JVC FS-M3 User manual

No.21067
Feb. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
SERVICE MANUAL
Contents
Safety precautions
Preventing static electricity
Important for laser products
Importance administering point
on the safety
Disassembly method
Adjustment method
1-2
1-3
1-4
1-5
1-6
1-15
1-18
1-19
1-19
1-20
1-21
1-29
Flow of functional operation
until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Trouble shooting
Description of major ICs
Wiring connections
FS-M3
Area suffix
J ----------------------------- U.S.A.
C -------------------------- Canada
FS-M3
DISPLAY
MODE
PHONES
PROGRAM
REC STOP/CLEAR PLAY/PAUSE
PRE EQ
/HBS
VOLUM E
REPEAT
SEARCH/TUNING
RANDOM
CD TUNER TAPE
BAND
COMPACT COMPONENT SYSTEM FS-M3
FULL LOGIC DECK
CD SYNCHRO RECORDING
TIMER
ON/OFF
SET
REMAIN
EJECT
INTRO
PRESET
OPEN
/CLOSE
STANDBY
/ON
CD/RANDOM TAPE
DISPLAY
MODE
PROGRAM
REC
SLEEP PRE UP
TIMER
BEAT CUT
STANDBY/ON
+
VOLUME
–
TUNER
/BAND
REPEAT
/PRE DOWNINTRO
REMAIN
RM-SFSM3J REMOTE CONTROL
MUTING
PRE EQ/HBS
COMPACT COMPONENT SYSTEM

FS-M3
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 each exposed 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.
(This regulation does not correspond to J and C version.)

FS-M3
1-3
Short land
CD pickup unit
Connector
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
5. Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
Apply solder to the short land before the card wire is disconnected from
the connector on the CD pickup unit.
(If the card wire is disconnected without applying solder, the CD
pickup may be destroyed by static electricity.)
In the assembly, be sure to remove solder from the short land after
connecting the card wire.
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.
Preventing static electricity
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 CD players.
Be careful to use proper grounding in the area where repairs are being performed.
2. About the earth processing for the destruction prevention by static electricity
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.
2-1 Ground the workbench
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
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.
3. Handling the optical pickup
1.
2.
Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
Remove solder of the short land on the card wire 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.
Handle the card wire carefully as it may break when subjected to strong force.
It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
4. Handling the traverse unit (optical pickup)
1.
2.
3.
4.

FS-M3
1-4
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
CLASS 1
LASER PRODUCT
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CAUTION: INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCK DEFEATED. AVOID EXPOSURE TO BEAM.
ADVARSEL: USYNLIG LASERSTR Å LING VED Å BNING N Å R
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDG
Å
UDSAETTELSE FOR STR Å LING.
VARO: AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET
ALTTIINA NÄKYMÄTTOMÄLLE LASERSÄTEILYLLE ÄLÄ KATSO
SÄTEESEEN.
VARNING: OSYNLIG LASERSTRALNING NAR DENNA DEL
AR OPPNAD OCH SPARREN AR URKOPPLAD. BETRAKTA EJ
STRALEN.

FS-M3
1-5
Caution: For continued protection against risk of
fire, replace only with same type 1.6A/250V for
F901,3.15A/250V for F902,1.6A/250V for F903.
This symbolspecifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F901 comme le meme type
que 1.6A/250V,F902 comme le meme type que
3.15A/250,et 1.6A/250V pour F903.
Ce sont des fusibles suretes qui functionnes rapide.
Importance administering point on the safety
F903
F902
F901

FS-M3
1-6
Fuse(F903)
1.6A 250V
Fuse(F901)
1.6A 250V
Heat sink
Soldered part a
A
Power board
Fuse(F902)
3.15A 250V
Fig.1
Fig.2
Main board
Power amplifier IC
(IC401)
Replacing the fuses (See Fig. 1.)
<Main body section>
Remove the left side panel according to its
disassembly method (see Figs. 5 and 6).
Fuses are located inside the left side panel.
Disassembly method
Replacement of the fuses and power amplifier IC
[Caution] Be sure to replace the required fuses
with designated ones.
Replacing the power amplifier IC on
the main board (See Fig. 2.)
1.
2.
Remove the main board according to its
disassembly method (see Figs. 17 and 18).
Remove the two screws Athat attach the power
amplifier IC onto the heat sink.
In order to replace the power amplifier IC, remove
the solder from soldered part aon the back side of
the main board.

FS-M3
1-7
Fig.3
Fig.4
B
B
C
C
Right side
panel
Fig.5
BC
C
Right side
panel
1
Claw b
Fig.6
Left side
panel
Left side
panel
3
Claw c
2
4
B
Removing the right side panel
(See Figs. 3 and 4.)
1.
2.
From the right side of the main body, remove the
three screws Band three screws Cretaining the
right side panel.
Slide the right side panel toward the rear (in the
direction of arrow 1) until the claw bat the back of
the panel is hooked by the chassis and then lift the
panel upward (in the direction of arrow 2) to
remove it.
Removing the left side panel
(See Figs. 5 and 6.)
1.
2.
From the left side of the main body, remove the
three screws Band three screws Cretaining the
left side panel.
Slide the left side panel toward the rear (in the
direction of arrow 3) until the claw cat the back of
the panel is hooked by the chassis, and then lift the
panel upward (in the direction of arrow 4) to
remove it.

FS-M3
1-8
D
D
H
Fig.8
Fig.11Fig.10
Fig.9
Fig.7
Lift the rear
part to remove.
Top cover
(To be loosened)
Rear panel
1
2
1
H.P. jack
board
Connector on the
cassette switch
board Power board
Tie band
CN902
CN402
CN608
CD mechanism
assembly
Front panel assembly
Hook d
Hook d
F
F
F
G
G
E
CD mechanism
assembly
CN607
Chassis
CN201
Ferrite core
Tie band
Removing the top cover
(See Figs. 7 and 8.)
1.
2.
From the back side of the main body, loosen the
two screws Dretaining the top cover.
Lift the rear part of the top cover to remove it.
Removing the front panel assembly
(See Figs. 9 to 11.)
1.
2.
3.
4.
5.
6.
7.
8.
9.
Remove the tie band bundling the wires.
Disconnect the wire from the connector CN902 on
the power board.
Disconnect the wire from the connector on the
cassette switch board.
Remove the screw Eretaining the bracket on the
H.P. jack board.
Disconnect the wires from the two connectors
CN201 and CN402 on the main board.
Disconnect the wires from the two connectors
CN607 and CN608 on the CD & MCU board.
Remove the four screws Fand the two screws G
retaining the bracket of the CD mechanism
assembly from the left and right.
Remove the screw Hretaining the front panel
assembly from the bottom side of the main body.
While opening the hooks dto the left and right of
the lower part of the front panel assembly (in the
direction of arrows 1), slide the front panel
assembly toward the front (in the direction of arrow
2).
Remove the left and right side panels.
Remove the left and right side panels.
Remove the top cover.
[Note] After assembly, apply a locking agent to
the screws F and G.

FS-M3
1-9
K
Fig.13
Fig.12
CD & MCU board
CD mechanism assembly
CD & MCU board
CD & MCU board
J
CN701
CN603
Tie band
K
Fig.14
Main board
CN601
CN602
Stud
CD mechanism assembly
Removing the CD mechanism
assembly (See Figs. 12 to 14.)
1.
2.
3.
4.
5.
Remove the left and right side panels.
Remove the top cover.
Remove the front panel assembly.
Disconnect the wires from the four connectors
CN601, CN602, CN603 and CN701 on the CD &
MCU board.
From the left side of the main body, remove the tie
band bundling the wires.
Loosen the screw Jretaining the main board.
From the left and right sides of the main body,
remove the four screws Kretaining the bracket.
Slide the CD mechanism assembly toward the front
and remove it from the studs of the main board.
[Note] After assembly, apply a adhesive agent
to the stud.

FS-M3
1-10
Fig.17
Fig.16
Fig.15
Rear panel
Speaker terminal
M
L
Stud Stud
Stud
Chassis
CN901
Power board
Power transformer Main board
Fig.18
N
Chassis Heat sink
Soldered part e
Main board
Radio pliers, etc.
Power board
Chassis
Power transformer
FM antenna wire
Removing the power board
(See Figs. 15 and 16.)
1.
2.
3.
Remove the left and right side panels.
Disconnect the wire from the connector CN901 on
the power board.
Remove the two screws Lretaining the chassis .
Remove the power board by pinching the two studs
retaining the board using radio pliers, etc.
Removing the main board
(See Figs. 17 and 18.)
1.
2.
3.
4.
Remove the left and right side panels.
Remove the top cover.
Remove the front panel assembly.
Remove the CD mechanism assembly.
Remove the two screws Mretaining the speaker
terminal of the main board.
From the top side of the main body, remove the
screw Nretaining the heat sink of the main board.
Remove the solder from the soldered part ethat
attaches the FM antenna wire to the main board.
Slide the main board toward the front to remove it
from the chassis.
[Note] After assembly, apply a locking agent to
the screw N.
[Note] After assembly, apply a locking agent
to the screw L.
After assembly, apply a adhesive agent
to the studs.

FS-M3
1-11
Fig.20
Fig.21
Fig.22
Fig.19
R
P
T
S
P
Q
U
Cassette door
Claw f
Claw g
Claw h
Disengage the spring so
that it comes to the front
of the claw h.
Cassette door cover
Front panel assembly
Front panel assembly
Front panel assembly
Arm section i
Arm section k
Shaft section j
Spring
Shaft section m
Cassette door
sttoper
Cassette door
damper
Cassette
mechanism
assembly
Damper bracker
Key switch board
Spring
Bracket
R
REC/PB head wire
Tie band
Removing the key switch board
(See Fig. 19.)
Remove the ten screws Pretaining the key switch
board.
Removing the cassette door
(See Figs. 21 and 22.)
1.
2.
3.
4.
5.
Open the cassette door, disengage the spring
hooked across the front of the front panel assembly
and the cassette door in the outward direction, and
remove it from the claw h.
From the back side of the front panel assembly,
remove the two screws Uretaining the bracket.
While pushing the arm section iof the cassette
door in the direction of the arrow, remove the shaft
section jof the cassette door from the front panel
assembly.
While pushing the cassette door arm section kin
the direction of the arrow, remove the shaft section
mof the cassette door from the front panel
assembly.
Take out the cassette door from the back side of
the front panel assembly.
Remove the left and right side panels.
Remove the top cover.
Remove the front panel assembly.
Remove the cassette mechanism assembly.
Remove the cassette door cover.
[Note] After assembly, apply a locking agent
to the screws Q and R.
<Front panel assembly section>
Removing the cassette mechanism
assembly (See Fig. 19.)
Remove the two screws Qand the two screws R
retaining the cassette mechanism assembly.
Remove the tie band bundling the REC/PB head
wire.
Removing the cassette door damper
and cassette door stopper(See Fig. 19.)
Remove the screw Sretaining the damper bracket
and take out the cassette door damper.
Remove the two screws Tretaining the cassette
door stopper and remove the cassette door
stopper.
Removing the cassette door cover
(See Fig. 20.)
1.
2.
Open the cassette door.
Slide the cassette door cover in the direction of the
arrow and disengage the two claws fand the two
claws gon the left and right of the cassette door
cover from the cassette door.
[Note] Use the following procedure to remove
only the cassette door cover.
This procedure does not require the
removal of exterior parts such as the
side panels.
[Caution] In the assembly, be sure to put the
spring around the shaft j before
attaching the cassette door.
1.
2.
1.
2.
[Note] After assembly, apply a locking agent
to the screws S and T.
[Note] After assembly, apply a locking agent
to the screw U.

FS-M3
1-12
Fig.23
Fig.24
Fig.25
V
V
CD & MCU board
Stud
Stud
CD & MCU board
CD mechanism assembly
CD pickup assembly Damper(Blue)
CD pickup unit
W
CN704
W
Damper(Gray)
Damper(Blue)Damper(Gray)
CD pickup
assembly
Short land part n
CN703
CN702
Removing the CD & MCU board
(See Figs. 23 and 24.)
1.
2.
3.
4.
5.
From the back side of the CD mechanism
assembly, remove the four screws Vretaining the
CD & MCU board.
Disengage the two studs retaining the CD & MCU
board.
Disconnect the wires from the two connectors
CN702 and CN703 on the CD & MCU board.
Lift the CD & MCU board and attach solder to the
short land part non the CD pickup assembly.
Disconnect the card wire from the connector
CN704 on the CD & MCU board, and take out the
CD & MCU board.
[Caution] Be sure to solder the short land
part n on the CD pickup unit before
disconnecting the card wire from the
CD pickup assembly (see Fig. 24).
If the card wire is disconnected
without attaching solder, the CD
pickup may be destroyed by static
electricity.
In the assembly, be sure to remove
solder from the short land part n
after connecting the card wire.
Remove the left and right side panels.
Remove the top cover.
Remove the front panel assembly.
Remove the CD mechanism assembly.
<CD mechanism section>
Removing the CD pickup assembly
(See Fig. 25.)
1.
2.
Remove the CD & MCU board.
From the back side of the CD mechanism
assembly, remove the four screws Wretaining the
CD pickup assembly.
Take out the CD pickup assembly.
[Note] When removing or replacing the
dampers, note their colors and be sure
to attach them in their correct positions.
[Note] After assembly, apply a locking
agent to the screw V.
After assembly, apply a adhesive
agent to the studs.

FS-M3
1-13
Fig.26
Fig.27
Fig.28
Fig.29
X
CD mechanism assembly
Clamper assembly
Claw p
Claw q
CD mechanism assembly
Tray motor pulley
Claw q
rsection
Tray
TrayClaw s
Claw s
Claw t
Belt
Transparent cover
Removing the tray motor
(See Figs. 26 to 29.)
1.
2.
3.
4.
5.
6.
7.
8.
Remove the CD & MCU board.
On the top of the CD mechanism assembly, open
up the claws pand qat the left and right of the
clamper assembly and lift the assembly to remove
it.
On the top of the CD mechanism assembly, push
the section rof the elevator in the direction of the
arrow and lower the CD pickup assembly.
Pull out the tray.
While opening up the claws sat the left and right of
the tray in the directions of the arrows, remove the
tray.
While pushing the claw ton the CD mechanism
assembly downwards, slide the elevator fully in the
direction of the arrow.
Remove the transparent cover.
Remove the belt from the tray motor pulley.
Remove the two screws Xretaining the tray motor
and remove it.
[Note] Take care not to attach grease on the
belt.
After attaching the tray motor in the
assembly, apply a locking agent to the
screws X.

FS-M3
1-14
Fig.30
Fig.31
Fig.32
Fig.33
Clamper assembly Front panel assembly
Claw p
Claw g
Y
Y
CD pickup assembly
Front panel assembly
Claw g
rsection
TraySlit washer
Feed middle gear
Card wire
Sliding spring
Short land part n
Replacing the CD pickup unit
(See Figs. 30 to 33.)
1.
2.
3.
4.
5.
6.
7.
8.
9.
Remove the left and right side panels (see Figs. 3
to 6).
Remove the top cover (see Figs. 7 and 8).
On the top of the main body, open up the claws p
and qon the left and right of the clamper assembly
in the direction of the arrows and lift the assembly
to remove it.
On the top of the main body, push section ron the
elevator of the CD mechanism assembly and lower
the CD pickup assembly.
Pull out the tray.
Remove the slit washer retaining the feed middle
gear, and take out the feed middle gear.
Remove the two screws Yretaining the shaft.
Turn the CD pickup unit upside down and apply
solder to the short land part n.
Disconnect the card wire from the CD pickup unit
and replace the unit.
[Note] Use the following procedure to replace
only the CD pickup unit.
[Caution] Be sure to solder the short land
part n on the CD pickup unit before
disconnecting the card wire from the
CD pickup unit (see Fig. 33).
If the card wire is disconnected
without attaching solder, the CD
pickup may be destroyed by static
electricity.
In the assembly, be sure to remove
solder from the short land part n
after connecting the card wire.
[Note] Removing the CD pickup unit
involves the removal of the sliding
spring. In the assembly, be sure to
attach the spring in the correct
orientation before attaching the CD
pickup unit (see Fig. 33).

FS-M3
1-15
Adjustment method
Measuring instructions required for
adjustment
1. AM signal generator
2. FM signal generator
3. Inter mediate frequency sweep generator
4. FM stereo signal generator
5. Low-frequency oscillator
(oscillation frequency 50Hz-20kHz, 0dB output
with 600 ohm impedance)
6. Attenuator (600 ohm impedance)
7. Electronic voltmeter
8. Distortion meter
9. Torque gauge (cassette for CTG-N)
10. Wow & flutter meter
11. Frequency counter meter
12. Test tape
VT712 : For tape speed and wow flutter
VT724 : For reference level
VT703 : For playback frequency
VT703 : For head azimuth adjustment
13. Blank tape
TAPE : AC-225
Measurement conditions
Power supply voltage
AC120V/60Hz
Measuring instruments
Radio section
FM 1kHz, 22.5kHz deviation
FM STEREO : 1kHz, 67.5kHz deviation
pilot signal 7.5kHz
AM : 1kHz, 30% modulation
Reference output :
H.phone output -10dBs(0.245V) 32 ohm
Speaker output 0dBs(2.8V) 8 ohm
Cassette amplifier section
Reference output :
H.phone output -10dBs(0.245V) 32 ohm
Speaker output 0dBs(2.8V) 8 ohm
Standard mode of function knob :
Press TAPE knob of select TAPE mode
CD section
CD test disc : CTS-1000

FS-M3
1-16
Cassette amplifier section
Item Measuring condition Check and adjustment procedure Standard value Adjusting part
Play back the test tape VT703 (10kHz).
Adjust the head azimuth adjusting screw so that the
phase difference between the R and L channels is
minimized at an output level that is within 2dB of the
maximum output level. After this adjustment, lock the
head 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.
Test tape:
VT703 (10kHz)
Signal output terminal:
H.phone out
(with 32 ohm load)
Head azimuth
adjustment
1.
2.
3.
Output level:
Within 2dB of
maximum output
level
Phase difference R
and L channels:
Minimum
Head azimuth
adjusting screw
(To be used only
after head
replacement)
See Fig.1 on
page 1-16.
Play back the test tape VT712 (3kHz) by the end
portion.
Connect a frequency counter and check that it reads
between 2940 and 3090Hz. If not, adjust the frequency
with the motor semifixed resistor.
Check that the wow/flutter is within 0.38%
(unweighted).
Test tape:
VT712 (3kHz)
Signal output terminal:
H.phone out
(with 32 ohm load)
Tape speed and
wow/flutter check
and adjustment
1.
2.
3.
2940 to 3090Hz
Within 0.38%
(unweighted)
Tape speed:
Motor semifixed
resistor
See Fig.2 on
page 1-16.
Check only
Play back the test tape VT703 while con-firming that
deviation between the 1kHz signal and 8kHz signal
should be (0+3dB-6dB).
Test tape: VT703
Signal output terminal:
H.phone out
(with 32 ohm load)
PB frequency
response check
Deviation between
1kHz and 8kHz:
(0+3dB-6dB)
Set the TUNER or CD function and with TAPE to
record. Check to see if the frequency at the measuring
point P207 is 68kHz 1kHz if not adjust L203 until the
frequency counter indicates 68 kHz 1kHz.
Tape: Normal
Signal output terminal:
Cassette REC./PLAY
HEAD
Bias frequency
check
L203, P207
See Fig.3 on
page 1-16.
At TUNER, set the BAND to the FM position, and
record the reference 1kHz signal and 8kHz signal
alternately repeatedly. While playing back the recorded
signal of the 1kHz signal differ from that of the 8kHz
signal by within (0+3dB-6dB).
Test tape: AC225
Signal input:
SG 1kHz -20dBs
with emphasis
Signal output terminal:
H.phone out
(with 32 ohm load)
REC and PB
frequency
response
adjustment
Level difference for
1kHz singnal: Within
(0+3dB-6dB)
Tuner section
Item Measuring condition Check and adjustment procedure Standard value Adjusting part
Set the intermediate frequency sweep generator to AM
450kHz.
Adjust T101 for maximum and center output.
Signal input:
Loop antenna
Signal output:
IC101 pin19
AM IF adjustment 1.
2. T101
See Fig.3 on
page 1-16.
Set the TUNER at 87.5MHz adjust L106 until the test
point P102 voltage at 2.3V 0.1V.
Set the TUNER at 108MHz, check the test point P102
voltage at 6.5V 0.3V.
Set the TUNER and S/G at 90.1MHz, adjust L105 for
maximum output.
Set the TUNER and S/G at 106.1MHz, adjust the
TC101 for maximum output.
Repeat the above steps 3 and 4.
Signal input:
Dummy antenna
FM ANT
FM GND
Signal output:
H.phone out
(with 32 ohm load)
FM tracking
adjustment
1.
2.
3.
4.
5.
L106
L105
TC101
See Fig.3 on
page 1-16.
Set the TUNER at 530kHz adjust L101 until the test
point P101 voltage at 1.1V 0.1V.
Set the TUNER at 1710kHz, check the test point P101
voltage at 7.0V 0.3V.
Set the TUNER and S/G at 600kHz, adjust L102 for
maximum output.
Set the TUNER and S/G at 1400kHz, adjust the TC102
for maximum output.
Repeat the above steps 3 and 4.
Signal input:
Loop antenna
Signal output:
H.phone out
(with 32 ohm load)
AM tracking
adjustment
1.
2.
3.
4.
5.
L101
L102
TC102
See Fig.3 on
page 1-16.

FS-M3
1-17
Fig.1 Head output signal
Adjustment
Head
max
Azimuth adjustment screw
CASSETTE MOTOR
Tape Speed Adj.
+-
Location of adjusting parts
Cassette mechanism section
Fig.2
Main board
TA2104
(FM OSC)
P102
(FM VT)
(FM RF)
(FM RF)
(AM RF)
(AM RF)
(AM IF)
(BIAS FREQUENCY ADJ.)
P207
(BIAS FREQUENCY)
P101
(AM VT)
FM ANT
(AM ANT) (AM OSC)
CN101
L101
TC101 L106
L105
IC101
TC102
L102
T101
L203
Fig.3
(Caution) For adjusting any head, be sure to use a screw driver degaussed.

FS-M3
1-18
Flow of functional operation until TOC read
Power ON Slider turns REST
SW ON.
Laser ON
Confirm that the voltage at the pin5 of CN703 is
"H"/"L"/"H"
Check that the voltage at the pin10(LD) of
CN704 is +1.35V.
Focus start
FOK
PLL Lock
Turn on radial
servo
Read TOC Confirm the eye-pattern at the "RF" test point.
Turn on focus
servo
Disc spinning
Radial_error
scaling
Check that the voltage at the pin1 and pin2 of
CN703 is +0.65V.
Before connecting a measuring instrument to
the measuring point, turn the power of the
main unit to OFF.
After performing a measurement and before
disconnecting the measuring instrument,
again turn the power of the main unit to OFF.
(If a measuring instrument is disconnected
while an electric current is being output to the
main unit, the pick up of the main unit will be
damaged.)
Caution

FS-M3
1-19
Turn off the power switch and,disconnect the
power cord from the AC OUTLET.
Replace the pickup with a normal one.(Refer
to "Removing the CD pickup" on the previous page)
Plug the power cord in,and turn the power on.
At this time,check that the laser emits for
about 3 seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at the "RF" test point.
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.
The level of RF output (EFM output:ampli-
tude of eye pattern) will below.
Is the level of
RF OUT under
1.25V 0.22Vp-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 would be adjusted when the pickup operates normally,the laser pickup may be damaged
due to excessive current.
Replacement of laser pickup

FS-M3
1-20
Trouble shooting
Circuit Symptom Cause
Speakers are not connected.
Wrong function is selected.
Defective volume control
Defective earphone jack
Defect in IC601
Defect in IC301
No soundGeneral
Remedy
Check the speaker connection.
Set switch to the proper position.
Set the volume control to a proper sound
level.
Replace the earphone jack.
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Improper location of unit
Defect in IFT101
Defect AM antenna coil or oscilloscope coil
Intermediate frequency tuning faulty
RF tracking faulty
Defective IC101
Defective IC102
Poor contact in antenna circuit
No sound, weak sound
(Low sensitivity)
AM Rotate or resposition the unit.
Check resistance, voltage, and current.
Replace as needed.
Replace if necessary.
Readjust (see "Adjustment method").
Readjust (see "Adjustment method").
Check voltages. Replace if necessary.
Check resistance and resolder.
Check resistance and resolder.
FM antenna not connected
Defective band selector switch
Defective IC101
Defective IC102
Intermediate frequency tuning faulty
Poor contact in FM antenna circuit
No sound, weak sound
(Low sensitivity)
FM Connect the built-in or external antenna.
Replace or repair the switch.
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Readjust (see "Adjustment method").
Resolder or repair as required.
Dirty capstan or head
Irregular cassette tape winding
Defective IC202
Cassette erasure prevention tabs broken out
No sound/recording,
unsteady tape sound,
weak sound
Tape Clean the capstan or head with alcohol.
Replace tape.
Check voltages. Replace if necessary.
Replace tape or cover tab openings with
adhesive tape.
Disc is inserted upside down.
Disc is dirty.
Disc is scratched.
Disc is seriously warped.
A non-standard disc has been inserted.
Moisture has formed inside the CD deck.
Defective IC701
Defective IC704
Defective TA2092N
Defect in the CD pickup mechanism
Cannot read the table
of content.
No sound
CD Insert disc correctly.
Wipe clean with a soft cloth.
Use a new disc.
Use a new disc.
Use only a brand name disc.
Wait about 20 to 30 minutes.
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Check voltages. Replace if necessary.
Replace as required.