JVC UX-P3 User manual

1-1
UX-P3
SERVICE MANUAL
MICRO COMPONENT SYSTEM
No.20984
Jun. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
UX-P3
UX-P3
Contents
Safety precautions
Preventing static electricity
Important for laser products
Disassembly method
Main adjustment
Flow of functional operation
until TOC read (CD)
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
Internal connection of display
1-2
1-4
1-6
1-7
1-14
1-18
1-19
1-19
1-20
1-39
Area Suffix
UB
UP
US
UW
UY
Hong Kong
Korea
Singapore
South Africa
Argentina
COMPACT
DIGITALAUDIO
CD TAPE FM/AM
MICRO COMPONENT SYSTEM UX·P3
CD-R/RW PLAYBACK
AUX
TIMER
CLOCK
STANDBY
STANDBY
/
ON
VOLUMEFUNCTION
SOUND
DIRECT OPERATING
AHB PRO
AUTO REVERSE
AUTO TAPE SELECTOR
REC
REV.MODE
PHONES
SLEEP
STANDBY/ON
AUX
FM/AM
TAPE
CD
DISPLAY
REPEATRANDOMPROG
FM MODE
AUTO
PRESET
SOUND
MODE
CD
CANCEL MULTI KEY SET
RM-SUXP3U REMOTE CONTROL
VOLUME
AHB
PRO
/
SP-UXP3 CA-UXP3 SP-UXP3

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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.
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the
parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " "
mark nearby are critical for safety.
When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer.
(Except the J and C version)

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1. Service should be performed by qualified personnel only.
2.This equipment has been designed and manufactured to meet international safety standards.
3. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
4. Repairs must be made in accordance with the relevant safety standards.
5. It is essential that safety critical components are replaced by approved parts.
6. If mains voltage selector is provided, check setting for local voltage.
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.
2. Any unauthorised design alterations or additions will void the manufacturer's guarantee ; furthermore the
manufacturer cannot accept responsibility for personal injury or property damage resulting therefrom.
3. Essential safety critical components are identified by ( ) on the Parts List and by shading on the
schematics, and must never be replaced by parts other than those listed in the manual. Please note
however that many electrical and mechanical parts in the product have special safety related
characteristics. These characteristics are often not evident from visual inspection. Parts other than
specified by the manufacturer may not have the same safety characteristics as the recommended
replacement parts shown in the Parts List of the Service Manual and 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.
!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.
(U.K only)

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Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc.is discharged,
can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
1.1. Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.
1.1.1. Ground the workbench
1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over
it before placing the traverse unit (optical pickup) on it.
1.1.2. Ground yourself
1. Use an anti-static wrist strap to release any static electricity built up in your body.
1.1.3. Handling the optical pickup
1. In order to maintain quality during transport and before installation, both sides of the laser diode on the
replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
2. Do not use a tester to check the condition of the laser diode in the optical pickup.The tester's internal power
source can easily destroy the laser diode.
1.2. Handling the traverse unit (optical pickup)
1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific
details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse
unit.Be careful not to take too long a time when attaching it to the connector.
3. Handle the flexible cable carefully as it may break when subjected to strong force.
4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap

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1.3. Cautions on removing the CD traverse unit
* For removing the CD traverse unit in detail, refer to the "Adjustment Method" section of this manual.
1. Before disconnecting the flexible wire from the connector CN601 on the CD SERVO board, solder the part shown in
the figure below.
(Note:If the flexible wire is disconnected from the CN601 without presoldering, it may cause breakdown of the CD
pickup assembly.)
2. When reassembling the CD traverse unit, be sure to remove the solder from the soldered part after reconnecting the
flexible wire to the CN601.
CD SERVO board CD SERVO board
Soldering part
CN601
CN601
C601
C602 C603 C604
C605 C606
C607
C610
C611
C612
C613
C614
C615
C616
C617
C619 C620
C621
C622
C623
C624
C631
C632
C633
C641 C642
C643
B619
C651 C652
C653
C654
C655
C656
C657
C658
C661
C663
C664 C665
C667 C668
C669
C670
C671
C672
C673
C676
C677
C679
C680
C691
C692
C693
C694
C695
C696
C699
C801
C802
C811
C812
C813
C814
C815
C821 C822
C823
C824
C831
C832
C833
CN601
CN651 CN652
CN801
D831
R648
IC652
IC801
IC802
L831
Q631
Q801
R601
R602
R603 R604
R605 R606 R610 R611
R612 R613 R617
R618 R619
R620
R621
R631
R632
R634 R635
R636
R641 R642 R643
R647
R651 R652
R653
R654
R655 R656
R657 R658 R659
R661
R662
R663 R664
R665
R666
R667
R668
R669
R670
R682
R683
R685
R691
R692
R695 R696
R701
R702
R703
R704
R705
R706
R707
R708
R709
R710
R801 R802
R803 R804
R805 R806
R807 R808 R809
R812
R821
R822
R823
R824
R831
W605
CN606
X651
B604
B616
B614
R813
C816
B613
B615
B610
B612
B617
B618
IC601
R607
B601
B603
B602
B611
B609
B608
B607 B606
B605
D601
D602
R681
C681
R684
MUTE
FLAG
CDDG
BLKCK
/REST
MLD
MDATA
MCLK
CDDG
SUBQ
SQCK
/RST
STAT
FM+
REST
SM-
SM+
D.GND
FM-
1
1
1
1
1
BE
BE
C
31
6
ARF
A.GND
F- T- T+ F+ GND VR LD MD T2 K F1 NC T1 SR F2
115
T02
SCD
SCD
CDDG
13
LM+
OPSW
GND
CLSW
LM-
M.GND
SW10
SW10
CLOSE
OPEN
OPSW
CLSE
CD+B
CD+B
CDL
A.GND
A.GND
CDR
51
116
1
21
41
61
17
16
32
12
24
13

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

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Remove the six screws Aon the back of the body.
Remove the two screws Bon the side of the body.
Pull both sides of the metal cover outward and lift the
rear part of the cover.
1.
2.
3.
Disassembly method
<Main body>
Removing the metal cover
(See Fig.1 and 2)
Prior to performing the following procedure, remove
the metal cover.
Remove the two screws Con the back of the body.
1.
Removing the rear cover (See Fig.3)
Fig.1
Fig.2
Fig.3
A
A
A
A
A
Metal cover
Metal cover
B 2
C
Rear cover
Rear panel
C

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Prior to performing the following procedure, remove
the metal cover.
Disconnect the card wire from connector CN1 on the
tuner board.
Remove the screw Don the right side of the body.
Remove the two screws Eon the rear panel.
1.
2.
3.
Removing the tuner board
(See Fig.4 and 5)
Prior to performing the following procedure, remove
the metal cover and the rear cover.
Disconnect the card wires from connector CN903,
CN904 on the main board on the upper side of the
body.
Remove the screw Dattaching the tuner board and
the CD mechanism on the right side of the body.
Remove the two screws F attaching the rear panel
and the CD mechanism on the back of the body.
Move the rear part of the CD mechanism assembly
upwards to disengage the two joints aand release
from the rear panel.
Pull the front panel toward the front and move the
rear part of the CD mechanism assembly upwards.
Then pull out the CD mechanism assembly from the
front panel backward.
1.
2.
3.
4.
Removing the CD mechanism assembly
(See Fig.6 to 8)
To remove the CD mechanism assembly
efficiently, disconnect the card
wireconnecting the tuner board with the
main board in advance.
REFERENCE:
Fig.4
Fig.5
Fig.6
Fig.7
D
CN1
Tuner board
E
Rear cover
Rear panel
Rear panel
Tuner board
Card wires
CD mechanism assembly
Front panel assembly
CN903
Main board
CN904
CD mechanism assembly Tuner board
D
Front panel assembly

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Prior to performing the following procedure, remove
the metal cover, rear cover and the CD mechanism
assembly.
Remove the five screws Gattaching the rear panel.
Disconnect the card wire from CN902 on the main
board.
Disengage the lower two joints bon each side of the
rear panel using a screwdriver and remove the rear
panel backward (The tuner board and the fan will be
also detached.Remove them as needed).
1.
2.
3.
Remove the rear panel (See Fig.8 to 11)
Prior to performing the following procedure, remove
the metal cover, the rear cover andthe CD
mechanism assembly.
Disconnect the wire from connector CN908 on the
main board.
Remove the two screws Hon the back of the body.
Move the fan upwards to disengage the four joints c
and release from the rear panel.
1.
2.
3.
Removing the fan (See Fig.9 and 12)
Fig.8
Fig.10
Fig.11Fig.12
F
G
G
Rear panel
Joint a
Joint a
Joint b
Rear panel
Rear panel
Joint b
Fan
Rear panel
HH
Joint c
Joint c
Joint c
Joint c
G
Main board
CN908
CN902 Fan Rear panel
Tuner board
Fig.9

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Prior to performing the following procedure, remove
the metal cover, the rear cover, the CD mechanism
assembly and the rear panel.
Disconnect the card wire from connector CN900,
CN901 and CN931 on the main board.
Disconnect the wire from CN906 and FW903
respectively.
Disconnect the wire from W950 on the underside of
the main board.
Remove the two screws Iattaching the main board
to the chassis on the left side ofthe body and
disengage the two joints c.
Remove the two screws J attaching the heat sink to
the main board.
1.
2.
3.
4.
Removing the main board / heat sink
(See Fig.13 to 15)
Fig.14
Fig.13
Fig.15
Front panel assembly
Main board
II
Joints c
Heat sink
Main board
CN931
CN901
CN900
CN906
FW906
Main board
J

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Prior to performing the following procedure, remove
the metal cover, the rear cover, the CD mechanism
assembly and the rear panel.
Remove the cord stopper upwards on the back of the
body.
Disconnect the power cord from connector J1000 on
the board of the power transformer assembly.
Disconnect the wire from connector FW903 on the
main board.
Remove the four screws Kattaching the power
transformer assembly.
1.
2.
3.
4.
Removing the power transformer
assembly (See Fig.16 and 17)
Prior to performing the following procedure, remove
the metal cover, the rear cover, the CD mechanism
assembly and the rear panel.
Disconnect the card wire from connector CN900,
CN901 and CN931 on the main board (Refer to
Fig.13).
Disconnect the wire from CN906 and FW903
respectively (Refer to Fig.13).
Disconnect the wire from W950 on the underside of
the main board.
Remove the two screws L on each lower side of the
body.
Release the lower joints don each side of the body
using a screwdriver. Pull out thefront panel assembly
toward the front.
1.
2.
3.
4.
Removing the front panel assembly
(See Fig.13, 18 and 19)
Fig.16
Fig.17
Fig.18Fig.19
J1000
Cord stopper
Power cord
Power transformer
assembly
J1000
Main board
FW903
K
K
Joint d
Joint d
Front panel assembly
Front panel assembly
L
L
Power transformer
assembly
Power transformer
assembly
Main board
FW931 Main board

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Prior to performing the following procedure, remove
the front panel assembly.
Pull out the VOLUME knob on the front panel.
Remove the fifteen screws Mattaching the display
board and the switch board on the back ofthe front
panel. Remove the display board with the switch
board.
Remove the screw N attaching the switch board to
the LCD holder.
If necessary, unsolder the wire extending from
connector FW931 on the display board and FW931
on the switch board.
If necessary, remove the band bundling the wires
extending from the headphone board and the display
board.
1.
2.
3.
4.
5.
Removing the display board / switch
board (See Fig.20 to 22)
Front panel assembly
VOLUME knob
Display board
Switch board
MM
M
M
MM
M
Band
Switch board
Display board
FW931 N
Fig.20
Fig.21
Fig.22

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Prior to performing the following procedure, remove
the front panel assembly.
Remove the screw Oon the back of the front panel.
If necessary, remove the band bundling the wire
extending from the headphone board and the display
board.
1.
2.
Removing the headphone board
(See Fig.23)
Prior to performing the following procedure, remove
the front panel assembly.
Press the EJCT button on the front panel to open the
cassette door.
Remove the four screws Pon the back of the front
panel.
1.
2.
Removing the cassette mechanism
assembly (See Fig.23 and 24) Fig.23
Fig.24
Display board
P
Band
O
Headphone board
Cassette mechanism assembly
P
Front panel assembly
Cassette door
EJCT button
P

1-14
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Main adjustment
Measurement Instruments Required for
Adjustment
1. Low frequency oscillator
This oscillator should have a capacity to output
0dBs to 600 at an oscillation frequency of
50Hz-20kHz.
2. Attenuator impedance : 600
3. Electronic voltmeter
4. Distortion meter
5. Frequency counter
6.Wow & flutter meter
7.Test tape
VTT703L : Head azimuth
VT712 :Tape speed and running unevenness
(3kHz)
VT724 : Reference level (1kHz)
8. Blank tape
TYPE : AC-225
TYPE : AC-514
9.Torque gauge : For play and back tension
FWD(TW2111A), REV(TW2121a) and
FF/REW(TW2231A)
10.Test disc: CTS-1000
Radio Input signal
AM frequency --------------------------------------- 400Hz
AM modulation ---------------------------------------- 30%
FM frequency --------------------------------------- 400Hz
FM frequency deviation ------------------------ 22.5kHz
Tuner section
B/E/EN version
FM Band cover: 87.5 108MHz
MW Band cover: 522 1,629kHz
LW Band cover: 144 288kHz
EE version
FM Band cover: 65 74MHz, 87.5 108MHz
MW Band cover: 522 1,629kHz
LW Band cover: 144 288kHz
UB/UF/US/UX/U version
FM Band cover: 87.5 108MHz
MW Band cover: 531 1,602kHz, 530 1,710kHz
SW Band cover: SW1 2.3 6.995MHz
: SW2 7 21.85MHz
Voltage applied to tuner +B : DC5.7V
VT : DC 12V
Reference measurement
output 26.1mV(0.28V)/3
Input positions AM : Standard loop antenna
FM :TP1 (hot) and TP2 (GND)
Standard measurement position of volume
Function switch to Tape
Beat cut switch to Cut
Super Bass/Active hyper Bass to OFF
Bass Treble to Center
Adjustment of main volume to reference output
VOL : 28
Precautions for measurement
1. Apply 30pF and 33k to the IF sweeper output
side and 0.082 F and 100k in series to the
sweeper input side.
2.The IF sweeper output level should be made as
low as possible within the adjustable range.
3. Since the IF sweeper is a fixed device, there is no
need to adjust this sweeper.
4. Since a ceramic oscillator is used, there is no need
to perform any MIX adjustment.
5. Since a fixed coil is used, there is no need to adjust
the FM tracking.
6.The input and output earth systems are separated.
In case of simultaneously measuring the voltage in
both of the input and output systems with an
electronic voltmeter for two channels, therefore, the
earth should be connected particularly carefully.
7. In the case of BTL connection amp., the minus
terminal of speaker is not for earthing.Therefore, be
sure not to connect any other earth terminal to this
terminal.This system is of an BTL system.
8. For connecting a dummy resistor when measuring
the output, use the wire with a greater code size.
9.Whenever any mixed tape is used, use the band
pass filter (DV-12).
Measurement conditions
Power supply voltage
: AC230V (50Hz)----B/E/EE/EN
: AC110/127V/230V(50/60Hz)
: UB/UF/US/UX/U
Reference output : Speaker : 0.775V/4
: Headphone : 0.077V/32
Reference frequency and
input level ------------------------------ 1kHz, AUX : -8dBs
MIX MIC: -54dBs (UB/UF/US/UX/U)
Input for confirming recording and playback
characteristics ------------------------- AUX : -28dBs
Measurement output terminal ------- at Speaker J3002
Load resistance --------------------------- 4

1-15
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<<Arrangement of Adjusting Position>>
Cassette mechanism section Cassette mechanism section (Back side)
Head azimuth
adjusting screw
(Reverse side)
Head azimuth
adjusting screw
(Forward side)
Playback/Recording &
eraser head
Head azimuth
adjusting screw
(Forward side)
Head azimuth
adjusting screw
(Reverse side)
C202
C376
C103
C121
C106
C305
C108
C109
C107
C308
R203
C302
C203
R109
C206
R104
C209
C113
R209
C207
C301
C310
C303
C304
C208
C331
C313
R116
R204
C316
B106
C319
R103
C375
61
CN31
B158
70u FRE PLA PHO 5V MG SOL RRE TAP NC
110
CN32
91IC31
8 9
IC32
1
16
16
18
9IC33
L301
Q101
Q201
Q305
Q302
B168
C334
B
Q375
E
Q376
Q371 B
E
C201
R101
R102 C104
R105
R106
R107
R108
C221
R110 R111
R112
R121
R201
R202
C204
R205
R206
R207
R208
C111
R210
R211
R212
R221
R301
R303
R304
B167
R335
R315 R314
R313
R310
R122
Q103
R305
B151
R371
R375
R376
R372
R338 R337
R341
R342
R343
R339
R336
R331
VR31 VR37
C210
C110 C102 C101
Q372
C213
C211
R215
D375
R115
R340
Q331
B113
R345
9
CN33
1
1
CN34
MS
MB
PBR
AG
PBL
SW8V
RECR
AG
RECL
MG
10
R327
C306
R216
C371
B153
B152
B162
C374
R222
B102
B200
B101
Q203
B110
B109B108
B164
B161
B163
R353
B155
C317
C314
L303
R373
B157
B159
B156
B160
B112
C307
B166
Q321
B198 C105
C205
C332 C333
MOTOR SPEED
VR37
BIAS ADJ
VR31
Cassette AMP board

1-16
UX-P3
Tape Recorder Section
ReferenceValues for Confirmation Items
Items
Items
Measurement
conditions
Measurement
conditions
Measurement method
Measurement method
Standard
Values
Standard
Values
Adjusting
positions
Adjusting
positions
Confirmation
of head angle
Confirmation
of tape speed
Test tape
:VTT703L (8kHz)
Measurement output
terminal
: Speaker terminal
Speaker R
(Load resistance: 4 )
: Headphone terminal
1 Playback the test tape VTT703L (8kHz)
2 With the recording & playback mechanism,
adjust the head azimuth screw so that the
forward and reverse output levels become
maximum.After adjustment, lock the head
azimuth at least by half turn.
3 In either case, this adjustment should be
performed in both the forward and reverse
directions with the head azimuth screw.
Maximum
output
Tape speed
of deck
: 2,940 ~
3,090Hz
Adjust the head
azimuth screw
only when the
head has been
changed.
Test tape
:VT712 (3kHz)
Measurement output
terminal
: Headphone terminal
When the test tape VT712 (3kHz) has been
played back with the recording and playback
mechanism at the beginning of forward
winding, the frequency counter reading of the
difference between both of the mechanism
should be 6.0Hz or less.
Adjust VR37 so that the frequency counter
reading becomes 2,940~3,090Hz when
playing back the test tape VT712 (3kHz) with
playback and recording mechanism after
ending forward winding of the tape.
VR37
Difference
between the
forward and
reverse speed
Test tape
:VT712 (3kHz)
Measurement output
terminal
: Speaker terminal
Speaker R
(Load resistance: 4 )
Measurement output
terminal
: Headphone
6.0Hz or
less Head azimuth screw
Wow & flutter Test tape
:VT712 (3kHz)
Measurement output
terminal
: Headphone terminal
When the test tape VT712 (3kHz) has been
played back with the recording and playback
mechanism at the beginning of forward
winding, the frequency counter reading of
wow & flutter should be 0.25% or less
(WRMS).
0.25% or
less
(WRMS)

1-17
UX-P3
Electrical Performance
ReferenceValues for Electrical Function Confirmation Items
Items
Items
Measurement
conditions
Measurement
conditions
Measurement method
Measurement method
Standard
Values
Standard
Values
Adjusting
positions
Adjusting
positions
Adjustment of
recording and
playback
frequency
characteristics
Adjustment of
recording bias
current
(Reference
Value)
Reference frequency
: 1kHz and 10kHz
(REF.: -20dB)
Test tape
: AC-514 to TYPE
Measurement input
terminal
: OSC IN
Mode: Forward or
reverse mode
Recording mode
Test tape
: AC-514 to TYPE
and AC-225 to
TYPE
Measurement output
terminal
: Both recording and
headphone terminals
1 With the recording and playback
mechanism, load the test tapes (AC-514 to
TYPE and AC-225 to TYPE ), and set
the mechanism to the recording and
pausing condition in advance.
2 After connecting 100 in series to the
recorder head, measure the bias current
with a valve voltmeter at both of the
terminals.
3 After resetting the [PAUSE] mode, start
recording. At this time, adjustVR31 for Lch
and VR32 for Rch so that the recording
bias current values become 4.0 A (TYPE
) and 4.20 A (TYPE ).
1 With the recording and playback
mechanism, load the test tapes (AC-514 to
TYPE ), and set the mechanism to the
recording and pausing condition in
advance.
2 While repetitively inputting the reference
frequency signal of 1kHz and 10kHz from
OSC IN, record and playback the rape.
3 While recording and playback the test tape
in TYPE , adjustVR31 for Lch and VR32
for Rch so that the output deviation
between 1kHz and 10kHz becomes
-1dB 2dB.
1 While recording and playback mechanism,
load the test tapes (AC-514 to TYPE
and AC-225 to TYPE ), and set the
mechanism to the recording and pausing
conditions in advance.
2 After setting to the recording conditions,
connect 1W in series to the eraser head on
the recording and playback mechanism
side, and measure the eraser current from
both of the eraser terminals.
1 While changing over to and from BIAS 1
and 2, confirm that the frequency is
changed.
2 With the recording and playback
mechanism, load the test tape.
(AC-514 to TYPE ), and set the
mechanism to the recording and pausing
condition in advance.
3 Confirm that the BIASTP frequency on the
P.C. board is 100kHz 6kHz.
Recording
bias
frequency
Forward or reverse
Test tape
:TYPE (AC-514)
Measurement
terminal : BIAS TP on
P.C. board
100 kHz
6 kHz
Eraser
current
(Reference
value)
Forward or reverse
Recording mode
Test tape
: AC-514 to TYPE
and AC-225 to
TYPE
Measurement
terminal : Both of the
eraser head terminals
TYPE
: 120 mA
TYPE
: 75 mA
AC-225
: 4.20 A
AC-514
: 4.0 A
VR31
Output
deviation
between
1kHz and
10kHz
: -1dB 2dB
VR31

1-18
UX-P3
Flow of functional operation until TOC read (CD)
Slider turns REST
SW ON.
Automatic tuning
of TE offset
Laser ON
Detection of disc
Automatic measurement of
Focus A-curve amplitude
Automatic tuning of
Foucus offset
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic tuning of
Tracking error balance
Automatic measurement of
Tracking error amplitude
Automatic tuning of
Focus error balance
Disc to be
braked to stop
Tracking
servo
on statas
Tracking
servo
off statas
Disc statas
to rotate TOC reading
finishes
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance 500mv/div
2ms/div Fig.1
Approx.3sec
pin 20 of
IC601(TE)
Approx
1.8V
VREF
Tracking error waveform at TOC reading
Power ON Power Key
Confirm that the Focus error
S-cuve siganl at the pin23 of
IC601 is approx.2Vp-p
Confirm that the siganl from
pin22 IC603 is 0V as a
accelerated pulse during
approx.400ms.
Confirm the waveform of
the Tracking error signal
at the pin20 of IC601
(See fig-1)
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
Confirm the eys-pattern
at the lead of TP1
Check that the voltage at the pin4
of CN601 is 0V (a moment)?
Check Point
Check that the voltage at the
pin2 of IC601 is 0V?

1-19
UX-P3
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
Befor you replace the pick up, please try to
clean the lens with a alcohol soaked cotton
swab.
(2) Life of the laser diode (Fig.1)
When the life of the laser diode has expired,
the following symptoms wil appear.
(1) The level of RF output (EFM output:ampli
tude of eye pattern) will below.
Is RF output
1.1 0.15Vp-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.
(Fig.1)
Replacement of laser pickup

1-20
UX-P3
1. Pin layout 80 ~ 65
25 ~ 40
1
24
~
64
41
~
2. Pin function
UPD780058 (IC931 ) : Main micon
Pin
No. Port Name I/O Function 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
P15/AN15
P16/AN16
P17/AN17
AVss
P130/ANO0
P131/ANO1
AVREF1
P70/SI2/RxD0
P71/SO2/TxD0
P72/SCK2/ASCK
P20/SI1
P21/SO1
P22/SCK1
P23/STB/TxD1
P24/BUSY/RxD1
P25/SI0/SB0
P26/SO0/SB1
P27/SCK0
P40/AD0
P41/AD1
P42/AD2
P43/AD3
P44/AD4
P45/AD5
P46/AD6
P47/AD7
P50/A8
P51/A9
P52/A10
P53/A11
P54/A12
P55/A13
Vss1
P56/A14
P57/A15
P60
P61
P62
SAFETY0
DOOR_RST
CDSAFETY
EQSW
GCTRL
QRIN
SQCK
STAT
MDATA
MCLK
_XRST
MLD
MUTE
SDATA
SCK
CLOSE
OPEN
F_CD
_AHB1
VOLCE
_F_AUX
_PBMUTE
_SMUTE
SPKMUTE
_AHB
P_OUT
PROTR
MODEL1
MODEL2
I
I
I
O
O
I
O
I
O
O
O
O
O
O
O
I
I
O
O
O
O
O
O
O
O
O
I
I
Irregular voltage detection 0
REST/CLOSE switch detect port
CD safety voltage detect port
CD speed control
CD Gain Control
Q-code data input port
Q-code serial clock
CD status input port
CD data input port
CD data clock
CD reset
CD command ready signal
BTL mute control port
Serial Date (Tuner PLL/Tape IC)
Serial Clock (Tuner PLL/Tape IC)
Door close switch input port
Door poen switch input port
CD Function ("H"=CD)
Subwooder Amp AHB control
Volumn Chip Enable
Tape play mute ("L"=mute)
System mute
Speaker mute
Active Hyper Bass On/off ("L"=ON)
Power On/off ("H"=Power On)
Protector
MODEL 0: P3/P5; 1: P7
MODEL2 0: P3; 1: P5
Safety
Door
Safety
CD
CD
CD
CD
CD
CD
CD
CD
CD
CD
Tuner/Tape
Tuner/Tape
Door
Door
CD
Sound (P7only)
Sound
AUX
Tape
Sound
Sound
Sound
AMP
Safety
Description of major ICs