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5

Display on screen

total rec

total play

retry err

total err

err history

er refresh

tm refresh

Contents of error history

Displays the recording time.
The display appears in “r                    h”. This is the accumulated time when the laser is in the “high power”
operation.  This is about 1/4 of the actual recording time. The time is shown in the range of 0h to 65535h in
hexadecimal number.

Displays the playback time.
The display appears in “p                    h”. This is the accumulated time of actual playback in which pause time is
not counted. The time is shown in the range of 0h to 65535h in hexadecimal number.

Displays the accumulated count of record retry errors and playback retry errors.
The display appears in “r       p       ”. “r” indicates the record retry error count, and “p” indicates the playback
retry error count. The retry count is shown in the range of 00 to FF in hexadecimal number.

Displays the total error count.
The message “total       ” appears. The count is shown in the range of 00 to FF in hexadecimal number.

Displays the error contents from the latest error to the last ten errors.
“0     E@@” appears. The history number is shown in     . The smaller number means the newer history. (00 is
the newest error.) The error code is indicated by @@. Refer to the following table for the contents of the error
codes. The error histories can be switched by rotating the  lAMSL  knob.

This mode is used to delete the histories of “retry err”, “total err”, and “err history”.
Before returning the repaired product to the customer, perform this operation to delete the past error history. To
delete the history, press the  lAMSL  knob and press the  YES  button after “er refresh?” appears.
“Complete!” appears for a moment and returns to the ERR DP MODE.
When this mode is executed, be sure to check the following.
•  The data have been deleted.
•  Perform recording and playback.  Check that the mechanism operates normally.

This mode is used to delete the histories of “total rec” and “total play”. These histories are used as reference
when replacing the optical pick-up.
When the optical pick-up is replaced, perform this operation to delete the histories.  Press the  lAMSL
knob.  After “tm refresh?” appears, press the  YES  button to delete the histories. “Complete!” appears for a
moment and returns to the ERR DP MODE.
When this mode is executed, be sure to check the following.
•  The data have been deleted.
•  Perform recording and playback and check that the mechanism operates normally.

Error code

Error contents

E00

No errors

E01

Disc error  Cannot read PTOC

(Disc is ejected)

E02

Disc error  UTOC error

(Disc is not ejected)

E03

Loading error

E04

Cannot read the address (Out of servo)

Error code

Error contents

E05

Out of FOK

E06

Focus does not lock (Out of servo)

E07

Record retry

E08

Record retry error

E09

Playback retry error

(Access error)

E0A

Playback retry error (C2 error)

6

1

 Remove the 16 screws (BVTT3 x 8) from the bottom plate. (Refer to Section 3 “Disassembly” Loading panel.) (page 14)

2

 Remove the bottom plate.

3

 Rotate the pully gear in the direction of the arrow A and open the tray in the direction of the arrow B.

4

 When checking the laser power, remove beforehand the loading panel by removing the two screws (M2.6) and sliding aside the loading

panel becouse the cable of the laser power meter can be pinched by the loading panel. (Refer to Section 3 “Disassembly” Loading
panel.) (page 14)

Use this function when the MDS-JA555ES cannot be operated normally due to hung-up of the microprocessor.
It is recommended to use this function when you cannot exit the test mode or the retry-cause-display mode, or when the normal operation
cannot be performed after the MDS-JA555ES is disassembled once then re-assembled.

Procedure : Remove the AC power plug from the wall outlet.  Short-circuit pin-1 and pin-3 of CN703 on the BT board with a pair of

tweezers or the like, to discharge the back-up battery.

A

B

Pulley gear 

Tray assembly

Two screws 
     (M2.6)

Remove the Loading panel

[BT board] (Conductor side)

CN703

JW790

JW791

1

3

BT701

7

Use of the exclusive tool (J-2501-149-A) is convenient to check the waveforms on the BD board.

GND : Ground terminal
I+3V : For measuring IOP (Checking deterioration of the optical pickup laser)
IOP

: For measuring IOP (Checking deterioration of the optical pickup laser)

TEO : TRK error signal (traverse adjustment)
VC

: Reference level for when checking signals

RF

: RF signal (jitter check)

RF

VC

TEO

IOP

I+3V

GND

5pin connector

CN110

6pin connector

Schematic diagram of the connecting tools

To MDM-5
To MDM-6

RF
VC
TEO

To MDM-3

IOP
I-3V

VC
RF
TEO
IOP
I+3V
GND

VC

RF

TEO

IOP

I+3V

GND

1

5

1

6

8

The IOP data that is indicated on the optical pick-up, can be saved in the non-volatile memory of the MDS-JA555ES.  Saving the IOP data in
the memory eliminates the needs to look at the printed value on the label that is attached on the surface of optical pick-up, and enables to view
the IOP data on display.  When the optical pick-up is replaced or when the non-volatile memory (IC171 on BD board) is replaced, save the
IOP value that is printed on the label on the surface of optical pick-up by the following procedure.

1. While pressing the  lAMSL  knob and the  x  button at the same time, connect the AC power plug to the wall outlet, then remove

your hands from the  lAMSL  knob and  x  button at the same time.  When the MDS-JA555ES enters the test mode, the message
“[Check]” appears.

2. Rotate the  lAMSL  knob until the message “Service” appears.  Then press the  YES  button.
3. Rotate the  lAMSL  knob until the message “lop Write” (C28) appears.  Then press the  YES  button.
4. “Ref=@@@.@” (@ is arbitrary number) appears and the values that can be changed as desired flash.
5. Input the IOP value that is printed on the optical pick-up.

Selection of alphanumeric characters : Rotate the  lAMSL  knob.
Selection of digit

: Press the  lAMSL  knob.

6. Press the  YES  button.  Then display changes to “Measu= @@@.@” (@ is arbitrary number).
7. The value that is shown step 6, is the result adjustment and should not be saved.  So leave the value of step 6 as it is, and press the  YES

button.

8. The message “Complete!” appears for a moment, and the value is saved in the non-volatile memory.  The message “Iop Write” appears.
9. Upon completion of data saving, press the  REPEAT  button.

1. While pressing the  lAMSL  knob and the  x  button at the same time, connect the AC power plug to the wall outlet, then remove

your hands from the  lAMSL  knob and  x  button at the same time.  When the MDS-JA555ES enters the test mode, the message
“[Check]” appears.

2. Rotate the  lAMSL  knob until the message “Service” appears.  Then press the  YES  button.
3. Rotate the  lAMSL  knob until the message “lop Write” (C28) appears.  Then press the  YES  button.
4. The message “@@.@/##.#” appears.  The contents that are saved in the non-volatile memory appear.

@@.@

: The IOP value that is printed on optical pick-up

##.#

: The IOP value after adjustment

5. To exit the data display, press the  lAMSL  knob or the  MENU/NO  button to show the message “Iop Read”. Then press the

REPEAT  button.