JVC HA-W400RF Service Manual

SERVICE MANUAL
CORDLESS FM STEREO HEADPHONES
HA-W400RF (EG)/(EK)

Specifications

General Specifications
System : Radio Frequency (UHF stereo)
Modulation : Frequency modulation
Carrier frequency : 863-865 MHz
Usable area
(distance to reach) : Approx. 100m (328 ft) : using
JVC measurements systems
Frequency response : 28 Hz-14 000 Hz
Distortion : Less than 4 % (at 1 kHz)
Transmitter (J21967-002)
Power requirements : DC 12 V (with the exclusive AC
adaptor J46857-001(EG Model)
Audio input terminal : 3.5 mm dia. stereo mini plug
Input impedance : 35 kΩ
Reference input level : 300 mV
Dimensions : 137(W) x 147(D) x 123(H) mm
(5-7/16" x 5-13/16" x 4-7/8")
(Including antenna)
Mass : 200 g (7.1 oz)
(Without connection cord and AC
adaptor)
/J46858-001(EK Model))
* Design and specifications subject to change without notice.
COPYRIGHT C 2000 VICTOR COMPANY OF JAPAN,LTD.
Contents
Specifications..................................... Front cover
1. Operating Manual........................................
2. Disassembly................................................
3. Schematic Diagram.....................................
4. Print Circuit Board......................................
5. Measurement Condition.............................. 14
6. Wiring Diagram...........................................
7. Block View Inside IC...................................
8. Block Diagram.............................................
9. Electric Parts List........................................
10. Exploded view.............................................
11. Mechanical Parts List.................................
12. Packing Method..........................................
13. Packing Materials.......................................
14. Accessories List.........................................
Headphones (HA-W400RF)
Power requirements : Rechargeable
Ni-Cd battery (1.2 V) x 2
Battery running time : 6 hours
(When charged for 24 hours)
Mass : 220 g (7.7 oz)
(With provided rechargeable
Ni-Cd battery x 2)
Provided Accessories
Instructions x 1
AC adaptor x 1
Connection cord x 1 (3.5 mm dia. stereo mini jack-
RCA pin plug x 2 : 0.1 m (0.3 ft))
Plug adaptor x 1 (converts 3.5 mm dia. stereo
mini plug to a 6.3 mm dia. standard
stereo phone plug)
Exclusive rechargeable Ni-Cd battery x 2
This product has Auto-tuning function.
On noisy frequency part, the receiver in headphone starts searching the
transmitted frequency and stop tuning on the frequency.
In the condition of disturbing frequencies and / or in the place at a distance
from transmitter, auto-tuning function could start searching by potential
noise and it causes sound breaks.
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No.70245
Jul.2000