Panasonic SJMR-200 Service manual
ORDER No.AD0009165C8
Portable MD Recorder
SJ-MR200
MD unit: RAE1630Z-M Mechanism Series
Colour
(S)...................Silver Type
(W)..................White Type
SPECIFICATIONS
Areas
EB...................Great Britain.
EG...................Europe.
GH...................Hong Kong.
Specifications
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Audio
System:
Laser:
Sampling frequency:
Coding:
No. of channels:
Frequency response:
Wow and flutter:
General
Input terminal
OPT/LINE IN jack
Impedance:
Input level:
MIC jack
Impedance:
Input level:
Output terminal
Output Jack:
Power output:
Power supply
Rechargeable battery:
Battery:
AC adaptor:
Dimensions (WxHxD)
Cabinet dimensions:
incl.projecting parts:
Weight:
MiniDisc digital audio system
Semiconductor laser (=780 nm)
44.1 kHz
Adaptive Transform Acoustic Coding
(ATRAC)
2 (left and right, stereo)
1 (monaural)
20 Hz-20 kHz (+0 dB, -6dB)
Below measurable limit
47k
SENS H: 178mV
SENS L: 500mV
600
0.4mV
Phones, 22
3.5 mW+3.5 mW
DC 1.2V
(included rechargeable battery)
DC 1.5V (One LR6, AA, UM-3 battery)
DC 1.8V (included AC adaptor)
78.2x71.6x16.8
mm
79.9x73.6x18.6
mm
120 g (with
battery)
94 g (without battery)
Play time
(When used in hold mode, at 25°C, on a flat, stable surface)
Battery type:Play timeRecord time
Rechargeable:
Panasonic alkaline:
Both together:
Charger
Input:
Recharging time:
About 15 hoursAbout 7 hours
About 21 hoursAbout 3 hours
About 38 hoursAbout 15 hours
AC 220 V (GH) / AC220-230 V (EG) /
AC 230-240V (EB), 50/60 Hz 8W
About 3 hours
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Notes:
- The play time may be less depending on the operating
conditions.
- Specifications are subject to charge without notice. Weight
and dimensions are approximate.
2000 Matsushita Electric Industrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation of law.
1. Accessories
- Rechargeable battery with carrying case .............1pc.
(RFKFHFAZ01EM)
- External battery case...............................................1pc.
(RFA1537-S)
- Carrying case.........................................................1pc.
(RFC0056-K)
- Wired remote control.............................................1pc.
(N2QCBD000007)
- Stereo earphones..................................................1pc.
(RFEV335P-SA)
- Connection cable..................................................1pc.
(K2KA39B00001)
For EB area
- AC adaptor.............................................................1pc.
(RFEA003B-S)
For EG area
- AC adaptor.............................................................1pc.
(N0JCAD000001)
For GH area
- AC adaptor.............................................................1pc.
(RFEA004H-S)
2. Precation of Laser Diode
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3. Operating Instructions
4. Handling Precautions for Traverse Deck
The laser diode in the traverse deck (optical pickup) may break down due to potential difference
caused by static electricity of clothes or human body.
So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup).
4.1. Handling the traverse deck (optical pickup)
1. The traverse deck (optical pickup) is an extremely high-precision
construction and must not be subjected to impact, excessive
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vibration, or other types of rough handling.
2. In order to prevent static electricity damage to the laser diode,
use a short pin or similar tool to short the optical pickup’s flexible
circuit boards after they have 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
4.2. Grounding for electrostatic breakdown prevention
1. Human body grounding
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 traverse deck (optical pickup) is placed, and ground the sheet.
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(as shown in Fig. 4 )
Caution
The static electricity of your clothes will not be grounded through
the wrist strap.
So, take care not to let your clothes touch the traverse deck (optical
pickup).
Fig. 3
Fig. 4
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 reassembly after operation checks or replacement, reverse the
respective procedures. Special reassembly procedures are
described only when 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. (A side) as shown below.
[Checking for the main P.C.B. (B side)]
- Each parts on main P.C.B. (B side) can not be checkesd directly,
however, for the checking of main component parts on P.C.B.,
refer to the “Checking procedures of main components parts on
the main P.C.B. (B side).
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5.2. Replacement for the intermediate cabinet
- Follow the (Step 1) - (Step 3) of item 5.1.
5.3. Replacement for the open knob and lock unit
- Follow the (Step 1) - (Step 3) of item 5.1.
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- Follow the (Step 1) - (Step 3) of item 5.2.
5.4. Replacement for the traverse motor
- Follow the (Step 1) - (Step 3) of item 5.1.
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5.5. Replacement for the LCD
- Follow the (Step 1) - (Step 3) of item 5.1.
- Follow the (Step 1) - (Step 3) of item 5.2.
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5.6. Replacement for the lift motor
- Follow the (Step 1) - (Step 3) of item 5.1.
- Follow the (Step 1) - (Step 3) of item 5.2.
- Follow the (Step 1) of item 5.5.
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5.7. Replacement for the optical pickup
- Follow the (Step 1) - (Step 3) of item 5.1.
- Follow the (Step 1) - (Step 3) of item 5.2.
- Follow the (Step 1) - (Step 4) of item 5.4.
- Follow the (Step 1) 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 “ROM/RAM auto-adjustment”.
6.1. Instruments to prepare
1. Playback-only disc (Test disc RFKV0006)
2. Commercially available recordable disc (fully recorded with
music) (magneto-optical disc)
3. Laser power meter (LE8010 or compatible meter)
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4. Remote controller
6.2. Laser power adjustment, Playback-only disc/magneto-optical
disc automatic adjustment
6.2.1. Enter the adjustment mode
1. Set the battery and connect the remote controller.
2. Turn off the power, and switch main unit’s HOLD switch off.
3. Press the VOL+, VOL-, , and buttons on the remote
controller within two seconds. (as shown in Fig. 5 )
Fig. 5
4. When the adjustment mode is activated, “ T1 EX ” will be
displayed on the LCD of remote controller. After “ T1 EX ” is
displayed, select the desired adjustment item with the button
or button of the remote controller. (If it is not displayed,
perform the procedures written above again.)
Adjustment mode
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Adjustment mode Display
Laser power adjustment T1
Magneto-optical disc automatic adjustment T2
Playback-only disc automatic adjustment T3
EFM jitter meajurement T4
Record inspection T5
REC jitter meajurement T6
Magneto-optical disc automatic adjustment
value check
Playback-only disc automatic adjustment value
check
Error rate measurement (double velocity) T9
AD read result confirmation TA
ROM collection check sum TB
DRAM check TC
Reliability test TD
Tilt measurement (disc middle speed) TE
PWB inspection (audio test) TF
*In the display of T1 ~ TF shown above, you must adjust T1, T2 and TF. You must perform the
adjustment by observing the order T1 T2 T3.
T7
T8
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, they are very fragile. 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 very fine 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 may be burned.
- Do not allow the write power to even momentarily reach or exceed
5 mW. 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 may result in damage to the MD.
- Laser diode in the optical pickup may be destroyed by the
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