JVC XM-PX5SL Service Manual

SERVICE MANUAL

PORTABL MINIDISC PLAYER

XM-PX5SL

Contents

Safety Precautions Attention when MD pickup is exchanged Important for Laser Products Disassembly method Maintenance of MD pickup Procedures of changing the MD pickup Adjustment method Description of major ICs

This service manual is printed on 100% recycled paper

Areas suffix

B --------------------------------- U.K. E ------------- Continental Europe EN -------------- Northern Europe

1-2 1-3 1-4 1-5 1-9 1-9 1-10 1-11~22

No.20849

Jul. 2000

XM-PX5SL

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.).

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.

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.

1-2

Attention when MD pick up is exchanged

1. About the static electricity protection measures

The laser diode in the traverse unit (optical pick up) is easy to be destroyed by clothes and the human body to the electrified static electricity. Please note the explosion by static electricity when repairing.

2. About the earth processing for the electrostatic destruction prevention

In the equipment which uses an optical pick up (laser diode), an optical pick up is destroyed by the static electricity of the work environment. Please do the earth processing and work.

1) Earth of work stand Please pull the conductive material (conductive sheet) or the iron plate to the depository place of the traverse unit (optical pick up), and take the earth to ground.

2) Human body earth Please use the anti-static wrist strap to exhaust the electrified static electricity to the human body.

anti-static wrist strap

XM-PX5SL

Conductive material (conductive sheet) or the iron plate

3. Handling the optical pick up

1) Please return according to a correct procedure based on short processing after exchanging parts.

2) Do not use a tester to check the condition of the laser diode in the optical pick up .The tester 's internal power source can easily destroy the laser diode.

4. Attention when unit is disassembled

Please refer to "Disassembling method" for how to detach .

1) Please be sure to solder before a flexible wire is removed from connector CN301 on a main printed circuit board as shown in Figure 2. if you removes without soldering.the MD picking up assembly might destroy

2) When installing , solder in the part of short round should be removed after a flexible wire is connected with CN301

solders.

CN301

Fig 1

Fig 2

1-3

XM-PX5SL

Important for Laser Products

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the

Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible

laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. It is dangerous to defeat the safety switches.

VARNING : Osynlig laserstrålning är denna del är öppnad

och spårren är urkopplad. Betrakta ej strålen.

VARO : Avattaessa ja suojalukitus ohitettaessa olet

alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of

procedures other than those specified herein may result in hazardous radiation exposure.

CAUTION

!

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

ADVARSEL : Usynlig laserstråling ved åbning , når

sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling.

ADVARSEL : Usynlig laserstråling ved åpning,når

sikkerhetsbryteren er avslott. unngå utsettelse for stråling.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

DANGER : Invisibie laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e)

VARNING : Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen. (s)



VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen. (d)

ADVARSEL :Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. (f)

1-4



XM-PX5SL

Disassembly method

Removing the MD door ass’y

(See Fig.1 and 2)

1.

Open the door by moving the eject knob.

2.

Remove the four screws A attaching the MD door assy. Detach the MD door ass'y from the main body.

Removing the holder ass’y

(See Fig.3 and 4)

1.

Turn the holder ass’y as shown in Fig.3.

2.

Pull the side arm (L) marked a outward, then remove. Open the holder ass’y as shown in Fig.4.

3.

Move the U-shaped notch marked b in the direction of the arrow and release it from the shaft.

4.

Move the part c inward and pull out the holder ass’y from the shaft.

A

MD door ass'y

Eject knob

MD door ass’y

Fig.1

Fig.2

Eject knob

A

ATTENTION:

U-shaped notch

When reassembling, first reattach the part c to the shaft of the chassis ass’y. And next, fit the U-shaped notch to the shaft.

b

Holder ass'y

a

Fig.3

Shaft

Fig.4

c

1-5

XM-PX5SL

Removing the chassis ass’y (See Fig.5 and 6)

1.

Remove the two screws B and the one screw C attaching the chassis assy. Remove the one screw D attaching the jack cover.

2.

Open the battery lid and release the tab d from the battery contact. Pull out the battery lid.

3.

Remove the one screw E attaching the arm (L).

4.

Remove the chassis ass’y and the arm (L) while releasing them from the headphone jack on the bottom case.

Removing the main P.W. board and the battery holder(See Fig.7 and 8)

1.

Use a soldering bit provided with ground to solder or unsolder the short round.

2.

Ground the set and the P.W.board. The voltage level of the ground should be equal to that of the soldering bit.

Bottom case

Battery lid

C

B

Chassis ass'y

D

Fig.5

Headphone jack

Jack cover

B

3.

Prevent static electricity using an earth band, etc.

4.

Solder the short round of the pickup FRC for short circuit.

5.

Disconnect the flexible wires from the connector CN301 and CN801 on the main P.W.Board.

6.

Remove the one screw F attaching the main P.W.board. Remove the main P.W.board and the battery holder, then reverse them.

7.

Disconnect the flexible wire from connector CN601 on the main P.W.board.

8.

Unsolder the soldered joint of the main P.W.board and the battery holder P.W.board.

Battery holder

MD mechanism ass'y

d

Battery holder

Arm (L)

E

Fig.6

Soldering

F

1-6

CN601

Main P.W.board

CN401

Pickup short round

CN301

Main P.W.board

Fig.7Fig.8

XM-PX5SL

Removing the spindle motor(See Fig.9)

1.

Unsolder the part d of the flexible wire extending from the underside of the chassis ass’y to the spindle motor. At this time, do not spill flux on the gear and others.

2.

Remove the three screws F attaching the spindle motor and detach it from the chassis ass’y.

Removing the pickup unit(See Fig.9)

1.

Remove the slit washer and the worm gear from the underside of the chassis ass’y.

2. Remove the screw G attaching the shaft holder, then detach the shaft.

3.

Pull out the part f and g in the directions of the arrows to remove the pickup unit and the lead screw.

Worm gear

Lead screw

Slit washer

g

G

Pickup unit

Shaft holder

d

f

Fig.9

F

Spindle motor

Removing the pickup(See Fig.10 and 11)

1.

Remove the screw H attaching the lead spring, then detach the lead spring.

2.

Pull out the shaft from the pickup.

ATTENTION:

When handling the pickup unit, touch the parts marked in Fig.11 only.

Lead screw

H

Lead spring

Pickup

Fig.10

Touch these parts only.

Fig.11

1-7

XM-PX5SL

Removing the feed motor(See Fig.12)

1.

Peel off the part h of the flexible wire on the underside of the feed motor.

2.

Unsolder the solder joint j connecting the flexible wire to the feed motor.

3.

Peel off the part i of the flexible wire.

4.

Remove the two screws I attaching the feed motor on the upper side of the chassis ass’y.

ATTENTION:

When reassembling, reattach the flexible wire with an adhesive tape and solder the appropriate part.

Removing the SW P.W.B ass’y

(See Fig.13)

Feed motor

Chassis

i

I

j

h

Fig.12

1.

Remove the SW P.W.B ass’y attached to the side of the chassis ass’y with the double-sided tape.

2.

When reassembling, reattach the SW P.W.B ass’y with an adhesive tape as before.

SW P.W.B ass'y

Fig.13

1-8

XM-PX5SL

Maintenance of MD pickup

1. Cleaning of pickup lens

(1) Prior to changing the pickup, clean the pickup lens.

(2) For cleaning the lens, use the following cotton swab after mearsing it in alcohol.

Product No. JCB-B4; Manufacturer;Nippon Cotton Swab

2. Confirmation of the service life of laser diode when the service life of the laser diode has been exhausted, the following symptoms will appear.

(1) The RF output (EFM output and eye pattern amplitude) will become lower.

(2) The drive current required for light emitting of laser diode will be increased.

Confirm the service life according to the following flow chart:

Procedures of changing the MD pickup

Change the MD pickup by referring

to "Removing the MD pickup" in the

Disassembly method.

Set the pickup to [TEST] mode according

to the procedures described in the

Adjustment method.

Adjust the laser power 560 W.

Power supply voltage 1.5V 20mV Adjustment

Adjust the disc.

Can the laser power

adjust under test mode?

YES

Is the drive current

of laser diode

55mA or less?

YES

OK.

NO

Change the pickup

NO

Change the pickup

3. Method of measuring the drive current of

laser diode

When the voltage measured at the both side of carbon resistor R301 on the MD servo P.C. board (LVB20008) have become

12.1mV or over, the service life of the laser diode is judged to have

been exhausted.

Completion of changing the MD pickup.

Be sure to perform not only adjustment and operation of this system so carefully as not to directly look at the laser beam or touch on the body.

4. About Semi-solid state resistor of pick up

This is adjusted in the maker of pick up . Be careful please not to touch pick up .

1-9

XM-PX5SL

Adjustment method

Test mode setting method

Press < PLAY MODE + DISPLAY + BASS > and < PLAY >key together more than 3sec. at power off condition. < VOL > next item .< VOL+ >before item.

LCD indication

0. TMD-V2

5. M o T G

7.

Test mode setting OK. Indicate at 2sec. When LCD indicate [NG] at another item, Return back this item by press (STOP) key

Resume initialize LCD Indication change :

* Initializing

*

Resume

Initializing

Servo

LCD Indication change :[FwdBwd]

< VOL-> :Pickup is go to inside

LCD Indication change :[OK ]

*

Adjusting

]

*

Adjusting

XXYYZZ

Adjusting

*

Servo initialize LCD Indication change : [ ]

PLAY LASER Executes by < BASS > LCD Indication change :[XX:YY]

Up by < VOL+> .Down by <VOL > LCD Indication change :[VW.YY]

Setting by <STOP> LCD Indication change :[ OK ]

Laser power adjust 560 adjust

Adjust power-supply voltage 1.5v 20mv before the laser power is adjusted and stops.

FEED Executes by < BASS >

<VOL+> :Pickup is go to outside

Press < STOP >

MO TG Executes by < BASS > LCD Indication change : [ ]

MO DISC ADJUST Executes by < BASS > LCD Indication change : [ ]

Press < STOP >

LCD Indication change : [OK

Pre TG

Executes by < BASS >

LCD Indication change : [ ]

Pre DISC ADJUST Executes by < BASS >

LCD Indication change : [

Press < STOP > RESET

Executes by < BASS >

LCD Indication :

Left out the test mode ,power off ,and END.

PLAY LASER

*

Adjusting

MO DISC ADJUST

]

FEED

1-10

Description of major ICs

CXD2661GA-1 (IC351) : DSP

1.Pin Layout

22

21

23

24

26

25

CXD2661GA-1 TOP VIEW

82

85

86

83

87

84

39

41

43

44

49

52

54 55

58

61

62 63

65 66

69

71

143

35

147

38

40

144

42 37

46

45

47

48

50

51

53

56

57

60 59

64

68

67

146

70

72

145

33

34

36

73

74

75

30

31

32

76

77

79

29

27

28

78

80

81

20

88

89

90

17

19

18

92

91

93

14

16

15

96

94

95

13

12

97

98

99

XM-PX5SL

7

8

9

10

11

100

102

101

5

4

6

1

140

136

134 135 137

131 132

128 129

125

122 123 124

119

115 117 118

113 114

108

103

104

106

105

107

23

142

141

139

138

133

130

126

127

121

120

116

111 112

110109

2.Function

Symbol

no.

1

VDCO

2

MNT0

3

MNT1

4

MNT2

5

MNT3

6

SWDT

7

SCLK

8

XLAT

9

VSCO

10

SRDT

11

SENS

12

XRST

13

SQSY

14

MTFLGL

15

TST1

16

XINT

17

TST2

18

VDIOSC

19

OSCI

20

OSCO

21

VSIOSC

22

DAVSSL

23

VREFL

24

AOUTL

25

DAVDDL

26

DAVDDR

27

AOUTR

28

VREFR

29

DAVSSR

30

VSC1

31

TST9

32

TST3

33

TST4

34

DOUT

35

NC

I/O

-

VDD for internal logic (1.8V)

I/O

Monitor input/output

O

Monitor output

O

Monitor output

O

Monitor output

I

Microcomputer serial bus data writing input

I

Microcomputer serial bus clock input

I

Microcomputer serial bus latch input

-

GND for internal logic (1.8V)

O

Microcomputer serial bus data reading output

O

An internal state output to the address of the microcomputer seriall bus.

I

Resets input "L"=reset

O

PTGR=0 : ADIP sync output,PTGR=1 : DISC SUB-Q sync output

O

Lch 0 data detection flag output

I

Test terminal "L"

O

Interrupt status output

I

Test terminal "L"

-

Vdd for OSC cell (2.4V)

I

X 'tal oscillation circuit input

O

X 'tal oscillation circuit output

-

GND for OSC cell

-

Build in DAC GND (Lch)

O

Built-in DAC VREF (Lch)

O

Built-in DAC Lch output

-

Built-in DAC VDD (Lch 2.4V)

-

Built-in DAC VDD (Lch 2.4V)

O

Built-in DAC Rch output

O

Built-in DAC VREF (Rch)

-

Built-inDAC GND (Rch)

-

GND for internal logic

I

Test terminal "H"

I

Test terminal "L"

I

Test terminal "L"

O

Digital audio output

-

OPEN

Function

1-11

XM-PX5SL

2.Function(2)

Pin NO.

36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98

99 100 101 102 103 104 105 106 107

Symbol

VDC1 VDC2 DATA 1 TST5 TST6 TST7 DADT LRCK VSC2 XBCK F256 A03 A04 A02 A05 A01 A06 VDIO1 VSIO1 A00 A07 A10 A08 A09 XRAS IXOE IXWE XCAS D1 D2 D0 D3 VDC3 VSC3 A11 XOE XWE MVCI ASYO ASYI AVD1 BIAS RFI AVS1 PCO FILI FILO CLTV PEAK BOTM ABCD FE AUX1 VC ADIO ADRT AVD2 AVS2 ADRB SE TE DCHG APC ADFG VDIO2 VSIO2 F0CONT XLRF CKRF DTRF APCREF LDDR

I/O

-

VDD for internal logic. (1.8V)

-

VDD for internal logic. (1.8V)

I

External audio data input terminal to internal DAC

I

Test terminal "L"

I

Test terminal "L"

I

Test terminal "L"

O

Data output to external D/A converter

O

LR clock for external D/A converter (44.1kHz)

-

GND for internal logic. (1.8V)

O

Bit clock for external D/A converter (2.8224MHz)

O

11.2896MHz clock output (X'tal)

O