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MD-MT20H/16E
Ð 2 Ð Figure 2-1 Figure 2-2 Precaution to be taken when replacing and servicing the Laser Pickup.
The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class I Requirements.
However, the following precautions must be observed during servicing to protect your eyes against exposure to the laser beam.
(1) When the cabinet has been removed, the power is turned on without a compact disc, and the Pickup is on a position
outer than the lead-in position, the Laser will light for several seconds to detect a disc. Do not look into the Pickup Lens.
(2) The Laser Power Output of the Pickup inside the unit and replacement service parts have already been adjusted prior
to shipping.
(3) No adjustment to the Laser Power should be attempted when replacing or servicing the Pickup.
(4) Under no circumstances look directly into the Pickup Lens at any time.
(5) CAUTION - Use of controls or adjustments, or performance of procedures other than those specified herein may result
in hazardous radiation exposure.
SAFETY PRECAUTION FOR SERVICE MANUAL
VARO ! Avattaessa ja suojalukitus ohitettaessa olet alttiina nŠkymŠttšmŠlle lasersŠteilylle. -lŠ katso sŠteeseen.
VARNING! Osynlig laserstralning nŠr denna del Šr šppnad och spŠrren Šr urkopplad. Betrakta ej strŠlen.
Precaution to be taken when replacing and servicing the laser pickup.
The following precautions must be observed during servicing to protect your eyesagainst exposure to the laser.
Warning of possible eye damage when repairing:
If the AC adaptor or batteries are connected when the top houising (disc cover) of the unit is removed, and the PLAY key is
pressed, the laser will light up during docus access (2-3 seconds). (Fig. 2-1) During the operation, the laser will lesk from the
opening btween the magnetic head and the mechanical chassis (Fig. 2-2). In order to protect your eyes, you most not look
at the laser durnd repaor. Before repaoring be sure to disconnect the AC adaptor and remove the batteries.
(For U.K.) (For Europe)
Laser Diode Properties
lMaterial: GaAlAs
lWavelength: 785 nm
lPulse time:
Read mode: 0.8 mW Continuous
Write mode: max 10 mW 0.5S
min cycle 1.5S
Repetition
VAROITUS! LAITTEEN KÄYTTÄMINEN MUULLA KUIN TÄSSÄ KÄYTTÖOHJEESSA
MAINITULLA TAVALLA SAATTAA ALTISTAA
KÄYTTÄJÄN TURVALLISUUSLUOKAN 1 YLITTÄVÄLLE
NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE.
VARNING - OM APPARATEN ANVÄNDS PÅ ANNAT SÄTT ÄN I DENNA BRUKSANVISNING
SPECIFICERAS. KAN ANVÄNDAREN UTSÄTTAS FÖR OSYNLIG LASERSTRÅLNING, SOM
ÖVERSKRIDER GRÄNSEN FÖR LASERKLASS 1.
LASER KLASSE 1
LUOKAN 1 LASERLAITE
KLASS 1 LASERAPPARAT
Magnet Head
Lasar Beam
Optical Pick-Up
Main PWB Spindle motor Mechanism
Chassis Magnet head
Optical pick-upTop Cabinet
Page 2
MD-MT20H/16E
Ð 3 Ð
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO
THE OPERATION MANUAL.
SPECIFICATIONS
Specifications for this model are subject to change without prior
notice
nGeneral
Power source:
(MD-MT20H for U.K.)DC 2.4V: Rechargeable Nickel-Metal Hydride battery x 1
DC 5V: AC adaptor (AC 230 - 240V, 50/60 Hz)
DC 3.0V: Commercially available, AA size, alkaline bat-
tery x 2
DC 4.5V: Separately available car adaptor, AD-CA20X
(
for cars with a 12-24V DC negative earth electricalsystem)
Power consumption:7 W (AC adaptor)
Output power:RMS; 20 mW (10 mW + 10 mW)
(0.2% T.H.D.)
Charging time:Approx. 4 hours (90 %)
Approx. 6 hours (fully charged)
(When using the AC adaptor included with the unit)
Battery life:
When using the rechargeable
battery (fully charged) included
with the unitWhen using two, commercially
available, high capacity, AA
size, alkaline batteries
Continuous recording:
Approx. 7.5 hoursContinuous recording:
Approx. 7.5hours
Continuous play:
Approx. 12 hoursContinuous play:
Approx. 15 hours
Power source:
(MD-MT20H for Europe)DC 2.4V: Rechargeable Nickel-Metal Hydride battery x 1
DC 5V: AC adaptor (AC 220 - 230V, 50/60 Hz)
DC 3.0V: Commercially available, AA size, alkaline bat-
tery x 2
DC 4.5V: Separately available car adaptor, AD-CA20X
(
for cars with a 12-24V DC negative earth electricalsystem)
Power source:
(MD-MT16E)DC 2.4V: Optional Rechargeable Nickel-Metal Hydride bat-
tery (AD-T20BT) x 1
DC 3.0V: Commercially available, AA size, alkaline bat-
tery x 2
DC 4.5V: Optional car adaptor, AD-CA20X
(
for cars with a 12-24V DC negative earth electricalsystem)
DC 5V: Optional AC adaptor (AD-T20APE, AC 230 - 240V,
50/60 Hz)
Power consumption:
(MD-MT16E)7 W (Optional AC adaptor)
Output power:
(MD-MT16E)RMS; 20 mW (10 mW + 10 mW)
(0.2% T.H.D.)
Charging time:
(MD-MT16E)Approx. 4 hours (90 %)
Approx. 6 hours (fully charged)
(When using the AC adaptor)
Battery life:
(MD-MT16E)
When using the optional re-
chargeable battery AD-T20BT
(fully charged) When using two, commercially
available, high capacity, AA
size, alkaline batteries
Continuous recording:
Approx. 7.5 hours Continuous recording:
Approx. 7.5 hours
Continuous play:
Approx. 12 hours Continuous play:
Approx. 15 hours
Unmeasurable (less than ±0.001% W. peak) lThe continuous recording time is for analogue inputs when the volume level is set to
VOL 0.
lThe continuous play time shows the value when the volume level is set to VOL 15.
lThe above values are the standard values when the unit is charged and used at an
ambient temperature of 20°C (68°F).
lThe operating time when using an alkaline batteries may be different, depending on
the type and manufacturer of the battery, and on the operating temperature.
Input sensitivity:
Recording level Reference input level Input impedance
MIC H 0.25 mV 10 k ohms
MIC L
2.5 mV 10 k ohms
LINE 100 mV 20 k ohms
Output level:
Specified
outputMaximum
output levelLoad
impedance
Earphones - 10 mW + 10 mW 32 ohms
LINE250 mV
(-12dB)-
10 k ohms
Dimensions:Width: 87.9 mm (3-7/16")
Height: 29.8 mm (1-3/16")
Depth: 79.7 mm (3-1/8")
Weight: (MD-MT20H)235 g (0.52 lbs.) with rechargeable battery
Input socket:Line/optical digital, microphone (powered by the main unit)
Output socket:Earphones (impedance: 32 ohms)/remote control unit
nMiniDisc Recorder
Type:Portable MiniDisc recorder
Signal readout:Non-contact, 3-beam semi-conductor laser pick-up
Audio channels:Stereo 2 channels/monaural (long-play mode) 1 channel
Frequency response:20 - 20,000 Hz (± 3 dB)
Rotation speed:Approx. 400 - 900 rpm
Error correction:ACIRC (Advanced Cross Interleave Reed-Solomon Code)
Coding:ATRAC (Adaptive Transform Acoustic Coding), 24-bit computed
type
Recording method:Magnetic modulation overwrite method
Sampling frequency:
44.1 kHz (32 kHz and 48 kHz signals are converted to 44.1 kHz ,
and then recorded.)
Wow and flutter:
Weight: (MD-MT16E)180 g (0.40 lbs.) without battery
