Panasonic SJMJ-50-GH Service manual

ORDER No.AD0201005C3

Portable MD Player

SJ-MJ50GH

MD unit: RAE1619Z-M Mechanism Series

Colour

SPECIFICATIONS

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

Specifications

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)

Frequency response:20 Hz~20 kHz (+0 dB, -6dB)

Wow and flutter:Below measurable limit

General

Headphone output

3.5 mW+3.5 mW/22

level:

Speaker output

55 mW+55 mW/16

level:

Speakers:3.6 cm (16 )

Power supply

Rechargeable

DC 1.2V

battery:

(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)

Play time

[Approximate operating time in hours (in hold mode, at 25°C, on a flat, stable surface)]

Using earphones:

Battery type:Play time (Normal/ LP2/ LP4)

Rechargeable:29 hours/ 41 hours/ 48 hours

Panasonic

55 hours/ 74 hours/ 93 hours

alkaline:

Both together:87 hours/ 110 hours/ 113

hours

Using the speakers:

Battery type:Play time (Normal/ LP2/ LP4)

Rechargeable:9.5 hours/ 9.5 hours/ 9.5

hours

Panasonic alkaline:

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:

Charger output:DC 2V, 0.5 A

Recharging time:About 3.5 hours

15 hours/ 15 hours/ 15 hours

DC 3.5 V, 0.5A

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. Accessories

- Stereo earphones...................................................1 pc.

(L0BAB0000162)

- Wired remote control..............................................1 pc.

(N2QCBD000020)

- External battery case..............................................1 pc.

(K3ZZ00200041)

- Nickel-metal hydride rechargeable battery.............1 pc.

(RFKFHFAZ01EM)

- Soft case.................................................................1 pc.

(RFC0069-H)

- Speaker/battery carger...........................................1 pc.

(L0EAAB000002)

- AC adaptor...............................................................1 pc.

(N0JCBD000001)

2. Precaution of Laser Diode

3. Operating Instructions

4. Handling Precautions for MD Mechanism (Optical

pickup)

The laser diode in the MD mechanism (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 MD mechanism (optical pickup)

1. The MD mechanism (optical pickup) is an extremely high-precision construction and must not be subjected to impact, excessive 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. (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