Sony MRZ-900 Service manual

MZ-R900

SERVICE MANUAL

Ver 1.2 2001. 03

Photo: Red type

US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.

SPECIFICATIONS

Audio playing system

MiniDisc digital audio system

Laser diode properties

Material: GaAlAs
Wavelength:
Emission duration: continuous
Laser output: less than 44.6 µW
(This output is th e value measured at a d istance
of 200 mm from the lens surface on the optical
pick-up block with 7 mm aperture.)

Recording and playback time

When using MDW-80:

Maximum 160 min. in monaural
Maximum 320 min. in stereo

Revolutions

350 rpm to 2,800 rpm (CLV)

Error correction

ACIRC (Advanced Cross Interleave Reed
Solomon Code)

Sampling frequency

44.1 kHz

Sampling rate converter

Input: 32 kHz/44.1 kHz/48 kHz

Coding

ATRAC (Adaptive TRansform Acoustic
Coding)
ATRAC3 — L P2
ATRAC3 — L P4

Modulation system

EFM (Eight to Fourteen Modula tion)

Number of channels

2 stereo channels
1 monaural channel

Frequency response

20 to 20,000 Hz ± 3 dB

λ = 790 nm

Wow and Flutter

Below measurable limit

Inputs

Microphone: stereo mini-jack, minimum input
level 0.25 mV

1)

: stereo mini-jack, mini mum input

Line in
level 49 mV
Optical (Digita l) in

Outputs

i/LINE OUT2): stereo mini-jack

headphones/earphones: max imum output
level 5 mW + 5 mW, load impedance 16 ohm
LINE OUT: 194 mV, load impedance 10
kilohm

1)

The LINE IN (OPT) jack is used to connect

either a digital (optica l) ca ble or a line
(analog) cable.

2)

The i/LINE OUT jack connects either

headphones/earphones or a line cable .

Power requirements

Sony AC Power Adaptor connected at the DC
IN 3V jack:

120 V AC, 60 Hz (US model)

230–240 V AC, 50/60 Hz (UK and Hong
Kong model)
220–230 V AC, 50/60 Hz (European model)
120 V AC, 50 Hz (Canadian model)
240 V AC, 50 Hz (Australian model)
220 V AC, 50 Hz (Chinese model)
110/220 V AC, 60 Hz (Korean model)

100–240 V AC, 50/60 Hz (Other models)
Nickel metal hydride rechargeable battery NH­14WM
LR6 (size AA ) alkaline battery

1)

: optical (digital) mini-jack

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Chinese Model

Tourist Model

Model Name Using Similar Mechanism NEW
Mechanism Type MT-MZR900-171
Optical Pick-up Name LCX-4R

Battery operation time

Battery life

When recording

Batteries Stereo LP2 LP4

NH-14WM
nickel metal
hydride
rechargeable
battery

LR6 (SG)
Sony alkaline
dry battery

NH-14WM
nickel metal
hydride
rechargeable
battery
+ One LR6

5)

(SG)

1)

The battery life may be shorter due to
operating conditions and the temper a ture of
the location.

2)

When you record, use a fully char ge d
rechargeable battery. Recording time may
differ according to the alkaline batteries .

1)

2)

(Unit: approx.hours)(EIAJ3))

8 10.5 13

4)

71014

5)

19 26 30

4)

– Continued on next page –

9-927-991-13 Sony Corporation

2001C0500-1 Audio Entertainment Group
C 2001.3 General Engineering Dept.

PORTABLE MINIDISC RECORDER

MZ-R900

3)

Measured in accordance with the
EIAJ(Electronic Industries Asso ci ation of
Japan) standard.

4)

When using a 100% fully charged
rechargeable batter y.

5)

When using a Sony LR6 (SG) “STAMINA”
alkaline dry battery (produced in Japa n) .

TABLE OF CONTENTS

1. SERVICING NOTES ............................................... 3

2. GENERAL ................................................................... 4

When playing

(Unit: approx.hours)(EIAJ1))

Batteries Stereo LP2 LP4

NH-14WM

21 23 26
nickel metal
hydride
rechargeable

2)

battery
LR6 (SG)

Sony alkaline
dry battery

NH-14WM

30 35 38

3)

53 60 66
nickel metal
hydride
rechargeable

2)

battery
+ One LR6

3)

(SG)

1)

Measured in accordance with the
EIAJ(Electronic Industries Association of
Japan) standard.

2)

When using a 100% fully charged
rechargeable battery.

3)

When using a Sony LR6 (SG) “STAMINA”
alkaline dry battery (produced in Ja pa n).

Dimensions

Approx. 78.9 × 17.1 × 72.0 mm (w/h/d)

1

(3

/8 × 11/16 × 27/8 in.)

Mass

Approx. 110 g (3.9 oz) the recorder only

Supplied accessories

AC power adaptor (1)
Headphones/earphones with a remote co ntr ol
(1)
Rechargeable bat tery (1)
Dry battery case (1)
Rechargeable battery carrying case (1)
Carrying pouch/carrying case with a belt clip

(except U.S.A model) (1)

AC plug adaptor (World model only) (1)
Optical cable (1)

On power sources

• For use in your house: Use the AC power adaptor

supplied with this recorder. Do not use any other
AC power adaptor s ince it may c ause th e rec order
to malfunction.

3. DISASSEMBLY

3-1. Disassembly Flow........................................................... 5

3-2. Panel Assy , Bottom ......................................................... 5

3-3. Panel Assy, Upper Section .............................................. 6

3-4. “LCD Module”, “Panel Assy, Upper” ............................ 6

3-5. MAIN Board Assy .......................................................... 7

3-6. “Case Assy, Battery”, “MAIN Board” ........................... 7

3-7. Strip, Ornamental ............................................................ 8

3-8. “MD Mechanism Deck (MT-MZR900-171)”,

“Chassis Assy, Set” ......................................................... 8

3-9. Service Assy, OP (LCX-4R) ........................................... 9

3-10. Holder Assy ..................................................................... 10

3-11. MOTOR FLEXIBLE Board............................................ 10

3-12. Motor, DC (Sled) (M602) ............................................... 11

3-13. “Motor, DC (Spindle) (M601)”,

“Motor, DC (Over Write Head UP/DOWN) (M603) ..... 11

4. TEST MODE.............................................................. 12

5. ELECTRICAL ADJUSTMENTS......................... 17

6. DIAGRAMS

6-1. Block Diagram –SERVO Section– ................................. 27

6-2. Block Diagram –AUDIO Section– ................................. 28

6-3. Block Diagram –KEY CONTROL/DISPLAY/

POWER SUPPLY Section– ............................................ 29

6-4. Printed Wiring Boards..................................................... 30

6-5. Schematic Diagram ......................................................... 31

6-6. IC Pin Function Description ........................................... 33

7. EXPLODED VIEWS

7-1. Panel Section ................................................................... 39

7-2. Chassis Section ............................................................... 40

7-3. MD Mechanism Deck Section (MT-MZR900-171)....... 41

8. ELECTRICAL PARTS LIST ............................... 42

Polarity of the
plug

Design and specifications are subject to change
without notice.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB­LISHED BY SONY.

2

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM­POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

SECTION 1

upper panel assy

MAIN board

Tape

S806

FLEXIBLE board
(Over write head)

SERVICING NOTES

MZ-R900

NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electro­static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

NOTES ON LASER DIODE EMISSION CHECK

Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
(LCX-4R)

The laser diode in the optical pick-up block may suffer electro­static break-down easily. When handling it, perform soldering
bridge to the laser-tap on the flexible board. Also perform mea­sures against electrostatic break-down sufficiently before the op­eration. The flexible board is easily damaged and should be handled
with care.

• In performing the r epair with the power supplied to the set,
removing the MAIN board causes the set to be disabled.
In such a case, fix a conv ex part of the open/close detect s witch
(S806 on MAIN board) with a tape in advance.
Handle the FLEXIBLE board (overwrite head) with care, as it
has been soldered directly to the MAIN board.
In repairing the component side of MAIN board, connect the
FLEXIBLE board (overwrite head) and the MAIN board with
the lead wires in advance. (See page 7)

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra­diation exposure.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam­aged by heat.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C dur­ing repairing.

• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering
or unsoldering.

laser-tap

OPTICAL PICK-UP FLEXIBLE BOARD

• Replacement of CDX2671-203GA (IC801) used in this set
requires a special tool.

• On the set having the microcomputer version 1.000, some
adjusted values were set in the manual mode at the shipment,
but these data will be cleared when the NV is reset. Therefore,
on the set having the microcomputer version 1.000, change the
adjusted values following the Change of Adjusted Values
immediately after the NV was reset. (See page 17)

• If the nonvolatile memory was replaced on the set, the modif ied
program data must be written to the nonvolatile memory . In such
a case, write the modified data that meets the microcomputer
version following the patch data rewriting procedure at the
replacement of nonvolatile memory. (See page 22)

3

MZ-R900

SECTION 2

GENERAL

This section is extracted from
instruction manual.

Looking at controls

See pages in ( ) for more details.

The recorder

1
2
3
4

5
6

7

8

9

q;

A END SEARCH button (17) (47)
B Battery compartment (13)
C Jog lever (L) ( MENU/ENTER) (11)

(20) (25) (34) (43) (53)

D VOL +/– button (19) (47)
E REC MODE button (23)
F REC indicator (29)
G Terminals for attaching dry ba t te ry

case (14)

H SYNCHRO REC ON/OFF (synchro-

recording) switch (at the rear) (24)

I DC IN 3V jack (13) (16)
J HOLD switch (at the rear) (14) (55)
K REC (recor d) sw itch (17) (25)

8

qa

qs

qd

qf

qg

qh

qj

qk

ql

w;

L OPEN button (15)
M X (pause) button (17) (19) (27) (31)

(44) (47) (51)

N Display window (24) (34) (53)
O Jog lever (R) (N , ./>) (12)

(17) (19) (44) (47)

P x (stop)/CHARGE button (13) (17)

(19) (23) (43)

Q LINE IN (OPT) jack (16) (22)
R MIC (PLUG IN POWER) jack (25)
S T MARK button (44)
T i (headphones/earphones)/LINE

OUT jack (14) (31) (41)

The display window of the recorder

12 345

6 7 8 9 q; qa qs qd qf

A Alarm indication (53)
B Character information display (2 9)

(34)
Displays the disc and track names,
date, error messages, track numbers,
etc.

C AM/PM indication (30)

Lights up along with the time
indication in the 12-hour system.

D Time display (29) (40)

Shows the recorded time, current
time, elapsed time of the track or MD
being recorded or played.

E Battery indication (13)

Shows approximate battery condition.

F Sound indication (36)

Lights up when Digital Sound Preset
is on.

G Level meter (28)

Shows the volume of the MD being
played or recorded.

H LP2, LP4, MONO (monaural)

indication (2 3)

I SYNC (synchro-recording) indication

(24)
Lights up while synchro-re cording.

J REC indication (17)

Lights up while recording. W hen
flashing, the recorder is in record
standby mode.

K REC DATE (recorded/current date)

indication (4 0)
Lights up along with the date and time
the MD was recorded. When only
“DATE” lights up, the current date
and time are displayed.

L REMAIN (remaining time/tracks)

indication (28) (40)
Lights up along with the remaining
time of the track, the remaining time
of the MD, or the remaining num ber
of tracks.

M Play mode indication (34)

Shows the play mode of the MD.

N Disc indication (24) (34)

Shows that the disc is rotating for
recording, playing or editing an MD.

9

The headphones/earphones with a remote control

G

A B C DE

IJ

A DISPLAY button (29) (38) (46) (48)

(53)

B PLAYMODE button (35) (48)
C RPT/ENT (repeat/enter) but ton (36)

(37)

D SOUND button (36)
E Clip
F X (pause) butt on (19) (48) (51)

F

H

+

K

G Control (./N> ) (12) (19)

(36) (46) (48) (51) (53)

N> : play, AMS, FF
. : REW

H Control (VOL +/–) (12) (19) (48)

Pull and turn to adjust the volume.

I Display window (29) (36)
J HOLD swit ch (14) (55)
K x (stop) button (19) (38) (46) (53)

–

The display window of the remote control

A

A Track number disp l ay (29) (36) (54)
B Character information display (29)

(36) (54)

C Disc indication (29) (36) (54)
D Alarm indication (54)

BCDE

HG

E Play mode i ndi cation (36)
F Battery indication (29) (36) (54)
G REC indication (17) (29)
H SOUND indication (36)

10

F

4

• This set can be disassembled in the order shown below.

3-1. DISASSEMBLY FLOW

SET

MZ-R900

SECTION 3

DISASSEMBLY

3-2. PANEL ASSY,

BOTTOM

3-7. STRIP,

ORNAMENTAL

Note: Follow the disassembly procedure in the numerical order given.

3-3. PANEL ASSY,

UPPER SECTION

3-8. “MD MECHANISM DECK

(MT-MZR900-171)”,
“CHASSIS ASSY, SET”

3-2. PANEL ASSY, BOTTOM

S801

3-5. MAIN BOARD ASSY

3-4. “LCD MODULE”,

“PANEL ASSY, UPPER”

3-9. SERVICE ASSY, OP

(LCX-4R)

3-11. MOTOR FLEXIBLE BOARD

3-12. MOTOR, DC (SLED) (M602)

3-13. “MOTOR, DC (SPINDLE) (M601)”,

“MOTOR, DC (OVER WRITE HEAD UP/DOWN)
(M603)”

Note: On installation,

3-6. “CASE ASSY, BATTERY”,

“MAIN BOARD”

3-10. HOLDER ASSY

adjust the position of
both two switches (S801, S802)
and two knobs (hold).

5

two screws
(1.4)

knob (hold)

A

S802

1

Open the
lid, battery case.

4

Close the
battery terminal (plus).

5

two screws
(1.4)

5

screw (1.4)

6

Remove the “panel assy, bottom”
in the direction of arrow

A

3

lid, battery case

2

claw

.

5

MZ-R900

s

3-3. PANEL ASSY, UPPER SECTION

3

two screws
(1.4)

4

panel assy, upper section

1

flexible board
(CN801)

3

two screw
(1.4)

2

Push button (open).

3-4. “LCD MODULE”, “PANEL ASSY, UPPER”

1

four screws (1.7)

3

button (A), control
Note: On installation,

adjust the hole of
“button (A), control”
and boss of “panel assy,
upper”. (in the fig. , )

a

b

a

a

2

LCD module

4

button (B), control
Note: On installation,

d

b

c

adjust the boss of
“button (B), control” and
hole of “panel assy, upper”.
(in the fig. , )

c

d

b

d

5

panel assy, upper

c

6

3-5. MAIN BOARD ASSY

s

5

6

flexible board
(CN501)

7

main board assy

1

Remove two solder
of flexible board.

MZ-R900

3

four screws
(M1.4 toothed lock)

4

screw
(1.4)

3-6. “CASE ASSY, BATTERY”, “MAIN BOARD”

2

case assy, battery

2

flexible board
(CN502)

3

main board

1

Remove the solder
of terminal (plus).

1

Remove the solder
of terminal (minus).

7

MZ-R900

t

3-7. STRIP, ORNAMENTAL

5

Remove the “strip, ornamental”
in the direction of arrow

Note: As the “strip, ornamental”

is very fragile, do not
give an excessive force
to the entire assy when
removing it.

3

three bosses

4

two convex portions
pointed with

C

.

@

A

B

1

Pull toward the direction
to disengage two bosses .

A

a

)

)

Open toward the direction
to disengage two bosses
and convex portions pointed

*

with

.

B

b

A

2

)

B

boss

)

2

Open toward the direction
to disengage two bosses
and convex portions pointed

*

with

.

a

boss

B

b

C

boss

b

a

@

@

boss

b

3-8. “MD MECHANISM DECK (MT-MZR900-171)”, “CHASSIS ASSY, SET”

2

boss

3

MD mechanism deck
(MT-MZR900-171)

2

boss

4

spring (arm), tension

1

screw
(1.4)

5

chassis assy, se

1

screw (1.4)

8

3-9. SERVICE ASSY, OP (LCX-4R)

1

washer (0.8-2.5)

3

screw (M1.4)

4

spring (S), rack

5

screw

2

gear (SA)

6

screw (M1.4)

7

spring, thrust

9

Pull off “screw, lead”

MZ-R900

0

bearing (N)

8

B

service assy, OP (LCX-4R)

over write head section

qa

Opening the over write head
toward the direction
(LCX-4R) toward the direction

Note: Do not open the entire assy forcibly,

A

A

, remove the “service assy, OP

B

.

when opening the over write head.

9

MZ-R900

3-10. HOLDER ASSY

5

Remove the holder assy in the
direction of arrow

1

Open the holder assy.

D

.

A

C

B

2

Push the convex portion
toward the direction
open the holder assy toward
the direction

3

Remove the concave portion
in the direction of arrow

B

A

to erect uprightly.

and

C

.

3-11. MOTOR FLEXIBLE BOARD

1

Remove four solders of
“motor, DC (sled) (M602)”.

2

adhesive sheet

Note: Align a circular hole in the

stripping paper with a circular hole
in the “motor, DC (sled)”,
when mounting the motor
flexible board.

4

D

boss

1

Remove two solders of
DC motor (over write head up/down) (M603).

1

Remove four solders of
“motor, DC (spindle) (M601)”.

3

motor flexible board

10

DC motor (sled)
circular hole

MZ-R900

3-12. MOTOR, DC (SLED) (M602)

4

two screws
(M1.4)

5

motor, DC (sled) (M602)

1

Remove four solders of motor flexible board.

2

washer (0.8-2.5)

3

gear (SA)

3-13. “MOTOR, DC (SPINDLE) (M601)”, “MOTOR, DC (OVER WRITE HEAD UP/DOWN) (M603)”

1

Remove six solders of
motor flexible board.

4

three screws
(M1.4)

5

motor, DC
(spindle) (M601)

qa

motor, DC (over write head up/down)
(M603)

6

two screws (M1.4)

qs

chassis assy, gear

9

screw (M1.2)

8

7

Note: Press-fit the gear (HA) up to the

position of the “motor, DC (over
write head up/down) (M603) as shown
below.

gear (HA)

2.65 mm
chassis assy, gear

motor, DC (over write head
up/down) (M603)

0

gear (HA)

gear (HB)

washer (0.8-2.5)

2

washer (0.8-2.5)

3

gear (HC)

11

MZ-R900

4

0

3

SECTION 4

TEST MODE

Outline

• This set provides the Overall adjustment mode that allows CD
and MO discs to be automatically adjusted when in the test mode.
In this overall adjustment mode, the disc is discriminate between
CD and MO, and each adjustment is automatically executed in
order. If a fault is f ound, the system displays its location. Also,
the manual mode allows each individual adjustment to be auto­matically adjusted.

• Operation in the test mode is performed with the set. A key
having no particular description in the text, indicates a set key.

• For the LCD display, the LCD on the remote commander is
shown, but the contents of LCD display on the set are same.

Setting Method of Test Mode

There are two different methods to set the test mode:
1 Short SL801 (TEST) on the MAIN board with a solder bridge

(connect pin 3 of IC801 to the ground). Then, turn on the
power.

– MAIN Board (Conductor Side) –

Operation in Setting the Test Mode

• When the test mode becomes active, first the display check mode
is selected.

• Other mode can be selected from the display check mode.

• When the test mode is set, the LCD repeats the following dis­play.

Remote commander LCD display

All lit

All off

Microcomputer
version
display

Destination code
002 : Except US, Canadian models
003 : US, Canadian models

888

003 V1.000

BASS12

5860

81

70

77

79
74

1

133

IC801

615762

63

65

67

565455

68

137

135

534959

667376

+

C830

475044
453635

L801

513031
4224113
262025
401628
381723
341521
22827
189596
9419
7229
316
51048
1112241

C813

C801

C809
+

SL801
(TEST)

2 In the normal mode, turn on the [HOLD] switch. While press-

ing the [VOL --] key press the following order:

> t > t . t . t > t
. t > t . t X t X

• When the X key is pressed and hold down, the display at that
time is held so that display can be checked.

Caution: On the set having the microcomputer version 1.000,

some adjusted values were set in the manual mode at
the shipment, but these data will be cleared when the
NV is reset. Therefore, on the set having the micro­computer version 1.000, change the adjusted values
following the Change of Adjusted Values immediately
after the NV was reset (see page 17).

Releasing the Test Mode

For test mode set with the method 1:
Turn off the power and open the solder bridge on SL801 (TEST)
on the MAIN board.

Note: Remove the solders completely. Remaining could be shorted with

the chassis, etc.

For test mode set with the method 2:
Turn off the power.

Note: If electrical adjustment (see page 17) has not been finished com-

pletely, always start in the test mode. (The set cannot start in nor­mal mode)

12

Configuration of Test Mode

[VOL +]

key:100th place of item number

increase.

[VOL --]

key:100th place of item number

decrease.

[Major item switching]

[VOL +]

key:10th place of item number

increase.

[VOL --]

key:10th place of item number

decrease.

[VOL +]

key:Increases the

adjusted value

[VOL --]

key:Decreases the

adjusted value

[Medium item switching]

N

key

N

key

x

key

[Minor item switching]

[Adjusted value variation]

X

key: When adjusted value is

changed:
Adjusted value is written.
When adjusted value is
not changed:
That item is adjusted
automatically.

[Adjusted value write]

N

key: Unit place of item number

increase.

.

key:Unit place of item number

decrease.

x

key

[Test Mode $Display Check Mode%]

Press the

>

or

[VOL +]

key

[Manual Mode]

Press the

Press the

x

key

.

or

[VOL --]

key

[Overall Adjustment Mode]

Press the

Press the
or

x

key

[JOG LEVER $L% ]

[DISPLAY]

key on the remote commander

[Self-Diagnosis Result Display Mode]

Press the

x

key

[Servo Adjustment]

[Audio Adjustment]
[Power Supply Adjustment]

[OP Alignment Adjustment]

[Electrical Offset Adjustment]

Power Supply Adjustment
Auto Item Feed

CD Overall Adjustment/
MO Overall Adjustment

R

(up) key,

MZ-R900

Manual Mode

Mode to adjust or check the operation of the set by function.
Normally, the adjustment in this mode is not executed.
However, the Manual mode is used to clear the memory, power
supply adjustment, and laser power check before performing
automatic adjustments in the Overall Adjustment mode.

• Transition method in Manual Mode

1. Setting the test mode (see page 12).

2. Press the > or[VOL +] key acti vates the manual mode where
the LCD display as shown below.

Remote commander LCD display

3. During each test, the optical pick-up moves outward or in­ward while the > or . key is pressed for several sec­onds respectively.

4. Each test item is assigned with a 3-digit item number;
100th place is a major item, 10th place is a medium item, and
unit place is a minor item.
The values adjusted in the test mode are written to the
nonvolatile memory (for the items where adjustment was
made).

Press the

N

or

[REC]

key

[Sound Skip Check Result Display Mode]

Press the

Press the
on the remote commander for several
seconds (about 3 seconds)

x

key

[T MARK]

key, or

[DISPLAY]

[Key Check Mode]

The key check quits, or open the upper panel

000 Manual

key

13

MZ-R900

d

5. The display changes a shown below each time the

[JOG LEVER $L% ] (up) k ey or [DISPLAY] k ey on the remote

commander is pressed.

• Address & Adjusted Value Display

Remote commander LCD display

R

011 C68S01

item number

address

• Jitter Value & Adjusted Value Display

Remote commander LCD display

adjusted value

011 OFFJ01

item number

jitter value

• Block Error Value & Adjusted Value Display

Remote commander LCD display

adjusted value

011 063B01

block error value

item number

• ADIP Error Value & Adjusted Value Display

Remote commander LCD display

adjusted value

011 059A01

ADIP error value

item number

• Item Title Display

Remote commander LCD display

adjusted value

Self-Diagnosis Result Display Mode

This set uses the self-diagnostic function system in which if an
error occurred during the recording or playing, the mechanism
control block and the power supply control block in the
microcomputer detect it and record its cause as history in the
nonvolatile memory.
By checking this history in the test mode, you can analyze a fault
and determine its location.
Total recording time is recorded as a guideline of how long the
optical pickup has been used, and by comparing it with the total
recording time at the time when an error occurred in the self­diagnosis result display mode, you can determine when the error
occurred.
Clear both self-diagnosis history data and total recording time, if
the optical pickup was replaced.

• Self-Diagnosis Result Display Mode Setting Method

1. Setting the test mode (see page 12).

2. In the display check mode, press the [JOG LEVER $L% ] (up)
key or [DISPLAY] key on the remote commander activates the
self-diagnosis result display mode where the LCD display as
shown below.

Remote commander LCD display

R

0XX 1 0000

history code

error display code

3. Then, each time the > key is pressed, LCD display descends
by one as shown below. Also, the LCD display ascends by one
when the

. key is pressed.

Total recording time when error occurre

011 LrefPw 01

item number

item title

However in the power mode (item number 700’s), only the
item is displayed.

6. Quit the manual mode, and press the
test mode (display check mode).

Overall Adjustment Mode

Mode to adjust the servo automatically in all items.
Normally, automatic adjustment is executed in this mode at the
repair.
For further information, refer to “Section 5 Electrical Adjustments”
(see page 17).

adjusted value

x key to return to the

1

0XX 1 ****

0XX N ****

0XX N1****
0XX N2****
0XX R_****

1

XX

: Error code

****

: Total recording time

If the [JOG LEVER $L% Q] (up) key or the [DISPLAY] key on
remote commander is pressed with this display , the LCD switches
to the simple display mode.

4. Quit the self-diagnosis result display mode, and press the x key
to return to the test mode (display check mode).

14

MZ-R900

• Description of Error Indication Codes

Problem Indication code Meaning of code Simple display Description

No error 00 No error --- No error

01

Servo system error 02 High temperature Temp High temperature

03 Focus error Fcus Disordered focus
04 Spindle error Spdl Abnormal rotation of disc

TOC error

Power supply system error 22 Low battery LBat Momentary interruption detected

Offset system error

11 TOC error TOC Faulty TOC contents
12 Data reading error Data Data could not be read at SYNC

31 Offset error Ofst Offset error

32

33

34

Illegal access target
address was specified

Focus error ABCD
offset error

Tracking error
Offset error

X1 tracking error
Offset error

Adrs Attempt to access an abnormal address

ABCD Focus error ABCD offset error

TE Tracking error Offset error

X1TE X1 tracking error Offset error

• Description of Indication History

History code number Description

1 The first error
N The last error
N1 One error before the last.
N2 Two errors before the last.
R_ Total recording time

Reset the error display code

After servicing, reset the error display code.

• Setting method of Reset the Error Display Code

1. Setting the test mode (see page 12).

2. Press the [JOG LEVER $L% ] (up) key or [DISPLAY] key on the
remote commander activates the self-diagnosis result display
mode.

3. T o reset the error display code, press the X key (2 times) when
the code is displayed (except “R_****”).
(All the data on the 1, N, N1, and N2 will be reset)

R

15