JVC Service Manual

SPECIFICATION

Provided Accessories

• Instructions × 1
• AC adaptor × 1
• Connection cord × 1 (3.5 mm dia. stereo mini plug - 3.5 mm dia. stereo mini plug : 2.2 m (7.22 ft))
• Conversion cord × 1 (3.5 mm dia. stereo mini jack - RCA pin plug × 2 : 0.1 m (0.33 ft))
• Rechargeable Ni-MH battery × 2
• Plug adaptor × 1 (converts 3.5 mm dia. stereo mini plug to a 6.3 mm dia. standard stereo phone plug)

Design and specifications subject to change without notice.

COPYRIGHT © 2006 Victor Company of Japan, Limited

SECTION 1 PRECAUTION

1.1 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 manufacturer 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 reassembling.
5. Leakage shock hazard testing: After reassembling 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 part 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 per volt or more sensitivity in the following manner. Connect a 1,500Ω 10W resistor paralleled by a 0.15µF 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 each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

   Diagram Description: A diagram illustrates the leakage shock hazard testing setup. It shows an AC IN connection to a transmitter, which is connected wirelessly to a receiver (headphones). A separate test setup is depicted with an AC Voltmeter (described as having 1000 ohms/volts or more sensitivity). A 1500 ohm 10 watt resistor is connected in parallel with a 0.15 microfarad AC-type capacitor. This combination is placed between an exposed metal part of the device and a "Good earth ground". The voltmeter is connected across the resistor. The text indicates to place the voltmeter probe on each exposed metal part.

1.2 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.

1.3 Caution

Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.

1.4 Critical parts for safety

In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor (represented by a rectangle symbol), diode (represented by a triangle with a line symbol), and ICP (Integrated Circuit Package) or identified by the [critical part indicator] mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (This regulation does not except the J and C version)

SECTION 2 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)

Diagram Description: An exploded view diagram of the JVC HA-W600RF headphones is shown, illustrating the disassembly process. Key components labeled include: Ear pad, End pin, Sub band ass'y, Head band, Hanger cover (L), Hanger (L), Hanger cover (R), Hanger (R), Driver unit ass'y (L), Driver unit ass'y (R), Battery cover, Main P.C.B. Ass'y, Power P.C.B. Ass'y, Battery contact, and Housing (R). Screws are indicated by letters A, B, C, D, and E.

Remove the driver unit ass'y (R) and power P.C.B. ass'y

1. Ear pad and battery cover are removed.
2. Remove the three screws A attaching the driver unit ass'y (R).
3. Remove the two screws B attaching the power P.C.B. ass'y.
4. The solder of each wire connected with driver unit ass'y (R) and power P.C.B. ass'y is removed.

* Please confirm that it is in the ditch where battery contact (four places) on the power P.C.B ass'y exists in housing (R) when you install the power P.C.B. ass'y in housing (R).

Remove the driver unit ass'y (L) and main P.C.B. ass'y

1. Ear pad is removed.
2. Remove the three screws C attaching the driver unit ass'y (L).
3. Remove the two screws D attaching the main P.C.B. ass'y.
4. The solder of each wire connected with driver unit ass'y (L) and main P.C.B. ass'y is removed.

Remove the sub band ass'y

1. Remove the two screws E attaching the hanger cover (L) and (R).
2. Right and left end pin is removed.

Remove the head band ass'y

Prior to performing the following procedure, remove the driver unit ass'y (L/R), power P.C.B. ass'y, main P.C.B. ass'y, sub band ass'y.

1. Head band ass'y is removed while drawing out the wire from ditches that exist in hanger (L/R) and head band ass'y.

SECTION 3 TROUBLESHOOTING

3.1 Measurement Condition

Diagram Description: A diagram illustrates the measurement setup for troubleshooting. It shows a "Transmitter" unit connected to "AC IN" and a "Receiver (Headphones)" unit. The distance between them is indicated as "1m (3.28ft)". The conditions are specified as: Reference input signal: 1kHz 350mVp-p sine wave; Headphone volume control: MAX.