JVC XMP-55, XMPJ-1 Service manual

SERVICE MANUAL

PORTABLE MINIDISC PLAYER

XM-P55 XM-PJ1

Contents

B E EE EN J UB US UT UX UY

OPEN

XM-P55

Area Suffix

(XM-P55 )

U.K. (BU,SL) Continental Europe (BU,SL) Russian Federation (BU,SL) Northern Europe (BU,SL) U.S.A. (SL) Hong kong (BU,GN,SL) Singapore (BU,SL) Taiwan (SL) Saudi Arabia (SL) Argentina (SL)

B E EE EN J UB US UT UX UY

XM-PJ1

Area Suffix

(XM-PJ1 )

U.K. (BU) Continental Europe (BU) Russian Federation (BU) Northern Europe (BU) U.S.A. (BU) Hong kong (BU,GD) Singapore (BU) Taiwan (BU) Saudi Arabia (BU) Argentina (BU)

Safety Precautions Instructions (For XM-P55&PJ1) Description of Major ICs Removal of Main Parts Maintenance of MD Pickup Procedures of Changing the MD Pickup Self-diagnosis Function of MD

1-2 1-3~16 2-1 2-12 2-23 2-23 2-24

Block Diagrams Standard Schematic Diagrams (XM-P55) Standard Schematic Diagrams (XM-PJ1) Printed Circuit Boards Parts List (XM-P55) Parts List (XM-PJ1)

2-27 2-29 2-36 2-42,43 3-1~15 4-1~15

No.20738

Jan. 1999

XM-P55 XM-PJ1

Safety Precaution

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.

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

1-2 4-15

Description of Major ICs

CXA2523AR(IC310):MD RF & Servo

1.Block Diagram

BOTM

ABCD34FE33AUX32ADFG31ADAGC30ADIN29ADFM28SE27CSLED26TE25WBLADJ

36 35

XM-P55

XM-PJ1

PEAK

39RFAGC

40AGCI

41COMPO

42COMPP

43ADDC

44OPO

45OPN

46RFO

47MORFI

MORFO

2.Pin Function

AGC, EQ

Comp

USER

OP Amp

RF Amp

1 2

ADIP Amp TE/SE Amp

MUX FE Amp

Peak, Bottom Detector

ABCD Amp

3T Detector

I-V Amp APC

3VC4A5B6C7D8E9F10PD11

CPU

Command I/F

TEMP Amp

APC

APCREF

Vcc

3TADJ

22 EQADJ

21 VREF

20 F0CNT

19 XSTBY

18 XLAT

17 SCLK

16 SWDT

15 TEMP R

14 TEMP I

13 GND

Pin No.

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20

Symbol

A B C D E F

APC

APCREF

GND

TEMPI

TEMP R

SWDT

SCLK XLAT

XSTBY

F0CNT

I/O

I-V converted RF signal I input.

I-V converted RF signal J input.

Vcc/2 voltage output.

A current input for main beam servo signal.

B current input for main beam servo signal.

C current input for main beam servo signal.

D current input for main beam servo signal.

E current input for side beam servo signal.

F current input for side beam servo signal.

Reflection light quantity monitor signal input.

Laser APC output.

Reference voltage input for the laser power intensity setting.

Connect to GND.

Connects the temperature sensor.

Connects the temperature sensor. outputs the reference voltage.

Data input for microcomputer serial interface.

Shift clock input for microcomputer serial interface.

Latch signal input for microcomputer serial interface.Latched when low.

Standby setting pin. Normal operation when high Standby when low.

Internal current source setting pin.

Function

2-1

XM-P55 XM-PJ1

Pin No.

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

Symbol

VREF

EQADJ

3TADJ

Vcc

WBLADJ

CSLED

ADFM

ADIN

ADAGC

ADFG

AUX

FE ABCD BOTM

PEAK

RFAGC

AGCI COMPO COMPP

ADDC

OPO OPN RFO

MORFI

MORFO

I/O

Reference voltage output.

Equalizer center frequency setting pin.

I/O

BPF3T center frequency setting pin.

I/O

Power supply.

BPF22 center frequency setting pin.

I/O

Tracking error signal output.

Connects the sled error signal LPF capacitor.

Sled error signal output.

ADIP FM signal output.

ADIP signal comparator input.

Connects the ADIPAGC capacitor.

ADIP2 binary value signal output.

13 output / temperature signal output. Switched with serial commands.

Focus error signal output.

Reflection light quantity signal output for the main beam servo detector.

RF/ABCD bottom hold signal output.

Peak hold signal output for the RF/ABCD signals.

RF equalizer output.

Connects the RFAGC capacitor.

RFAGC input.

User comparator output.

User comparator non-inverted input.

Connects the capacitor for ADIP amplifier feedback circuit.

I/O

User operational amplifier output.

User operational amplifier inverted input.

RF amplifier output. Eye pattern checkpoint.

Input of the groove RF signal with AC coupling.

Groove RF signal output.

Function

2-2

CXA8069M(IC450):Sensorless Motor Driver

1.Pin Layout

48 37

XM-P55

XM-PJ1

2.Block Diagram

VF UF

COMF

CPOUT

CPC2

CP2

CPC1

CP1

VCO

RMAX

RMIN

12 1

13 24

Charge Pump

VCO

UIN

VIN

Voltage Driver

WIN

+ -+ -+ -

Sensorless Logic

COM

UOUT

Power Stage

Level Shifter

VOUT

WOUT

Sample

and Hold

PGND RF

GND

FC FG2

VCOIN

VCC

Phase

Comparator

Timing

Controllor

MCLOCK

1/8

S/S

PWM

F/R

BRAKE

Full Wave Rectifier

Controllor

+ -

VCONT

RESET CLOCK

SLOPE OSC

VCREF

2-3

XM-P55 XM-PJ1

Pin Functions

Pin Name Functions

No.

2-4

Non connection Detection of motor current Motor driven power supply Non connection Connect first condenser of charge pump to this terminal. Connect first condenser of charge pump to this terminal. Connect second condenser of charge pump to this terminal. Connect second condenser of charge pump to this terminal. Connect last condenser of charge pump / VG external input Ground of circuits except for output section Start / Stop Brake Speed control Reference voltage of speed control FG pulse output FG pulse output when pin15 FG signal goes half round Correction of frequency characteristic of speed control loop Setting of VCO oscillation frequency Setting of VCO maximum oscillation frequency Setting of VCO minimum oscillation frequency Forms motor waveform Forms motor waveform Forms motor waveform Forms motor waveform VCO oscillation frequency control Monitors CLOCK signal Ground of circuits except for output section Sample board for output current detection Forms saw-tooth wave for PWM wave formation Forms santooth waveform for soft switching wave formation Clock input Power supply except for output section Non connection Motor driven power supply Detection of motor current Non connection Reset for operation check Detection of counter electromotive voltage Motor source output Non connection Detection of counter electromotive voltage Motor source output Non connection Non connection Detection of counter electromotive voltage Motor source output Detection of motor common voltage Ground for output guard

CXD2655R (IC351):Digital Servo Processor

Block Diagram

XM-P55

XM-PJ1

2-5

XM-P55 XM-PJ1

Pin Function Description

Symbol

No.

Functions and Operations

Monitor input and output Monitor output Monitor output Monitor output Data input of microcomputer serial interface Shift lock input of microcomputer serial interface

Latch input of microcomputer serial interface/ Latch at the Falling edge

Date output of microcomputer serial interface

Output of internal status corresponding to microcomputer serial interface address

Reset input L : reset Disc sub cord Q sync / ADIP sync output Test pin Input of external audio data to internal DAC DAC power supply Integrated DAC Lch output Crystal oscillation circuit input (512Fs=22.5792MHz) Crystal oscillation circuit output (Inverted output of OSCI) Integrated DAC Rch output DAC ground Test pin Detection of Lch zero data / flag output Out put of digital audio interface signal

Interrupt request output L: When the interrupt status occurs.

Output of audio date to external audio block LRCK to external audio block (44.1kHz) Output pin (2.8224MHz) 256Fs output (11.2896MHz) Digital power supply External DRAM address output External DRAM address output External DRAM address output External DRAM address output External DRAM address output External DRAM address output External DRAM address output External DRAM address output External DRAM address output External DRAM address output External DRAM address output Digital ground External DRAM output enable External DRAM CAS output External DRAM address output External DRAM RAS output External DRAM write enable External DRAM date bus External DRAM date bus External DRAM date bus External DRAM date bus External VCO (784Fs) clock input

Pin No.

Symbol

Functions and Operations

Playback EFM full-swing output Playback EFM comparator slice voltage input Analog power supply Playback EFM comparator bias current input Playback EFM RF signal input Analog ground

Phase comparison output for analog PLL of EFM decoder

Phase comparison output for master PLL of playback digital PLL

Filter input for master PLL of playback digital PLL Filter output for master PLL of playback digital PLL

Internal VCO control voltage input for master PLL of playback digital PLL

Peak hold signal input for quantity of light Bottom hold signal input for quantity of light Signal input for quantity of light Focus error signal input Auxiliary input 1 Center voltage input Monitor output of A/D converter input signal Analog power supply

Input of upper-limit voltage of the A/D converter operating range

Input of lower-limit voltage of the A/D converter operating range

Analog ground Sled error signal input Tracking error signal input Auxiliary input 2 Connect to the low-impeddance power supply Error signal input for laser digital APC ADIP binary FM signal (22.05 Output for setting of CXA 2523 current source Latch output for CXA 2523 control Shift lock output for CXA 2523 control Data output for CXA 2523 control Reference PWM output for laser APC PWM output for laser digital APC Tracking servo drive PWM output ( Tracking servo drive PWM output ( Digital power supply Focus servo drive PWM output ( Focus servo drive PWM output ( 4Fs output (176.4kHz) Sled servo drive PWM output ( Sled servo drive PWM output ( Spindle servo drive PWM output ( Spindle servo drive PWM output ( FG input of spindle CAV servo Test pin Test pin Test pin Digital ground Detection of Rch zero date / flag output

1kHz) input

) )

2-6

HD6433045SV14X (IC501): Beams Microcomputer

Terminal Layout

Block Diagram

XM-P55

XM-PJ1

Port 3

Address bus

Data bus (upper level)

Data bus (lower level)

Clock generator

Port 4

Port 5Port 2

Interrupt controller

DMA

ROM

Mask ROM

Port 6Port 8

PROM Flash memory

RAM

16 bits

integrated

timer unit

(ITU)

controller

(DMAC)

Refresh

controller

Watch dog timer

(WDT)

Serial communication

interface (SCI)

2ch

Bus Controller

Port 1Port 9

Programmable

timing pattern

controller (TPC)

A/D converter

D/A converter

Port B Port A Port 7

2-7

XM-P55 XM-PJ1

Description

Symbol

No.

Function and Operation

Power supply

Communications line terminals to CXA2523AR, connect to XSTB terminal Communications line terminals to CXA2523AR, connect to SWDT terminal Communications line terminals to CXA2523AR, connect to SCLK terminal Communications line terminals to CXA2523AR, connect to XLAT terminal

Non connection Non connection Connect to XRST terminal of CXD2655R Connect to XLAT terminal of CXD2655R Supplies +12V when flash memory is writing. Ground Remote control UART output Connect to SWDT terminal of CXD2655R Remote control URAT input Connect to SRDT terminal of CXD2655R Non connection Connect to SCLK terminal of CXD2655R RF source pre-charge output Laser ON / OFF output RF source OFF output Sled driven voltage ON/OFF Ground Clear signal of power supply circuit flip-flop MUTE output for audio circuit Starting control output Debug / test mode Parallel mode monitor Parallel mode monitor Parallel mode monitor Parallel mode monitor Debug / test mode Debug / test mode Debug / test mode Sleep function enable input Power supply Non connection Non connection Non connection Non connection Non connection Non connection Non connection Non connection Ground Non connection Ground Non connection Non connection LSI source down detective input ALL tracks repeat key input

Pin No.

Symbol

Function and Operation

Connect to MPC17A39 power save terminal Connect to CXA8069 start / stop terminal CXD2655R monitor output selection CXD2655R monitor output selection CXD2655R monitor output selection CXD2655R monitor output selection Ground PLAY key input Starting signal output for power supply circuit Remote control power OFF Non connection Power supply Microcomputer reset input Power supply Ground Connect to Crystal NAX0275-001X Connect to Crystal NAX0275-001X Power supply EEPROM2 chip select terminal output EEPROM communication serial clock output EEPROM communication serial DATA output EEPROM chip select terminal output Power supply Power supply Power supply Power supply Power supply Key input (analog) Non connection Non connection Battery voltage input (analog) Non connection Connect to temperature-detective thermistor Remote control PLAY key input Disc detective switch input Ground Connect to XINT terminal of CXD2655R Connect to SQSY terminal of CXD2655R Non connection Non connection Non connection Ground Connect to MINT0 terminal of CXD2655R Non connection Connect to BEEP of audio circuit Connect to MINT3 terminal of CXD2655R Connect to SENS terminal of CXD2655R EEPROM communication serial data input Non connection ACTIVE CLEAR BASS circuit ON / OFF output

2-8

MPC17A39DTB-X (IC400):4Channel Bridge Driver

XM-P55

XM-PJ1

Terminal Layout

Block Diagram

Pin Function Description

Pin No.

Symbol

Functions and Operations

DC / DC Converter circuit ground External CLOCK input connection Standby mode control Output enable Driver power supply Driver output Power ground Driver output Driver power supply Driver power supply Driver output Power ground Driver output Driver power supply CH 1 control signal input CH 1 control signal input CH 2 control signal input CH 2 control signal input

No.

Symbol

Functions and Operations

CH 4 control signal input CH 4 control signal input CH 3 control signal input CH 3 control signal input Driver output Driver output Power ground Power ground Driver power supply Driver power supply Driver output Power ground Driver output Driver power supply Control circuit ground

DC / DC Converter boosting inductance, diode ground

Control circuit power supply Pre-driver circuit power supply

2-9

XM-P55 XM-PJ1

MB3800PFV-W(IC931):Switching Regulator Controller

Terminal Layout

Block Diagram

Reference

voltage

Soft start

S.C.P

Pin Function Description

Pin No. Symbol Functions and operations

Error amplifier inversion input Soft start, capacity for SCP setting connection Power supply Output current setting, control Totem-pole output Ground

Capacity for oscillation frequency setting, resistant connection

Error amplifier output

Santooth

wave generator

Output drive

control circuit

2-10

MN41X17400CTT10X(IC391):DRAM

XM-P55

XM-PJ1

Terminal Layout

Block Diagram

RAS CAS

0 10

VSS VDD

0 10

Row Address Buffer

Column Address Buffer

On Chip VBB Generator

Clock Generator

CBR Refresh Counter

Row

Decoder

Pin Functions

Symbol

Word

Driver

Function Address input Row address / strove Column address / strove Write enabling input. Output enabling input. Data input Power supply (

3.3V) Power supply (0V) Non connection

Memory Cell

Sense. Amp

Column Decoder

I/O

Selector

Write Clock Generator

Data Input Buffer

Data Output Buffer

DQ0

DQ3

2-11

XM-P55 XM-PJ1

Removal of Main Parts

<XM-P55 Section>

Removing the MD Door Assembly and

the Bottom Cover (See Fig.1 to 4)

Move the door lever and open the door.

Remove the four A screws attaching the MD door assembly and remove the MD door assembly from the body.

Reverse the body and remove the six B screws attaching

3. the bottom cover.

Release the joint a outside and remove the bottom cover

4. from the body.

CAUTION: When reassembling the bottom cover, fit the

part b of the hold knob slot to the hold switch on the main board (See Fig.4, 5).

MD door assembly

Fig.1

Bottom cover

Part b

Part a

Door lever

Fig.2

Bottom cover

Fig.4Fig.3

2-12

XM-P55

XM-PJ1

Removing the Main Board

(See Fig.5 to 7)

Remove the three C screws and the screw D attaching the main board.

Unsolder the part c of the battery terminal.

Open the battery lid and remove it from the flame assembly.

Remove the headphone jack assembly while pulling the

4. cabinet assembly of the headphone jack outwards.

Move the main board in the direction of the arrow in Fig.6

5. and remove it upward from the two parts d of the bending on the flame assembly.

Disconnect the flexible harnesses from connector CN300

6. and CN401 on the reverse side of the main board.

Main board

Hold switch

Part c : unsoldering

Fig.5

Parts d

CN401

Flame assembly

Headphone jack assembly

Battery lid

Fig.6

Main board

Fig.7

CN300

2-13

XM-P55 XM-PJ1

Removing the Mechanism Assembly

(See Fig.8)

1. Remove the two E screws attaching the mechanism assembly and remove the mechanism assembly from the flame assembly.

Flame assembly

Mechanism assembly

Fig.8

2-14

Removal of Main Parts

<XM-PJ1 Section>

Removing the Bottom Cover

(See Fig.1 to 3)

Move and remove the battery lid of the bottom cover assembly on the side of the body in the direction of the arrow.

Remove the two A screws attaching the bottom cover on the bottom of the body.

Remove the two B screws attaching the bottom cover on

3. the side of the body.

Remove the bottom cover from the body while releasing

4. the tab a of the bottom cover on the side of the hold switch to the inside.

CAUTION: When reassembling, make sure that the

convexity of the hold switch is fitted to the concave of the switch knob before inserting the tab a of the bottom cover assembly.

Bottom cover assembly

XM-P55

XM-PJ1

Battery lid

Bottom cover assembly

Fig. 1

Battery lid

Hold switch

Fig. 2

Bottom cover assembly

Fig. 3

Switch knobJoint a

2-15

XM-P55 XM-PJ1

Removing the Front Cover Assembly

(See Fig.4)

Remove the bottom cover assembly.

Remove the two C screws attaching the front cover assembly, and remove the front cover assembly while turning it in the direction of the arrow in the Fig.4.

Removing the Cabinet (See Fig.5 to 8)

Remove the bottom cover assembly.

Remove the front cover assembly.

Remove the screw D attaching the cabinet on the upper side of the body.

Reverse the body and remove the two E screws attaching the cabinet on the back of the body.

Release the two joints b on the flame assembly side of

5. the battery case in the direction of the arrow, and remove the cabinet from the flame assembly.

Unsolder the two harnesses (one is orange, the other is

6. gray) connected to the main board. Disconnect the battery connector B with the brown harness by pulling upward.

CAUTION: When reassembling, attach the harnesses

with a double-sided tape to the part c on the inside of the cabinet (See Fig.8).

Cabinet

Flame assembly

Front cover assembly

Fig. 4

Main board

Fig. 5

2-16

Cabinet

Main board

Fig. 7

Unsoldering

Battery connector B

Joints b

Part c

Cabinet

Fig. 6

Cabinet

Main board

Fig. 8

Removing the Main Board

(See Fig.9 to 11)

Remove the four F screws attaching the main board.

Remove the headphone jack fixed with a double-sided tape upward.

Unsolder the part d of the main board.

Remove the flexible harness 1 fixed to the front side of the flame assembly with a double-sided tape.

Move the battery terminal e from the flame assembly upward.

Move the main board to the inside, and remove it upward

6. while releasing it from the two hinges f on the bending of the flame assembly.

Disconnect the flexible harnesses from connector CN300

7. and CN401 on the reverse side of the main board.

CAUTION: When reattaching the flexible harness 1,

position it to the six g points and fix it with a double-sided tape (See Fig.10).

Headphone jack

Main board

Fig. 9

Joints f

Part d

XM-P55

XM-PJ1

Battery terminal e

Positioning

points g

Positioning points g

Fig. 10

Main board

CN401

CN300

Fig. 11

2-17

XM-P55 XM-PJ1

Removing the Door Cover

(See Fig.12, 13)

Remove the bottom cover.

1. Remove the front cover.

2. Remove the cabinet.

3. Push the lower part of the door lock lever outside on the

4. lower front side of the body, and open the door.

Remove the two G screws attaching the door cover on

5. both sides of the body, and remove the door cover.

CAUTION: When reattaching the flexible harness 1,

position it to the six g points and fix it with a double-sided tape (See Fig.10).

Door cover

Door lock lever

Fig. 12

Door cover

Removing the Mechanism Assembly

(See Fig.14)

Remove the bottom cover.

Remove the front cover.

Remove the cabinet.

Remove the main board.

Remove the two H screws attaching the mechanism assembly and remove the mechanism assembly from the flame assembly.

Door lock lever

Mechanism assembly

Flame assembly

Fig. 13

Flame assembly

2-18

Fig. 14

Removing the Holder Assembly

(See Fig.1, 2)

Turn the holder assembly as shown in Fig.1.

1. Push the stopper of the holder assembly to release its

2. tab, and turn the holder assembly as shown in Fig.2. Move the part a of the holder assembly in the direction of the arrow and release its U-shaped notch from the shaft of the chassis assembly.

Push the part b of the holder assembly and pull out the

3. holder assembly from the shaft of the chassis assembly.

CAUTION: When reassembling, first attach the part (b)

of the holder assembly to the shaft of the chassis assembly. Next, attach the U-shaped notch to the shaft.

XM-P55

XM-PJ1

Holder Assembly

Stopper

Push inside

Fig.1

Holder assembly

Shaft

U-shaped notch

Removing the Spindle Motor

(See Fig.3)

1.2.Unsolder the part c of the flexible harness connected to the spindle motor.

Remove the three A screws attaching the spindle motor and remove the spindle motor from the chassis assembly.

Chassis assembly

Part a

Fig.2

Chassis assembly

Part b

Chassis assembly

Part c : unsoldering

Fig.4

Fig.3

Spindle motor

2-19

XM-P55 XM-PJ1

Removing the Pickup Unit

(See Fig.4, 5)

Remove the slit washer on the reverse side of the MD mechanism and remove the worm gear.

Remove the screw B and the hold spring. Detach the shaft of the pickup unit on the feed motor

3. side, and the other side.

Remove the spacer of the flexible harness extending from

4. the pickup unit (marked d), and remove the pickup unit from the chassis assembly.

Slit washer

Worm gear

Chassis assembly

Hold spring

Removing the Pickup (See Fig.5, 6)

1.2.Remove the screw C from the pickup unit and the lead spring.

Pull out the main shaft from the pickup.

Guide base

Fig.4

Hold spring

Part e

Pickup unit

Shaft

2-20

Pickup

Lead spring

Feed motor

Fig.5

Main shaft

Fig.6

(Fold fast.) (Attach a spacer.) (Fix fast not to unfold.) (Fold fast.)

Prior to performing the following procedures, fold the flexible harness of the pickup unit (see Fig.7,8 and 9). Fix the flexible harness with a spacer not to unfold.

Attach the U-shaped slot of the pickup marked ’e’ to the guide base.

For the shaft, firstly attach its shaft base side and next

3. attach its feed motor base side.

XM-P55

XM-PJ1

Fig.7

Hold spring

Part e

Pickup unit

Shaft

Attach a spacer to the folded flexible harness and fix the

4. flexible harness to the chassis assembly (see Fig.7, 8).

Attach a spacer between the chassis boss and the

5. flexible harness (see Fig.9).

Make sure that the flexible harness is folded fast and

6. fixed to the right position.

Attach a spacer

Guide base

Feed motor

Fig.5

Attach a spacer

Attach this position

Fig.8

Chassis assembly

Flexible harness

Spacer

Chassis boss

Spacer

Chassis boss

Fig.9

2-21

XM-P55 XM-PJ1

Removing the Feed Motor/ Screw Shaft Assembly and Wheel Gear

Unsolder the two harnesses extending from the feed motor.

Remove the screw D attaching the feed motor, then the spring. Remove the feed motor from the feed motor base.

Lift the feed motor base and pull out the screw shaft

3. assembly.

Screw shaft gear

Shaft base

Feed motor

Wheel gear

Spring

Feed motor base

Soldering

Fig.10

2-22

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