Technics SJ-HD501 Building instructions

ORDER No.AD9907180C2
Mini Disc Deck
SJ-HD501
Mechanism unit: MR3A (RAJ3402) Mechanism Series
Colour
(N)...................Gold Type
Areas
EG...................Europe.
EB...................Great Britain.
This product is option for systems of SC-HD301 and
SC-HD501.
SPECIFICATIONS
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Specifications
•System Minidisc digital audio system
Recording Magnetic field modulation
direct overwrite
Reading Non-contact optical system
with Semiconductor laser
(=780nm)
Sampling
frequency: 44.1 kHz
Cording system: ATRAC
Channel: 2channel, stereo
Frequency
response: 10-20000Hz (±0.3dB)
S/N Ratio (PLAY): 90dB
Wow and flutter: Below measurable limit
•Input
Analog input
(Level/impedance):
500mV/47kΩ
ΩΩ
Ω
Digital input
(Optical in 1,
Optical in 2)
Wavelength:
660nm
•Output
Analog output
(Level/impedance):
2.0V/600Ω
ΩΩ
Ω
•General
Dimensions
(WxHxD): 196x104x237mm
Weight: 2.0kg
Power supply: AC230-240V, 50Hz
Power
consumption: 12W
Notes:
1.Design and specifications are subject to
change without notice.
2.Dimensions and weight are approximate.
3.Total harmonic distortion is measured by the
digital spectrum analyzer.
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1. Accessories
- AC power supply cord...............1pc.
- Optical cable...............1pc.
(RJL1X001B05D)
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- Remote control batteries...............2pcs.
[R6/LR6 (AA, UM-3) ]
Note:These are available on sales route.
- Stereo phono cables...............2pcs.
(RJL2P004B08)
- Remote control transmitter...............1pc.
(EUR645272)
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2. Precation of Laser Diode
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3. Caution for AC Main Lead
4. Operating Instructions
5. Handling Precautions for Traverse Deck (MD Unit)
The laser diode in the MD unit (optical pickup) may break down due to potential
difference caused by static electricity of clothes or human body.So, be careful of
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electrostatic breakdown during repair of the MD unit (optical pickup).
5.1. Handling of MD Unit (optical pickup)
1. Do not subject the MD unit (optical pickup) to static electricity as it is extremely
sensitive to electrical shock.
2. The short land between the No. 25 (LD-GND) and No. 24 (LD) pins on the flexible
board is shorted with a solder build-up to prevent damage to the laser diode. (As
shown in Fig. 1.)
To connect to the PC board, be sure to open by removing the solder build-up, and
finish the work quickly.
3. Take care not to apply excessive stress to the flexible board (FFC).
4. Do not turn the variable resistor (laser power adjustment). It has already been
adjusted.
Fig. 1
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5.2. 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. 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.
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
6. Operation Checks and Main Component Replacement
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Procedures
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