JVC FS-SD550R User manual

SERVICE MANUAL
COMPACT COMPONENT SYSTEM
No.20923
Mar. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
FS-SD550R / FS-SD770R / FS-SD990R
Contents
Safety Precautions
Important for laser products
Preventing static electricity
Dismantling and assembling
the traverse unit
Disassembly method
Maintenance of laser pickup
Replacement of laser pickup
Flow of functional operation
unit TOC read
Method of connecting
treatment device wire
Description of major ICs
2-1
2-2
2-3
2-4
2-5
2-14
2-14
2-15
2-16
2-17
REMOTECONTROL
DIMMER SLEEP
DISPLAY FMMODE
AHBPRO CD
PROGRAM
DOOR
SLIDE
AUTO
PRESET
REPEATRANDOM
BASS TREBLE CANCEL
UP
SET
DOWN
MD/AUX FM / AM
VOLUME
CD
FADEMUTING
PTY/EON DISPLAYMODE
FS-SD550R
FS-SD770R, FS-SD990R
REMOTECONTROL
DIMMER SLEEP
DISPLAY FMMODE
AHBPRO CD
PROGRAM
DOOR
SLIDE
AUTO
PRESET
REPEATRANDOM
BASS TREBLE CANCEL
UP
SET
DOWN
MD/AUX FM / AM
VOLUME
CD
FADEMUTING
PTY/EON DISPLAYMODE
The difference between FS-SD550R and FS-SD770R FS-SD990R is only the speaker systems.
The difference between FS-SD770R and FS-SD990R is cabinets of the speaker.
FS-SD550R
FS-SD770R / FS-SD990R
Area Suffix
B
E
EN
U.K
Continental Europe
Northern Europe
CD-ROM No.SML200103
These models not have adjustment.

FS-SD550R/FS-SD770R/FS-SD990R
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.

FS-SD550R/FS-SD770R/FS-SD990R
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 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 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 : Invisible 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)
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.

FS-SD550R/FS-SD770R/FS-SD990R
1-4
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

FS-SD550R/FS-SD770R/FS-SD990R
1-5
Dismantling and assembling the traverse unit
Notice regarding replacement of optical pickup
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 to the optical pickup or connected devices.
1. Do not touch the area around the laser diode and actuator.
2. Do not check the laser diode using a tester, as the diode may easily be destroyed.
3. It is recommended that you use a grounded soldering iron when shorting or removing the laser diode.
Recommended soldering iron: HAKKO ESD-compatible product
4. Solder the land on the optical pickup's flexible cable.
Note : Short the land after shorting the terminal on the flexible cable using a clip, etc., when using an
ungrounded soldering iron.
Note : After shorting the laser diode according to the procedure above, remove the solder according
to the text explanation.
Shorting
Flexible cable
KSM-900AAH
Sub board
(Reverse side)

FS-SD550R/FS-SD770R/FS-SD990R
1-6
Piro to performing the following procedure, remove
the CD door.
Remove the ten screws Band the five screws C
attaching the rear cover on the back of the body.
1.
<Main body>
Removing the rear cover (See Fig.2)
Remove the four screws Aattaching the CD door on
the upper side of the body.
1.
Removing the CD door (See Fig.1)
Prior to performing the following procedure, remove
the CD door, the rear cover.
Remove the four screws Dattaching the side covers
on the bottom of the body.
Move the left cover backward and remove outward.
Also remove the right cover in the same way.
1.
2.
Removing the right and left covers
(See Fig.3)
Disassembly method
Fig.1
Fig.2
Fig.3
B
BB
B
B
B
CCC
Rear cover
D
DRight cover
Left cover
Bottom
CD door
A
A

FS-SD550R/FS-SD770R/FS-SD990R
1-7
Prior to performing the following procedure, remove
the CD door, the rear cover and the side covers.
Remove the three screws Eon the bottom of the
body.
Release two joints aand two joints bon both sides
of the body using a screwdriver and remove the front
panel assembly toward the front.
1.
2.
Removing the front panel assembly
(See Fig.4 to 6)
Prior to performing the following procedure, remove
the CD door, the rear cover, the side covers and the
front panel assembly.
Disconnect the card wire from connector CN104 and
CN105 of the main board in the front part of the
body. Disconnect the card wire from CN101 of the
main board on the right side, and the wire from
CN705 and CN of the CD mechanism base
assembly respectively.
Remove the four screws Fattaching the CD
mechanism base assembly on the upper side of the
body. Remove the screw Iattaching the earth
terminal on the right side.
1.
2.
Removing the CD mechanism base
assembly (See Fig.7 to 14)
Fig.4
Fig.6Fig.5
E
Front panel assembly
(Left side) (Right side)
Front panel assembly
Joints a Joints b
Bottom
Fig.7
Fig.8
FF
CD mechanism base assembly
CD mechanism base assembly
Main bard
CN105
CN104
Front panel assembly F

FS-SD550R/FS-SD770R/FS-SD990R
1-8
Remove the screw Gattaching the power amplifier
board on the back of the body. Disconnect the wire
from connector CN301 and pull the power amplifier
board fully outward.
Raise the right and left door arms by turning the gear
ain the rear of the power amplifier board.
After the CD mechanism base assembly is detached
from the door arms, pull the CD mechanism base
assembly toward the front and disconnect the wire
from connector CN804 on the left side of the door
arm board.
Pull out the CD mechanism base assembly toward
the front.
3.
4.
5.
6. Fig.9
Fig.10
Fig.11
F
I
CD mechanism base assembly
Main board
CN101
CN708
FCD mechanism base assembly
CN804
CD mechanism base assembly
CN301
G
Power amplifier board
Fig.13 Gear a
Fig.12
Fig.14
CD mechanism base assembly
Power amplifier board
Door arm
Door arm
IGear a
CD mechanism base assembly
Door arm board (L)
CN804
CN705

FS-SD550R/FS-SD770R/FS-SD990R
1-9
Prior to performing the following procedure, remove
the rear cover, the side covers, the front panel
assembly and the CD mechanism base assembly.
In case that the upper parts of the door arms
attached to the CD door are not level, let down them
to the level position by turning the gear ain the
direction of the arrow.
1.
Removing the door arm assembly / the
door arm board (R) and (L)
(See Fig.15 to 20)
When the door arms incline, the door
arm assembly and the door arm board
(R) and (L) may not be removed.
ATTENTION:
Remove the four screws Hon the upper side and
the one screw Ion the left side of the body.
Remove the four screws Jattaching the door arm
board (L) and (R) on both sides of the door arm
assembly.
2.
3.
Fig.15
Fig.16
Fig.18
Fig.20
Fig.17
Fig.19
Door arm
Door arm board (L)
Door arm
Door arm board (R)
Door arms (Attached to the CD door)
H
H
Door arm assembly Door arm assembly
J
J
I
Door arm board (L)
Door arm assembly
J
J
Door arm board (R)
Fan motor

FS-SD550R/FS-SD770R/FS-SD990R
1-10
Prior to performing the following procedure, remove
the CD mechanism base assembly.
Disconnect the wires from connector CN102 and
CN193 on the main board and release them from the
cord stopper respectively.
Remove the two screws Kand the two screws L
attaching the heat sink and the power amplifier
board.
1.
2.
Removing the power amplifier board
(See Fig.21 and 22)
Prior to performing the following procedure, remove
the CD mechanism base assembly.
Disconnect the wires from connector CN191 and
CN192 on the main board and release them from the
cord stopper respectively.
Remove the four screws Mattaching the transformer
assembly.
1.
2.
Removing the transformer assembly
(See Fig.21)
Prior to performing the following procedure, remove
the CD mechanism base assembly and the door arm
assembly.
Disconnect the wires from connector CN106 on the
main board and release it from the cord stopper.
Remove the three screws Nattaching the gear
motor assembly. Remove the gear motor assembly
with the gear motor stopper.
Remove the belt from the gear motor assembly.
Remove the two screws Ofrom the gear motor
assembly.
1.
2.
3.
4.
Removing the gear motor assembly
(See Fig.23 and 24)
Fig.21
Fig.22
Fig.23
Fig.24
Power amplifier board
Door arm assembly
CN191 CN193
Cord stopper
Cord
stopper
Main board
CN106
CN181
CN192CN102
Cord stopper
M
M
Transformer assembly
Power amplifier board
Heat sink K
L
Gear motor stopper Gear motor assembly
Cord stopper
CN106
N
N
Motor
Belt
O
Cord stopper

FS-SD550R/FS-SD770R/FS-SD990R
1-11
Prior to performing the following procedure, remove
the CD mechanism base assembly.
Disconnect the wires from connector CN181 on the
main board.
Remove the two screws Pon the left side of the
body. Move the fan motor assembly upward to
remove it from the base chassis.
Remove the two screws Qand the fan motor from
the fan bracket.
1.
2.
3.
Removing the fan motor assembly
(See Fig.25 and 26)
Prior to performing the following procedure, remove
the front panel assembly.
Remove the seven screws Sattaching the front
panel board inside the front panel assembly.
1.
Removing the front panel board
(See Fig.28)
<Front panel assembly>
Prior to performing the following procedure, remove
the CD mechanism base assembly and the door arm
assembly.
To facilitate operation process, remove the gear
motor assembly before performing the following
procedure.
Disconnect the wires from connector CN102, CN106,
CN191, CN192, CN193 and CN181 on the main
board.
Remove the five screws Rattaching the main board
with the cord stopper.
1.
2.
Removing the main board (See Fig.27)
Fig.25
Fig.26
Fig.27
Fig.28
Main bard
CN181
Fan motor
P
Fan motor
Fan bracket
Q
Gear motor assembly
Main board
CN193
CN191 CN106
CN181 CN102
CN192
R
R
R
R
Front panel board
S
S
S
S

FS-SD550R/FS-SD770R/FS-SD990R
1-12
Remove the screw T attaching the speaker terminal
board on the underside of the CD mechanism base
assembly.
1.
Prior to performing the following procedure, remove
the CD mechanism base assembly.
Refer to "Dismantling and assembling the CD
mechanism assembly" on page 1-5 for the treatment
of optical pickup.
Removing the speaker terminal board
(See Fig.29)
<CD mechanism base assembly>
Turn over the CD mechanism base assembly and
disconnect the wire from connector CN703 and
CN706 on the CD mechanism board.
Turn over the CD mechanism base assembly and
disconnect the wires from connector CN703 and
CN706 on the CD mechanism board.
Turn back the CD mechanism assembly and detach
the CD mechanism cover while pulling the CD
mechanism assembly outward to release the two
joint tabs marked c.
1.
2.
3.
Removing the CD mechanism board / CD
mechanism assembly (See Fig.29 to 34)
Fig.29
CD mechanism board
CD mechanism
cover
Speaker terminal board
CN706
CN703
T
U
U
U
U
Fig.30
Fig.31
CD mechanism assembly
CD mechanism assembly
Joint c
Tab
CD mechanism cover
CD mechanism cover
Tab
Joint c

FS-SD550R/FS-SD770R/FS-SD990R
1-13
Solder the short circuit land on the sub board.
Disconnect the wire from connector CN605 on the
main board.
Disconnect the sub board from connector CN603 on
the main board while peeling off the adhesive tape
on the underside of the sub board.
Remove the CD mechanism assembly from the three
shafts of the CD mechanism
cover.
4.
5.
6.
When reassembling, confirm that the
cushion of the CD mechanism
assembly is reattached to the three
shafts.
ATTENTION:
Remove the CD mechanism board from the CD
mechanism cover.
7.
Fig.33
Fig.32
CD mechanism assembly
CD mechanism cover
CD mechanism board CN605
Cushion Cushion
CD mechanism cover
CD mechanism board
Shafts
Short circuit land
Sub board
CN606
Sub board Short circuit land
Main board
CN603
CD mechanism assembly
CN605
CN605
Fig.34

FS-SD550R/FS-SD770R/FS-SD990R
1-14
Prior to performing following procedure, remove the
CD mechanism board.
Disconnect the wire from connector CN502 on the
jack board.
Remove the two screws V attaching the jack board.
1.
2.
Removing the jack board (See Fig.35)
Prior to performing following procedure, remove the
CD mechanism board.
Disconnect the wire from connector CN502 on the
jack board.
Remove the six screws W attaching the switch
board.
1.
2.
Removing the switch board (See Fig.35)
Disconnect the harness from connector CN706 on
the CD mechanism board on the underside of the
CD mechanism base assembly.
Push inward the two tabs d attaching the LED board
case and release them.
Pull out the LED board from the LED board case.
1.
2.
3.
Removing the LED board
(See Fig.36 and 37)
Fig.35
Fig.36
Fig.37
Jack board
Switch board
CN502
V
V
WW
Tabs d
CD mechanism board
CN706
LED board
LED board case

FS-SD550R/FS-SD770R/FS-SD990R
1-15
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:amplitude
of eye pattern) will below.
Is the level of
RFOUT 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 is adjusted while the pickup is functioning normally,the laser pickup may be damaged
due to excessive current.
Replacement of laser pickup

FS-SD550R/FS-SD770R/FS-SD990R
1-16
Flow of functional operation until TOC read
Slider turns REST
SW ON.
Automatic tuning
of TE offset
Laser ON
Detection of disc
Automatic measurement of
Focus S-curve amplitude
Automatic tuning of
Focus 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 states
Tracking
servo
off states
Disc states
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 25 of
IC601(TE)
Approx
1.8V
VREF
Tracking error waveform at TOC reading
Power ON Play Key
Confirm that the Focus error
S-cuve signal at the pin28 of
IC603 is approx.2Vp-p
Confirm that the signal from
pin24 IC603 is 0V as a
accelerated pulse during
approx.400ms.
Confirm the waveform of
the Tracking error signal.
at the pin 26 of IC601 (R6005)
(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 TP602
Confirm that the voltage at the pin4
of CN605 is "H"/"L"/"H".
Check Point
Check that the voltage at the
pin40 of IC603 is + 5V?

FS-SD550R/FS-SD770R/FS-SD990R
1-17
Method of connecting treatment device wire
Shorting
Flexible cable
KSM-900AAH
Sub board
(Reverse side)
First short-circuit the pickup circuit before removing the pickup.Then carry out the replacement.
Refer to "Dismantling and assembling the traverse unit" on page 1-5.
When the KSM-900AAH mechanism is used, the expansion cable is used as follows.
EXTFSSD5-JIG
extension wire
QUQB12-0840CJ
8pin card wire
QUQB12-0940DJ
9pin card wire
QUQB12-1840DJ
18pin card wire
QUQB12-1640DJ
16pin card wire
EXTKSM900-JIG
Sub board

FS-SD550R/FS-SD770R/FS-SD990R
1-18
BD3861FS-X (IC501) : Audio sound control
1. Pin layout
2. Block diagram
3. Pin function
0dB~
-70dB
Vcc/2 Vcc/2
Vcc/2
Vcc/2
Vcc/2
Vcc/2
Treble1
f0=10kHz Treble2 f0=10kHz
Middle2
f0=1kHz Middle1 f0=1kHz Bass1
f0=90Hz Bass2 f0=90Hz
0dB~
-59dB 0dB~ -59dB
Vcc/2
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
25k
100k
12k
24k
Vcc/2
Vcc/2 Logic
Vcc/2
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
12345678910111213141516
117
32 18
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
A1
A2
B1
B2
C1
C2
D1
D2
E1
E2
MIC
FIL
GND
DATA
CLK
Vcc
OUT2
BASS21
BASS22
OUT1
BASS11
BASS12
MID11
MID12
MID21
MID22
TRE2
TRE1
VOL1
VOL2
GOUT2
GOUT1
CH1 input pin A
CH2 input pin A
CH1 input pin B
CH2 input pin B
CH1 input pin C
CH2 input pin C
CH1 input pin D
CH2 input pin D
CH1 input pin E
CH2 input pin E
Microphone input pin
Filter pin
Ground pin
Serial data latch receiving pin
Serial clock receiving pin
Power supply pin
CH2 output pin
CH2 bass filter setting pin
CH2 bass filter setting pin
CH1 output pin
CH1 bass filter setting pin
CH1 bass filter setting pin
CH1 middle filter setting pin
CH1 middle filter setting pin
CH2 middle filter setting pin
CH2 middle filter setting pin
CH2 treble filter setting pin
CH1 treble filter setting pin
CH1 input volume input pin
CH2 input volume input pin
CH2 input gain output pin
CH1 input gain output pin
Pin
No.
Symbol SymbolFunction Function
Description of major ICs

FS-SD550R/FS-SD770R/FS-SD990R
1-19
24 23 22 21 20 19 Gnd 18 17 16 15 14 13
7 8 9101112
Gnd
123456
Level
shift B T L
driver
Level
shift B T L
driver
B T L
driver
11k
ohm
11k
ohm
Level
shift
B T L
driver Level
shift
Regulator
RESET
11k
ohm
11k
ohm
- +
- +
Vcc
Vcc Vref Vin4 Vg4 Vo8 Vo7
Vcc Mute Vin1 Vg1 Vo1 Vo2 Vo3 Vo4 Vg2 Vin2 Reg
out Reg In
Vo6 Vo5 Vg3 Vin3 Cd Res
LA6541-X(IC602) : Servo Driver
1. Pin Layout & Block Diagram
2. Pin functions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Vcc
Mute
Vin1
Vg1
Vo1
Vo2
Vo3
Vo4
Vg2
Vin2
Reg Out
Reg In
Res
Cd
Vin3
Vg3
Vo5
Vo6
Vo7
Vo8
Vg4
Vin4
Vref
Vcc
Power supply (Shorted to pin 24)
All BTL amplifier outputs ON/OFF
BTL AMP 1 input pin
BTL AMP 1 input pin (For gain adjustment)
BTL AMP 1 input pin (Non inverting side)
BTL AMP 1 input pin (Inverting side)
BTL AMP 2 input pin (Inverting side)
BTL AMP 2 input pin (Non inverting side)
BTL AMP 2 input pin (For gain adjustment)
BTL AMP 2 input pin
External transistor collector (PNP) connection. 5V power supply output
External transistor (PNP) base connection
Reset output
Reset output delay time setting (Capacitor connected externally)
BTL AMP 3 input pin
BTL AMP 3 input pin (For gain adjustment)
BTL AMP 3 output pin (Non inverting side)
BTL AMP 3 output pin (Inverting side)
BTL AMP 4 output pin (Inverting side)
BTL AMP 4 output pin (Non inverting side)
BTL AMP 4 output pin (For gain adjustment)
BTL AMP 4 output pin
Level shift circuit's reference voltage application
Power supply (Shorted to pin 1)
Pin
No. Symbol Function

FS-SD550R/FS-SD770R/FS-SD990R
1-20
UPD780024AGKB19 (IC701) : CPU
1. Pin layout
2. Block diagram
1
16
48
33
64 ~ 49
17 ~ 32
~ ~
78K/0
CPU
CORE
ROM
(32K
BYTE)
RAM
(1024
BYTE)
16-bitTIMER/
EVENT COUNTER
8-bitTIMER/
EVENT COUNTER50
PORT0
PORT1
PORT2
PORT3
PORT4
PORT5
PORT6
PORT7
EXTERNAL
ACCESS
SYSTEM
CONTROL
8-bitTIMER/
EVENT COUNTER51
SERIAL
INTERFACE30
SERIAL
INTERFACE31
UART0
INTERRUPT
CONTROL
A/D CONVERTER
VDD0 VDD1 Vss0 Vss1 IC
BUZZER OUTPUT
CLOCK OUTPUT
CONTROL
WATCHDOGTIMER
WATCHTIMER