Panasonic SJMJ-75 Service manual

ORDER No.AD0001029C8

Portable MD Player

SJ-MJ75

Colour

(S)...................Silver Type

Areas

EB...................Great Britain.

EG...................Europe.

GH...................Hong Kong.

SPECIFICATIONS

Mechanism unit:RAE1611Z Mechanism Series

Audio

System:MiniDisc digital audio system

Laser:Semiconductor laser (=790

Sampling frequency:44.1 kHz

Decoding:Adaptive Transform

No. of channels:2 (left and right, stereo)

Frequency response:20 Hz-20 kHz (+0 dB, -8dB)

Wow and flutter:Below measurable limit

General

Output Jack:Phones, 14

Power output:5 mW+5 mW

Power supply

Rechargeable battery:

Battery:DC 1.5V (One LR6, AA, UM-3

Dimensions (WxHxD)

Cabinet dimensions:

incl.projecting parts:

Weight:86 g (with battery)

Specifications

nm)

Acoustic Coding (ATRAC)

1 (monaural)

DC 1.2V

(included rechargeable battery)

battery)

71.5x78.5x15.4 mm

72.8x79.9x15.4 mm

61 g (without battery)

Play time

(When used in hold mode, at 25°C, on a flat, stable surface)

Battery type:Play time

Rechargeable:About 10 hours

Panasonic alkaline:

About 34 hours

Both together:About 44 hours

Charger

Input:AC120-240 V (EG)/

AC230-240 V (EB)/ AC220V (GH), 50 Hz 4W

Notes:

- The play time may be less depending on

the operating conditions.

- Specifications are subject to charge

without notice. Weight and dimensions are approximate.

1. Precaution of Laser Diode

2. Accessories

- Battery case...........................................................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 battery with carrying case............1pc.

(RFKFBP140HSY)

For GH area

- Rechargeable battery with carrying case............1pc.

(RP-BP61GY-S)

3. Location of Controls

4. Handling Precautions for Traverse Deck (Mechanism Unit)

The laser diode in the mechanism unit (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 mechanism unit (optical pickup).

4.1. Mechainsm Unit (optical pickup)

1. Do not subject the mechanism unit (optical pickup) to static electricity as it is extremely sensitive 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 posibility to disconnect if it applies over pressures to the flexible P.C.B., as take care of handling the flexible P.C.B..

Fig.1

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 by static 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 by static 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 body grounding Use the anti-static wrist strap to discharge the static electricity from your

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 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.2

Fig.3