JVC UX-H300 User manual

SERVICE MANUAL
COPYRIGHT © 2004 Victor Company of Japan, Limited No.MB297
2004/7
MICRO COMPONENT SYSTEM
MB29720047
UX-H300,UX-H330,UX-H350
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Area suffix
US ------------------------ Singapore
UT ---------------------------- Taiwan
UW ----------- Brazil,Mexico,Peru
UX-H300
Area suffix
UJ ---------------------- U.S.Military
UX-H350
Area suffix
UT ---------------------------- Taiwan
UW ----------- Brazil,Mexico,Peru
UX-H330

1-2 (No.MB297)
SPECIFICATION
Design and specifications are subject to change without notice.
Amplifier Section Output Power 15 W per channel, min. RMS, driven into 4 Ωat 1 kHz with no more
than 10% total harmonic distortion. (IEC268-3)
Audio input sensitivity/Impedance (at 1 kHz) AUX:500 mV/50 kΩ
Speakers/Impedance 4 Ω- 16 Ω
Tuner FM tuning range 100 kHz intervals 87.5 MHz-108.0 MHz
50 kHz intervals 87.50 MHz-108.00 MHz
AM tuning range 10 kHz intervals 530 kHz-1 710 kHz
9 kHz intervals 531 kHz-1 710 kHz
CD player Dynamic range 85 dB
Signal-to-noise ratio 85 dB
Wow and flutter Immeasurable
Cassette deck Frequency response Normal (type I) 100 Hz-10 000 Hz
Wow and flutter 0.35% (WRMS)
General Power requirement AC 110 V-127 V / AC 220 V- 240 V (adjustable with the voltage se-
lector), 50 Hz / 60Hz
Power consumption 2 W (on standby) 40 W (at operation)
Dimensions (W/H/D) (approx.) 152 mm ×233 mm ×292 mm
Mass (approx.) 3.9 kg
Speaker Section Type Full range, bass-reflex type
Speakers 10 cm cone ×1
Power handling capacity 15 W
Impedance 4 Ω
Frequency range 100 Hz-15 kHz
Dimensions (W/H/D) (approx.) 147 mm ×233 mm ×189 mm
Mass (approx.) 1.9 kg each

(No.MB297)1-3
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. 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 per-
formed 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 manufacturers 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 characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice 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 charac-
teristics 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 reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna 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, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent 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, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W resistor
paralleled by a 0.15µF AC-type capacitor between an ex-
posed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure 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.).
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that
these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant
safety standards.
(4) It is essential that safety critical components are replaced
by approved parts.
(5) If mains voltage selector is provided, check setting for local
voltage.
1.3 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 pre-
forming repair of this system.
1.4 Critical parts for safety
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.
(This regulation dose not Except the J and C version)
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

1-4 (No.MB297)
1.5 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.
1.5.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
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.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• 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.)
• 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.
1.6 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.7 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible
wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
Short-circuit point
CD pickup board

(No.MB297)1-5
1.8 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 CD,MD and DVD player uses invisible
laser radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open and
the safety interlocks have failed or are defeated. 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 here in may result in
hazardous radiation exposure.
REPRODUCTION AND POSITION OF LABELS
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CLASS 1
LASER PRODUCT
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
WARNING LABEL

1-6 (No.MB297)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB297)1-7
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the front panel assembly
(See Fig.1 to 6)
(1) From the back of the body, remove the two screws A, and
the two screws Battaching the front panel assembly.
(2) Remove the six screws Don both sides of the body.
(3) Remove the screw Eon the bottom of the body.
(4) Move the front panel assembly in the direction of the arrow
and remove. Disconnect connector CN402, CN801 on the
main board and disconnect the wire from FM-ANT.
Caution:
When reassembling the front panel assembly, fit the right and
left tabs a to the notch.
Fig.1
Fig.2
Fig.3
CD mechanism assembly
Rear cover assembly
B
A
Front panelh assembly
CD mechanism assembly
Rear cover assembly
D
Front panelh assembly
CD mechanism assembly
Rear panel assembly
D

1-8 (No.MB297)
Fig.4
Fig.5
Fig.6
Front panel assembly
Rear panel assembly
E
CD mechanism assembly
Front panel assembly
Rear cover assembly
Joint a
CD mechanism assembly
Front panel assembly
Main board
Rear cover assembly
FM-ANT
CN402
CN801

(No.MB297)1-9
3.1.2 Removing the main board
(See Fig.7, 8)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Disconnect the wire from all connectors on the main board.
(2) Disconnect the wire from the two connectors on the cas-
sette mechanism assembly.
(3) Release the three bands attaching the wire to the main
board.
(4) Remove the two screws Ffrom the front panel assembly.
Release the joint b.
Fig.7
Fig.8
CD mechanism assembly
CD mechanism assembly
Front panel assembly
CN203
Main board
CN303
CN602
CN301
CN401
CN603
CN103
Main board
band
CD mechanism assembly
Front panel assembly
b
F

1-10 (No.MB297)
3.1.3 Removing the CD mechanism assembly
(See Fig.9, 10)
• Prior to performing the following procedure, remove the front
panel assembly and the main board.
(1) Release the four bands setting the wire.
(2) Disconnect the wire from the connector on the CD door
switch and from CN601, CN603 and CN604 on the CD
mechanism board respectively.
(3) Remove the three screws Gattaching the CD mechanism
assembly.
(4) Release the joint dto remove the CD mechanism assem-
bly from the front panel assembly.
Fig.9
Fig.10
CD mechanism assembly
CD door switch
CD mechanism board
Front panel assembly
CN604
CN603
CN601
Band
Band
Band
G
G
G
CD mechanism assembly
Front panel assembly
Joint d
Joint d

(No.MB297)1-11
3.1.4 Removing the CD mechanism assembly
(See Fig.11 to 13)
• Prior to performing the following procedure, remove the front
panel assembly, the main board and the CD mechanism as-
sembly.
Caution:
Before disconnecting the card wire from connector CN607 on
the CD mechanism board and from CD pickup board, solder
the short-circuit point on the CD pickup board. If you do not fol-
low this instruction, the pickup may be damaged.
(1) Remove the four screws Hattaching the CD mechanism
board.
(2) Move the CD mechanism board temporarily and discon-
nect the wire from connector CN606.
(3) Solder the short-circuit point on the CD pickup board.
(4) Disconnect the card wire from connector CN607 on the CD
mechanism board.
Caution:
Make sure to unsolder the short-circuit point after reconnecting
the card wire to the CD pickup board and to connector CN607
on the CD mechanism board.
Fig.11
Fig.12
Fig.13
CD mechanism assembly
CD mechanism board
CN606
CN607
H
H
CD mechanism assembly
CD mechanism board
Card wire
CN606
CN607
Short-circuit point
Unsolder
Short-circuit point
CD pickupz board

1-12 (No.MB297)
3.1.5 Removing the CD mechanism
(See Fig.14)
• Prior to performing the following procedure, remove the front
panel assembly, the main board, the CD mechanism assembly
and the CD mechanism board.
(1) Remove the four screws Jattaching the CD mechanism.
Fig.14
3.1.6 Removing the headphone board/ AUX board
(See Fig.15)
• Prior to performing the following procedure, remove the front
panel assembly, the main board and the CD mechanism as-
sembly.
(1) Remove the screw Kattaching the bracket and detach the
headphone board.
(2) Remove the screw Mattaching the bracket and detach the
AUX board.
Fig.15
CD mechanism assembly
CD mechanism
J
J
Front panel assembly
A
UX board Head phones board
Bracket
MK

(No.MB297)1-13
3.1.7 Remove the LCD board
(See Fig.16, 17)
• Prior to performing the following procedure, remove the front
panel assembly, the main board and the CD mechanism as-
sembly.
(1) From the front panel, pull out the volume knob and remove
the nut and the washer.
(2) Remove the twelve screws Nattaching the LCD board.
Fig.16
Fig.17
Front panel assembly
Washer
Volume konb
Nat
Front panel assembly
LCD board
N
N
NN

1-14 (No.MB297)
3.1.8 Removing the cassette mechanism assembly
(See Fig.18, 19)
• Prior to performing the following procedure, remove the front
panel assembly and the main board.
(1) Push ‘PUSH OPEN’ on the front panel to open the cassette
door.
(2) Remove the screw Pattaching the bracket of the cassette
mechanism assembly.
(3) Remove the two screws Qand the two screws Rattaching
the cassette mechanism assembly.
Fig.18
Fig.19
Front panel assembly
Cassette door
PUSH OPEN
Cassette mechaanism assembly
Front panel assembly
Bracket QQ
RR
P

(No.MB297)1-15
3.1.9 Removing the heat sink/power board
(See Fig.20 to 27)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) From the bottom of the rear cover, peel off the tape attach-
ing the wire extending from the power board and remove
the earth plate which is attached with the double-sided
tape.
(2) Remove the four screws Tattaching the holder in the pow-
er unit section.
(3) Move the power unit section with the wire from the rear cov-
er temporarily. If necessary, release the band and unsolder
the wire on the power board.
(4) Remove the four screws Uand the screw Yattaching the
holder.
(5) Release the wire from the band at ‘e’ and move the holder
in the direction of the arrow to release from the joint f.
(6) Remove the four screws A’ and two screws B’ attaching
the heat sink.
(7) Remove the two screws D’ attaching the power board.
Fig.20
Fig.21
Fig.22
Rear cover
Power unit section
Wire
Tape earth plate
Rear cover
TT
T
T
Power trnsfomer assembly
Power unit section
Rear cover
Ppwer unit section

1-16 (No.MB297)
Fig.23
Fig.24
Fig.25
Fig.26
Fig.27
Holder
U
U
Power board Band
Heat sink
Holder
Y
Power board
Power board
Band
Band
e
Band
Heat sink
Unsolder
Unsolder
Unsolder
Joint f
A'
B'
Heat sink
Power board
A'
A'
Heat sink
Power board
D'
Bracket
Power board

(No.MB297)1-17
3.1.10 Removing the power transformer assembly/voltage selector
(See Fig.28, 29)
• Prior to performing the following procedure, remove the front
panel assembly and the power unit section.
(1) Remove the four screws E’ attaching the power transform-
er assembly. The bracket comes off at the bottom of the
rear cover.
(2) Remove the screw F’ attaching the power cord.
(3) From the back of the rear cover, remove the two screws H’
attaching the voltage selector.
3.1.11 Removing the FM antenna board
(See Fig.29)
• Prior to performing the following procedure, remove the front
panel assembly and the power unit section.
(1) From the rear cover assembly, remove the screw G’ at-
taching the FM antenna board.
(2) From the FM antenna board, unsolder the FM antenna
wire.
Fig.28
Fig.29
Rear cove
r
E'
E'
Power trnsfomer assembly
Rear cover
FM antenna board
F'
G'
Power cord

1-18 (No.MB297)
SECTION 4
ADJUSTMENT
4.1 Measurement Instruments Required for Adjustment
(1) Low frequency oscillator
This oscillator should have a capacity to output 0dBs to 600Ωat an oscillation frequency of 50Hz-20kHz.
(2) Attenuator impedance : 600Ω
(3) Electronic voltmeter
(4) Distortion meter
(5) Frequency counter
(6) Wow & flutter meter
(7) Test tape
VT703L : Head azimuth
VT712 : Tape speed and running unevenness (3kHz)
VT724 : Reference level (1kHz)
(8) Blank tape
TYPE l : AC-225
TYPE ll : AC-514
(9) Torque gauge : For play and back tension
FWD(TW2111A), REV(TW2121a) and FF/REW(TW2231A)
(10) Test disc: CTS-1000
4.2 Measurement conditons
4.3 Radio Input signal
Power supply voltage :AC230V ~ AC240V, 50Hz / 60Hz
Reference output :Speaker : 0 dB (2V)/4Ω
:Headphone : -10 dB(0.245V)/32Ω
Reference frequency and input level :1kHz, AUX : -8dBs
Measurement output terminal :at Speaker
Load resistance :4Ω
AM frequency :1kHz
AM modulation :30%
FM frequency :1k
FM frequency deviation :22.5kHz

(No.MB297)1-19
4.4 Cassette amplifier section
4.5 Tuner section
4.6 Location of adjusting parts
Item Measuring condition Check and adjustment procedure Standard value Adjusting part
Head azimuth
adjustment
Test tape:VT703L
Signal output
terminal:PHONES
(with 32 ohm load)
1.Play back the test tape VT703L.
2.Adjust the head azimuth adjusting screw so that
the phase difference between the L and R
channels is minimized at an output level that is
within +/- 2 dB of the maxmum ooutput level.
After this adjustment, lock the kead azimuth
adjusting screw with screw sealant to cover more
than a half of the screw head.
When the head azimuth is maladjusted, correct it
with the head azimuth adjusting screw.
3.
Output level:
Within +/-2 dB of
maximum output
level
Phase difference
L and R
channels:Minimum
Head azimuth
adjusting
screw (to be
used only
after head
replacement)
Tape speed and
wow / flutter check
and adjustment
Test tape:VT712
Signal output
terminal:PHONES
(with 32 ohm load)
1.Playback the test tape VT712 by the end position.
Connect a frequency counter and check that it
reads between 2940 and 3090 Hz. If not, adjust
the frequency with the motor semifixed resistor.
Check that the wow/flutter is within 0.38%
(unweighted)
2.
3.
2940 to 3090 Hz
within 0.38 %
(unweighted)
Tape speed:
Motor semifixed
resistor
REC and PB
frequency response
adjustment
Test tape:VT703L
Signal input FM 22.5
DEV 60dB with
Emphasis
Signal output
terminal:PHONES
(with 32 ohm load)
At TUNER, set the BAND to the FM position, and
record the reference 1 kHz signal and 10kHz
signal alternately repeatedly. While playing back
the recorded signal differ from that of the 1 kHz
signal by within 0 ( +3 to -6) dB.
Level difference
between REC and
PB:Within 0
(+3 to -6) dB.
Item Measuring condition Check and adjustment procedure Standard value Adjusting part
AM IF adjustment Signal input:
Loop antenna
Signal output:
IC101 pin (16)
T103
AM tracking
adjustment
Signal input:
Loop antenna
PHONES (with 32
ohm load)
1. Set the intermediate frequency sweep generator
to AM 450 kHz.
Adjust the T103 for maxmum and center output.
2.
1. Set the TUNER at 530 kHz adjust T102 until the
test pin of VD103 voltage at 1.5 V +/- 0.1 V.
Set the TUNER at 1710 kHz, check the pin of
VD103 voltage at 9.0V +/- 0.5V.
Set the TUNER and S/G at 600kHz, adjust T101
for maximum output.
Set the TUNER and S/G at 1400 kHz, adjust
VC101 for maximum output.
Repeat the above steps 3 and 4.
2.
3.
4.
5.
T102
T101
VD103
Main board assemblyCassette mechanism section
CASSETTE MOTOR
Tape Speed Adj.
+
-
BIAS FREQUENCY
L203
J201
R225
R226
IC202
L101
VD101
IC101
VC102
T103
T102
VC101
T101
VD103
VD102

1-20 (No.MB297)
SECTION 5
TROUBLESHOOTING
Circuit Symptom Cause and Remedy
Defective earphone jack:
Replace the earphone jack.
Defect in IC801
Check voltages. Replace if necessary.
Defect in IC301
Check voltages. Replace if necessary.
AM
General
No sound,weak sound
(Low sensitivity)
No sound
Defect in IF T103:
Check resistance, voltage, and current. Replace as needed.
Defect AM antenna coil T101 or oscilloscope coil T102:
Replace if necessary.
Intermediate Frequency tuning faulty:
Readjust (see "Alignment and Adjustment").
RF tracking faulty:
Readjust (see "Alignment and Adjustment").
Defective IC101:
Check voltages. Replace if necessary.
Defective IC102:
Check voltages. Replace if necessary.
Poor contact in antenna circuit:
Check resistance and resolder.
FM No sound, weak sound
(Low sensitivity)
No sound/recording,
unsteady tape sound,
weak sound
Defective band selector switch:
Replace or repair the switch.
Defective IC101:
Check voltages. Replace if necessary.
Defective IC102:
Check voltages. Replace if necessary.
Intermediate Frequency tuning faulty:
Readjust (see "Alignment and Adjustment").
Poor contact in FM antenna circuit:
Resolder or repair as required.
Tape Dirty capstan or head:
Clean the capstan or head with alcohol.
Irregular cassette tape winding:
Replace tape.
Defective IC201:
Check voltage. Replace if necessary.
Cassette erasure prevention tabs broken out:
Replace tape or cover tab openings with adhesive tape.
CD Cannot read the table of
content.
no sound
Disc is dirty:
Wipe clean with a soft cloth.
Disc is seriously warped:
Use a new disc.
Moisture has formed inside the CD deck:
Wait about 20 to 30 minutes.
Defective IC601:
Check voltages. Replace if necessary.
Defective IC602:
Check voltages. Replace if necessary.
Defective IC603:
Check voltages. Replace if necessary.
Defective IC604:
Check voltages. Replace if necessary.
Defective IC606:
Check voltages. Replace if necessary.
Defective IC607:
Check voltages. Replace if necessary.
Defective IC608:
Check voltages. Replace if necessary.
Defective IC609:
Check voltages. Replace if necessary.
Defect in the CD pickup mechanism:
Replace as required.