Service manual

MD-SR50H/50W/60E/60W
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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
Input sensitivity:
Output level: (MD-SR50H/SR50W)
Output level: (MD-SR60W/SR60E)
Dimensions: Width: 99.9 mm (3-15/16")
Height: 22.9 mm (29/32")
Depth: 77.9 mm (3-3/32")
Weight: 168 g (0.37 lbs.) without battery
( MD- SR50H/SR50W)
Weight: 191 g (0.42 lbs.) with rechargeable
( MD- SR60W/SR60E) battery
Input socket: Line/optical digital, microphone
(powered by the main unit)
Output socket: Earphones (impedance: 32 ohms)
( MD- SR50H/SR50W)
Output socket: Headphones (impedance: 16 ohms)/
( MD- SR60W/SR60E) remote control unit
MiniDisc Recorder
Type: Portable MiniDisc recorder
Signal readout: Non-contact, 3-beam semi-conductor
laser pick-up
Audio channels: Stereo 2 channels/monaural (longplay
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: 44.1kHz (32 kHz and 48kHz signals
are converted to 44.1kHz, and then
recorded)
Wow and flutter: Unmeasurable
(less than ±0.001% W. peek)
General
Power source: DC 5V : AC adaptor (AC 220-230V, 50/60 Hz)
(MD-SR50H) DC 1.5V: Commercially available, "AA" (LR6)
size, alkaline battery x 1
DC 1.2V: Optional rechargeable Nickel-Metal
Hydride battery (AD-N70BT) x 1
DC 4.5V: Optional car adaptor, AD-CA20X
(for cars with a 12-24V DC negative
earth electrical system)
Power source: DC 5V : AC adaptor (AC 110-240V, 50/60 Hz)
(MD-SR50W) DC 1.5V: Commercially available, "AA" size
(LR6), alkaline battery x 1
DC 1.2V: Optional rechargeable Nickel-Metal
Hydride battery (AD-N70BT) x 1
DC 4.5V: Separately available car adaptor,
AD-CA20X (for cars with a 12-24V
DC negative earth electrical system)
Power source: DC 1.2V: Rechargeable Nickel-Metal Hydride
(MD-SR60E) battery (AD-N70BT) x 1
DC 5V : AC adaptor (AC 230-240V, 50/60 Hz)
DC 1.5V: Commercially available, "AA" size
(LR6), alkaline battery x 1
DC 4.5V: Separately available car adaptor,
AD-CA20X (for cars with a 12-24V
DC negative earth electrical system)
Power source: DC 1.2V: Rechargeable Nickel-Metal Hydride
(MD-SR60W) battery (AD-N70BT) x 1
DC 5V : AC adaptor (AC 220V, 50 Hz)
DC 1.5V: Commercially available, "AA" size
(LR6), alkaline battery x 1
DC 4.5V: Separately available car adaptor,
AD-CA20X (for cars with a 12-24V
DC negative earth electrical system)
Power consumption: 7W (AC adaptor)
(MD-SR50H/60E)
Power consumption: 0.15A (AC adaptor)
(MD-SR50W)
Power consumption: 6W, 0.06A (AC adaptor)
(MD-SR60W)
Output power: 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)
Battery life: (MD-SR50H/SR50W)
Battery life: (MD-SR60W/SR60E)
The continuous recording time is for analogue input 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 charg-
ed and used at an ambient temperature of 20˚C (68˚F).
Earphones — 10 mW + 10 mW 32 ohms
LINE 250 mV (-12 dB) — 10 kohms
Maximum
output level
Load
impedance
Specified
output
When using a commercially available,
high capacity, "AA" (LR6) size,
alkaline battery
When using the optional rechargeable
batter AD-N70BT(full charged)
Continuous recording
Approx. 3 hours
Continuous recording
Approx. 4.5 hours
Continuous play
Approx. 7 hours
Continuous play
Approx. 6.5 hours
MIC H 0.25 mV 10 kohms
MIC L 2.5 mV 10 kohms
LINE 100 mV 20 kohms
Recording
level
Reference
input level
input
impedance
When using a commercially available,
high capacity, "AA" size (LR6),
alkaline battery
When using the rechargeable batter
(full charged) included with the unit
Continuous recording
Approx. 3 hours
Continuous recording
Approx. 4.5 hours
Continuous play
Approx. 7 hours
Continuous play
Approx. 6.5 hours
Headphones — 10 mW + 10 mW 16 ohms
LINE 250 mV (-12 dB) — 10 kohms
Maximum
output level
Load
impedance
Specified
output
The operation time when using an alkaline battery may be
different, depending on the type and manufacturer of the battery
and on the operating temperature.