JVC XM-PX50WT User manual

SERVICE MANUAL
PORTABLE MINIDISC PLAYER
No.20902
Jan. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
XM-PX50WT
XM-PX50WT
Area Suffix
UB Hong Kong
Contents
Safety Precautions
Important for laser products
Attention when
MD pick up is exchanged
Disassembly method
Adjustment method
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-2
1-3
1-4
1-5
1-11
1-12
1-12
1-13~25

XM-PX50WT
1-2
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.).
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
!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.

XM-PX50WT
1-3
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.
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.
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.
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)
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.

XM-PX50WT
1-4
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.
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.
2. About the earth processing for the electrostatic destruction prevention
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.
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 .
Conductive material (conductive
sheet) or the iron plate
anti-static wrist strap
Attention when MD pickup is exchanged
1. About the static electricity protection measures
Solder short
1) Please be sure to solder before a flexible wire is removed from connector on a main printed
circuit board as shown.
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
connector.

XM-PX50WT
1-5
Shift the door lever to open the door.
Remove the four screws Aand detach the MD door
assembly from the main body.
1.
2.
Disassembly method
Removing the MD door assembly
(See Fig.1 and 2)
Prior to performing the following procedure, remove
the MD door assembly.
Turn the Holder assembly as shown in Fig.3.
Pull the side arm (L) marked aand remove outward.
Open the Holder assembly as
shown in Fig.4.
Move the “U-shaped”notch marked bin the direction
of the arrow and release it from the shaft.
Move the part cinward and pull out the Holder
assembly from the shaft.
1.
2.
3.
4.
Removing the holder assembly
(See Fig.3 and 4)
When reassembling, first reattach the
part cto the shaft of the Chassis
assembly. And next, fit the “U-shaped”
notch to the shaft.
ATTENTION:
MD door assembly
Door lever
A
A
Fig.1
Fig.2
Fig.3
Part a
Part b
”U-shaped”notch
Part c Shaft
Side arm (L)
MD door assembly
Door lever
Holder
assembly
Holder assembly
Holder assembly
Part c
Holder
assembly
Fig.4

XM-PX50WT
1-6
Prior to performing the following procedure, remove
the MD door assembly and the holder assembly.
Open the battery lid. Release the tab dand pull out
the battery lid.
Remove the screw Band pull out the side arm (R)
upward.
Remove the two screws Cand pull out the eject unit.
Remove the screw D, E, Fand G attaching the
chassis assembly respectively.
Disengage the three joints eof the bottom case and
the battery holder. Remove the chassis assembly
and the jack cover at once.
1.
2.
3.
4.
5.
Removing the chassis assembly
(See Fig.5 to 7)
Chassis assembly
Side arm (R)
Battery lid
Tab d Joint e
B
C
Eject unit
C
G
D
F
E
Bottom case
Battery holder
Joints e
Battery lid
Chassis assembly
Fig.5
Fig.6
Fig.7
Chassis assembly
Joint e
Joints e

XM-PX50WT
1-7
Solder the short circuit round of the flexible wire on
the main board.
Disconnect the flexible wires from connector CN301
and CN401 on the main board.
Remove the one screw Hattaching the main board.
Remove the main board with the battery holder .
Unsolder the four soldered parts fretaining the main
board and the battery holder.
1.
Removing the main board and the
battery holder (See Fig.8 and 9)
Prior to performing the following procedures, remove
the MD door assembly, the holder assembly and the
chassis assembly.
Prior to performing the following procedures, remove
the MD door assembly, the holder assembly, chassis
assembly and the main board.
Disconnect the flexible wire extending from the
headphone jack from connector CN601 on the main
board.
1.
When reassembling, connect the
flexible wire extending from the pickup
to the connector on the main board
and unsolder the short circuit round.
ATTENTION:
Before disconnecting the flexible wire
extending from the pickup, make sure to
solder the short circuit round to prevent
damage to the pickup.
ATTENTION:
Removing the headphone jack assembly
(See Fig.10)
Soldering f
Battery holder
H
CN401
CN301
Headphone jack assembly Main board
Battery holder
Headphone jack assembly
CN601
CN401
CN301
Fig.8
Fig.9
Fig.10
Soldering f
Short circuit
round
Short circuit round
Main board

XM-PX50WT
1-8
Unsolder the part gon the flexible wire extending
from the underside of the Chassis assembly to the
spindle motor.
1.
Remove the three screws Iattaching the spindle
motor.
2.
Removing the spindle motor
(See Fig.11)
Remove the slit washer and the worm gear from the
underside of the Chassis assembly.
Remove the screw Jattaching the shaft holder and
draw out the shaft (lead screw).
Pull out the Pickup unit and the lead screw while
disengaging the part hand i.
1.
2.
3.
Removing the pickup unit (See Fig.11)
Prior to performing the following procedures, remove
the MD door assembly, the holder assembly, the
chassis assembly and the main board.
<Removal of the MD
mechanism section>
Do not spill flux on the gear and others.
ATTENTION:
When handling the Pickup unit, touch the
parts marked in Fig.13 only.
ATTENTION:
Remove the screw Kand the lead spring.
Pull out the shaft from the pickup.
1.
2.
Removing the pickup (See Fig.12 and 13)
When handling the pickup unit, touch the
parts marked in Fig.13 only.
ATTENTION:
Lead screw K
Lead spring
Touch these parts only.
Worm gear
Slit washer
I
J
Shaft holder
Spindle motor
Soldering g
Part h
Part i
Chassis assembly
Fig.11
Fig.12
Fig.13
Pickup unit
Pickup

XM-PX50WT
1-9
Peel off the adhesive tape jon the flexible wire on
the underside of the feed motor.
Unsolder soldering kconnecting the flexible wire to
the feed motor.
Remove the two screws Lattaching the feed motor.
1.
2.
3.
Removing the feed motor (See Fig.14)
When reassembling, reattach the
flexible wire with an adhesive tape and
solder.
ATTENTION:
Chassis assembly
Feed motor
j
Soldering k
L
Pickup unit
L
Fig.14

XM-PX50WT
1-10
Remove the four screws Aon the bottom of the
body.
Remove the top cover upward while pushing the
front part a. Pull out the charge board from the
bottom cover.
1.
2.
Removing the charge board
(See Fig.1 to 3)
<Charge stand>
Fig.1
Fig.2
Fig.3
AA
A
A
Top cover
Part a
Push
Charge board
Bottom cover

XM-PX50WT
1-11
Adjustment method
This model is auto adjustment by Remote Controller.
Please adjust the attached remote controller.
LCD indication
5. M o T G
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
Servo initialize
LCD Indication change : [ ]
FEED
Executes by < BASS >
LCD Indication change :[FwdBwd]
<VOL+> :Pickup is go to outside
Press < STOP > LCD Indication change :[OK ]
< VOL-> :Pickup is go to inside
MO TG Insert the Recordable disc.
Executes by < BASS >
LCD Indication change : [ ]
MO DISC ADJUST
Executes by < BASS >
LCD Indication change : [ ]
Press < STOP >
LCD Indication change : [OK ]
*MO DISC ADJUST
Pre TG Insert the Pre master disc.
Executes by < BASS >
LCD Indication change : [ ]
Pre DISC ADJUST
Executes by < BASS >
LCD Indication change : [
XXYYZZ ]
Press < STOP >
RESET
Executes by < BASS >
LCD Indication : Left out the test mode ,power off ,and END.
Press < PLAY MODE + DISPLAY + BASS > and < PLAY >key together more than 3sec. at power off condition.
< VOL > next item .< VOL+ >before item.
PLAY LASER Insert the laser power meter.
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 ]
PLAY LASER
7.
*Adjusting
*Adjusting
*Adjusting
*Adjusting
FEED
*
0. TMD-V2
Adjust power-supply voltage 1.5v 20mv before the laser power is adjusted and stops.
Laser power adjust 560 adjust
Equipments----- 1. Remote controller 2. DC power supply
3. Laser power meter 4. MO disc (AU-1)
5. Pre master disc (TGYS 1)
<Test mode setting method>

XM-PX50WT
1-12
Turn off the power switch and,disconnect the
power cord from the ac outlet.
Replace the pickup with a normal one.(Refer
to "Pickup Removal" on the previous page)
Plug the power cord in,and turn the power on.
At this time,check that the laser emits for
about 3seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at TP1.
Finish.
Maintenance of laser pickup
(1) Cleaning the pick up lens
Before you replace the pick up, please try to
clean the lens with a alcohol soaked cotton
swab.
(2) Life of the laser diode
When the life of the laser diode has expired,
the following symptoms will appear.
1. The level of RF output (EFM output:ampli
tude of eye pattern) will below.
Is the level of
RFOUT under
0.35Vp-p? Replace it.
NO
YES
O.K
(3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is
attached to the pickup is used to adjust the laser power.Since this adjustment should be performed to match the
characteristics of the whole optical block, do not touch the semi-fixed resistor.
If the laser power is lower than the specified value,the laser diode is almost worn out, and the laser pickup should
be replaced.
If the semi-fixed resistor is adjusted while the pickup is functioning normally,the laser pickup may be damaged
due to excessive current.
Replacement of laser pickup

XM-PX50WT
1-13
2. Block diagram
19
20
21
22
23
24
123456
7
8
9
10
11
12
13
14
15
16
17
18
PW
SW
PW
SW
MT
SW
MT
SW
BST
SW
BST
SW
BEEP
BEEP
IN
Vref Vref
Vref
IN
BST1
BST2
BST
AGC
PW
B
PW
A
MT
TC GND
ADD
IN
BST
NF1
LPF
BST
NF
BST
OUT
AGC
IN
DET
OUT
2
2
B
PWR
GND
CUT
A
V
CC2
BEEP
OUTA
BEEP
OUTB
INA
INB
V
CC1
JCV8002-W (IC601) : Head phone amp
1. Pin layout
3. Pin function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
V
OUT
PWR GND
OUT
DET
AGC IN
BST OUT
BST NF
LPF
BST NF
ADD IN
V
V IN
GND
BEEP IN
BST SW
MT SW
PW SW
MT TC
V
IN
IN
BEEP OUT
V
Power amplifier output
GND in power amplifier output steps
Power amplifier output
Symbol FUNCTION
CC2 CC2
A
B
2
2
1
ref
ref
CC1 CC
B
A
B
BEEP OUTA
Pin
no. (+B) in power amplifier output steps
Smoothness of level detection of boost
BST amplifier input signal level variable control by input lever to boost AGC input terminal
Output terminal of BST amplifier2
Terminal NF of BST amplifier2
Output BST amplifier1
NF of BST amplifier1
ADD amplifier input
Standard potential circuit
Standard potential circuit
Power part input steps GND
Beep input terminal
Beep output terminal
Mute switch
Power On/OFF switch
Mute smoothing Power mute switch
Main parts V
Power amplifier input
Power amplifier input
Beep output terminal
Beep output terminal
AGC
18
13
24 ~ 19
7 ~ 12
1
6
~ ~
Description of major ICs

XM-PX50WT
1-14
CXA8059Q (IC450) : Motor driver
OSC CLOCK RESET FC CF RF
WOUT VOUT UOUT COM WIN VIN UIN
VSWFVFUFCOMFCPOUT
CPC3
CP3
CPC2
CP2
CPC1
CP1VCO
RMAX
RMINVCOINVCC
MCLOCK
CLKSEL
S/S
BRAKE
VCONT
VCREF
GNDPGNDFG2FGSLOPE
F/R Controllor
Timing controllor
Phase Comparator
1/8
PWM
VCO
Full Wave Rectifilter
Sensoeless Logic
Charge Pump
Voltage Driver
Sample and Hard
1. Pin layout
2. Block diagram
1~12
36 ~25
37
~
48
24
~
13

XM-PX50WT
1-15
3.
Pin function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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
The GND to guard the power stage.
The terminal to detect the voltage.
The terminal to supply the voltage for the power stage.
The terminal to connect the capacitor in the final charge pump.
The terminal to connect the capacitor in the third charge pump.
The terminal to connect the capacitor in the third charge pump.
The terminal to connect the capacitor in the second charge pump.
The terminal to connect the capacitor in the second charge pump.
The terminal to connect the capacitor in the first charge pump.
The terminal to connect the capacitor in the first charge pump.
The GND for the part except the power section.
The terminal for start and stop.
The terminal for braking.
The terminal for controlling velocity.
The terminal as referable voltage of controlling velocity.
The terminal to compensate the frequency characteristics of the loop controlling velocity.
The terminal of sampling and holding for detecting motor current.
The terminal to output FG pulse.
The terminal to output FG pulse divided Pin15 signal by 2.
The terminal to set oscillation frequency of VCO.
The terminal to set maximum oscillation frequency of VCO.
The terminal to set minimum oscillation frequency of VCO.
The terminal to control oscillation frequency of VCO.
The terminal to select inside and outside clock.
The terminal to oscillation sawtooth for PWM signal.
The terminal to oscillation sawtooth for soft-switching signal.
The terminal to monitor CLOCK signal.
The GND for the part except the power section.
The terminal to shape waveform of motor voltage.
The terminal to shape waveform of motor voltage.
The terminal to shape waveform of motor voltage.
The terminal to shape waveform of motor voltage.
The terminal to supply the voltage except the power section.
The terminal to input clock.
The terminal to supply the voltage for the power stage.
The terminal to reset a register for checking the movement.
The terminal to monitor current.
Non connect
Non connect
The terminal to sense the back electro magnetic force of coils.
The terminal to supply the motor current.
The terminal to sense the back electro magnetic force of coils.
The terminal to supply the motor current.
The terminal to sense the back electro magnetic force of coils.
The terminal to supply the motor current.
Non connect
Non connect
The terminal to monitor current.
PGND
COM
VS
CPOUT
CPC3
CP3
CPC2
CP2
CPC1
CP1
GND
S/S
BRAKE
VCONT
VCREF
FC
CF
FG
FG2
VCO
RMAX
RMIN
VCOIN
CLKSEL
OSC
SLOPE
CLOCK
GND
WF
VF
UF
COMF
VCC
MCLOCK
VS
RESET
RF
NC
NC
WIN
WOUT
VIN
VOUT
UIN
UOUT
NC
NC
RF
Pin
no. Symbol Function

XM-PX50WT
1-16
CXD2672GA(IC351):DSP
A-1
A-2
A-3
B-1
B-2
B-3
C-1
C-2
C-3
D-1
D-2
D-3
NC
NC
MNT1
NC
NC
MNT0
MNT3
MNT2
NC
SCLK
SWDT
VDC0
-
-
O
-
-
I/O
O
O
-
I
I
-
Open
Open
Monitor output
Open
Open
Monitor in/output
Monitor output
Monitor output
Open
Micon serial bus clock input
Micon serial bus data write input
Internal logic VDD(1.8V)
1.Pin layout
2.Pin function (1)
LDDR DTRF VSI02 ADFG ADRB AVS2 ADI0 FE PEAK FILI AVS1 ASYI DVSS1
APCR CKRF FOCN APC SE ADRT VC ABCD CLTV PCO BIAS ASYO XWE TST6
TFDR TRDR XLRF VDI02 DCHG TE AVD2 AUX1 BOTH FILO RFI AVD1 MVCI PD0 A11 XOE
FRDR FFDR VDC4
VSC4 SRDR FS4
SPFD SPRD SFDR
TEST2 TEST1 FGIN
TST2 EFM0 TEST3
VSI03 TST3 VDI03
SPCU SPDW SPDV
TST4 SPCW SPCV
VSC5 SLDW SLDV
SLCV SLCU VDC5
BYPS TST5 SLCW
DVDD1 D3 VSC3
VDC3 D0 D2
D1 XCAS IXWE
A09 XRAS IXOE
A07 A10 A08
DVI01 A00 VSI01
A05 A01 A06
A03 A04 A02
F256 XBCK VSC2
VDC2 DADT LRCK
VDI00 TST8 ADDT
MNT1 MNT0 VDC0 SENS XRST RPWR VDI
OSC DVDD0 DA VDDL DA VDDR VREFR TST1 VDC1 TST0 DATAI TST7
MNT2 SWDT SRDT SQSY XINT OSCI DVSS0 AOUTL VREFL AOUTR XTSL DOUT MT
FLGL
MT
FLGR DA
PWMRP
DA
PWMLN
DA
PWMLP
MNT3 SCLK XLAT VSCO DQSY TX OSCO VSI
OSC
DA
VSSL
DA
VSSR VSC1 DIN1 VSI00
TOP
VIEW
ABCDEFG JH KLMNPRTU
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Pin
No. Symbol I/O Function

XM-PX50WT
1-17
E-1
E-2
E-3
F-1
F-2
F-3
G-1
G-2
G-3
H-1
H-2
H-3
J-1
J-2
J-3
K-1
K-2
K-3
L-1
L-2
L-3
M-1
M-2
M-3
N-1
N-2
N-3
P-1
P-2
P-3
U-1
T-1
R-1
U-2
T-2
R-2
U-3
T-3
R-3
U-4
T-4
R-4
U-5
T-5
R-5
U-6
T-6
R-6
U-7
T-7
R-7
U-8
T-8
R-8
XLAT
SRDT
SENS
VSC0
SQSY
XRST
DQSY
XINT
RPWR
TX
OSCI
VDIOSC
OSCO
DVSS0
DVDD0
VSIOSC
AOUTL
DAVDDL
DAVSSL
VREFL
DAVDDR
DAVSSR
AOUTR
VREFR
VSC1
XTSL
TST1
DIN1
DOUT
VDC1
DAPWMLN
DAPWMLP
VSIO0
DAPWMRP
MTFLGR
MTFLGL
TST7
DATAI
TST0
ADDT
TST8
VDIO0
LRCK
DADT
VDC2
VSC2
XBCK
F256
A02
A04
A03
A06
A01
A05
I
O
O
-
O
I
O
O
I
I
I
-
O
-
-
-
O
-
-
O
-
-
O
O
-
I
I
I
O
-
O
O
-
O
O
O
I
I
O
I
I
-
O
O
-
-
O
O
O
O
O
O
O
O
Micon serial bus latch input
Micon serial bus data read out output
Internal output of micon serial bus address
Internal logic GND
PTGR=0 ADIPsink output / PTGR=1 DISC SUB-Q sink output
Reset input L:reset
Ubit SUB-Q sink output from digital audio input from MD or CD
Request status output L:request status
Laser power select input (H=rec power / L=playback power)
Output permit input of recorded data
X'tal osc circuit input
OSC sel VDD (2.5V)
X'tal osc circuit output
Internal 16bit DRAM GND
Internal 16bit DRAM GND
OSC sel GND
Internal DAC Lch output
Internal DAC VDD (Lch,2.5V)
Internal DAC GND
Internal DAC GND VREF(Lch)
Internal DAC VDD (Rch,2.5V)
Internal DAC GND (Rch)
Internal DAC Rch output
Internal DAC VREF (Rch)
Internal logic GND
X'tal frequency select (L=45.1584MHz/H=22.5792MHz)
Test terminal Connect to GND
Digital audio input Outer I/F mode EXRQ input
Digital audio output
Internal logic VDD (1.8V)
Internal DAC PWM output L-
Internal DAC PWM output L+
2.5V I/O VSS
Internal DAC PWM output R+
Internal DAC zero detect flag (Rch)
Internal DAC zero detect flag (Lch)
Test terminal Connect to GND
Serial data input
Open
Data input from A/D converter
Test terminal Connect to GND
2.5V I/O VDD
LR clock(44.1kHz) for A/D, internal DAC
Data output for internal DAC / Internal DAC PWM output R-
Internal logic VDD (1.8V)
Internal logic GND
A/D, internal DAC bit clock (2.8224MHz)
11.2896MHz clock output (X'tal)
External DRAM address output
External DRAM address output
External DRAM address output
External DRAM address output
External DRAM address output
External DRAM address output
2.Pin function(2)
Pin No.
Symbol I/O Function

XM-PX50WT
1-18
U-9
T-9
R-9
U-10
T-10
R-10
U-11
T-11
R-11
U-12
T-12
R-12
U-13
T-13
R-13
U-14
T-14
R-14
U-17
U-16
U-15
T-17
T-16
T-15
R-17
R-16
R-15
P-17
P-16
P-15
N-17
N-16
N-15
M-17
M-16
M-15
L-17
L-16
L-15
K-17
K-16
K-15
J-17
J-16
J-15
H-17
H-16
H-15
G-17
G-16
G-15
F-17
F-16
F-15
VSIO1
A00
ADIO1
A08
A10
A07
IXOE
XRAS
A09
IXWE
XCAS
D1
D2
D0
VDC3
VSC3
D3
DVDD1
NC
NC
XOE
NC
TST6
A11
DVSS1
XWE
PDO
ASYI
ASYO
MVCI
AVS1
BIAS
AVD1
FILI
PCO
RFI
PEAK
CLTV
FILO
FE
ABCD
BOTOM
ADIO
VC
AUX1
AVS2
ADRT
AVD2
ADRB
SE
TE
ADFG
APC
DCHG
-
O
-
O
O
O
O
O
O
O
O
I/O
I/O
I/O
-
-
I/O
-
-
-
O
-
O
O
-
O
O
I
O
I
-
I
O
I
I
I
O
I
I
I
O
I
I
-
I
-
I
-
I
I
I
I
I
I
2.5V I/O sel Vss
External DRAM address output
2.5V I/O sel VDD
External DRAM address output
External DRAM address output
External DRAM address output
Open
External DRAM RAS output
External DRAM address output
Open
External DRAM CAS output
External DRAM data input/output
External DRAM data input/output
External DRAM data input/output
Internal logic VDD
Internal logic GND
External DRAM data input/output
Internal 16Mbit DRAM VDD
Open
Open
External DRAM output chip enable output
Open
Open
Open
Internal 16Mbit DRAM GND
External DRAM write enable output
Analog PLL phase compare output
Playback EFM comparator slice level input
Playback EFM binarization signal output
Clock input from external VCO
Analog GND
Playback EFM comparator bias current input
Analog power supply (2.5V)
Filter input for playback EFM system mastering PLL
Phase comparison output for playback EFM system mastering PLL
Playback EFM RF signal input
Peak holding input optical amount signal
Internal VCO control voltage input for playback EFM system mastering PLL
Filter output for playback EFN system mastering PLL
Focus error signal input
Optical amount signal input
Bottom holding input of optical amount signal
Open
Middle point voltage input
Assistance A/D input
Analog GND
A/D converter operation range upper bound voltage input
Analog power supply (2.5V)
A/D converter operation range lower bound voltage input
Sled error input
Tracking error input
ADIP binary-coded FM signal input
Error signal input for laser digital APC
Connects with an analog power supply of low impedance
2.Pin function (3)
Pin No.
Symbol I/O Function

XM-PX50WT
1-19
E-17
E-16
E-15
D-17
D-16
D-15
A-17
B-17
C-17
A-16
B-16
C-16
A-15
B-15
C-15
A-14
B-14
C-14
A-13
B-13
C-13
A-12
B-12
C-12
A-11
B-11
C-11
A-10
B-10
C-10
A-9
B-9
C-9
A-8
B-8
C-8
A-7
B-7
C-7
A-6
B-6
C-6
A-5
B-5
C-5
A-4
B-4
C-4
VSIO2
F0CN
VDIO2
DTRF
CKRF
XLRF
NC
NC
LDDR
NC
NC
APCR
TFDR
TRDR
NC
FRDR
FFDR
VDC4
VSC4
SRDR
FS4
SPFD
SPRD
SFRD
TEST2
TEST1
FGIN
TST2
EFMO
TEST3
VSIO3
TST3
VDIO3
SPCU
SPDW
SPDV
TST4
SPCW
SPCV
VSC5
SLDW
SLDV
SLCV
SLCU
VDC5
BYPS
TST5
SLCW
-
O
-
O
O
O
-
-
O
-
-
O
O
O
-
O
O
-
-
O
O
O
O
O
I
I
I
O
O
I
-
O
-
I
O
O
O
I
I
-
O
O
I
I
-
O
O
I/O
2.5V I/O Vss
Filter cutoff control output
2.5V I/O VDD
Controller data output
Controller clock output
Controller latch output
Open
Open
Laser digital APC PWM output
Open
Open
Laser APC reference PWM output
Tracking servo drive PWM output (+)
Tracking servo drive PWM output (-)
Open
Focus servo drive PWM output (-)
Focus servo drive PWM output (+)
Internal logic VDD (1.8V)
Internal logic GND
Sled servo drive PWM output (-)
176.4kHz clock output (X'tal system)
Spindle servo drive output
Spindle servo drive output
Sled servo drive PWM output (+)
Test terminal Connect to GND
Test terminal Connect to GND
Spindle CAV servo FG input
Test terminal Open
EFM output at recording
Test terminal Connect to GND
2.5V I/O Vss
Test terminal Open
2.5V I/O VDD
Blush less spindle motor drive comparate input (U)
Blush less spindle motor 3 phase drive truth output (W)
Blush less spindle motor 3 phase drive truth output (V)
Test terminal Open
Blush less spindle motor drive comparete input (W)
Blush less spindle motor drive comparate input (V)
Internal logic GND
Blush less sled motor 3 phase drive truth output (W)
Blush less sled motor 3 phase drive truth output (V)
Blush less sled motor 3 phase drive comparate input (V)
Blush less sled motor 3 phase drive comparate input (U)
Internal logic VDD (1.8V)
Open
Test terminal Open
Blush less sled motor 3 phase drive comparate input
2.Pin function (4)
Pin No.
Symbol I/O Function

XM-PX50WT
1-20
AK93C55BH-W (IC502) : EEPROM
1
2
3
4
8
7
6
5
CS
SK
DI
DO
VCC
NC
PE
GND
Pin name
CS
SK
DI
DO
PE
VCC
GND
NC
Chip select
Serial data clock
Serial data input
Serial data output
Program enable
Ground
Power supply
Not connected
1. Pin layout
3. Block diagram
2.Pin function
DO
EEPROM
2048bit
128 X 16
16
16 R/W AMPS
AND
AUTO ERASE
DECODER
DATA
REGISTER
ADD.
BUFFER
INSTRUCTION
DECODE,
CONTROL
AND
CLOCK
GENERATION
INSTRUCTION
REGISTER
DI
CS
SK
PE
VREF
VPP SW
VPP
GENERATOR
Fnction
VDD OUT
IN(+) Vss IN(-)
54
123
1.Pin layout/Block diagram
TC75S51F-X(IC505):Ope amp