Panasonic SJ-MR230DGH User manual

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ORDER No.AD0211148C3
Portable MD Recorder
SJ-MR230DGH / SJ-MR230DGK
Colours
(S)...................Silver Type
(R)...................Red Type [(GK) area only.]
(A)...................Blue Type
SPECIFICATIONS
Specifications

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Audio
System:MiniDisc digital audio system
Laser:Semiconductor laser (=780 nm)
Sampling frequency:44.1 kHz
Coding:Adaptive Transform Acoustic Coding
(ATRAC / ATRAC3)
No. of channels:2 (left and right, stereo)
1 (monaural, playonly)
Frequencyresponse:20 Hz-20 kHz (+0 dB, -8dB)
Wowand flutter:Belowmeasurable limit
General
Input terminal
OPT/LINE IN jack
Impedance:22k
Input level:SENS H:178mV
SENS L:500mV
MIC jack
Impedance:600
Input level:SENS H:0.4mV
SENS L:2.5mV
Output terminal
Head phone Jack:3.0 mW+3.0 mW, 32
Speakers (Cradle):0.9 mW+0.9 mW, 8
Speakers
impedance:8
Power supply
Rechargeable battery:DC 1.2V
(included rechargeable battery)
Battery:DC 1.5V (One LR6, AA, UM-3 battery)
AC adaptor:DC 4.5V (included AC adaptor)
Dimensions (WxHxD)
Cabinet dimensions:78.2x71.6x17.9
mm
incl.projecting parts:80.4x74.1x17.9
mm
Weight:121 g (with
battery)
94 g (without battery)
Playtime
(When used in hold mode, at 25°C, on a flat, stable surface)
Batterytype:PlaytimeRecord time
Rechargeable
Normal:About 27 hoursAbout 13 hours
LP2:About 35 hoursAbout 18 hours
LP4:About 42 hoursAbout 23 hours
Panasonic alkaline
Normal:About 42 hoursAbout 8 hours
LP2:About 59 hoursAbout 13 hours

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LP4:About 70 hoursAbout 21 hours
Both together
NormalAbout 77 hoursAbout 35 hours
LP2:About 100 hoursAbout 50 hours
LP4:About 117 hoursAbout 62 hours
Notes:
- The playtime maybe less depending on the operating
conditions.
- Specifications are subject to charge without notice. Weight
and dimensions are approximate.
2002 Matsushita Electric Industrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation of law.
1. Accessories
- Rechargeable batteryass’y....................................1pc.
(RFKFFAZ01EM1)
- Rechargeable batt. case.........................................1pc.
(RFA0475-Q)
- External batterycase..............................................1pc.
(RFA1537-S2)
- Carrying case.........................................................1pc.
(RFC0069-H)
- Stereo earphones...................................................1pc.
(L0BAB0000174)
- Connection cable...................................................1pc.
(K2KA39B00001)
- Clip type headphones............................................1pc.
(L0BAE0000026)
- Optical fiber cable..................................................1pc.
(K7CXJCA00004)
- Wired remote control..............................................1pc.

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(N2QCBD000012)
For GH area
- Speaker ass’y.........................................................2pcs.
(RFKAJMR250-S)
- Cradle.....................................................................1pc.
(RFE0114A)
- AC adaptor.............................................................1pc.
(RFEA413H-W)
For GK area
- Speaker ass’y.........................................................2pcs.
(RFKAMR230GKS)
- Cradle.....................................................................1pc.
(RFE0114B)
- AC adaptor..............................................................1pc.
(RFEA413T-1W)
2. Precation of Laser Diode

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3. Operating Instructions
4. Handling Precautions for Optical Magnetism Head
Unit
The laser diode in the optical magnetism head unit maybreak down due to potential difference
caused bystatic electricityof clothes or human body.
So, be careful of electrostatic breakdown during repair of the optical magnetism head unit.
4.1. Handling the optical magnetism head unit
1. The optical magnetism head unit is an extremelyhigh-precision
construction and must not be subjected to impact, excessive
vibration, or other types of rough handling.
2. In order to prevent static electricitydamage to the laser diode,
use a short pin or similar tool to short the optical pickup’s flexible
circuit boards after theyhave been disconnected from the main
circuit board. (as shown in Fig. 1 )
3. Handle the flexible circuit boards with care; excessive force could
cause them to be broken.
4. Do not turn the pre-set variable resistor (for adjustment of the
laser power); it has been adjusted at the factory.
(as shown in Fig. 2 )
Fig. 1
Fig. 2

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4.2. Grounding for electrostatic breakdown prevention
1. Human bodygrounding
Use the anti-static wrist strap to discharge the static electricity
from your body. (as shown in Fig. 3 )
2. Work table grounding
Put a conductive material (sheet) or steel sheet on the area where
the optical magnetism head unit is placed, and ground the sheet.
(as shown in Fig. 4 )
Caution
The static electricityof your clothes will not be grounded through
the wrist strap.
So, take care not to let your clothes touch the optical magnetism
head unit.
Fig. 3
Fig. 4

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5. Operation Checks and Component Replacement
Procedures
- This section describes procedures for checking the operation of
the major printed circuit boards and replacing the main
components.
- For reassemblyafter operation checks or replacement, reverse the
respective procedures. Special reassemblyprocedures are
described onlywhen required.
- After replacing the main components (optical pickup or traverse
motor, etc.) of mechanism unit block, change to the adjust mode,
and then perform the “ ROM/RAM auto-adjustment”.
5.1. Checking for the main P.C.B.

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- Check the main P.C.B. (Aside) as shown below.
5.2. Replacement for the intermediate cabinet
- Followthe (Step1)-(Step3) of item 5.1.

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5.3. Replacement for the open knob
- Followthe (Step1)-(Step3) of item 5.1.
- Followthe (Step1)-(Step4) of item 5.2.

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5.4. Replacement for the traverse motor
- Followthe (Step1)-(Step3) of item 5.1.

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5.5. Replacement for the LCD
- Followthe (Step1)-(Step3) of item 5.1.
- Followthe (Step1)-(Step4) of item 5.2.

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5.6. Replacement for the lift motor
- Followthe (Step1)-(Step3) of item 5.1.
- Followthe (Step1)-(Step4) of item 5.2.
- Followthe (Step1) of item 5.5.

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5.7. Replacement for the optical pickup
- Followthe (Step1)-(Step3) of item 5.1.
- Followthe (Step1)-(Step4) of item 5.2.
- Followthe (Step1)-(Step5) of item 5.4.
- Followthe (Step1) of item 5.5.

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6. Measurements and Adjsutments
Note:
After replacing the main components (optical pickup or traverse motor, etc.) of mechanism unit
block, change to the adjust mode, and then perform the “laser power adjustment”, “off-set auto-
adjustment” and “playback-onlydisc/magneto-optical disc auto-adjustment”.
6.1. Instruments to prepare
1. Playback-onlydisc (Test disc RFKV0006)
2. Commerciallyavailable recordable disc (fullyrecorded with
music) (magneto-optical disc)
3. Laser power meter (LE8010 or compatible meter)
4. Remote controller (part No. N2QCBD000012 or N2QCBD000002, is
attached to SJ-MJ75 (SJ-MJ75 is GH area only.))

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Note:
For use of MD cartridge type laser power meter, remove the intermediate cabinet before
perform the laser power adjustment (as for the method of disassembly, refer to “5. Operation
checks and main component replacement procedures”.).
6.2. Laser power adjustment, Off-set automatic adjustment and
Playback-onlydisc/magneto-optical disc auto- adjustment
6.2.1. Enter the adjustment mode
1. Set the batteryand connect the remote controller.
2. Turn off the power, and switch main unit’s HOLD switch off.
3. Press the buttons of the remote controller in order from 1 to 4 (as
shown in Fig. 5 ).
Fig. 5
4. When the adjustment mode is activated, “T0E**” will be displayed
on the LCD of remote controller and unit. After “T0E**” is
displayed, select the desired adjustment itemwith the button
or button of the remote controller. (If it is not displayed,
perform the procedures written above again.)

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*In the displayof T0E** ~ TFE** shown above, you must adjust T0E**, T1E**, T2E** and T3E**.
You must perform the adjustment byobserving the order T0E** T1E** T2E** T3E**.
6.2.2. Laser Power Adjustment
Adjust each laser power: read power for reading (play) and write power for writing (record).
6.2.2.1. Set the Unit to the Adjustment Mode
Cautions
About handling the optical pickup and the magnetic head.
- The optical pickup and the magnetic head are structured precisely;
therefore, theyare veryfragile. Be careful not to touch them with
the edge of the laser power meter. Do not touch the lens.
- The sensor of the laser power meter is a veryfine part. Be careful
not to touch it to the optical pickup lens.
- Do not loosen or remove the magnetic head installing screw.
- The focus point of the laser reaches to 356°F. Therefore, avoid
adjusting using laser power for a long time because the sensor of
the laser power meter maybe burned.
- Do not allowthe write power to even momentarilyreach or exceed
6mW. Doing so will result in damage to the optical pickup.
- Do not set the unit to the laser power adjustment mode with the
MD loaded. Doing so mayresult in damage to the MD.
- Laser diode in the optical pickup maybe destroyed bythe
staticelectricitygenerated in your clothes or body. Be especially
careful with the static electricity.
6.2.2.2. Adjustment Procedure

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1. Have “T0E** ” indicated on display, and move the optical pickup
to the most inside (onlywhen a MD cartridge type laser power
meter is used).
2. Set the laser power meter.
[For use of stick type laser power meter.]
2-1 Uncover the laser power meter. (as shown in Fig. 6 )
2-2 Locate the sensor of the laser power meter right over above
the optical pickup (horizontallyat a level of the disc position). (as
shown in Fig. 7 )
[For use of MD cartridge type laser power meter.]
2-1 Set the laser power meter and close the disc cover, fix it with
tape as not to open. (as shown in Fig. 8 )
Fig. 6
Fig. 7
Fig. 8
3. Press the PLAY keyof the remote controller (“T0E** ” changes to
“LD ” of the LCD).
4. Press the keyof the remote controller (“LD ” changes to “LP ”
of the LCD).