Panasonic SJ-MJ50GH User manual

ORDER No.AD0201005C3
Portable MD Player
SJ-MJ50GH
MD unit: RAE1619Z-M Mechanism Series
Colour
(S)...................Silver 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)
Frequencyresponse:20 Hz~20 kHz (+0 dB, -6dB)
Wowand flutter:Belowmeasurable limit
General
Headphone output
level:
3.5 mW+3.5 mW/22
Speaker output
level:
55 mW+55 mW/16
Speakers:3.6 cm (16 )
x2
Power supply
Rechargeable
battery:
DC 1.2V
(included rechargeable
battery)
Battery:DC 1.5V (One LR6, AA, UM-3
battery)
Dimensions (WxHxD)
Cabinet dimensions
:
79.9x72.7x13.7 mm
incl.projecting parts
:
81.1x74.6x14.9 mm
Weights:97 g (with
battery)
70 g (without battery)
Playtime
[Approximate operating time in hours (in hold
mode, at 25°C, on a flat, stable surface)]
Using earphones:
Batterytype:Playtime (Normal/ LP2/ LP4)
Rechargeable:29 hours/ 41 hours/ 48 hours
Panasonic
alkaline:
55 hours/ 74 hours/ 93 hours
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Both together:87 hours/ 110 hours/ 113
hours
Using the speakers:
Batterytype:Playtime (Normal/ LP2/ LP4)
Rechargeable:9.5 hours/ 9.5 hours/ 9.5
hours
Panasonic
alkaline:
15 hours/ 15 hours/ 15 hours
Both together:26 hours/ 26 hours/ 26 hours
[When the rechargeable battery(included) is fully
recharged.]
AC adaptor and
charger
AC adaptor input:AC220 V, 50/60 Hz, 5W
AC adaptor output
and Charger input:
DC 3.5 V, 0.5A
Charger output:DC 2V, 0.5 A
Recharging time:About 3.5 hours
Notes:
- The playtime maybe less depending on
the operating conditions.
- Specifications are subject to charge
without notice. Weight and dimensions
are approximate.
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1. Accessories
- Stereo earphones...................................................1 pc.
(L0BAB0000162)
3

- Wired remote control..............................................1 pc.
(N2QCBD000020)
- External batterycase..............................................1 pc.
(K3ZZ00200041)
- Nickel-metal hydride rechargeable battery.............1 pc.
(RFKFHFAZ01EM)
- Soft case.................................................................1 pc.
(RFC0069-H)
- Speaker/batterycarger...........................................1 pc.
(L0EAAB000002)
- AC adaptor...............................................................1 pc.
(N0JCBD000001)
2. Precaution of Laser Diode
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3. Operating Instructions
4. Handling Precautions for MD Mechanism (Optical
5

pickup)
The laser diode in the MD mechanism (optical pickup) maybreak down due to
potential difference caused bystatic electricityof clothes or human body.
So, be careful of electrostatic breakdown during repair of the traverse deck
(optical pickup).
4.1. Handling the MD mechanism (optical pickup)
1. The MD mechanism (optical pickup) 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 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
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4.2. Grounding for electrostatic breakdown prevention
1. Human bodygrounding
Use the anti-static wrist strap to discharge the static electricityfrom 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. (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 traverse deck (optical pickup).
Fig. 3
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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 reassemblyafter operation checks or replacement, reverse the respective
procedures. Special reassemblyprocedures are described onlywhen
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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
adjustments (Laser power, off-set, ROM/RAM).
5.1. Checking for the P.C.B.
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- Check the P.C.B. as shown below.
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