Teac VRDS-25 User manual

VRDS-25
TEAC
SERVICE MANUAL
Compact Disc Player
COMPACT
DIGITAL AUDIO
CONTENTS AR
q SAFETY INFORMATION eee eee ecereserer reece eneenrereeereeneee 2
2 SPECIFICATIONS +e ceceececrc eee ceeceeeseceee eee eseeeteeseeneesens 3
tt
3 ADJUSTMENT AND CHECKS Prrrrrerrererrr Terre crererer er eis 4
BA aS + HEED
4 EXPLODED VIEWS AND PARTS LIST -+-:--21:seeeseeeee ee 10
SEBEL IN YU Rb
5 PC BOARDS AND PARTS LIST eo 0e00 0 OO ete s 600060 6.00 sense cee 18
BipBléN-yYuUA
/ 6 INCLUDED ACCESSORIES C0.6.0050, 9i0. 8.0 $046 WE 00 VO O8' ee 50 SOs Se eee 23
*tigan
Effective : December, 1995

| VRDS-25 |
! 1 SAFETY INFORMATION
| SAFETY INFORMATION
This product has been designed and manufactured according to FDA regulations “title 21, CFR, chapter 1, subchapter J, based on the
| Radiation Control for Health and Safety Act of 1968”, and is classified as class 1 Jaser product. There is not hazardous invisible laser radiation
during operation because invisible laser radiation emitted inside of this product is completely confined in the protective housings.
The label required in this regulation is shown ()
i CAUTION
USE OF CONTROLS OR ADJUSTMENT OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN
HAZARDOUS RADIATION EXPOSURE.
CERTIFICATION
THIS PRODUCT COMPLIES WITH DHHS
RULES 21 CFA SUBCHAPTER J APPLI-
CABLE AT DATE OF MANUFACTURE
TEAC CORPORATION
DP.SNAKA-CHO MUSASHINO-SH1 TOKYO JAPAN
MANUS ACTURED ™
Pennaeae! VeeNeen (Seva ener cnn
oe peat heme
Optical pickup: Type : KSS-151A
Manufacturer : SONY Corporation
Laser output : Less than 0.2 mW on the objective lens
Wavelength :760 — 800 nm
e CAUTION eACHTUNG ¢OBSERVERA e¢ ADVARSEL
@ THIS LABEL 1S ATTACHED TO THE PLACE AS ILLUSTRATED TO INFORM
THAT THE APPARATUS CONTAINS A LASER COMPONENT.
: LASER RADIATION WHEN OPEN AND
INYERLOCKS pera’ ‘AOI EXPOSURE TO BEAM
VORSICHT! UNSICHTBARE LASEAGTRAMLUNG TRITY AUS
Wen DecKeL GeOFFNET UNO WEN
GHEITSVERRIE GELUNG GoERarUCKt 1st
NCHT DEM STRAHL AUSSET
* QSYNUG LASERSTRALUNG NAR DENNA DEL
STRALEN AR TAR
@ DIESE AUFKLEBEMARKE IST AN DEM IN DER ABBILDUNG GEZEIGTEN ORT
ANGEBRACHT UM DARAUF HINZUWEISEN, DASS IM INNERN DES GERATS
EINE LASER-KOMPONENTE BEFINDET.
Ser ARNT Or, PEE INES STE LO FEAR a Pe aC Ie CONE EORTC TEM Fe UTED BERTONE De NS OE
(@ PASKRIFTEN SITTER PA APPARATEN SOM VISAS SOM UPPMANING OM ATT
APPARATEN OMFATTAR EN INBYGGD LASERKOMPONENT.
ADVARSEL - USYNLIG LASERSTRALING VEO ABNING NAR
‘SIKKERMEOSAFBAVDERE EA UDE AF FUNKTION
SROGA VOSATTELSE POA STRALRG
SAITO GAC LARDTELON Et SAA AOS UATE SRA
VASE: LAHETTAA (MAK YMATONTAS
SRMCLe WAAAMUISTA LASEOSATELYA
ADVARSEL + USYNLG LASERGESTRALING NAR DENNE OGLEN ER
APEN OG SIKKERMETSSPERREN ER UTRORLET
UANGA UTSETTELSE FOR STRAY
(@ DETTE M/ERKAT ER ANBRAGT SOM VIST | ILLUSTRATIONEN FOR AT ADVARE
BRUGEREN OM AT APPARATET INDEHOLDER EN LASERKOMPONENT.
@ DETTE M/ERKAT ER SOM VIST PA ILLUSTRATIONEN ANBRAGT PA
INDERSIDEN AF TOPDA-KSLET FOR AT ADVARE BRUGEREN OM AT
YDERLIGERE FREMTR/AENGEN VIL VAERE FORBUNDET MED FARE FOR AT
UDSAETTE SIG FOR LASERSTRALING.
ADVARSEL- BETJENING AF ANDRE KONTROLLER OG REGULATORER ELLER
BENYTTELSE AF ANDRE FREMGANGSMADER END BESKREVET HERI ER
FORBUNDET MED FARE FOR USDA:TTELSE FOR LASERSTRALING.
VARNIG: APPARATEN. INNEHALLER LASER KOMPONENT MED
STRALNING.OVERSTIGANDE KLASS 1
“ADVARSEL: USYNLIG LASERSTRALING VED ABNING NAR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGA
UDSAETTELSE FOR STRALING.”
“VAROITUS! SUOJAKOTELOA EI SAA AVATA, LAITE SISALTAA
LASERDIODIN. JOKA LAHETTAA (NAKYMATONTA) SILMILLE
VAARALLISTA LASERSATEILYA’.
ADVARSEL: USYNLIG LASERBESTRALING NAR DENNE
DELEN ER APEN OG SIKKERHETSSPERREN ER UTKOBLET
UNNGA UTSETTELSE FOR STRALING.
i
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CLASS 1 LASER PRODUCT
LUOKAN 1 LASERLAITE
KLASS 1 LASERAPPARAT
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| VRDS-25
2 SPECIFICATIONS
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AUDIO (A-F 4 4)
Number
of
Channels
2
A-FA
AF
vr
VAN
2Fe
VRID
Frequency
Response
1
—
20,000Hz
+
0.3dB
(RCA)
ARBRE
1~20,000Hz
+
0.3dB
(RCA)
20 — 20,000Hz + 0.3dB (XLR) 20~20,000Hz + 0.3dB (XLR)
Signal
to
Noise
Ratio
Better
than
110dB
(1kHz)
SN
Et
110dB
LE
(EIAJ)
Dynamic
Range
Better
than
99dB
(1kHz)
PAF
RE
9IV
YY
Q9dB
£LECEIAJ)
Harmonic
Distortion
0.0015%
(ikHz)
aaRER
0.0015
%EL
F
(EIAJ)
Wow
and
Flutter
Unmeasurable
(Quartz
accuracy)
DIVIVI—
AE
RR
FAB
OK
IRE
Channel
Separation
Better
than
108dB
(1kHz)
Fe
VRIES
L-Yav
108dBELECEIAJ)
Output
Analog
2.2Vrms
(RCA)
PFOTHA
2.2Vrms
(RCA)
2.2Vrms
(XLR)
2.2Vrms
(XLR)
Digital
0.5Vp-p/
75
Q
(Coaxial)
FIUINAD
0.5V
p-p/
75
Q
(COAXIAL)
-
15dBm
—-21dBm
(Optical)
—
15~-
21dBm
(OPTICAL)
D/A
Converter
1/16
shift
20
bit
4
DAC
DSAIYIN-J—
1/16Y7bk20Ey
-
4DAC
Digital
Filter
8-times
oversampling
25-bit
digital
FVIND
«AW
8HA-IN-tU
TUT
filter 2eEykFYINWI ANI
Analog
Filter
3rd
order
Butterworth
filter
PIFOAI
ANI
SRNG-D-RAID4
NWI
PICK UP (Ex I Pu)
Type
Objective
lens
drive,
AX
ML
YAR,
HARE
Ly
optical 3-beam laser pickup WL VARHAL 2 RIFT
Objective
Lens
2-dimensional
parallel
drive
tik
$e
L
—
Yt
Laser
Type
GaAlAs
type
semiconductor
laser
RE
780nm
Wave Length 780nm
(257 4—Vvy b)
SIGNAL
FORMAT
BACAR
44.1kHz
Sampling
Frequency
44.1kHz
Brite
y
Re
1GEwy
bh
YULP/FeUARIL
Quantization
Bit
16-bit
linear/
channel
tieL—b
4.3218Mb/sec
Channel!
Bit
Rate
4,3218Mb/sec
RRA
EFM
Channel
Modulation
Code
EFM
L>-HEAX
CIRC
Error Correction CIRC
(A)
GENERAL
ER
100V
AC
50-60Hz
Power
Requirements
120/230V
AC,
50-60Hz
BRED
18W
is
(U.S.A./
Canada/
General
Export
WE
TH
442
x
153
x
344mm
(W
x
H
x
D)
Model) (Dy kX- ABD)
230V
AC,
50Hz
zs
16.5kg
(Europe/U.K. Model)
Power Consumption 18 watts tian
Dimensions (W x H x D)
442 x 153 x 344mm
(17-3/8" x 6” x 13-9/16" )
(incl. foot base) .
Weight (net) 16.5kg (36-6/16 Ibs)
Standard Accessories Wireless Remote Control Unit
RC-596 : VRDS- 25 (N)
RC-597 : VRDS- 25 (B)
Battery (SUM-3, “AA”, “R6” type)
xX 2, Lock Key X 1, Foot Base x 4,
AC Power Cord x 1
@improvements may result in specification or feature
changes without notice.
@I{VLAVETY RC-59E x 1
@ 8 Bik (#3, SUM-3)x2
@eox77L—- fbx)
@7yvbnx-Azx4
@ZRI-— x1
EIAJid ASAE PRL AIRE IC EO DEBIT kB HD
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| VRDS-25 |
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3 ADJUSTMENT AND CHECKS
aA the
1. Replacement of the pickup assembly
@ Before removing the pickup assembly be sure to solder
-bridge where indicated in the inset (Fig. 3-1) to prevent
the laser diode from being electrostatically damaged.
After replacing the pickup assembly, be sure to unsolder
the antistatic bridge. Or else the laser diode does not
function.
@Before servicing the pickup assembly be sure to prevent
electrostatic-inducer destruction by grounding not. only
test equipment in use but also yourself as shown in
Fig. 3-2. :
* Electrostatic charge drastically shortens the operating
life of the laser diode or possibly results in its
destruction.
@During the transportation, mounting and dismounting
of the assembly, support with your fingers at points
A and B as shown in Fig. 3-3. Be particularly careful
not to touch the actuator, photosensor and LD plate
and do not apply force to them.
@Don’t touch the plated portion of the flat cable end
directly with fingers.
@Use care not to break the flat cable.
@Soldering must be done quickly at less than 30W, 320°C.
@Don’t disassemble the pickup ass’y.
@Don’t apply shock to the pickup ass’y.
@Don’t place the assembly in a place subject to excessive
dust, heat or moisture.
Earth ring
(Lead wire)
Pick-up case
Chassis (GND)
Fig. 3-1 Fig. 3-2
2. Objective
@Laser beams are similar to infrared rays. Don’t look at
the beams directly and keep your eyes at least 30cm .
away from them.
@Don’t touch the objective with fingers.
@If objective becomes dirty, playback will deteriorate.
To clean the objective, moisten a good cleaning tissue,
such as made by KODAK, in isopropyl alcohol and wipe
the objective gently. Wipe off and excess fluid with a
dry cleaning tissue.
Earth
1.9747 ASSY ORR
@EY IT VTSASSY ERT ERS, V-V-VAA- FORE
PER IED HD, HP RBERS (Fig. 83-1) S4HTY) vy YLT
DOVEBELTC RSW, Ek, MONUZBSOMONIE
BIBT oy VPEALTCK FSW.
MADTY y VELREECAU-¥P-Y41A— FUBHEL ER
Ao
@Cry7F vTASSY EMORABA, NEB ECHR
P-REMS EH. AMAT - REAR, SBA
LT< HW, (Fig. 3-2)
kLV-F-PYAA— Fl. PSA DS & HMMS IEF
LED, EtlaBLETOCLAERLTC RSW.
ORDA. ROAL, HEMUOKI, Fig. 3-30AME BM
CRATC HSU, RIF 7FaL—J7-—, HRB, LDF
V— bbls, PRANK OHEMAKLY LEWEC KS
OIF yh -T WSO A -y FERS ITB Eee ¢
HEU
OIF Y AT H-TFWVIAGNRT OO CHIERE L CHEB LTS
TEAWS
@4HAFls30W, 320°CUA FEAL. FIER < MEL TK KS
Wo
@tY IT vy TF ASSYAAORES ESB ELBE HE
SW
@EVIT »yT ASSYIZHEE + GRIUMABRWOES ES
OTs -KIVRLORET SBM. Bil SOMA T
CHES US :
Resistor
1MQ~10MQ LD Plate
Photosensor
Fig. 3-3
2.x vy ZAlCDWT
OL —-F-HlLANMROBAMAHTCT. EOREOR, A
EV YRS 20cm LY LBEL TK KEW,
@VVACISFEMNEOE KC RSW
@VVAIBENA < EHREREADYEFLETOC. ROKGI
aR LT CRS.
VY RI Y-aVIR—-/S— (KODAKHBAY) KL Tyo
E-WVPVA—W (LP.A) RL CHR L. MAR OTK
FIBRE LOTR SWS

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3. Anti-shock bracket
To protect the laser pickup mechanism from shocks and
movement during transit, it is secured by a special anti
-shock bracket.
Releasing the anti-shock bracket
Before starting operation, be sure to release this bracket,
which is accessed from the bottom of the player. To do
this, place the player with its rear panel down on a firm,
smooth surface as shown in the diagram. Then insert the
lock key (metal plate) provided into the hole and turn
it to “FREE”.
Transporting the player
If the player is to be transported, the anti-shock bracket
should be fixed again. Before doing this, first open the
disc tray to make sure that a disc is not loaded. Then,
secure the anti-shock bracket by turning the screw to
“LOCK”.
| VRDS-25
3. ie Blo Ob T
AAMEBORDOD 5 Ky IT yo TEF SRO, RRC
UELTHV EF. PREMHES ESBS, USD TAR
LTC KS.
BRIE @ Lavi
ABOBREANABIX. MOKSCHMERELI, HBOS
BERLE LIAS, “FREE” HUN 380° HC HLES.
MATS ESI
Si CHE LTC RSW, BREAN, 71 AZ bUTE—
BAU CH 4 ATOMOM ECHO CE RHMRLER, BUT 4
AYbVASAOET. BREW. MMS LIT, NROS
AC “LOCK” HIN 30° HC BILEF.
CER
ieee LS TCT CHRELUBETEET. NEAN
2S £, GiREROMAICORMNY ET OCC. EAV
VOLTAGE CONVERSION
Be sure to remove the power cord from the AC outlet
before repositioning the voltage converter switch.
1. Locate the voltage selector on the rear panel.
2. Using a flat-bladed screwdriver, set to the appropriate
230 V or 120 V position according to your area.
120V 230V

| VRDS-25 |
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sdecttaicenatte ee tS
3-1 SERVO ADJUSTMENT t+ —-*ig%
SERVO PCB
v403
BOTTOM VIEW
Frequency Counter
PWR SERVO PCB
DC voitmeter
TOP VIEW
Fig. 3-5
3-1-1 Clock frequency adjustment 3-1-1 70 y TARA
1. Connect the frequency counter to P414. 1. ARRAY VY YE PA14ICEERET Z.
2. Adjust C416 so that the clock frequency is 16.9344 2. FE ILIKRE CO ARRAS 16.9344MHz + 50ppm ( 16.9336
MHz + 50ppm (16.9336MHz~16.9352MHz) at the stop MHz~16.9352MHz) it SKDI C416 SHES S.
mode.
3-1-2 Sled balance adjustment 3-1-2 Alby FNSYV RARE =
1. Adjust V403 for OV potential between TP1 (or P415) 1. TP1(#EKUMP4I5)O1BEY (SD) &E2BE LY CGND) HO
pin 1 (SD) and pin 2 (GND). BMED OV IESE V403 SHAT ZS,

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3-2 AUDIO ADJUSTMENT 4-747
Fig. 3-6
AUDIO PCB
| VRDS-25

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VRDS-25
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3-2-1 Distortion adjustment
1.
Connect
the
distortion
meter
to
the
LINE
OUT.
2.
Play
the
track
2
(1kHz,
0dB)
of
the
MCD-111.
3.
Set
$101
No.3
to
ON,
and
perform
coarse
adjustment
with
$103(Lch)/$203
(Reh),
then
fine
adjustment
with
V101(Leh)/V201(Rch)
so
that
the
distortion
becomes
minimum.
Specification : 0.004 % or less
(400Hz
HPF
+A
weight
+
20kHz
LPF)
3-2-2
Output
DC
offset
adjustment
1,
Connect
the
DC
voltmeter
to
the
LINE
OUT.
2.
Play
the
track
17
(1kHz,
—60dB)
of
the
MCD-111,
and
adjust
V102(Leh)/V202(Rch)
so
that
the
offset
voltage
becomes
within
0
+
10mV.
3-2-3 Output level check
1.
Connect
the
AC
voltmeter
to
the
LINE
OUT.
2.
Play
the
track
2
(1kHz,
0dB)
of
the
MCD-111,
and
check
the
output
level.
Specifications
;
2.2
0.5Vrms
(50kQ
load,
RCA)
2.2+0.5Vrms
(600
Q
load,
XLR)
3-2-4
Frequency
response
check
1.
Play
the
track
3—6
(20Hz~
20kHz,
0dB)
of
the
MCD-111,
and
check
that
output
level
are
within
the
specified
values
with
respect
to
the
1kHz
reference
level.
Specification
:
within
+
0.5dB
3-2-5 S/N check
roar .
Play
the
track
7
(non-signal)
of
the
MCD-111,
and
check
that
noise
level
are
within
the
specified
values
with
respect
to
the
1kHz
reference
level.
Specification
:
100dB
or
more
(A
weight)
3-2-6
Channel
separation
check
1.
Play
the
track
8
(L:
1kHz//R
:non-signal)
of
the
MCD-111,
and
check
the
leakage
from
Lch
to
Rch.
2.
In
the
same
way,
play
the
track
10
(R:
1kHz/L:
non
-signal)
of
the
MCD-111,
and
check
the
leakage
from
Rch
to
Lch.
Specification
:
100dB
or
more
(A
weight)
3-2-1 BRRE
roy
_ LINE OUTMHPEICBRH EET 5.
. MCD-111 © 2 #8 (1kHz, 0dB) + HUES 3.
3.
S101D3BeONKL,
BRORBLGSEKIIZS103
(Leh)
/$203
(Reh)
CH,
V101
(Loch)
/V201
(Reh)
CHK
HST So
FARE 0.004 MILE
(400Hz HPF +A weight + 20kHz LPF)
iw)
3-2-2 HHADCAIE vy bP
1. LINE OUT SHFIZ DC RY bX -—Y —- SRT So
2. MCD-1110 17#HB (1kHz, — 60dB) HAL. 7 ey bE
FEAO
+
10mV
IES
&
5V102
(Leh)
/
V202
(Reh)
eat
TSo
3-2-3 AUAWFry7
1. LINE OUTHFK ACH A-Y-EBMTS.
2. MCD-1110 2H (1kHz, 0dB) ZBL. WALA VERE
tTSo
FAH : 2.2+0.5Vrms (50 kQ Hie, RCA)
2.2+0.5Vrms (600 Q Bf, XLR)
3-2-4 ARRUSTEF zy 7
1.
MCD-11103~6
HHH
(20Hz~20kHz,
0dB)
&+BHEL.
AME
AV
(1kHz,
0dB)
ext
LAURAILH
SCE
SHRT
S0
fa:
£0.5dBLIN
3-2-5SINFxr v7
1. MCD-111 07 HE RES) EBELL J PAV AIRE
AVI LBUBA CHS OE EMERT So
$848:
100dBLLE(A
weight)
3-2-6 Fx VRIWENE-YavFzry7
1.
MCD-111
O8
HHA
(L:
1kHz/R
:
HES)
SBAELY
Rch~
DRNEEAT
So
2.
TAREIz
10
HB
(CR
:
1kHz/L
:
HES)
SBE
LY
Lech
Olin
EHR
Do
FAIS
-
100dBULE
(A.
weight)

4
4
|
|
}
{
| VRDS-25
PARTS LIST SECTION
NOTES
@PC boards shown are viewed from parts side.
@ Parts marked with * require longer delivery time.
@ The parts with no reference number or no parts number in the
exploded views are not supplied.
@<As regards the resistors and capacitors, refer to the circuit
diagrams contained in this manual.
@A\ Parts marked with this sign are safety critical components.
They must be replaced with identical components - refer to the
appropriate parts list and ensure exact replacement.
@ Parts of [ ] mark can be used only with the version designated.
(J]: JAPAN [US]:U.S.A. [C]:CANADA [GE]:GENERAL EXPORT
[E] EUROPE [UK]:U. K. .
VRDS-25 (N):Gold Version VRDS-25(B):Black Version
: ate
= RB
e7UY SSRRIBRHORENTWIET.
Oc HMORMISMAMNAFO DY KT.
BSDUOTCTH SKA. |
ODFRICRBOR BARU mBOR BRlSRRLEA.
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BIRR ZRLT< HESALY
OAMSRSSSRRCT.
SHAT SRRLUSS 4 Py TIEOM GE eEAL TK EAS
ems
[J]: JAPAN [US]:U. S.A. [C]:CANADA [GE]:GENERAL EXPORT
({E]:EUROPE [UK] :U. K.
VRDS~25(N):Gold Version VRDS-25(B):Black Version

_VRDS-25
4 EXPLODED VIEWS AND PARTS LIST
SBME N-YUA
EXPLODED VIEW-1