JVC HAW-400-RF Service manual

HA-W400RF (EG)/(EK)

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)

/J46858-001(EK 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)

* Design and specifications subject to change without notice.

Contents

Specifications..................................... Front cover

1. Operating Manual........................................ 3

2. Disassembly................................................ 12

3. Schematic Diagram..................................... 13

4. Print Circuit Board...................................... 14

5. Measurement Condition.............................. 14

6. Wiring Diagram........................................... 16

7. Block View Inside IC................................... 16

8. Block Diagram............................................. 17

9. Electric Parts List........................................ 17

10. Exploded view............................................. 18

11. Mechanical Parts List................................. 18

12. Packing Method.......................................... 19

13. Packing Materials....................................... 19

14. Accessories List......................................... 19

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.

No.70245 Jul.2000

HA-W400RF (EG) /(EK)

Safety Precautions

1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.

2. Alterations of the design or circuitry of the product should not be made. Any design alter ations of the product should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.

3. Many electrical and mechanical parts in the products have special safety-related characteristics.

These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.

5. Leakage currnet check (Electrical shock hazard testing) After re-assembling the product, always perfor m an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this check.

Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage current from each exposed metal parts of the cabinet , particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.)

Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to eachexposed metal part, par ticularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Good earth ground

AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)

Place this probe on each exposed metal part.

Warning

1. This equipment has been designed and manufactured to meet international safety standards.

2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

3. Repairs must be made in accordance with the relevant safety standards.

4. It is essential that safety critical components are replaced by approved parts.

5. If mains voltage selector is provided, check setting for local voltage.

2 (No.70245)

1.Operating Manual

HA-W400RF (EK)

Printed in China

J5500-101A

VICTOR COMPANY OF JAPAN, LIMITED

CORDLESS FM STEREO HEADPHONES

J5500-101A

INSTRUCTIONS

HA-W400RF (EK)

CORDLESS FM STEREO HEADPHONES

HA-W400RF (EG)/(EK)

(No.70245) 3

HA-W400RF (EG) /(EK)

“SOME DO’S AND DON’TS ON THE SAFE USE OF EQUIPMENT”

This equipment has been designed and manufactured to meet international safety

standards but, like any electrical apparatus, care must be taken if you are to obtain

the best results and safety is to be assured.

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Do read the operating instructions before you attempt to use the equipment.

Do ensure that all electrical connections (including the plug, extension cord and

inter-connections between pieces of equipment) are properly made and in

accordance with the manufacturer’s instructions. Switch off and withdraw the

plug when making or changing connections.

Do consult your dealer if you are ever in doubt about the installation or operation or

safety of your equipment.

Do be careful with glass panels or doors on equipment.

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DON’T continue to operate the equipment if you are in any doubt about it working

normally, or if it is damaged in any way—switch off—withdraw the plug and

consult your dealer.

DON’T remove any fixed cover as this may expose dangerous voltages.

DON’T leave equipment switched on when it is unattended unless it is specifically

stated that it is designed for unattended operation or has a standby mode.

Switch off using the switch on the equipment and make sure that your family

know how to do this.

Special arrangements may need to be made for infirm or handicapped

people.

DON’T use equipment such as personal stereos or radios so that you are distracted

from the requirements of road safety. It is illegal to watch television when

driving.

DON’T listen to headphones at high volume as such use can permanently damage

your hearing.

DON’T obstruct the ventilation of the equipment, for example with curtains or on

soft furnishings.

Overheating will cause damage and shorten the life of the equipment.

DON’T use makeshift stands and NEVER fix legs with wood screws. To ensure

complete safety always fit the manufacturer’s approved stand or legs with

the fixing screws supplied according to the instructions.

DON’T allow electrical equipment to be exposed to rain or moisture.

ABOVE ALL

NEVER let anyone especially children push anything into holes, slots or any

other opening in the case. This could result in a fatal electrical shock.

NEVER guess or make changes with electrical equipment of any kind. It is

better to be safe than sorry!

DECLARATION OF CONFORMITY

Victor Company of Japan, Ltd.

12,3-chome

Moriya-cho, kanagawa-ku

YOKOHAMA (kanagawa) 221-8528, Japan

declare on our sole responsibility, that the product

HA-W400RF (JVC Brand) Stereo Wireless Headphone System

to which this declaration relates is in conformity with the following standard(s) or other

normative document(s):

EN 301 357 V1.1.1 (July 1999)

EN 300 220-1 (November 1997)

TCF reference:RFI/TCFB1/RP40782(Notified Body No. used:889)

ETS 300 683 (1997)

EN 60950 (1992) with amendments A1 (1993), A2 (1993), A3 (1995), A4

(1997) and A11 (1997)

following the provisions of the Radio Equipment and T elecomm unications Terminal

Equipment Directive 1999/5/EC, using the conformity assessment procedures from

the EMC Directive 89/336/EEC and the LVD 73/23/EC for EMC (Article 3.1b) and

Safety (Article 3.1a) respectively.

Place and date of issue Manufacturer/Authorized representative

name and signature

CORDLESS FM STEREO HEADPHONES

OPERATING AT 863 MHz TO 865 MHz

ACCORDING TO THE USED FREQUENCY BAND THIS DEVICE IS INTENDED TO

USE IN GERMANY, THE UK, FRANCE, AUSTRIA, THE NEDERLANDS, SWEDEN,

NORWAY, DENMARK, FINLAND

4 (No.70245)

HA-W400RF (EG)/(EK)

CAUTION

To reduce the risk of electrical shocks, fire, etc.:

1. Do not remove screws, cover or cabinet.

2. Do not expose this appliance to rain or moisture.

IMPORTANT

1. Installation

● Select a place which is level, dry

and neither too hot nor too cold

(between 0°C and 35°C /32°F and

95°F).

● Keep away from direct sunlight.

● Do not put it too close to a heater.

2. Power cord

● Do not handle the power cord with

wet hands!

● Do not bend the power cord

sharply.

3. Malfunctions, etc.

● There are no serviceable parts

inside. If anything goes wrong,

unplug the power cord and consult

your dealer.

● Do not insert any metallic object.

● Do not allow water to get inside.

CAUTION:

CHARGE ONLY WITH PROVIDED NICKEL-CADMIUM TYPE

BATTERIES. OTHER TYPES OF BATTERIES MAY BURST

CAUSING PERSONAL INJURY AND DAMAGE.

Thank you for purchasing this JVC product.

Before you begin operating this unit, please read the instructions carefully to be

sure you get the best possible performance.

If you have any questions, consult your JVC dealer.

FEATURES

● Frequency modulation system which

allows headphones to be used even in

areas where the transmitter cannot be

seen

● Reception range (up to 100 m (328 ft):

using JVC measurement system)

● Auto Tuning Function: Lock in the

signal at the touch of a button

● Foldable and compact design

● Easy-to-handle light body

● Rechargeable system with Ni-Cd

batteries provided

● Large 40 mm dia. drivers for high-

quality sound

● Automatic Power On/Off transmitter

● Auto-level control circuit that automati-

cally adjusts signals to the appropriate

modulation level

● Single volume control adjusts the

volume level of the left and right

channels simultaneously

● Adaptable to any audio/visual equip-

ment

NAMES OF PARTS AND THEIR FUNCTIONS

Transmitter

POWER (Indicator)

When an audio signal is input : The

power automatically turns on and the

indicator lights in green.

CHARGE (Indicator)

The indicator lights in red while the

battery is being charged.

TUNING (Tuning control)

Adjusts the transmission frequency.

ANTENNA

ANTENNA COVER

Cover the antenna

before using

the unit.

Audio input cord and plug

2m cord and 3.5mm dia. stereo

miniplug.

Charging output cord and plug

DC IN (DC 12 V jack)

AC adaptor (J46858-001)

Connects to a household AC outlet

(AC 230 V, 50 Hz).

Note :

The provided AC adaptor is exclusively

for use with this unit.

Do not connect to any other equipment.

Plug rest hole

While not in use, charging output

cord and plug

can be inserted

into this hole.

Insert the antenna

into

the antenna cover

before using the unit.

(No.70245) 5

HA-W400RF (EG) /(EK)

NAMES OF PARTS AND THEIR FUNCTIONS

Receiver (Cordless Headphones)

ON/OFF (Power switch)

Charging input terminal

VOL. (Volume control)

Adjusts the volume level of the left

and right channels simultaneously.

POWER (Indicator)

The indicator lights in red when the

power is turned on.

AUTO TUNING SWITCH (Tuning

control)

Adjusts the reception frequency.

When the button is pressed,

frequency tuning starts automatically

and it stops when a signal is

detected.

Note :

Signals not originating from the trans-

mitter or unexpected signals can also

cause the frequency tuning to stop. If

this happens, press the button again to

resume tuning.

STEREO (Indicator)

The indicator lights in green when

receiving the signal from the

transmitter.

Note :

The indicator also lights in green with

signals not originating from the

transmitter.

䡵

How to connect to AV equipment

Connection to HEADPHONES jack

CONNECTION

Connection to LINE OUT or REC OUT terminals

TV, audio amplifier,

VCR, tape deck,

video disc player,

etc.

To LINE OUT or REC

OUT terminals

L-channel

(white plug)

R-channel

(red plug)

Provided

connection cord

When connecting to a standard stereo phone jack

(6.3 mm dia.)

— Use the provided plug adaptor

(Converts a stereo miniplug to a standard stereo

phone plug)

When

connecting to a

stereo minijack

When connecting to a monaural minijack

— Use an optional plug adaptor

(Converts a stereo miniplug to a monaural miniplug)

TV, audio amplifier,

VCR, tape deck,

video disc player,

etc.

To HEADPHONES jack

6 (No.70245)

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