JVC RCEZ-31-A Service manual
SERVICE MANUAL
CD PORTABLE SYSTEM
RC-EZ31A
Area Suffix
US ----- Asia
UX ----- Middle East
A ----- Australia
SERVICE POLICY
No service part is available for this model.
Based on One to One exchange policy.
Contents
Safety precaution ............................................................................2
Preventing static electricity .............................................................3
Disassembly procedure...................................................................4
Flow of function operation until TOC read ......................................5
Voltage charts .................................................................................6
Block diagram .................................................................................8
Wiring connection ...........................................................................9
Schematic diagrams...................................................................... 11
Illustration of packing and parts list...............................................18
COPYRIGHT © 2006 JVC ASIA PTE LTD
No: 28225
JAN. 2006
RC-EZ31
CAUTION
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 ti the original design unless
authorised in writing by the manufacturer. Replacement parts must be identical to those used in the
original circuits. Services should be performed by qualified personel 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 eletrical 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 obtain by using replaement components rated for higher voltage, the Parts
List of Service manual. Electrical components having such features ate identified by the shading on the
schematics and by (
repalcement 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, tubing's, barriers and the like to
be separated from live parts, high temperatures parts, moving parts and/or sharp edges for the
prevention of electric shcok and fire hazard. When service is required, the original leat routing and
dress should be observed, and it should be confirmed that they have been returned to normal, after
re-assembling.
!
) on the parts List in the Service Manual. The use of a substitute
XL-SV320SL/SV305GD
XL-SV308BU
5. Leakage current check (Electrical Shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metap 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 isloation 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 ecposed metal parts of the cabinet, particularly and 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 sensitvity in the following manner. Connect a 1,500 ohm 10W resistor paralleled by a
0.15uF 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 and exposed metal part
having a return path to te chassis and
measure 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.).
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. It mains voltage selector is provided, check setting for local voltage.
Warning
Burrs formed during moulding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of performing repair of this system.
2
RC-EZ31
Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,
can destroy the laser diode in the traverse unit (optical pcikup). Take care to prevent this when performing repairs.
1.1. Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devicessuch as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.
1.1.1. Gound the workbench
1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over
it before placing the traverse unit (optical pickup) on it.
1.1.2. Ground yourself
1. Use an anti-static wrist starp to release and static electricity built up in your body.
1.1.3. Handling the optical pcikup
1. In order to maintain quality during transport and before installation, both sides of the laser diode on the
replacement optical pickup are storted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
2. Do not use a tester to check the condition of the laserdiode in the optical pickup. The tester's internal power
source can easily destory the laser diode.
1.2. Handling the traverse unit (optical pickup)
1. Do not subject the traverse unit (optical pcikup) to strong shocks, as it is a sensitive, complex unit.
2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific
details, refer to the replacement procdeure in the text. Remove the anti-static pin when replacing the traverse
unit. Be careful not to take too long a time when attaching itto the connector.
3. Handle the flexible cable carefully as it may break when subjected to strong force.
4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not return it.
3
RC-EZ31
Disassembly Procedure
Remove the back cabinet
1. Open battery cover and remove
3 screws on the bottom cabinet. (Screw A)
2. Remove 5 screws on back
(Screw B)
XL-SV320SL/SV305GD
XL-SV308BU
Screw A
Screw B
Remove the top panel
1. Remove 3 screws to take Screw C
out the top panel with the
board. (Screw C)
Then the unit is disassembled
4
Flow of functional operation until TOC read
Power Key
Slider turns REST
SW ON.
Automatic tuning
of TE offset
RC-EZ31
Check Point
Check that the voltage at the pin
63 of IC902 is OV (a moment)?
Laser ON
Check that the voltage at the
pin1 of IC902 + side is + 5V?
Detection of disc
Automatic tuning of
Focus offset
Confirm that the Focus error
Tracking error waveform at TOC reading s-cuve signal at the pin16 of
pin 14 of
IC902(TE)
Approx
1.8V
Approx 3sec
Automatic measurement of
focus A-curve amplitude
Disc is rotated
IC902 is approx.2V p-p
Confirm that the signal from
pin14 IC902 is 0V as a
VREF
Tracking
servo
off status
Disc status
to rotate
Tracking
servo
on
statues
Disc to be
braked to
stop
TOC reading
finishes
Focus servo ON
(Tracking servo ON)
Automatic measurement of
Tracking error amplitude
Automatic tuning of
Tracking error balance
accelerated pulse during
approx.400ms
Confirm the waveform of
the Tracking error signal
at the pin14 of IC902
(See fig-1)
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance
500mV/div
2mS/div Fig.1
Automatic tuning of
Focus error balance
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
5
Confirm the eys-pattern
at the lead of TP1
RC-EZ31
V
)
V
)
V
)
V
)
V
)
V
)
V
)
V
)
V
)
V
)
V
)
V
)
V
)
V
)
V
)
Voltage Charts
IC No.
pin NO:
otage(v
pin NO:
otage(v
pin NO:
otage(v
pin NO:
otage(v
1234567891011121314151617181920
0.10 2.47 1.71 0.02 1.52 4.95 2.22 0.02 2.50 2.26 0.02 2.67 0.05 0.05 11.31 0.02 4.94 2.51 2.51 0.02
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
4.93 4.95 4.91 0.02 0.02 0.02 0.02 2.92 2.47 2.48 2.48 2.48 2.48 2.48 2.48 4.12 4.12 4.12 0.02 4.95
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
4.93 4.93 4.93 4.93 0.10 0.07 4.91 4.94 4.95 0.02 4.94 4.32 4.93 1.98 3.96 0.00 1.98 0.02 0.02 2.12
61
62 63 64
2.19 4.95 4.95 4.85
XL-SV320SL/SV305GD
XL-SV308BU
IC902 LC78601RE CD PLAY
IC No.
pin NO:
otage(v
pin NO:
otage(v
pin NO:
otage(v
pin NO:
otage(v
IC No.
Item
DC12V 3.55 3.13 2.15 2.15 6.60 5.18 2.18 0.10 2.19 2.19 3.65 3.15 0.10 6.85 0.90 0.90 3.50 3.30 2.20 2.20
Item
DC12V 7.34 7.34 2.20 2.20 2.20 3.40 3.40 0.10
IC No.
pin NO:
otage(v
pin NO:
otage(v
IC No.
pin NO:
otage(v
pin NO:
otage(v
1234567891011121314151617181920
2.56 2.56 2.54 2.54 2.49 2.52 2.52 2.52 2.53 2.52 2.52 2.53 2.45 2.53 2.60 2.56 2.53 2.51 2.53 2.52
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
2.52 0.02 2.48 2.48 2.48 2.53 2.77 2.52 2.54 2.20 2.18 2.51 2.51 4.49 0.02 1.40 0.07 4.93 2.36 2.67
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
2.33 2.45 2.27 2.50 0.02 2.52 2.53 0.00 0.08 2.47 4.91 4.94 0.02 4.85 0.02 4.94 2.52 2.53 2.39 2.41
61 62 63 64
2.23 3.79 0.22 4.94
1234567891011121314151617181920
21 22 23 24 25 26 27 28
1234567891011121314151617181920
0.85 0.00 0.31 5.44 0.51 5.63 5.10 5.63 0.00 0.00 0.67 4.86 1.08 1.08 5.63 4.68 0.70 1.62 0.55 5.63
21 22 23 24
5.63 5.63 5.63 5.63
1234567891011121314151617181920
0.00 0.00 1.04 5.61 0.12 5.64 4.98 5.64 0.00 0.61 0.64 5.07 1.08 1.08 5.64 5.64 0.70 1.13 1.03 5.64
21 22 23 24
5.67 5.64 5.64 5.64
IC901 LA9242M CD PLAY
IC902 MM1469 CD PLAY
IC101 SA2111 TUNER FM
IC101 SA2111 TUNER AM
IC No.
pin NO:
otage(v
IC No.
pin NO:
otage(v
IC No.
pin NO:
otage(v
12345678910111213141516
0.00 0.00 0.00 0.53 0.00 0.00 0.00 0.00 0.00 0.00 0.49 0.00 0.00 0.00 0.00 5.85
12345678910111213141516
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.98 0.00 0.00 0.00 0.00 0.00 0.00 5.82
12345678910111213141516
0.00 0.00 0.00 0.20 0.00 0.00 0.00 0.00 0.00 3.95 0.20 0.00 0.00 0.00 0.00 5.66
IC501 TC-4052 TUNER
IC501 TC-4052 CASS PLAY
IC501 TC-4052 CD PLAY
6
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