Panasonic SJ-MJ55GH User manual

ORDER No.AD0211153C3
Portable MD Player
SJ-MJ55GH
Colour
(S)...................Silver Type
SPECIFICATIONS
Specifications
All manuals and user guides at all-guides.com
all-guides.com

Audio
System:MiniDisc digital audio system
Beam source:Semiconductor laser
Wave length: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
Headphones:
Output level (approx.):3.0 mW+3.0 mW
Inpedance (approx.):32
Speakers (ceramic card type):
Output level (approx.):45 mW+45 mW
Inpedance (approx.):200 / 1kHz
Power supply
Rechargeable battery:DC 1.2V
(included rechargeable battery)
Battery:DC 1.5V (One LR6, AA, UM-3 battery)
Dimensions (WxHxD)
Cabinet dimensions:79.9x72.7x14.1 mm
incl.projecting parts:80.9x74.2x17.0 mm
Weights:96 g (with battery)
69 g (without battery)
Playtime
[Approximate operating time in hours (in hold mode, at 25°C, on
a flat, stable surface)]
Batterytype:Playtime (Stereo/ LP2/ LP4)
Rechargeable:40 hours/ 53 hours/ 70 hours
Panasonic alkaline:63 hours/ 93 hours/ 121 hours
Both together:103 hours/ 148 hours/ 193 hours
[When the rechargeable battery(included) is fullyrecharged.]
AC adaptor and charger
AC adaptor input:AC220 V, 50/60 Hz, 5 VA
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
All manuals and user guides at all-guides.com

Notes:
- The playtime maybe less depending on the operating
conditions.
- Specifications are subject to change 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
- Stereo earphones...................................................1 pc. /
(L0BAB0000174)
- Wired remote control..............................................1 pc. /
(N2QCBD000020)
- External batterycase..............................................1 pc. /
(K3ZZ00200038)
- Nickel-metal hydride rechargeable battery.............1 pc. /
(RFKFFAZ01EM1)
- Soft case.................................................................1 pc. / (RFC0074-H)
- Speaker/Batterycharger............................................1 pc. /
(L0EAAB000011)
- AC adaptor...............................................................1 pc. /
(N0JCBD000001)
2. Precaution of Laser Diode
All manuals and user guides at all-guides.com

3. Operating Instructions
4. Handling Precautions for MD Mechanism (Optical
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 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
All manuals and user guides at all-guides.com

Fig. 2
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 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
All manuals and user guides at all-guides.com

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 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.
All manuals and user guides at all-guides.com
all-guides.com

- Check the P.C.B. as shown below.
All manuals and user guides at all-guides.com

5.2. Replacement for the intermediate cabinet
- Followthe (Step1)-(Step3) of item 5.1.
All manuals and user guides at all-guides.com

5.3. Replacement for the disk cover ass’yand the link units (L), (R)
- Followthe (Step1)-(Step3) of item 5.1.
- Followthe (Step1)-(Step4) of item 5.2.
All manuals and user guides at all-guides.com

5.4. Replacement for the traverse motor
- Followthe (Step1)-(Step3) of item 5.1.
All manuals and user guides at all-guides.com