Service manual

– 5 –
MD-MT80W/90W/90/90C
MD-MT90/90C
■ General
Power source:
Battery life:
●
The continuous recording time is for analog inputs
when the volume level is set to "VOL 0".
●
The continuous play time shows the value when the
volume level is set to "VOL 15".
●
The above values are the standard values when the
unit is charged and used at an ambient temperature of
77°F (25°C).
●
The operating time when using an alkaline battery
may be different, depending on the type and manufac-
turer of the battery, and on the operating temperature.
DC 1.2V: Rechargeable Nickel-Metal Hydride
battery (AD-N70BT) x 1
DC 5V: AC adaptor (AC 120V, 60 Hz)
DC 1.5V: Commercially available, "AA" size
(LR6), alkaline battery x 1
DC 4.5V: Optional car adaptor, AD-CA20X(for
cars with a 12 - 24V DC negative
ground electrical system)
Power con-
sumption:
7 W (AC adaptor)
Output pow-
er:
RMS; 20 mW (10 mW + 10 mW)
(0.2% T.H.D.)
Charging
time:
Approx. 3.5 hours (90 %)
Approx. 5.5 hours (fully charged)
(When using the AC adaptor included
with the unit)
When using the recharge-
able battery (fully charged)
included with the unit
When using a commercial-
ly available, high capacity,
"AA" size (LR6), alkaline
battery
Continuous recording:
Approx. 7 hours
Continuous recording:
Approx. 3 hours
Continuous play:
Approx. 12 hours
Continuous play:
Approx. 12 hours
Input sensitivity:
Output level:
■ MiniDisc Recorder
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
Specified
output
Maximum
output level
Load im-
pedance
Headphones - 10 mW + 10
mW
16 ohms
LINE 250 mV
(-12 dB)
- 10 k ohms
Dimensions:
Width: 3-7/32" (81.1 mm)
Height: 13/16" (19.9 mm)
Depth: 3-21/32" (92.4 mm)
Weight:
0.38 lbs. (172 g) with rechargeable bat-
tery
Input jack:
Line/optical digital, microphone (pow-
ered by the main unit)
Output jack:
Headphones (impedance: 16 ohms)/
remote control unit
Type:
Portable MiniDisc recorder
Signal read-
out:
Non-contact, 3-beam semiconductor
laser pickup
Audio chan-
nels:
Stereo 2 channels/monaural (long-play
mode) 1 channel
Frequency
response:
20 - 20,000 Hz (±3 dB)
Rotation
speed:
Approx. 400 - 900 rpm
Error correc-
tion:
ACIRC (Advanced Cross Interleave
Reed-Solomon Code)
Coding:
ATRAC (Adaptive TRansform Acoustic
Coding), 24-bit computed type
Recording
method:
Magnetic modulation overwrite method
Sampling fre-
quency:
44.1 kHz (32 kHz and 48 kHz signals
are converted to 44.1 kHz, and then re-
corded.)
Wow and
flutter:
Unmeasurable (less than ±0.001% W.
peak)