

> 

“R”

button.

To select the digit

: Press the 

[REC MODE]

 button after press the 

[CD SYNC NORMAL]

 button to display “IT”.

9. When the

ENTER/YES “R”

button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).

10. As the adjustment results are recorded for the step 9 value. Leave it as it is and press the

ENTER/YES “R”

button.

11. “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop

Write”.

12. Press the 

[REPEAT STEREO/MONO]

 button to complete. “Initialize” will be displayed and release the MD test mode.

Display Precedure:
1. Press the

?

/1

button to turn the power on.

2. Press the 

[FUNCTION]

 button to set the MD function.

3. Press three buttons of 

[            TUNING+]

, 

[REC MODE]

, and  

.m

 (MD) simultaneously to enter the MD test mode and display

“[Check]”.

4. Press the

. 

“R”

or

> 

“R”

button to display “[Service]”.

5. Press the

ENTER/YES “R”

button to display “AUTO CHECK”, and press the

> 

“R”

button to display “Iop Read”.

6. Press the

ENTER/YES “R”

button.

7. “@@.@/##.#” is displayed and the recorded contents are displayed.

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

: Indicates the Iop value after adjustment.

8. Press the 

[REPEAT STEREO/MONO]

 button to complete. “Initialize” will be displayed and release the MD test mode.

If the nonvolatile memory data is abnormal, “E001 MEMORY NG” will be displayed so that the MD deck does not continue operations. In
this case, set the test mode promptly and perform the following procedure.

Procedure:
1. Enter the MD test mode.
2. Normally a message for selecting the test mode will be displayed. However if the nonvolatile memory is abnormal, the following will be

displayed “INIT EEP?”.

3. Press the

x

(MD) and Z (MD) buttons simultaneously.

4. Press the

. 

“R”

or

 >

 “R”

button to display “MDM-7X2A”.

5. Press the

ENTER/YES “R”

button. If the nonvolatile memory is successfully overwritten, the normal MD test mode will be set and a

message to select the MD test mode will be displayed.

M>

M>

11

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”.

• 0.9 mW power

Specified value : figure1

• 8.4 mW power

Specified value : figure2

Iop (at 8.4mW)

• Labeled on the optical pick-up

Iop value 

± 10mA

• Traverse waveform

Specified value : Below 10% offset

• Error rate check

Specified value : For points A and B
C1 error : About 200
AD error : below 2
For point C
C1 error: 20
AD error: below 2

• Error rate check

Specified value:
a.

When using test disc (MDW-74/GA-1)
C1 error : Below 20
AD error : 00

b.

When using check disc (TDYS-1)
C1 error : Below 20

• CPLAY error rate check

Specified value:
C1 error : Below 20
AD error : Below 2

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

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

Laser power check
(6-2 : See page 40)

Traverse check
(6-6 : See page 41)

Focus bias check
(6-7 : See page 42)

C PLAY check
(6-8 : See page 42)

Self-recording/playback
check
(6-9 : See page 42)

Temperature
compensation
offset check
(6-1 : See page 40)

• 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 (MD) board)

• Check the signals around IC101, IC151, CN102,

CN103 (BD (MD) board)

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.

Figure1:

SPECIFIED VALUE

KMS-262A

KMS-262E

0.84 to 0.92 mW
0.90 to 0.96 mW

Figure2:

SPECIFIED VALUE

KMS-262A

KMS-262E

8.1 to 8.7 mW
8.4 to 8.9 mW