General
Power source
DC
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3.6 V (rechargeable lithium-ion
battery NB-L10A x 1)
DC 5 V (AC adaptor)
AC 230 V, 50 Hz
DC 3 V
Separately available battery case
(commercially available, "AA"
size, alkaline battery x 2)
DC 4.0 V : Separately available car
adaptor, DC-C70
(for cars with a 12-24 V DC
negative earth electrical system)
Power consumption
7 W (AC adaptor)
Output power
RMS; 20 mW (10 mW + 10 mW)
(0.2 % T.H.D.)
Charging time
Approx. 3.0 hours
(When using the AC adaptor included
with the unit)
Battery life
Note:
The battery case is only sold in certain areas. For more details,
please ask your dealer.
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 charged
and used at an ambient temperature of 20
o
C.
The operating time when using alkaline batteries may be different,
depending on the type and manufacturer of the batteries, and on
the operating temperature.
Input sensitivity
Output level
Dimensions
Width: 87.0 mm (3-7/16")
Height: 29.4 mm (1-3/16")
Depth: 81.5 mm (3-7/32")
Weight
219 g (0.49 lbs.) with rechargeable
battery
Input socket
Line/optical digital, microphone
(powered by the main unit)
Output socket
Headphones (impedance: 32
ohms)/remote control unit
MiniDisc Recorder
Type
Portable MiniDisc recorder
Signal readout
Non-contact, 3-beam semi-coductor
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
Unmeasurable (less than
±
0.001% W.peek)
Continuous recording:
Approx. 4.5 hours
Continuous recording:
Approx. 4 hours
Continuous recording:
Approx. 8.5 hours
Continuous play:
Approx. 6.5 hours
Continuous play:
Approx. 8 hours
Continuous play:
Approx. 14.5 hours
Headphones
—
10 mW +
32 ohms
10 mW
LINE
300mV (-12dB)
—
50 k ohms
Maximum
output level
Specified output
Recording level
Reference input level
Input impedance
MI C H
0.25 mV
10 k ohms
MIC L
2.5 mV
10 k ohms
LINE
100 mV
20 k ohms
Load
impedance
When using two,
commercially available,
high capacity, "AA" size,
alkaline batteries (in the
separately available battery
case)
When using the recharge-
able battery NB-L10A (fully
charged) included with the
unit
When using two, commercially
available, high capacity, "AA"
size batteries with the
rechargeable battery (fully
charged)
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DIGITAL EDIT & RECORDING
RECORDING
REC LEVEL
/CURSOR
CHARACTER
AUTO MARK
SYNC/F.PLAY
VOLUME/NAME
PORTABLE MD RECORDER DMC-J7R
BASS/DELETE MODE/INSERT
OPEN
DISP
EDIT
OFF
ENTER
E
JECT
PORTABLE MD RECORDER
DMC-J7R
SERVICE MANUAL
© 1998-6/B51-5441-00 (K/K) 3163
Transparency cover *
(B10-)
Knob
(K29-2270-08)
Bottom cabinet *
(A02-)
Front cabinet
(A02-2808-08)
MD cover
(F07-1638-08)
Knob
(K27-2272-08)
Upper case assy
(A02-2814-08) : S
(A02-2862-08) : B
Knob base
(A02-2816-08)
* Refer to parts list on page 26.
S: Silver, B: Blue
In compliance with Federal Regulations, following are reproduc-
tions of labels on, or inside the product relating to laser product
safety.
KENWOOD-Crop. certifies this equipment conforms to DHHS
Regulations No. 21 DFR 1040. 10, Chapter 1, Subchapter J.
DANGER : Laser radiation when open and interlock defeated.
AVOID DIRECT EXPOSURE TO BEAM
SPECIFICATIONS
DMC-J7R(K)
COVER1,1P(
98.11.30
1:44
PM
y [ W 2
