JVC HA-W500RF EK User manual

SERVICE MANUAL
CORDLESS FM STEREO HEADPHONES
No.70270
Sep. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
HA-W500RF (EG)/(EK)
HA-W500RF (EG)/(EK)
Specifications
* Design and specifications subject to change without notice.
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)
Mass
: 115 (4.1 oz)
(Without connection cord and AC
adaptor)
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. standar d
stereo phone plug)
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)
Contents
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 (9.9 oz)
(With installed rechargeable
Ni-Cd batter y x 2)
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

HA-W500RF (EG)/(EK)
2 (No.70270)
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.
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

HA-W500RF (EG)/(EK)
(No.70270) 3
R
L
R
3
1
7
8
6
5
2
12
10
1
4
9
4
11
4
414
13
15
R
1.Disassembly
Receiver(Headphones)
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.
1.Remove the ear pad 1from the driver unit ass'y (L) 2and (R) 3.
2.Remove the screw 4and pull up the driver unit ass'y (L) 2and (R) 3.
3.At channel L. Remove the screw 5and insulation washer 6, and pull up the charge print circuit board 7.
4.Remove the switch knob 8.
5.Remove the screw 9and 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.

HA-W500RF (EG)/(EK)
4 (No.70270)
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 red show the voltares of each section measured 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
desi
g
nated
p
arts to ensure safet
y
.
Use of Circuit Diagram
*
N750
Test-1 High RF in
Test-3 Low RF in
Test-8 VCC
Test-7 GND
Test-5 R out
Test-6 L out
VR3 795.1Mhz
VR4 791.5Mhz
OFF
ON
JX1
CHARGE OUTPUT
TERMINAL
Rout
Lout
Test-9 STEREO
216 28
11
6
23
3
3020
5
17
1
21 4
15 29
18
25
IC2
CXA1538M
10
27
26
813 9
722
Rout
Lout
(C74)
Test-10 VT
TEST-11 REF V
X3
10.7M
C47
1000p
+
C72
4U7
1k5
R13
D4
4148
C8
100p
D2B GREEN
C40
1u
R12
330
C49
7p
C41
1u
+
C254U7
+
C43
220 u
C42
0.1u
+
-
IC4B
5
67
84
C73
0.1u
L3
12nH
R37300
C45
0.1u
+
C27
1U
TC1
1.5-3p
VR4
5k
1k
R25
1k
R26
C48
1000p
R40
1M
D3 4148 Q6 8550
Q7
3904
R41
75k
Q8
3904
+
C38
100u
27k
R22
27k
R23
C22
12p
C75
0.01u
2k7
R19
VR2
100k
+
-
IC4A
LM393 or
NJM2903M
LM393 or
NJM2903M
3
21
84
2k7
R20
S1a SW SPDT
R42
50K
S1bSW SPDT
+
C73
220u
R14
100K
+
C32
220u
VR1b
100k
VR1a
100k
C76
100p L9
15nH
+
C36
2U2
+
C37
2U2
T2
R31
2K2
+
C44
10u
C77
1p
C78
1p
C83
10p
L1
15nH
C881000p
+
C28
4U7
+
C26
1U
+
C29
33U
+
C31
10U
IC1 7201-15
3 1
2
VI VO
GND
Q9
5508
R56
0
Q1
5094
R49
27K
+
C32
0.47u
R50
330
R53
27K
C30
0.01U
C81
0.01U
Q11
5508
R54
330
+
C23
10U
C24
0.1U
+
C54
2u2
+
C55
2u2
IC5
78L06
31
2
VIVO
GND
R34
2k2
+
C33
4U7
C10
10p
C59
10u
1K
R24
C61
10u
C60
47u
SPK1
32ohm
SPK2
32ohm
C84
0.01u
R30
1k
C17
3P*
C20
2P(N)
R47 18k
ANT1
1
VR5
5K
R33
2K2
R32
3K3
C39
1000p
IC3
LM4809
2
7
1
35
4
6
8
IN1
OUT2
OUT1
BY PASSMUTE
GND
IN2
VCC
VR3
5k
R35
100k
R36
100k
R38
100k
R434k7
R39
68k
C19
0.001u
R4410k
1k
R27
R4510k
1k
R28
C1
3p*
C3
5p6
L8
0.33uh
C53
56P
X1 C2
3P*
R2
39k
R4
470
100
R29
C5
1u
R1
18k
D1
V809
C46
0.1u
R11
100
T1
C874p
X2
10.7MHz
R15
3k3
R16
3k3
C34
0.015u C35
0.015u
D2A RED
C51
22P
C52
0.01u
10
R18
C21
12p
100K
R21
R46 82K
X4
863MHz
L2
15nH
C80
0.01u
BATTERY
2.4V
Test-3
Test-1
Test-8
Test-9
Test-5
Test-6
Test-7
Test-10
Test-11
!
!
!
!
!
2.Schematic diagram
+
-

HA-W500RF (EG)/(EK)
(No.70270) 5
4.Print Circuit Board
Back side
Receiver (Headphones)
CHARGE P. C. BOARD
TOP
3.Measurement Condition
AC IN
Transmitter Receiver (Headphones)
Distance : 1m (3.28ft)
Reference input signal :1kHz 300mVp-p sine wave
Hedaphone volume control : MAX
Surface
shows the B(+) power supply
shows the ground
shows others.

HA-W500RF (EG)/(EK)
6 (No.70270)
4.Print Circuit Board
Surface
Back side
shows the B(+) power supply
shows the ground
shows others.
Receiver (Headphones)
MAIN P.C.BOARD
TOP
A
1234
B
C
D
Receiver (Headphones)
MAIN P.C.B. LOCATION
Symbol
IC2
IC3
IC4
IC5
Q6
Q7
Q8
X2
X3
D2
D3
D4
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
Location
2B
2A
CHG.PCB
CHG.PCB
CHG.PCB
CHG.PCB
CHG.PCB
3C
2B
CHG.PCB
CHG.PCB
CHG.PCB
Symbol
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
Location
1B
CHG.PCB
2B
3B
3B
CHG.PCB
2A
2A
2A
3A
2A
3D
4C
4C
4C
4C
3D
3C
2B
2B
2B
CHG.PCB
CHG.PCB
Symbol
R37
R38
R39
R40
R41
R42
R43
R44
R45
R46
R47
R48
R49
R50
VR1
VR2
VR3
VR4
VR5
JP1
JP2
JP3
JP4
C21
C22
Location
CHG.PCB
CHG.PCB
CHG.PCB
CHG.PCB
CHG.PCB
CHG.PCB
CHG.PCB
CHG.PCB
CHG.PCB
CHG.PCB
CHG.PCB
3A
4B
4C
4C
1B
1C
3D
3D
1B
2C
Symbol
C23
C24
C25
C26
C27
C28
C29
C30
C31
C32
C33
C34
C35
C36
C37
C38
C39
C40
C41
C42
C43
C44
C45
C46
C47
C48
Location
1C
1C
1B
3B
3B
2B
3B
3C
1B
2B
3B
3B
3B
3A
3A
2A
3D
2D
2D
4D
4C
3C
4B
3D
Symbol
C49
C50
C51
C52
C53
C54
C55
C59
C60
C61
C72
C73
C74
T1
T2
L8
Location
2B
2C
3B
3A
CHG.PCB
CHG.PCB
CHG.PCB
2A
3A
2A
1B
2C
2C
ICs
Transistors
Filters
Diodes
Resistors
Resistors Resistors
Capacitors
Capacitors Capacitors
Coils

HA-W500RF (EG)/(EK)
(No.70270) 7
RX:IC3
LM4809
1
2
3
45
6
7
8
Output 1
Input 1
Bypass
GND
Vcc
Output 2
Input 2
Shutdown
RX:IC4
NJM2903M
LM393
1
2
3
45
6
7
8
Output 1
-Input 1
+Input 1
GND
Vcc
Output 2
-Input 2
+Input 2
RX:IC2
CXA1538M
5.Wiring Diagram
6.Block View Inside IC
Ni-Cd
Battery
Black lead
Red lead
Speaker
(Lch)
Red lead
Blue lead
Black
lead
Inside of the
head band
ass'y
Inside of the housing (R)
Antenna
Inside of the
head band ass'y
Natural shielded lead
Green shielded lead
Green
shielded lead
Red shielded lead
Natural shielded lead
Natural shielded lead
Speaker
(Rch)
Inside of the housing (L)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
PLL LPF1
PILOT DET LPF2
PILOT DET LPF2
ST IND/VCO CHECK
Rch OUT
Lch OUT
Vcc
RIPPLE FILTER
AGC AFC 1
AGC AFC 2
GND
TUNE IND
FM IF IN
AM IF IN
BAND SELECT
GND
PLL LPF2
MPX REG
VCO
FM DISCRI
MUTE
AM OSC
AFC
FM OSC
REG
FM RF
AM RF IN
FM RF IN
FE GND
FM/AM FE OUT

HA-W500RF (EG)/(EK)
8 (No.70270)
7.Block Diagram
8.Electric Parts List
AItem No. Parts No. Parts Name Description
J22121-001 Transmitter Unit
AItem No. Parts No. Parts Name Description
AJ22133-001 Main P.C.B Ass'y Adjusted
J22134-001 Charge P.C.B Ass'y
D2 J47138-001 LED Power and charge Indicator
VR1 J47139-001 Variable Resistor Volume control, 100 k X 2
VR2 J47140-001 Variable Resistor Tuning control, 100 k X 1
ASW1 J47145-001 Power Switch Slide
AJK1 J47141-001 Charge Jack
In case of some problem arise in this transmitter unit, have to change the transmitter unit
itself, due to avoid the law of radio regulation.
Parts marked (A) ave safety parts. When replacing, be sure to use the specified one.
Parts marked (A) are safety parts. When replacing, be sure to use the specified one.
Receiver (Headphones)
Transmitter
Receiver (Headphones)
ANT
FILTER
UHF
MODULE
ANT IF
VB
VT
18 FM STEREO RADIO
IC2:CXA1538M
RF IN
OSC RF
Rch
AF OUT
Lch
AF OUT
DISCRIFE OUTIF INVcc
26
16
13
HEADPHONE
AMP
IC3:LM4809
1
7
Rch OUT
Lch OUT
4
22 20
TUNING
VR2
8
2
6
POWER INDICATOR
LED RED
Ni-Cd Battery
(1.2V) x 2
POWER
SW1
CHARGE INDICATOR
LED GREEN
COMPARATOR
IC4:LM393
NJM2903
CHARGE INPUT
ON
OFF
ON
OFF
-
5
6
7
A
VOLUME
VR1

HA-W500RF (EG)/(EK)
(No.70270) 9
R
L
R
6
8
711
5
2
4
8
10
11
10
9
10
10 3
1
Charge P.C.B. Ass'y
Main P.C.B. Ass'y
R
9.Exploded View
Receiver(Headphones)
AItem No. Parts No. Parts Name Q'ty Description
1 J34073-001 Headband Ass'y 1 with connecting wir e
2 J34074-001 Housing(L) Ass'y 1 with battery terminal
3 J34075-001 Housing(R) Ass'y 1
4 J34076-001 Battery Door 1
with protector
5 J34077-001 Driver Unit(L) Ass'y 1
with protector
6 J34078-001 Driver Unit(R) Ass'y 1
7 J47146-001 Swihch knob 1
8 J47144-001 Ear Pad 2
9 J46514-001
Rechargeable Ni-Cd batteries 1
10 QYSPSPU1411M Screw 8
11 QYSPSFT1403M Screw 4
Receiver(Headphones)
10.Mechanical Parts List
Parts marked ( A) are safet
y
parts. When replacin
g
, be sur e to use the specifide one.
2pcs/pack

HA-W500RF (EG)/(EK)
10 (No.70270)
1
89
5
3
6
7
10
12
11
2
4
AItem No. Parts No. Parts Name Q'ty Description
1 J22110-001 Packing case 1 for (EG) model
1 J22110-002 Packing case 1 for (EK) model
2 J22135-001 Packing Holder 1
3 J47142-001 Sub Packing Holder 1
4 QPA01202005 Poly Bag 1 for transmitter
5 QPA01506005 Poly Bag 1 for receiver(headphones)
6 QPA00500805 Poly Bag 1 for connection cord
7 QPA01202005 Poly Bag 1 for AC Adaptor
12.Packing Materials Parts List
AItem No. Parts No. Parts Name Q'ty Description
A8 J5500-114A Instructions 1 for (EG) model
A8 J5500-115A Instructions 1 for (EK) model
9 BT-54008-4
European Guarantee Certificate 1
A10 J47126-001 AC Adaptor 1 for (EG) model
A10 J47127-001 AC Adaptor 1 for (EK) model
11 J47143-001 Connection cord 1
12 J46517-001 Plug adaptor 1
13.Accessories List
Parts marked ( A) are safety parts. When replacing, be sur e to use the specifide one.
11.Packing Method
Parts marked ( A) are safety parts. When replacing, be sur e to use the specifide one.

HA-W500RF (EG)/(EK)
(No.70270) 11
< MEMO >

No.70270
HA-W500RF (EG)/(EK)
Printed in Japan
200209
VICTOR COMPANY OF JAPAN, LIMITED
COMMUNICATION NETWORK BUSINESS UNIT
AV & MULTIMEDIA COMPANY 1644, Shimotsuruma, Yamato, Kanagawa 242-8514, Japan