JVC TD-W254 User Manual

2. Installation
1) Avoid placing the unit on or adjacent to an amplifier, to pre-
vent hum from being produced by some types of amplifiers.
Move the unit to a place not affected by the amplifier. Keep
the unit as far as possible from a TV set.
2) Avoid installing the unit in a location subject to ambient tem-
peratures exceeding 40 °C (104 °F) (e.g. direct sunlight,
near heaters, etc.) or less than 0 °C (32 °F), excessive
humidity, dust or vibrations.
3) If this set is moved suddenly from a cold place (0 °C) to a
warm place, it may not function properly because of moisture
generated inside the unit. The unit will function properly
30 minutes after being moved.
3. Cleaning the cabinet
Never use benzine or thinner for cabinet cleaning as they may
damage the surface finish.
4. Cassette tape
1) Loose tape may become tangled in the tape transport
mechanism. Remove slack by winding the tape with a pen-
cil.
(Fig. 2)
Fig. 2
Turn the pencil to tighten the tape.
2) The use of C-120 (120 minutes turn around) or thinner tape
is not recommended, since characteristic deterioration may
occur.
3) To prevent recordings from being erased accidentally,
remove the tab(s) with a screwdriver. Reseal the slots with
adhesive tape to erase and re-record after the tabs have
been broken off.
Fig. 3
4) Do not store cassette tapes where there is a magnetic field
(e.g. near a TV, etc.) or in a place subject to high tempera-
tures or humidity.
5. Auto tape select mechanism (decks A and B)
This deck has an Auto Tape Select mechanism which distin-
guishes between different types of tape from holes in the
cassette. After the type of tape has been detected, bias and
equalization are set to be suitable for the tape.
•
Cassettes with the detection holes:
Metal tape (EQ: 70µs) ........................................ Type IV
CrO
2 (chrome) tape (EQ: 70µs) .......................... Type II
•
Cassettes without the detection holes:
Normal tape (EQ: 120µs) ..................................... Type I
Some earlier types of metal and CrO
2 (chrome) tapes may
not be provided with the detection holes. Avoid using such
tapes, since correct equalization characteristics cannot be
obtained. Also do not use ferrochrome tapes whose charac-
teristics do not match this unit.
6. Operations
1) Noise may be generated if the
POWER switch is
switched OFF with the deck set to playback or recording
mode. Before switching the
POWER switch OFF, confirm
that the
(stop) button has been pressed. (B version)
2) Many operations of this unit are performed under the control
of a microcomputer. Use the unit only after carefully studying
the descriptions and cautions in each item. If operations are
done incorrectly, the unit may stop functioning correctly. If
this happens, for the J version, unplug the power cord and
for the B version, set the
POWER switch to OFF, so
that the unit can function correctly.
Side ‘‘A’’
Tab ‘‘B’’ Side ‘‘B’’ Tab ‘‘A’’
Adhesive tape
CrO 2 tape detection
holes
Metal tape detection holes
–4–
id8/i10371/ 11/25/96 Page 4

JVC TD-W254 Specifications

Tape Specifications

track system	4-track, 2-channel
tape speed normal	4.8 cm/sec (1-7/8 inch/sec)
tape speed high	9.5 cm/sec (3-3/4 inch/sec)

Frequency and Sound

frequency response Type IV tape	20–17, 000 Hz
s/n ratio	58 dB (S = 315 Hz, k3 = 3%, N = A-weighted, Type IV tape)
wow and flutter	0.08% (WRMS), ±0.2% (DIN/IEC)

Power

power requirement B version	AC 230 V, 50 Hz
power requirement J version	AC 120 V, 60 Hz
power consumption on	17 W

Input/Output

line in input sensitivity	80 mV (0 VU)
line out output level	300 mV (0 VU)
phones output level	0.3 mW/8 Ω (0 VU)

Dimensions and Weight

dimensions	435 x 139 x 331 mm (W x H x D)
weight B version	5.0 kg
weight J version	4.8 kg