JVC HAW-500-RF Service manual

SERVICE MANUAL

CORDLESS FM STEREO HEADPHONES

HA-W500RF (EG)/(EK)

Specifications

HA-W500RF (EG)/(EK)

Contents

Specifications ------------ Front cover

1. Disassembly ------------------------- 3

2. Schematic Diagram ---------------- 4

3. Measurement Condition --------- 5

4. Print Circuit Board ----------------- 5

5. Wiring Diagram --------------------- 7

6. Block View Inside IC -------------- 7

7. Block Diagram ---------------------- 8

8. Electric Parts List ------------------ 8

9. Exploded view ----------------------- 9
10 .Mechanical Parts List ------------ 9

11. Packing Method ------------------ 10

12. Packing Materials Parts List - 10

13. Accessories List ----------------- 10

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 : 30 Hz-15,000 Hz
Distortion : Less than 4 % (at 1 kHz)

Transmitter (J22121-001)

Power requirements : DC 9 V (with the exclusive AC

adaptor J47126-001(EG Model)

/J47127-001(EK Model))

Audio input ter minal : 3.5 mm dia. stereo mini plug
Input impedance : 25 k
Reference input level : 300 mV
Dimensions : 100(W) x 100(D) x 106(H) mm

(3-15/16" x 3-15/16" x 4-3/16")
(Including antenna)
: 115

Mass

(4.1 oz)
(Without connection cord and AC
adaptor)

Headphones (HA-W500RF)

Power requirements : Rechargeable

Ni-Cd batter y (1.2 V) x 2

Battery running time : 20 hours

(When charged for 24 hours)

Mass : 280

Provided Accessories

Instructions x 1
AC adaptor x 1
Connection cord x 1 (3.5 mm dia. stereo mini jack-

Plug adaptor x 1 (converts 3.5 mm dia. stereo

(9.9 oz)
(With installed rechargeable
Ni-Cd batter y x 2)

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

mini plug to a 6.3 mm dia. standar d
stereo phone plug)

* Design and specifications subject to change without notice.

COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.

No.70270

Sep. 2002

HA-W500RF (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 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.).

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.70270)

1.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)

HA-W500RF (EG)/(EK)

L

10

9

11

12

2

8

7

6

1

5

4

4

15

R

4

1

4

3

13

R

14

R

1.Remove the ear pad 1 from the driver unit ass'y (L) 2 and (R) 3.

2.Remove the screw 4 and pull up the driver unit ass'y (L) 2 and (R) 3.

3.At channel L. Remove the screw 5 and insulation washer 6, and pull up the charge print circuit board 7.

4.Remove the switch knob 8.

5.Remove the screw 9 and remove the battery door 10 from the housing ass'y (L) 12.

6.Remove the battery 11 from the housing ass'y (L) 12.

7.At channel R. Remove the main print circuit board 13 from the housing (R) 14

8.Remove the wire with solder from the charge and main print circuit board 7 13, then remove the headband

ass'y 15.

(No.70270) 3

HA-W500RF (EG)/(EK)

g

2.Schematic diagram

ANT1

C75

1

Test-1

L3
12nH

IC1 7201-15

3 1

VI VO

GND

2

C1
3p*

X1 C2

D1

V809

Test-10

JX1
CHARGE OUTPUT
TERMINAL

C39

1000p

C48
1000p

!

X4
863MHz

R30

1k

C8
100p

TC1

1.5-3p

C3
5p6

R24

R2

1K

39k

VR4
5k

!

S1a SW SPDT

R50
330

0.01u

L2

C881000p

15nH

C76

9

0

VR2
100k

C5
1u

C52

0.01u
C51

22P

4

R49
27K

C47

1000p

C59
10u

C17
3P*

C46

0.1u

C20
2P(N)

Q9
5508

100p

R28
1k

R27
1k

VR3
5k

R42
50

R40
1M

C78
1p

R29
100

K

L1
15nH

R1

18k

Q1

50

R4

3P*

47

R25
1k

R26
1k

C80

0.01u

R53
27K

C77
1p

R56
0

C45

0.1u

VR3 795.1Mhz
VR4 791.5Mhz

+

BATTERY

-

!

82K

R46

R41

C73

0.1u

75k

Test-11

R54
330

C874p

C81

0.01U

Q11
5508

2.4V

3
2

+

S1bSW SPDT

C44
10u

!

84

+

-

L9
15nH

C83
10p

*
N750

ON
OFF

R37300

R38

100k

IC4A

LM393 or
NJM2903M

1

R39
68k

C41

C19

1u

0.001u

C84

0.01u

Q8

R35
100k

R36
100k

R18
10

R13

1k5

IC4B

84

LM393 or

5

NJM2903M

+

6

-

7

R47 18k

3904

D2A RED
D2B GREEN

D3 4148 Q68550

C60
47u

X3

10.7M

IC5

78L06

L8

0.33uh

R11
100

GND

2

R434k7

Q7

3904

C53
56P

X2

10.7MHz

31

VIVO

C61
10u

Test-3

R12
330

4148

R4510k

R4410k

C21
12p

C49

10

Test-6

Test-7

C22
12

7p

+

R14

100K

15 29

813 9

C30

0.01U

R16

3k3

11

C31
10U

T2

p

C25

+

+

C24

C23
10U

0.1U

Test-1 High RF in

C72
4U7

2

35

6

+

+

Test-3 Low RF in
Test-5 R out
Test-6 L out
Test-7 GND
Test-8 VCC
Test-9 STEREO
Test-10 VT
TEST-11 REF V

VR1b

100k

C38

C36

100u

+

2U2

R19
2k7

R20
2k7

VR1a

100k

+

C37
2U2

4U7

3020

17

Test-9

1

27

R34
2k2

C32

+

0.47u

R33

+

2

2K

R22
27k

R21
100K

1

7

C33
4U7

OUT1

OUT2

8

BY PASSMUTE

4

Rout

Lout

IC3
LM4809

VCC

IN1

IN2

GND

R32
3K3

C54
2u2

+

+

C55
2u2

C73
220u

(C74)

C32

220u

R23
27k

VR5
5K

+

+

T1

C40
1u

C10
10p

21 4

18

26

722

IC2
CXA1538M

216 28

6233

5

25

+

C27

1U

R31
2K2

R15

3k3

D4

C34

0.015u

+

C26
1U

Test-8

C43

220u

+

+

+

C28

C29

4U7

33U

C35

0.015u

Test-5

C42

0.1u

SPK1
32ohm
Rout

SPK2
32ohm
Lout

Use of Circuit Diagram

Notes:

1. The thick line ( ) is the B (+) power supply.

2. This circuit diagram is the r eference diagram. Cir cuits and constans ar e subject to change without notice for
improvement.

3. Values printed in r ed show the voltares of each section measur ed by the tester (inter nal resistance 20 kOhms/V),
with the power switch ON.

4. Parts marked with (in the shaded area ) are safety parts.When replacing these, be sure to use only the

nated parts to ensure safety.

desi

4 (No.70270)

!