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ENTER/YES

s

M (MD JOG)

m (MD JOG)

REC MODE

REC

CLEAR

A

Sets continuous playback when pressed in the STOP state. When pressed during continuous

playback, the tracking servo turns ON/OFF.

Stops continuous playback and continuous recording.

The sled moves to the outer circumference only when this is pressed.

The sled moves to the inner circumference only when this is pressed.

Switches between the pit and groove modes when pressed.

Switches the spindle servo mode (CLV S y CLV A).

Switches the displayed contents each time the button is pressed.

Ejects the disc.

Exits the test mode.

Each time the  MD DISPLAY  button is pressed, the display changes in the following order.
When CPLAY and CREC are started, the display will forcibly be switched to the error rate display as the initial mode.

1. Mode display
Displays “TEMP ADJUS” (C03), “CPLAY1MODE” (C34), etc.

2. Error rate display
Displays the error rate in the following way.

C1 =         AD =   
C1 = Indicates the C1 error.
AD = Indicates ADER.

3. Address display
The address is displayed as follows. (MO:recordable disc, CD:playback only disc)
If the  CLEAR  button is pressed after pressing the  PROGRAM  button, the display
switches from groove to pit or vice versa.
h =         s =         (MO pit and CD)
h =         a =         (MO groove)
h = Indicates the header address.
s = Indicates the SUBQ address.
a = Indicates the ADIP address.

Note: “–” is displayed when the address cannnot be read.

Mode display

Error rate display

Address display

Auto gain display (Not used in servicing)

Detrack check display (Not used in servicing)

IVR display (Not used in servicing)

C1 error and Jitter display

(Not used in servicing)

AD error and Jitter display

(Not used in servicing)

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Servo OFF

Tracking servo ON

Recording mode OFF

CLV normal mode

Tracking offset cancel OFF

Groove

Low reflection

CLV A

CLV UNLOCK

Servo ON

Tracking servo OFF

Recording mode ON

CLV low speed mode

ABCD adjustment completed

Tracking offset cancel ON

Tracking auto gain OK

Focus auto gain OK

Pit

High reflection

CLV S

CLV LOCK

G

S

REC

SYNC

L.SYNC

OVER

B/1

A-/REP

TRACK/(LP) 4/Calendar frame

DISC/LP2

SLEEP/SHUF

MONO

This test mode performs CREC and CPLAY automatically for mainly checking the characteristics of the optical pick-up.
To perform this test mode, the laser power must first be checked.
Perform AUTO CHECK after the laser power check and Iop check.

Procedure
1. Press the  ENTER/YES  button. If “LDPWR” is displayed, it means that the laser power check has not been performed. In this case, perform

the laser power check and Iop compare, and then repeat from step 1.

2. If a disc is in the mechanical deck, it will be ejected forcibly.

“DISC IN” will be displayed in this case. Load a test disc (MDW-74/GA-1) which can be recorded.

3. If a disk is loaded at step 2, the check will start automatically.
4. When “XX CHECK” is displayed, the item corresponding to XX will be performed.

When “06 CHECK” completes, the disc loaded at step 2 will be ejected. “DISC IN” will be displayed. Load the check disc (MD) TDYS-1.

5. When the disc is loaded in step 4, the check will automatically be resumed from “07 CHECK”.
6. After completing to test item 12, check OK or NG will be displayed. If all items are OK, “CHECK ALL OK” will be displayed. If any item

is NG, it will be displayed as “NG:xxxx”.

When “CHECK ALL OK” is displayed, it means that the optical pick-up is normal. Check the operations of the other spindle motor, thread
motor, etc.
When displayed as “NG:xxxx”, it means that the optical pick-up is faulty. In this case, replace the optical pick-up.

Display the software version.

Procedure
1. If displayed as “INFORMATION”, press the  ENTER/YES  button.
2. The software version will be displayed.
3. Press the  MENU/NO  button to end this 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. Set the test mode. (Refer to 4-2.)
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  s  button and  A  button together.
4. Rotate the  MD JOG  knob and select MDM-7B.
5. Press the  MD JOG  knob. If the nonvolatile memory is successfully overwritten, the normal test mode will be set and a message to select

the test mode will be displayed.

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Procedure:
1. Connect oscilloscope to TP (RF).

As TP (RF) and TP (VC) are located at the edge of board, clip
them together with the board using alligator clips.

2. Turn the power ON.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF sig-

nal level is correct or not.

Note: Clear RF signal waveform means that the shape “ ” can be clearly

distinguished at the center of the waveform.

RF signal waveform

Note:
1. CD Block is basically designed to operate without adjustment.  There-

fore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 M

Ω impedance.

4. Clean the object lens by an applicator with neutral detergent when the

signal level is low than specified value with the following checks.

5. Use the following extension cables and relay connector.

• Extension cable (19P) (Part No. J-2501-011-B)

Relay connector (Part No. J-2501-167-A)
(BD (CD) board CN101 to MAIN board CN111)

• Extension cable (17P) (with connector) (Part No. J-2501-167-A)

(CONNECTOR board CN701 to MAIN board CN301)

Procedure:
1. Connect oscilloscope to TP (FEO).
2. Connect between TP (FEO) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP (GND) by lead wire.
4. Turn the power ON.
5. Load a disc (YEDS-18) and turn the power ON again and actu-

ate the focus search.  (Actuate the focus search when disc tray
is moving in and out)

6. Check the oscilloscope waveform (S-curve) is symmetrical be-

tween A and B.  And confirm peak to peak level within 2.4±0.7
Vp-p.

S-curve waveform

7. After check, remove the lead wire connected in step 2.

Note: • Try to measure several times to make sure than the ratio of A : B

or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the brightness

to obtain best waveform.

± 0.7 Vp-p

± 0.2 Vp-p

[ BD (CD) BOARD ] — SIDE B —

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If malfunctions caused by the optical pick-up such as sound skipping are suspected, follow the following check.

Other faults are suspected.
Check the threading mechanism, etc.

Start

NG

NG

NG

OK

OK

OK

Laser Power Check

5-6-2.

(See page 31)

5-6-3.

(See page 31)

5-6-4.

(See page 32)

Iop Compare

Auto Check

Replace the optical pick-up or MDM-7B