Samsung RCD-1230 User manual

SERVICE
MANUAL
RCD -1230
SPECIFICATION
GENERAL
Frequency response
Speaker
Maximum output
Power source
Power consumption
Dimension
Weight
Headphone jack
RADIO
Frequency range
LF
Antenna
: 20~20000Hz
: Woofer :@ 100mm x 2(4 W)
: 2W(DC)/CH
: AC : See label rating
DC : 9V (Dx 6)
: 14W
: 560(W)X213(D)X180(H)mm
: 3.4Kg (Without batteries)
: g 3.5mm
FM : 88~108MHz
AM : 530~1705KHz(OPTION)
530~1605KHz
LW : 150~285KHz(OPTION)
SW : 6~18MHz(OPTION)
FM : 10.7MHz
FM : Telescopic rod antenna
AM : Ferrite bar antenna
TAPE
Track system
Recording system
Erasing system
Monitor system
Frequency response
Tape speed
Tape drive system
Tape loading system
Motor system
Signal to Noise Ratio
Separation
Total Harmonic Distortion
COMPACT DISC PLAYER
Frequency range
Signal to Noise ratio
THD
D/A Conversion
Design and specifications are subject to change upon improvement without prior notice.
4 track 2 channel
AC bias (DECK A)
Magnetic erasing (DECK A)
Variable monitor
Normal 50~10000Hz
CrO2/METAL (PB)
4.75cm/sec (Normal speed)
9.5cm/sec (High speed)
Capstan belt driven
Front loading
DC synchronous
2 speed motor (DC 9V)
40 dB
35 dB
2%
20 ~ 20,000Hz
82 dB (at 1KHz) with filter
0.1%
(at 1KHz with 30KHz L.P.F)
16 bits

CONTENTS
etal
MR
SSAPE
EY
PRECAUTION
oa
osstecses
bisesasectrscss
ahensasinceyscasceda
aqua
hoyasoasausdoada
host
Seals
aashanagsea
tay
abasic
ee
cheesiest
0.
9
MM
S
SERVICING
NOTE
i
osackencnsciassaseioses
cea
zenastus
adap
cuas
tas
chal
uusavhad
es
dadscak
oot
cat
aceaa
eivosvu
nd
ovaseareuad
acca
ea
Stan
ein
ea
Neceed
3
ME”
SOGATION-OF
CON
TROUG
x
ssocssesstosesntsinaso
sux
aases
ates
csceencns
td
ots
cues
cacausotut
ugceaauseeasencs
eatin
dec
sax
ated
vtaaduasa
aK
oases
4
MI
DISASSEMBLY
INSTRUCTION
.......cssscssccsssccsscasssssssassccnseessossneusoussesvsseussessesssseessuvscutsoneesunseeneesasenecsasesusetussesavtstasertetsmsenseccesss
6
M
DESCRIPTION
OF
LCD
SEGMENTS
.......0....ccscsscsssssssseecssessssssssssesssecsussssessuesssesasecsesasesasessesuassussussucsssssasessstessesessesescesecesees
8
HM
TROUBLE
SHOOTING
CHART
.......scsscssscesssscssssssscsessoeresesnsesnesusnercasenescossorssscsorscuecnecasansensessesussossesostassessestsesseusetosarseseseoseosoess
9
MB
DIES
VME
D
vec
censtce
basco
viva
encen
ens
Breck
Dens
tpdyotlvau
sane
aaou
tabs
bcasursoa
ashe
asda
esed
nc
eats
to
susdts
Ces
vaw
anes
decd
e
ancbeeestegcttee
17
1. MAIN & TUNER ADJUSTMENT
2. CD ADJUSTMENT
EC,
NBT
DAY
QUI
cach
cs
tuts
co
dovnavtavasakas
ceccbudaatentpDeaaueate
site
eed.go
dimes
ny
itdaas
ee
abouts
ues
Rose
20
EOC
IE
EAGAN
ces
ccccoiuahaecstiiacte
ceases
acevo
cha
seeecete
tec
etasl
da
cacast
cu
stcnedSucaaulatcdedssadgn
ion
ta
OS-extasadkadeots
alee
ba
24
SCHEMATIC
DUA
GEA
siuctscsacactscs
canis
cays
peed
tebe
sue
boubasaidzedesactieh
sp
cc
b.ih
cas
ede
ogudir
ves
buva
ati
zeecdubds
atta
cde
aadetbautdaeeamaeeseeae
26
PCB
PATTERN
AND
MARKING
DIAGRAM
..........csccssssssssccssssseesssssesssesesesonesssssssessuesussavecsuseuscassatenscsusssscssscessuessseseececseveneees
28
MV
TRENG
DEA
GUAM
iisseies
fsck
a0sescaeasson
cada
ecnann
ntdu
edgvl
deuce
cheat
asdicazccans
scl
savstaitaodlgable
Bes
dueasecSvaedeccuss
daviclactexadioctissetnanes
30
CB:DECK
EXPLODED:
VIEW
cscsvevriisciasivacsassestacacutesvstvcsscecinatutsdlihciuagasdaiisouaala
avec
danoudedeunipeeounccaevln
'vove'vbacaceubessaesiosicancetuoas
ted
32
SD
BACI
PAE
TS
EUS
Dis
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te
siccusde
cst
tagdcipeevectssce
teste
qahitsnasvasvevaastanenitseaaunvtaysdeuanskaborshadods
Mag
teldeacinia
Gcaetel
dado
dé
tee
32
EXPLODED:
VIEW
oie
cnenseseusassuacananacsastapanavibnshashnashesuouoauseucdbdsyntadivncai2usOshateisus
nstasiuovetedbindea
sosdvucesadeaderteanesaieeriwota
desaseensdeasac
33

m
SAFETY
PRECAUTION
|
a:
1. CLASS 1 LASER PRODUCT
This
compact
disc
player
is
classified
as
a
CLASS
1
laser
product.
2. LASER WARNING LABEL
The
label
shown
below
may
be
affixed
or
not
according
to
country.
s
(UL)
(CSA)
(EU)
CERTIFIED ONLY TO CANADIAN
This Product Compiles with
ELECTRICAL CODE. CLASS1
DHHS Rules 21CFR, Sub
chapter J.At date of Manu-
CERTIFIE
EN
VERTU
DU
CODE
LASER
PRODUCT
CANADIAN
DE
LELETRICITE
SEULEMENT
facture.
sy
Location : Enclosure back.
(SCAN)
(EU)
UL : Manufactured for U.S.A Market.
CSA: Manufactured for Canadian Market.
EU __: Manufactured for European Market.
SCAN : Manufactured for Scandinavian Market.
ADVARSEL : USYNLIG LASER-
STRALING VED AB8NING,NAR
SIKKERHEDSAFBRYDERE ER
UDE AF FUNKTION UNDGA
UDSAETTELSE FOR STRALING.
Location
:
on
the
disc
clamper
or
inner
side
of
CD
door
or
nearby
CD
chassis.
3. LASER BEAM WARNING
ADVERSEL
—
USYNLIG
LASERSTRALING
VED
ABNING,
NAR
SIKKERHEDSAFBRYDERE
ER
UDE
AF
FUNKTION.
=
UNDGA
UDSAETTELSE
FOR
STRALING.
VARNING
—
OSYNLIG
LASERSTRALNING
NAR
DENNA
DELAR
OPPNAD
OCH
SPARR
AR
URKOPPLAD.
STRALEN
AR
FARLIG.
VARITUS
—
LAITE
SISALTAA
LASERDIODIN,
JOKA
LAHETTAA
NAKYMATONTA
SILMILLE
VAARALLISTA
LASERSATEILYA
CAUTION
—
INVISIBLE
LASER
RADIATION
WHEN
OPEN
AND
INTERLOCKS
DEFEATED.
AVOID
EXPOSURE
TO
BEAM.
4.
LASER
DIODE
SPECIFICATION
(OPTICAL
PICK-UP)
ee
®
Material
:
AlGaAs
=
@
Wavelength
:
760-800nm
®
Emission
duration
:
Continuous
®
Laser
Output
:
0.2mW
@
*
This
output
is
the
value
measured
at
distance
1.6mm
from
the
objective
lens
surface
on
the
optical
pick-up
block.
® Classification : CLASS 1
. WARNING FOR SERVICING
WARNING:
When
servicing,
do
not
approach
the
LASER
exit
with
the
eye
too
closely.
In
case
it
is
necessary
to
confirm
LASER
beam
emission,
be
sure
to
observe
from
a
distance
of
more
than
30cm
from
the
surface
of
the
objective
lens
on
the
optical
pick-up
block.
VARNING
:
Nar
underhaliningsarbeten
utférs,
narma
dig
forsiktigt
och
se
inte
pa
laserutstralningen
pa
f6r
nare
hall.
Ifall
det
ar
néddvandigt
att
betrygga
laserstralens
utstr6mning.
Var
saker
att
kontrollera
detta
fran
ett
avstand
av
mer
An
30cm
(11.81
inch.)
fran
den
objecktiva
linsens
yta
pa
den
optiska
utsandningspunkten.
ADVARSEL
:
Nar
repareringsarbejdet
udfoeres,
naerm
dig
forsigtigt
og
se
ikke
pa
laserudstralingen
pa
for
naer
hand.
It
ilfaeldet
at
det
er
noedvaendigt
at
bestemme
laserstralens
udstraling.
Vaer
sikker
pa
kontrollere
dette
fra
en
afstand
af
mere
end
30cm
(11.81
inch.)
fra
den
objektive
linses
overflade
pa
den
optiske
eS
udsendningspunkt.
VAROITUS
:
Silmia
on
varottava
viemasta
liian
labeiie
Laser-poistokanavaa
huoiion
aikana.
Jos
on
valttamaténta
varmistaa
Laser-Sateen
paastd,
pusyttels
sita
tarkasteltaessa
vahintaan
30cm
etaiyydella
optisen
lukon
objecktiivilinssin
pinnasta.
an

m SERVICING NOTE
Disconnect power supply.cord before separating cabinet for servicing as you may experience an electric shock.
Avoid repairing under direct sunshine and heat which may cause cabinet, transistor and IC to be transformed or misoperate.
Use a soft cotton swab moistened with warm water or neutral cleaner when parts of a unit need to be cleaned.
When replacing parts with safety features built in, be sure to use specified parts with same specifications only.
Avoid repairing the set near a TV or any other magnetic forces.
Disconnect the plug from wall socket during electric storm to reduce the risk of damage.
Be careful of electrostatic damage when replacing the control [C such as p-COM, LSI and pick-up.
Be sure not to separate the pick-up from the unit and not to touch the ALPC (Automatic Laser Power Control) circuit.
BNAARWON >
HANDLING THE OPTICAL PICK-UP
“ The laser diode in the optical pick up may suffer electrostatic breakdown because of potential static electricity from clothing
and your body.
The following method is recommended.
Place a conductive sheet on the workbench. (The black sheet used as wrapping for repair parts.)
Place the set on the conductive sheet so that the chassis is grounded to the sheet.
Place your hands on the conductive sheet. (This gives them the same ground as the sheet.)
Remove the optical pick up block.
Perform work on top of the conductive sheet.
Be careful not to let your clothes or any other static sources touch the unit.
“Pons
»
Be sure to put on a wrist-strap grounded to the sheet.
* Be sure to lay a conductive sheet made of copper etc. which is grounded to the table. :
> @) Wrist-strap
6
|
for
grounding
The unit
@ Conductive sheet

m@ LOCATION OF CONTROLS
1. FRONT PANEL
Peles see
12
15
16 17 14
SHUFFLE || |PROGRAM
12
1
INTRO
3. CD OPERATION LCD
2. REAR PANEL

1. FRONT PANEL 2. REAR PANEL
1. HEADPHONE JACK 18. BATTERY COMPARTMENT
2. VOLUME CONTROL 19. AC IN ~ SOCKET (MOUNTED ON SIDE)
3. TONE CONTROL
4. TAPE SEL BUTTON (CrO2 PB/NORMAL)/
MODE (FM-MONO/FM-STEREO)/ 3. CD OPERATION LCD
BEAT CUT BUTTON 1. INTRO INDICATOR
5. FUNCTION SELECTOR 2. SHUFFLE INDICATOR
(TAPE,RADIO OFF/CD/RADIO) 3. PROGRAM INDICATOR
DUBBING SPEED (NOR/HIGH) 4. REPEAT,ALL INDICATOR
6. TELESCOPIC ANTENNA 5. SYNC INDICATOR
7. HANDLE 6. PAUSE INDICATOR
8. CD DOOR 7. PLAY INDICATOR
9. PUSH OPEN BUTTON (CD) 8. TRACK NUMBER INDICATOR
10. BAND SELECTOR (FM/AM) 9. TIME INDICATOR
11. TUNING KNOB
12. SPEAKER (L,R)
13. CD OPERATION LCD
14. DECK OPERATION BUTTONS
RECORD BUTTON (DECK A ONLY)
PLAY BUTTON
REW BUTTON
F.FWD BUTTON
STOP/EJECT BUTTON
PAUSE BUTTON
15. CD OPERATION BUTTONS
SKIP & SEARCH ( I<, »bI ) BUTTON
PROGRAM BUTTON
MODE BUTTON
STOP BUTTON
PLAY/PAUSE BUTTON )
16. POWER INDICATOR
17. FM STEREO INDICATOR

Mi
DISASSEMBLY
INSTRUCTION
e
Be
sure
to
unplug
power
cord
and
remove
batteries
before
disassembling
the
unit.
CABINET
REAR CABINET
FRONT CABINET
POWER PCB TUNING ASS'Y
MAIN PCB
TAPE-DECK ASS'Y
CD PACK ASS'Y
1. CABINET (FRONT/REAR)
1) Release 7 screws (1)
@ 2) Split Front and Back cabinet
2. TUNING ASSEMBLY
1) Release 2 screws (2)
2) Remove tuning assembly

3. CASSETTE DECK ASSEMBLY
1) Retease 6 screws © from the Front Cabinet.
2) Remove cassette deck assembly.
Front Cabinet
4.
CD
PACK
ASSEMBLY
&
MAIN
PCB
1)
Release
2
screws
:
2)
Remove
CD
pack
assembly
from
the
Back
cabine
3)
Release
9
screws
4)
Remove
main
PCB.
5. TUNER PCB
1) Release 4 screws © .
2) Remove Tuner PCB.
fom

m
DESCRIPTION
OF
LCD
SEGMENTS
If
one
or
all
of
the
LCD
Segments
(see
segment
diagram
below)
don't
work,
check
if
IC7530
and
LCD
pins
are
properly
connected refering to the chart below.
iInTRo | [ SHUFELE ] [PRoeRAN] [RaPEar] Laut ]
()
(] »
|
|
|
|
|
|
J

m@ TROUBLE SHOOTING CHART
1. RADIO CASSETTE SECTION
1) AC POWER INSENSIBLE
Xx
Check AC Cord Connection Replace AC Cord
O
Check setting of voltage
selector Switch
O
Check Fuse(OPTION)
Check DIODE RD701
RD704 (Power PCB)
Check Voltage of CW5
(Main PCB)
Check if LED lights
(Radio)
X
Replace Fuse
Replace DIODE Rectifier.
Check connection of CW5
and soldering
Check LED defect &
Soldering
2) BATTERY POWER INSENSIBLE
Check
Proper
Polarity
Install
battery
Properly
oO
X
Check if AC cord is plugged in set Unplug
O
Check Voltage of CW1
(Power PCB)
1. Check if Battery Spring Wire is cut.
2. Check battery contacts.
3. Check proper polarity positioning.
wt
A a ie te a it ac ie ies

3) NO AUDIO OUTPUT
Check if Power LED lights Refer to "BATTERY POWER INSENSIBLE"
~<
oO
X
Check Speaker Wire Connection Connect Speaker Wires Properly.
oO
<¢
xX
Check if Volume is Set to
the lowest
2
Replace RQ801 or RZD1
Check Voltage of Power
IC (IC 601) pins
Replace IC
x Check signals (patterns)
from Volume input going to
IC601
Check Output at
AC604 ORAC654
—10—

4) RECORDING NOT WORKING
Check Rec Leaf Switch Contact
Make leaf switch contact good
—T
A,
Connect Properly
Check Connection of CW4 connectors
Check Power Supply and Circuitry
Check Connection
of signal Line
Check signal at !C301
REC input.
fr,
Check voltage at all ports
supplied from REC switch.
5)
COMPACT
DISC
INOPERATIVE
€
.
Check FUNCTION Setting
‘ =
X
X
|
Check
if
LCD
lights
No
light
Check
Leaf
Switch
of
CD
door
-
.
?
X
;
xX
Check
Disc
Rotation
Check
Voltage
at
emitter
of
RQ802
Replace
PR818
or
RR802
Check Wire Connection of X Check Connection CW5 to
“CW5 Function Switch
rey
FE
<4
| Make CD pack adjustment
iN
f=

Se
oe
6) TAPE NOT WORKING
Contact Properly
Check Output of Deck A,B
Insensible
Completely
DECK
A
INOPERATIVE
Check Connection of
CW6 wires
Check Connection
Emitter of Q801 line
Replace IC
Deck B leaf Switch
not Contact Properly
Connect Properly
Check Voltage at IC 301 pins
Check Connections from MAIN AMP
Output through Function Switch
Open Record Switch
Record Switch not
contact Properly
Check wire Connection
of Head
DECK B INOPERATIVE
Check Voltage
Supply Circuitry
Check Wire Connection to
a4 oes

7) RADIO INSENSIBLE
Radio not Heard
Completely
APY
Check Connection
of Tuner Bt fine.
Check Voltage at
pin 6 of IC 101
Replace IC 101
Check Voltage at pins of
1C101
Check Output of pin 13,14 of IC 101
Check Connection
of Signal Line
FM
INSENSIBLE
AM
INSENSIBLE
€
Check Noise Check Noise
Check Voltage
at IC 1 pin 16.
Check Voltage
at IC pin 16.
Connect Wire to TP 1
Check IF and
Tracking Adjustment
Check Connection of
Rod Antenna
Fan
Check IF and Tracking
Adjustment

2. CD SECTION
* Refer to Schematic Diagram
1) POWER NOT SENSIBLE
Connect AC cord
Check AC
cord con-
nection
Check CD
Power source
Check CD
power supply
(main PCB)
Check 5V pattern
and GND short
Check output at
PIN 6 of IC6296
(5V)
2) LEAD-IN NOT WORKING
Check DSP soldering
(IC5990)
Check waveform of DSP
pin 23, 24, 25
Check SSP
soldering (IC8309)
Check soldering of
RF AMP (iC 9201)
Check F. Bias (VR 1703)
adjustment
Check E.F Balance
adjustment (VR1701)
a ae ire ali

3) DISC NOT ROTATING
Oo
Check voltage at pin 33
of IC 7530 (high > low)
O
0
Check focusing
Check laser (on)
Check voltage at
pin23 of IC 7530
(high)
ny" "Lu"
Check voltage at
pin35 of IC 8309
(SV)
Check voltage of
"SP +", "SP -" of IC 6296
Check voltage at pin 14
of IC 8309
Check oscillation of
IC 5990 (16MHz)
Check voltage at pin 5
of [C 9201
Check soldering of
pick-up laser diode
Check soldering of "FOK"
of IC 8309, IC9201
ae
Check soldering and
pattern of Q 1701
Replace pick up
#
yaN

fs
aN
4) NO AUDIO
O
Xx
Check waveform at ae Check DSP power supply Replace DSP (IC 5990)
pin76 ~ 80 of iC 5990 and pin short
;
X
xX
Check
signal
of
Check
power
supply
of
IC
0316
and
Replace
IC
pin 1,20 of IC 0316
IC pin short
Check signal at pin2,19 X Check voltage at pin 4
of IC 9270
of IC 9270
Oo
Replace IC 9270
5) DISPLAY NOT WORKING
Check door leaf switch
Check soldering on pin 26
of !C 7530
Check XF 1702 (4MHz)
Check power supply of IC 7530
Replace IC
Check voltage at pin 7
(LCD bias) IC 7530
_ (VY)
Check soldering of Q2000, R3334, C2221, C2230
Check voltage at Q 2000
(reset transistor)
—16—

Mi ADJUSTMENT
e INSTRUMENTS AND TOOLS
. AM STANDARD SIGNAL GENERATOR
. FM STANDARD SIGNAL GENERATOR
. FM/AM IF GENERATOR: 10.7MHZ, 45SKHZ (465KHZ).
. OSCILLOSCOPE
OUTPUT METER: LEVEL METER OR AC VOLTMETER.
LOOP ANTENNA
. DUMMY LOAD (4 ohm)
. SW DUMMY ANT.
. FREQUENCY COUNTER
. FM STEREO MODULATOR
e IMPORTANT
SOOODNANAWND= _
. Check the power source voltage.
. Select desired Band and Function.
. Set Tone Control at mid position
.
Modulate
AM
to
30%
amplitude
with
400Hz
signal
and
FM
to
22.5KHz
deviation
with
400Hz
signal.
é
.
Set
Volume
Control
to
approximately
50mW
(4ohm)
nh OM —
{7

MAIN & TUNER ADJUSTMENT
[FM COVER ADUUSTMENT) FM TK’ ADVUSTMENT | [ANIVW) COVER ADJUST) [ANIPAT TRA” ACVUST’ | (LN COVER. ADJUSTMENT] LW TRA” ADJUSTHET
| MAX’ QUTPUTIEIG.S) | | MAX’ OUTPUTIFIG.S) MAX’ OUTPUTIFIG.5} | | MAX’ QUTPUTIFIG.5) MAX’ QUTPUTFIG.5] MAX’ OUTPUT (FIG.5)
: 87.3 MHz| 108.3 MHz] | 90 MHz_| 106 MHz 515 KHz ie WEBI} ~=— | 600 KHz | 1400 KHz 145 KHz | 295 KHz | [170 KHz | 270KH2
FL2 FOV NOT required] FCV2 aoa (650 Kee [ L103 | Feva FTi02 | FCT6 Li02__| FCT
4 enor aa, | FOV | ag
ANIMA) IF ADJUST
MAX’ OUTPUT (FIG.41
455 KHz
FT2
LOOP_ANT
DIGIMARSCOPE
K
Oo
bee [
(FIG.4)
[
)
|
TI
| SW COVER ADJUSTMENT |
|
MAX’
OUTPUTIFIC.S)
|
5.7 MHz | 18.5 MHz |
Fil | FCT |
J
7 i
| (STR ADSTENT
MAX” OUTPUTIFIG.S) |
[7 Mz | 15 Miz
| L101 | NOT required
)
(FIG.3)
LOOP. ANT
55.6
OSCILLO
Oe
a
ae
—
ee
ADJUSTMENT
SFREUENGY.
COUNTER
VM
SCOPE
V.T.V.M SCOPE — 8FREQUENCY COUNTER
=
insert
iape
into
DECK
A
and
RECORD
BIAS
ADJUSTMENT
R/P
Head
=
HEAD
AT
22ST
2
ane
PP 3000 Hz adjust tach! Cor Q0Hz leading on 52 KHz Press “RECORD” button of DECK A justment for maximum output an
DUMMY
(4ohm]
J
a
FREQUENCY
COUNTER
[FIG.{)
nd
adjustment
for
a
S2kHz
leading
riven
scacy
|
for
the
same
channel
phase
DUMMY
(4ohm
|
CP
(FIG.31 L
|
3
6
5
TEST TAPE
|
MIT-Itt
|__|
fon
FREQUENCY
COUNTER
(FIG.2)
I
-
;
“Hh
Lo
o7—49
Lt
We
oI
6
ADJ’
PARTS
|
JSVi
=
So)
AOI
PARTS
|
JiS0
16.3)
TEST
TAPE
MIT-1130N(8KH2
?
©
o
ADJ’
RANGE
|
2910-3010Hz
(FIG)
ADJ’
RANGE
|
52
KHz
'
ADJ’
PARTS
[A.B
DECK
screw
|
|
:
FIG.5)
cee
rnin
18

2. CD ADJUSTMENT
1) CLV ADJUSTMENT
10: 1 damping probe.
A. Turn power on without loading a disc.
B. Connect S2 (Asymetry ; short)
C. Connect TP10 to GND and TP2 to positive terminal on the Frequency Counter.
D. Adjust VR 1702 so that the Frequency Counter reads 4.28MHz + (0.01MHz)
E. Disconnect S2.
2) EF BALANCE ADJUSTMENT (Power On)
A. Set Oscilloscope Time/Div to 2mS.
B. Set Oscilloscope Volt/Div to 0.5V.
C. Connect TP1 (Vref) to GND and TP4 (T.G) to positive terminal on the oscilloscope.
D. Press PLAY with loading a disc.
E. Adjust VR1704 all the way counter clockwise. (Intermittent sound)
F. Adjust VR1701 so that the waveform is equally symmetrical refer to waveform below.
G. Adjust VR1704 so that Sound comes out normally (Nearly mid-position of VR1704).
A=B VR1701
_ 3) FOCUS BIAS ADJUSTMENT
A. Turn power on without loading a disc.
B. Set Oscilloscope Vol/Div to 0.1 Vdc
C. Connect TP1 (Vref) to GND and TP3 (F.G) to positive terminal on the oscilloscope.
D. Adjust VR1703 so that the voltage is 0 mV DC on the oscilloscope.
4) TRACKING GAIN ADJUSTMENT (Power On)
A. Connect TP1 (Vref) to GND and TP4 (T.G) to positive terminal on the oscilloscope.
B. Press PLAY with loading a disc.
C. Adjust VR1704 so that Waveform is as shown in the figure below.
(NORMAL WAVEFORM) (LOW TRACKING GAIN)
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a2 vow Paci
VOLT/DIV : 0.2V
TIME/DIV : 2mS
VOLT/DIV : 0.2V
TIME/DIV : 2mS
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VR1702
VR1703
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VR1704
(HIGH TRACKING GAIN)
VOLT/DIV : 0.2V
TIME/DIV : 2mS
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5) FOCUS GAIN ADJUSTMENT (Power ON)
A. Connect TP1 (Vref) to GND and TP3 (F.G) to positive terminal on the oscilloscope.
B. Press PLAY with loading a disc.
C. Adjust VR1705 so that the waveform is as shown in the figure below.
(NORMAL WAVEFORM)
(LOW FOCUS GAIN)
Re
VOLT/DIV : 0.1V VOLT/DIV :0.1V
TIME/DIV : 2mS TIME/DIV : 2mS
VR1705
(HIGH FOUCS GAIN)
VOLT/DIV : 0.1V
TIME/DIV : 2mS
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