Panasonic SJ-MJ75 User manual

ORDER No.AD0001029C8
Portable MD Player
SJ-MJ75
Colour
(S)...................Silver Type
Areas
EB...................Great Britain.
EG...................Europe.
GH...................Hong Kong.
1

SPECIFICATIONS
Specifications
Mechanism unit:RAE1611Z Mechanism Series
Audio
System:MiniDisc digital audio system
Laser:Semiconductor laser (=790
nm)
Sampling frequency:44.1 kHz
Decoding:Adaptive Transform
Acoustic Coding (ATRAC)
No. of channels:2 (left and right, stereo)
1 (monaural)
Frequencyresponse
:
20 Hz-20 kHz (+0 dB, -8dB)
Wowand flutter:Belowmeasurable limit
General
Output Jack:Phones, 14
Power output:5 mW+5 mW
Power supply
Rechargeable
battery:
DC 1.2V
(included rechargeable
battery)
Battery:DC 1.5V (One LR6, AA, UM-3
battery)
Dimensions
(WxHxD)
Cabinet
dimensions:
71.5x78.5x15.4 mm
incl.projecting
parts:
72.8x79.9x15.4 mm
Weight:86 g (with battery)
61 g (without battery)
Playtime
(When used in hold mode, at 25°C, on a flat, stable
surface)
Batterytype:Playtime
Rechargeable:About 10 hours
Panasonic
alkaline:
About 34 hours
2

Both together:About 44 hours
Charger
Input:AC120-240 V (EG)/
AC230-240 V (EB)/ AC220V
(GH), 50 Hz 4W
Notes:
- The playtime maybe less depending on
the operating conditions.
- Specifications are subject to charge
without notice. Weight and dimensions
are approximate.
1
1. Precaution of Laser Diode
2. Accessories
3

- Batterycase...........................................................1pc.
(RFA1136-H)
- Carrying case.........................................................1pc.
(RFC0056-K)
- Remote control.......................................................1pc.
(RFEV025P-SM)
- Stereo earphones...................................................1pc.
(RFEV319P-S1A)
For EB area
- Charger...................................................................1pc.
(RP-BC155AEBY)
For EG area
- Charger...................................................................1pc.
(RP-BC155AEYB)
For GH area
- Charger...................................................................1pc.
(RP-BC155AGH)
For EB, EG areas
- Rechargeable batterywith carrying case............1pc.
(RFKFBP140HSY)
For GH area
- Rechargeable batterywith carrying case............1pc.
(RP-BP61GY-S)
4

3. Location of Controls
4. Handling Precautions for Traverse Deck
(Mechanism Unit)
The laser diode in the mechanism unit (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 mechanism unit (optical
pickup).
4.1. Mechainsm Unit (optical pickup)
1. Do not subject the mechanism unit (optical pickup) to static electricityas it is
extremelysensitive to electrical shock.
2. Before removing the mechanism unit (optical pickup), the short land on the
flexible board is shorted with a solder build-up to prevent damage to the laser
diode. (As shown in Fig.1.)
3. It is a posibilityto disconnect if it applies over pressures to the flexible
P.C.B., as take care of handling the flexible P.C.B..
Fig.1
5

4.2. Caution for Replacement of Mechanism Unit (Optical
Pickup)
If you remove the flexible P.C.B. of the optical pickup from the connector of
main P.C.B., perform it after shorting with a solder build-up the short land to
protect the breaking down bystatic electricity.
The optical pickup that is supplied as replacement parts is shorted with a solder
build-up the short-land of flexible P.C.B. to protect the breaking down bystatic
electricity.
After connecting the flexible P.C.B. of the optical pickup to the connector of
main P.C.B., remove the solder build-up on the short-land and confirm that is
opened. (As shown in Fig.1)
4.3. Grounding for electrostatic breakdown prevention
1. Human bodygrounding
Use the anti-static wrist strap to discharge the static electricityfrom your
6

body. (As shown in Fig.2.)
2. Work table grounding
Put a conductive material (sheet) or steel sheet on the area where the optical
pickup is placed, and ground the sheet. (As shown in Fig.3)
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.2
Fig.3
7

5. Operation Checks and Component Replacement
Procedures
- This section describes procedures for checking the operation of the major
printed circuit boards and replaceing 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 P.C.B.
5.1.1. Checking for the P.C.B. (Aside)
8

9

- Check the P.C.B. (Aside) as shown below.
5.1.2. Checking for the P.C.B. (B side)
10