JVC HA-W400RF Cordless FM Stereo Headphones Services Manual

JVC HA-W400RF Cordless FM Stereo Headphones Services Manual

Specifications

General Specifications

• System : Radio Frequency (UHF stereo)
• Modulation : Frequency modulation
• Carrier frequency Usable area : 863-865 MHz
• (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)

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

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 alterations 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 perform 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, particularly 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.).

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.

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

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 automatically 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 equipment

NAMES OF PARTS AND THEIR FUNCTIONS

Transmitter

1. POWER (Indicator)
   When an audio signal is input : The power automatically turns on and the indicator lights in green.
2. CHARGE (Indicator)
   The indicator lights in red while the battery is being charged.
3. TUNING (Tuning control) Adjusts the transmission frequency.
4. ANTENNA
5. ANTENNA COVER Cover the antenna 4 before using the unit.
6. Audio input cord and plug 2m cord and 3.5mm dia. stereo miniplug.
7. Charging output cord and plug
8. DC IN (DC 12 V jack)
9. 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.
10. Plug rest hole
    While not in use, charging output cord and plug 7 can be inserted into this hole.

Receiver (Cordless Headphones)

1. ON/OFF (Power switch)
2. Charging input terminal
3. VOL. (Volume control)
   Adjusts the volume level of the left and right channels simultaneously.
4. POWER (Indicator)
   The indicator lights in red when the power is turned on.
5. 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 transmitter or unexpected signals can also cause the frequency tuning to stop. If this happens, press the button again to resume tuning.
6. 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 them transmitter.

CONNECTION

How to connect to AV equipment

Connection to HEADPHONES jack

Connection to LINE OUT or REC OUT terminals

Connection to power supply

Note:
Be sure to use the provided exclusive AC adaptor (J46858-001) for connection. Use of any other AC adaptor may cause a malfunction.

RANGE OF USE

Note:
The usable area may differ depending on building structure, etc.
The range becomes shorter in the following cases:

Be sure to keep this unit more than 0.5 m/1.64 ft away from concrete walls, metal furniture, etc.

POWER REQUIREMENTS OF HEADPHONES

Use two exclusive rechargeable Ni-Cd batteries to power the headphones. When you purchase this unit, be sure to charge the provided rechargeable Ni-Cd batteries according to the following procedures before use.

Cautions about the rechargeable batteries

If the batteries are used incorrectly, they may leak, heat or explode, and may cause fire, injury or soiling. Make note of the following:

1. Be sure to use the provided exclusive Ni-Cd batteries. Do not use any other rechargeable Ni-Cd battery or dry cell battery.
2. Insert batteries with the (+) and (–) polarities correctly positioned, following the indications on the equipment.
3. Do not use a new battery with an old one, and do not use batteries holding different amounts of charge together.
4. Do not throw batteries in a fire or heat them.
5. Do not short-circuit the positive (+) and negative (–) terminals. Also, do not carry or store them with small metallic objects such as necklaces or coins.
6. Do not deform, take apart, modify or directly solder the batteries.
7. Do not remove or damage the covering tube.
8. If you notice phenomena that has never happened before, such as leakage, colour change or deformity, stop using the batteries.
9. If any liquid from the batteries gets into your eyes, it may cause blindness. If battery liquid does get into your eyes, do not rub them, but instead immediately wash them thoroughly with clean water, then consult a doctor at once. Also, should any liquid from the rechargeable batteries get onto your skin or clothes, it may burn your skin. In this case, wash with clean water immediately.
10. Do not immerse or wet the batteries in water.
11. Do not use or leave the batteries in an area where the temperature becomes significantly higher, such as in direct sunlight, inside a car on a hot day or near heat-generating equipment.
12. Do not subject the batteries to strong shocks or throw them.
13. Be sure to read the cautions on the batteries. Please consult your JVC dealer when exchanging the batteries.

POWER REQUIREMENTS OF HEADPHONES

 

1. Charging batteries that are not completely exhausted will cause efficiency to decline. Be sure to charge them after they have been completely exhausted. Set the ON/OFF (power) switch on the headphones to OFF.
   The batteries cannot be charged when the switch is set to ON.
2. Connect the charging output cord from the transmitter to the headphones.
3. Connect the AC adaptor to the transmitter.
4. Plug the AC adaptor into an AC outlet. The charger starts charging the batteries automatically and the transmitter’s indicator lights in red.

Charging time
The battery can be fully charged in approx. 24 hours.

Battery running time

After charging is complete, you can use them continuously for approx. 6 hours. Tips for better use

• Be sure to charge the batteries within the temperature range of 10° C ~ 35° C (50 °F ~ 95 °F ).
• Charging batteries that are not completely exhausted will cause efficiency to decline. Be sure to charge them after they have been completely exhausted.

CAUTIONS ABOUT CHARGING

1. Be sure to use only this unit for charging.
2. You can charge the rechargeable Ni-Cd batteries approx. 300 times.
3. Charging times differ depending on the temperature range or the amount of charge already in the batteries.
4. Excessive charging doesn’t result in malfunction.
5. Battery life will decrease in cold places.
6. If the usable time of fully-charged batteries decreases by about half, replace them with new ones. When purchasing rechargeable Ni-Cd batteries, consult the dealer from whom you bought this product.
   Exclusive Rechargeable Ni-Cd Batteries : J46863-001 (1.2 V, 240 mAh, 2 pcs/pack)
7. Though the rechargeable batteries may become hot after they have been charged or used, this is not malfunction.
8. Due to characteristics of the batteries, they expend their charge a little even when the power is turned off.

HOW TO USE

1. Connect the transmitter and AV equipment. (Refer to page 6)
2. Connect the AC adaptor to the transmitter, then plug the AC adaptor into an AC outlet. (Refer to page 7)
3. Turn on the power on the transmitter and the connected AV equipment.
   Transmitter power
   When an audio signal is input, the transmitter’s power is turned on automatically, and the indicator lights in green. Also, when no audio signal is input for about a minute, the indicator goes out automatically and the power turns off. (Automatic Power On/Off function) In some situations, the power may not be turned on automatically by the input sound (e.g. a song with a quiet opening or gradual fade-in). This is not a malfunction.
4. Turn on the headphones’ power. To avoid excessive volume, first set the headphones’ volume to a low level.
   Before using the headphones for the first time, charge the rechargeable Ni-Cd battery.
5. Adjust the volume control of the connected AV equipment and the headphones, and set them to the desired listening level.
6. Push the AUTO TUNING switch control to get the best reception in the headphones.
   When the button is pressed, frequency tuning starts automatically and it stops when a signal is detected.
   Note :
   Signals not originating from the transmitter or unexpected signals can also cause the frequency tuning to stop. If this happens, press the button again to resume tuning.
   In cases of interference or too much noise, turn the TUNING control on the transmitter to another position, then repeat step 6.

To set optimum signal reception, adjustments should be done within a range of approx. 7 m/23 ft between the transmitter and the headphones.

Tips for better use
For improved sound quality, set the volume level of the connected equipment as high as possible without causing distortion, while setting the volume level of the headphones to a slightly lower level.

TROUBLESHOOTING

What appears to be a malfunction may not always be serious. First make sure.

Symptoms	Cause	Remedy
No sound.	Is the transmitter’s power OFF?	Check the connection of the transmitter.
		Turn the power on the connected AV equipment ON and start playing.
	Is the headphones’ power OFF?	Turn on the headphones’ power. (The indicator lights.)
	Is the battery in the headphones exhausted?	Fully charge the headphones.
	Is the volume of the headphones set to the minimum level?	Adjust the volume of the head- phones to the appropriate level.
	Is the volume of the connected AV equipment set to the minimum level?	Raise the volume level of the connected AV equipment as high as possible without causing distortion.
No sound from the R-channel.	Is the transmitter connected to equipment with monaural audio output?	Connect them with an optional plug adaptor. (Converts monaural audio output to stereo audio output.)
Distorted sound.	Is the battery in the headphones exhausted?	Fully charge the headphones.
	Is the volume of the connected AV equipment set too high?	Adjust the volume level of the connected AV equipment as high as possible without causing distortion.
Noisy sound.	Is the battery in the headphones exhausted?	Fully charge the headphones.
	Are the frequency modulation signals being received correctly?	Push the AUTO TUNING switch on the headphones or turn the TUNING controls on the transmit- ter to adjust them until the headphones’ indicator lights in green.
	Is the volume of the connected AV equipment set too low?	Adjust the volume level of the connected AV equipment as high as possible without causing distortion.
	Are the headphones too far away from the transmitter?	Use them within the range the frequency modulation signal can reach. (Refer to page 8.)
Battery charging is impossible.	Has the rechargeable Ni-Cd battery expired?	Replace it with a new Ni-Cd battery. Please consult your dealer for replacement.

SPECIFICATIONS

General Specifications

Modulation system : Stereo frequency modulation system Carrier frequency : 863 – 865 MHz

Usable area

(distance to reach) : Approx. 100 m (328 ft)

(using JVC measurement systems) Frequency response : 28 –14,000 Hz

Distortion : Less than 4% (at 1 kHz)

Transmitter (J21967-002)

Power requirements : DC 12 V (with the exclusive AC adaptor J46858 –001) Audio input terminal : 3.5 mm dia. stereo miniplug

Input impedance : 35 kW 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)

Weight : 200 g (7.1 oz) (Without connection cord and AC adaptor)

Headphones (HA-W400RF)

Power requirements : Rechargeable Ni-Cd battery (1.2 V) x 2 Battery running time : 6 hours (When charged for 24 hours)

Weight : 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 minijack — RCA pin plug x 2 : 0.1 m (0.3 ft))

Plug adaptor x 1 (converts 3.5 mm dia. stereo miniplug to a 6.3 mm dia. standard stereo phone plug)

Exclusive rechargeable

Ni-Cd battery x 2

Design and specifications subject to change without notice.

Disassembly

Transmitter
In case of some problems arise in this transmitter unit, have to change the transmitter unit itself, due to avoid the law of radio regulation.
Receiver(Headphones

1. Remove the ear pad 1 and the cushion 2 from the driver unit ass’y (L) 3 and (R)
2. Remove the screw 5 and pull up the driver unit ass’y(L) 3 and (R) 4.
3. At channel R. remove the screw 6 and pull up the charge print circut board 7.
4. Remove the battery door 9 from the housing ass’y (R) 8.
5. At channel L. Remove the main print circut board 0 from the housing (L) -.
6. Remove the tuning switch knob =.
7. Remove the wire with solder from the charge and main print circut board 70, then remove the headband ass’y ~

DOWNLOAD PDF

JVC HA-W400RF Cordless FM Stereo Headphones Services PDF haw400rf_compressed