JVC XM-P55 User manual

SERVICE MANUAL
PORTABLE MINIDISC PLAYER
No.20738
Jan. 1999
COPYRIGHT 1999 VICTOR COMPANY OF JAPAN, LTD.
Printed in Japan
9901 (V )
VICTOR COMPANY OF JAPAN, LIMITED
AUDIO DIVISION,10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
XM-P55
XM-PJ1
(No.20738)
XM-P55
XM-PJ1
XM-P55
XM-PJ1
Contents
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
Block Diagrams
Standard Schematic Diagrams (XM-P55)
Standard Schematic Diagrams (XM-PJ1)
Printed Circuit Boards
Parts List (XM-P55)
Parts List (XM-PJ1)
1-2
1-3~16
2-1
2-12
2-23
2-23
2-24
2-27
2-29
2-36
2-42,43
3-1~15
4-1~15
B
E
EE
EN
J
UB
US
UT
UX
UY
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)
Area Suffix
B
E
EE
EN
J
UB
US
UT
UX
UY
(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)
OPEN
X
M
-
P
5
5
XM-P55 XM-PJ1

1-2 4-15
XM-P55
XM-PJ1
XM-P55
XM-PJ1
CAUTION
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.
Safety Precaution
Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.
Packing Parts List
Accessories Parts List

XM-P55
XM-PJ1
2-1
37
38
PEAK
RF
39RFAGC
40AGCI
41COMPO
42COMPP
43ADDC
44OPO
45OPN
46RFO
47MORFI
48
1 2
MORFO
24
23
Vcc
3TADJ
22 EQADJ
21 VREF
20 F0CNT
19 XSTBY
18 XLAT
17 SCLK
16 SWDT
15 TEMP R
14 TEMP I
13 GND
I
J
3
VC
4
A
5
B
6
C
7
D
8
E
9
F
10
PD
11
APC
12
APCREF
36 35
BOTM ABCD
34
FE
33
AUX
32
ADFG
31
ADAGC
30
ADIN
29
ADFM
28
SE
27
CSLED
26
TE
25
WBLADJ
Peak, Bottom Detector
AGC, EQ
USER
Comp
USER
OP Amp
RF Amp
3T Detector
ABCD Amp
I-V Amp APC
TEMP Amp
MUX FE Amp
ADIP Amp TE/SE Amp
CPU
Command I/F
CXA2523AR(IC310):MD RF & Servo
1.Block Diagram
2.Pin Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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.
I
J
VC
A
B
C
D
E
F
PD
APC
APCREF
GND
TEMPI
TEMP R
SWDT
SCLK
XLAT
XSTBY
F0CNT
I
I
O
I
I
I
I
I
I
I
O
I
-
I
I
I
I
I
I
I
Pin No.
Symbol I/O Function
Description of Major ICs

XM-P55
XM-PJ1
2-2
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
Reference voltage output.
Equalizer center frequency setting pin.
BPF3T center frequency setting pin.
Power supply.
BPF22 center frequency setting pin.
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.
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.
VREF
EQADJ
3TADJ
Vcc
WBLADJ
TE
CSLED
SE
ADFM
ADIN
ADAGC
ADFG
AUX
FE
ABCD
BOTM
PEAK
RF
RFAGC
AGCI
COMPO
COMPP
ADDC
OPO
OPN
RFO
MORFI
MORFO
O
I/O
I/O
-
I/O
O
-
O
O
I
-
O
O
O
O
O
O
O
-
I
O
I
I/O
O
I
O
I
O
Pin No.
Symbol I/O Function

XM-P55
XM-PJ1
2-3
CXA8069M(IC450):Sensorless Motor Driver
48 37
13 24
12 1
25 36
UIN VIN WIN COM UOUT VOUT WOUT
PGND
RF
CF
GND
FC
FG2
FG
RESET
CLOCK
SLOPE
OSC
VS
WF
VF
UF
COMF
CPOUT
CPC2
CP2
CPC1
CP1
VCO
RMAX
RMIN
VCOIN
VCC
MCLOCK
S/S
BRAKE
VCONT
VCREF
+ -
+ -+ -+ -
Voltage Driver Power Stage
Level Shifter
Charge
Pump
VCO Sensorless
Logic
Phase Comparator
1/8
Timing Controllor
PWM
F/R Controllor
Full Wave
Rectifier
Sample and Hold
1.Pin Layout
2.Block Diagram

XM-P55
XM-PJ1
2-4
Pin Functions
Pin
No.
Pin Name Functions
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

XM-P55
XM-PJ1
2-5
CXD2655R (IC351):Digital Servo Processor
Block Diagram

XM-P55
XM-PJ1
2-6
Pin Function Description
Monitor input and output
Monitor output
Monitor output
Monitor output
Data input of microcomputer serial interface
Shift lock input of microcomputer serial interface
Date output of microcomputer serial interface
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
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
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
Filter input for master PLL of playback digital PLL
Filter output 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
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 1kHz) input
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
Pin
No. Symbol Functions and Operations
Latch input of microcomputer serial interface/
Latch at the Falling edge
Output of internal status corresponding to
microcomputer serial interface address
Phase comparison output for analog PLL of
EFM decoder
Phase comparison output for master PLL of
playback digital PLL
Internal VCO control voltage input for master PLL of
playback digital PLL
Input of upper-limit voltage of the A/D converter
operating range
Input of lower-limit voltage of the A/D converter
operating range
Interrupt request output L:When the interrupt
status occurs.
Pin
No. Symbol Functions and Operations

XM-P55
XM-PJ1
2-7
HD6433045SV14X (IC501): Beams Microcomputer
Address bus
Data bus (upper level)
Data bus (lower level)
Port 3
Port 6Port 8
Port 5Port 2
Bus Controller
Port 1Port 9
Clock generator
Port 4
Interrupt controller
ROM
Mask ROM
PROM
Flash memory
16 bits
integrated
timer unit
(ITU)
DMA
controller
(DMAC)
Refresh
controller
Watch dog timer
(WDT)
Serial communication
interface (SCI) 2ch
Programmable
timing pattern
controller (TPC)
A/D converter
D/A converter
RAM
Terminal Layout
Block Diagram
Port B Port A Port 7

XM-P55
XM-PJ1
2-8
Description
Pin
No.
Symbol Function and Operation
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
Power supply
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
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

XM-P55
XM-PJ1
2-9
MPC17A39DTB-X (IC400):4Channel Bridge Driver
Terminal Layout
Pin Function Description
Block Diagram
Pin
No. Pin
No.
Symbol Functions and Operations 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
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
Control circuit power supply
Pre-driver circuit power supply
DC / DC Converter boosting inductance, diode ground

XM-P55
XM-PJ1
2-10
MB3800PFV-W(IC931):Switching Regulator Controller
Terminal Layout
Block Diagram
Pin Function Description
Reference
voltage
Soft start
S.C.P
Output drive
control circuit
Santooth
wave generator
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

XM-P55
XM-PJ1
2-11
MN41X17400CTT10X(IC391):DRAM
Terminal Layout
Block Diagram
Pin Functions
Symbol 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
OE
DQ0DQ3
WE
RAS
CAS
10
0
VSS
VDD
0 10
0 10 Row
Address
Buffer
Column
Address
Buffer
On Chip
VBB
Generator
CBR Refresh
Counter
Row Decoder
Word Driver
Memory
Cell
Sense.
Amp
Column
Decoder
I/O Selector
Data
Output
Buffer
Data
Input
Buffer
Write
Clock
Generator
Clock Generator

XM-P55
XM-PJ1
2-12
Removal of Main Parts
Removing the MD Door Assembly and
the Bottom Cover (See Fig.1 to 4)
1.
2.
3.
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
the bottom cover.
Release the joint a outside and remove the bottom cover
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).
Fig.1
Fig.2
Fig.4Fig.3
MD door
assembly
MD door assembly
Bottom cover
Part a
Part b
Bottom cover
A
Door lever
A
B
B
BB
B
B
<XM-P55 Section>

XM-P55
XM-PJ1
2-13
Removing the Main Board
(See Fig.5 to 7)
1.
2.
3.
4.
5.
6.
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
cabinet assembly of the headphone jack outwards.
Move the main board in the direction of the arrow in Fig.6
and remove it upward from the two parts d of the
bending on the flame assembly.
Disconnect the flexible harnesses from connector CN300
and CN401 on the reverse side of the main board.
Fig.5
Fig.6
Fig.7
Hold switch
Main board Part c : unsoldering
Main board
Headphone jack assembly
Flame assembly
Parts d
Battery lid
CN300
CN401 Main board
C
CD

XM-P55
XM-PJ1
2-14
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.
Fig.8
Mechanism assembly
E
E
Flame assembly

XM-P55
XM-PJ1
2-15
Removal of Main Parts
Removing the Bottom Cover
(See Fig.1 to 3)
1.
2.
3.
4.
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
the side of the body.
Remove the bottom cover from the body while releasing
the tab a of the bottom cover on the side of the hold
switch to the inside.
1.
2.
3.
4.
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.
Battery lid
Bottom cover assembly
B
A
A
Bottom cover assembly Battery lid
Bottom cover assembly
Hold switch
Switch knobJoint a
Fig. 1
Fig. 3
Fig. 2
<XM-PJ1 Section>

XM-P55
XM-PJ1
2-16
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.
1.
2.
CAUTION: When reassembling, attach the harnesses
with a double-sided tape to the part c on the
inside of the cabinet (See Fig.8).
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
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
gray) connected to the main board. Disconnect the
battery connector B with the brown harness by pulling
upward.
1.
2.
3.
4.
5.
6.
Fig. 8
Fig. 6
Fig. 5
Fig. 4
Fig. 7
Front cover assembly
C
C
D
Cabinet
E
Flame assembly Main board
Joints b Cabinet
Cabinet
Battery connector B
Unsoldering
Main board
Cabinet
Main board
Part c

XM-P55
XM-PJ1
2-17
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
while releasing it from the two hinges f on the bending of
the flame assembly.
Disconnect the flexible harnesses from connector CN300
and CN401 on the reverse side of the main board.
1.
2.
3.
4.
5.
6.
7.
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).
Fig. 9
Fig. 10
Fig. 11
Main board
F
F
Battery
terminal e
F
Part d
F
Main board
F
Joints f
F
Positioning points g
Positioning points g
Main board
CN401
CN300
Headphone jack
Positioning
points g

XM-P55
XM-PJ1
2-18
Removing the Door Cover
(See Fig.12, 13)
Remove the bottom cover.
Remove the front cover.
Remove the cabinet.
Push the lower part of the door lock lever outside on the
lower front side of the body, and open the door.
Remove the two G screws attaching the door cover on
both sides of the body, and remove the door cover.
1.
2.
3.
4.
5.
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).
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.
1.
2.
3.
4.
5.
Fig. 12
Fig. 13
Fig. 14
Door cover
G
Door lock lever
G
Door lock lever Flame assembly
Door cover
H
Flame assembly
Mechanism assembly
H