Teac VRDS-7 User manual

TEAC,
Gio
oc Jo,
SERVICE MANUAL
VRDS-7
Compact Disc Player
COMPACT
aise
DIGITAL AUDIO
Effective : June, 1993 5704065200

VRDS-7 |
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
laser
product.
There
is
not
hazardous
invisible
laser
radiation
during
operation
because
invisible
!aser
radiation
emitted
inside
of
this
product
is
completely
confined
in
the
protective
housings.
The label required in this regulation is Shown (1)
CAUTION
@ If you remove the above-mentioned housings under the operating state of the product, there is a possibility of human access to the invisible
laser radiation emitted from the optical pickup.
Pay careful attention, not to jet the invisible laser beam enter into your eyes.
@ If you find a troubled state of the laser diode, change to the specified new optical pickup.
e If you find a troubled state of safety interlock parts, change to the same type parts described in parts list.
CERTIFICATION
THIS PRODUCT COMPLIES WITH OHHS
RULES 21 CFA SUBCHAPTER J APPLI-
CABLE AT DATE OF MANUFACTURE
TEAC, CORPORATION
2) 3NAKA-CHO WUSASHOND SH TORO JAPAN
MANUFACTURED 1
e CAUTION
¢ ACHTUNG
Optical pickup: Type : KSS-240A
Manufacturer : SONY Corporation
Laser output : Less than 0.2 mW on the objective lens
Wavelength :760 — 800 nm
eOBSERVERA ¢ ADVARSEL
WAASOLE LASER RADIATION WHEN OPEN AND
INTERLOCAS DEFEATED MOK EXPOSUME TO BEAM
iM STRAM, AUSSETZEN”
QING LASERSTEAL WG WAR DENA OE
STMUEN AR TAG
+ USYNLIG LASERSTRALING VEO ABMING WW
‘SMKERHEDSAFBRYDERE EA LOE AF Fotos
UNOGA LOSATTELSE FOR STRALING
WAROMTLA! SUDMAGTELOA Mt SAA ASD. LATE SBNCIAA
HE LTAA MAK YMATONT
Saale VAAANLUCSIa CASERSATER
ADVARSEL - USYNLIG LASERBESTRAL FA OENNE DELEN ER
APE OG SRKE RPE TSSPERREN ER UTKOBLET
UNNGA UTSETTELSE FOR STAALING
CLASS 1 LASER PRODUCT
LUOKAN 1 LASERLAITE
KLASS 1 LASERAPPARAT
@ THIS LABEL IS ATTACHED TO THE PLACE AS ILLUSTRATED TO INFORM
THAT THE APPARATUS CONTAINS A LASER COMPONENT.
(@ DIESE AUFKLEBEMARKE IST AN DEM IN DER ABBILDUNG GEZEIGTEN ORT
ANGEBRACHT UM DARAUF HINZUWEISEN, DASS IM INNERN DES GERATS
EINE LASER-KOMPONENTE BEFINDET.
@ PASKRIFTEN SITTER PA APPARATEN SOM VISAS SOM UPPMANING OM ATT
APPARATEN OMFATTAR EN INBYGGD LASERKOMPONENT.
(D DETTE MERKAT ER ANBRAGT SOM VIST | ILLUSTRATIONEN FOR AT ADVARE
BRUGEREN OM AT APPARATET INDEHOLDER EN LASERKOMPONENT.
@ DETTE MARKAT ER SOM VIST PA ILLUSTRATIONEN ANBRAGT PA
INDERSIDEN AF TOPDAKSLET FOR AT ADVARE BRUGEREN OM AT
YDERLIGERE FREMTRANGEN VIL VERE 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 USD/ETTELSE 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! SUQJAKOTELOA 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.

| VRDS-7
2 SPECIFICATIONS
tt tk
AUDIO
Number of Channels 2
Frequency Response 1 — 20,000Hz + 0.3dB
Signal to Noise Ratio Better than 110dB (1kHz)
Dynamic Range Better than 99dB (1kHz)
Harmonic Distortion 0.0015% (1kHz)
Wow and Flutter Unmeasurable (Quartz accuracy)
Channel Separation Better than 110dB (1kHz)
Output Analog 2.2Vrms
Digital 0.5Vp-p/75Q (Coaxial)
- 15dBm --21dBm (Optical)
D/A Converter Bitstream Conversion
Digital Filter 8-times oversampling 20-bit digital
filter
Analog Filter 3rd order Butterworth filter
PICK UP
Type Optical 3-Beam laser pickup
2-dimensional parallel drive
GaAlAs type semiconductor laser
780nm
Objective Lens
Laser Type
Wave Length
SIGNAL FORMAT
Sampling Frequency 44.1kHz
Quantization Bit 16-bit linear/ channel
Channel Bit Rate 4.3218Mb/sec
Channel Modulation Code
EFM (Eight to Fourteen Modulation)
CIRC (Cross Interleave Reed
Solomon Code)
Error Correction
GENERAL
Power Requirements 120/230V AC, 50-60Hz (U.S.A./
Canada/General Export Model)
230V AC, 50Hz (Europe Model)
240V AC, 50Hz (U.K. Model)
PowerConsumption 22 watts
Dimensions (W x H x D)
442 x 149 x 331mm
(17-3/8" x 5-7/8" x 13-1/16" )
Weight (net) Qkg (19-13/16 Ibs)
Standard Accessories Wireless Remote Control Unit
RC- 481 (VRDS- 7N)
RC- 495 (VRDS- 7B)
Pin Plug Cord
Battery (SUM-3, “AA”, “R6” type)
x2
@ Improvements may result in specification or feature
changes without notice.
(A-—F 47)
A-—FatFveVURANBR 2FeURID
BRR 1~20,000Hz + 0.3dB
SN EE 110dBuLA bt (EIAJ)
FAS 9IVYY 99dB AF (EIAJ)
mARER 0.0015%LIF CEIAJ)
DIDI ATE PR ABLE OK gest ieth )
FervRILENLY-Ysy 110dBLIE (EIAJ)
FFOTRA 2.2Vrms
FIUINEA 0.5Vp-p/75 Q (COAXIAL)
— 15~-21dBm (OPTICAL)
D/JATYIN-¥~ Ey hARU-L
FIUINDIANI— BEA -N-PUFUYT
20Eyv hk FUND 4a
FHFOFI4NI— BRNI-D-RAID4WI-
(Evy IP ut)
Ax WHOL YA, HERBE-L
ML YARHAX 2 RET RH
bier aL — Hf
RE 780nm
(25 74—Vy bh)
BALA 44.1kHz
BHiteEy b& BE h UT P/F eR
tiEL—Fb 4.321 8Mb/sec
BRAK EFM
LO-MEAX CIRC
(—A)
ER 100V AC 50-60Hz
AREA 18W
ET HK 442 x 149 x 331mm(W XH xD)
=e Okg
Aaa
@7D4VLAVEIY RC-481 (VRDS-7N)
RC- 495 (VRDS- 7B)
@ Fe Bik (B3, SUM-3) x 2
@ RRA
* {LER LOM. BOLD ES, RESTS CEMBVESF,

VRDS-7
3
CASE
AND
FRONT
PANEL
REMOVAL
Sse
RB
te
OF
LG
:
mobl number-o
BSMBCAL TC EAM
Disassemble in

| VRDS-7
4 ADJUSTMENT AND CHECKS
aa & HEE
1. Handling the pickup assembly
@ 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. 4-1.
* 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. 4-2. Be particularly careful
not to touch the actuator, photosensor and LD plate
and do not apply force to them.
@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)
Resistor
IMQ~10MQ
Earth
Fig. 4-1
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.
@lIf 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.
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.
1.b 97 17 ASSY ORR
@LvITyYTASSY EMRYRIWBS I, MAB CIHR
F-AEMA LH MAT -AETICU, BEDE TOIE
LTC HRW, (Fig. 4-1)
KLD-¥-PAA— KA, BBA dS LAPS CRF
LEY, EKMGBLETOCLERL TCR SU)
@MOHIT, MOAL, HbEBUORIA, Fig. 4-2OABE BM
CHATCHASU, BK77Fazt—9—,. HRB, LDF
VD— haps, FANE YO ASMA LEWEC KS,
OV IT yTASSY KKAKORBE LUA ELIE CR
AW
@EY IT YT ASSY IR ¢ HBIUMABDOS RAV
@tl - hIVKEORET ABM, Bh SHROBMLRUT
C TERU,
2. xD YAILIWT
OL —¥—-HSEFAROABRMIAHTT. BHOREDA, FB
RLY ADS 30cm LEBEL TC HSU
@V YALE EARNEST CRS
@VVArBNA <. EREREAAMERFLETOC, ROK
fate OTC KAU
VY RAY Hav IR—7S— (KODAK HBS HY) I. PFO
E—WFVaA—W (LP.A) SRL THRE LA ROR OL
SICMTRSE DTN SY
VOLTAGE
SELECTOR
120V
230V
oJ

VRDS-7
4-1 SERVO ADJUSTMENT
TEST DISC: YEDS-18
4-1-1 Checking the pickup actuator operation
Before loading the disc, turn the power ON and check
that the pickup actuator moves up and down six times.
(If the pickup is not at inside on the disc, perform the
above operation after moving the pickup to the inside.)
4-1-2 Focus gain adjustment
1. Apply 1.16kHz/3.5Vp-p to TP1 pin 1(FE2) from
an external OSC via 100k Q resistor.
2. Adjust V402(F.GAIN) so that phase at TP1 pin 2
(FE1) is 90° with respect to that of the external OSC
during playback.
Oscillator
Oscilloscope
1.16kH2/3.5Vp-p
4-1 +—KIgE
FAkF+AZ: YEDS-18
tT Ey IF VAST IVF aL—H—HEF CD
BRON Cy 77ST I FaL—¥—-MOEF 1 ATKLA
BAPARSId 315) LPT SCE. (Ey 7 Py TRRAM ICE
Bld, RAAB Lac ET So bo) 74 AT WRAL,
4-1-2 74 —-HAAZTA VBS
1. ABBOSC & O 100k Q OFHLEH LT 1.16kHz/3.5Vp-po
S52 TPIOVBEY (FEZ) IAT S,
2SUTIRREC TPL O 2H Y (FEL) E28 OSC & OTA
90° izH# Ak Iz V402 (F.GAIN) HHT SZ.
SERVO PCB
Fig. 4-3
4-1-3 Tracking gain adjustment
1. Apply 1.7kHz/4Vp-p to TP1 pin 3(TE2) from an
external OSC via 100k 2 resistor.
2. Adjust V401(T.GAIN) so that phase at TP1 pin 4
(TE1) is 90° with respect to that of the external OSC
during playback.
Oscillator Oscilloscope
1,70kH2/4Vp-p
Fig. 4-4
ANS bh Sy FITS VRB
1, ABBROSC.4 9 100k Q OUP EH LT 1.70kHz/ 4Vp-p 018
SX TPIOSBEY(TEZ) ANTS.
2PUTIRHEC TIO 4 E Y(TE1) CX8B OSC EL OHA
90° izt# B&F V401 (T.GAIN) HST 4,
SERVO PCB

4-2 AUDIO ADJUSTMENT 4-747
DISC: YEDS-18 (MCD-111)
TRACK No. 547 | FREQUENCY Bikek
—_
. Output level
HALAL
. Channel level
difference
F 9 VRIVLNIVE
VRDS-7 _
aa
REMARKS
ia =
load impedance :
BIT VYE-SVYA:
50k Q
SPECIFICATIONS
m
2.1 + 0.3Vrms
1.0dB or less
. DC offset
adjustment
DCAD» bP
Adjust V151(Lch),
V251 (Reh) on AUDIO
PCB so that the offset
voltage becomes OmV.
Tsk
ec
FTE
y
RMEDNOMV
Ic
%SBKSB AUDIO PCBO
V151(Leh), V251 (Reh)
eT 3.
. Harmonic
distortion
BARES
. Frequency
response
FRSA E
0.004% or less a es Hh
20Hz~20kHz Within + 1.0dB reference level: 1kHz
. S/N ratio
S/NEE
. Channel
separation
Fe VAIL
BNL-—Yay
DIN AUDIO
(Use SHIBASOKU 725
or equivalent)
100dB or better
95dB or better DIN AUDIO
. Emphasis effect
LVI r YADR
AUDIO PCB
Fig. 4-5 Adjustment locations
-— 9.0 + 1.0dB (YEDS-18)
—~
20
+
1.0dB
(MCD-111)
reference
level:
1kHz
(3) DC voltmeter
(1,2,5,6,7,8) AC voltmeter
(4)
Distorion Analyzer
Fig. 4-6 Test setup
i
|
3
3
}
E
E

VRDS-7 |
5 IC BLOCK DIAGRAMS
ICFOyISA PIS L
U121 SM5840AP U151, 251 SAA7350AGP
VDDATR
& 8
> >
C=)
SWITCHED
CAPACITOR
NETWORK FBR-
FILTER CALCULATION & ATTENUATION CALCULATING
E @3) INTR-
3 (8) VSSAT
5
(30)
IRR
5) : FBL+
G S
E INTL+
= 2
g # G5) FBL-
~ INTL-
U403 CXD2500AQ
MUTE
PSSL
MNTO
MNT1
DIGITAL PLL
EFM ADDRESS PRIORITY
bisa AREER MNT2
MNT3
RAOF
C2PO0
RFCK
GFS
SYNC
SERIAL/ PARALLEL
PROTECTOR PROCESSOR PLCK
UGFS
TIMING GToP
4 GENERATOR 1 | LRCK
ur -
a
eck
——i——— mar
@)
@
DATA
PROCESSOR
SUBCODE
PROCESSOR ERROR
CORRECTOR BOUT
16-TIMES
OVERSAMPLING
FILTER

VRDS-7
U402 CXA1372S
INPUT SHIFT REGISTER
ADDRESS DECODER
2L DATA REGISTER
4 w Qa ro) o
w
a
E
TRACKING
PHASE
COMPENSATION
WINDOW
COMPARATOR
COMPENSATION
U410 LB1649
|| uaaria Bud |-—J
INPUT LOGIC
HE
9 (o) fo)
a
FE
2 a é
OUT3
n Zz
Vee

VRDS-7
U491 uPD75212ACW
BASIC
INTERVAL
TIMER
TIMER /EVENT
COUNTER
TIMER/PULSE
GENERATOR
SERIAL
INTERFASE
INTERRUPT
CONTROL
10
GENERAL
REGISTER
ROM
PROGRAM MEMORY
12160 x8 BITS
DATA MEMORY
512 x4 BITS
SYSTEM CLOCK
WATCH
|
CLOCK
GENERATOR
STAND
BY
GRUICLOCK
ct [Bie (Pm OC” Mn
U501 uPD7566CS
P10/Cino
P1t/Cint
Ca] PORTO
BUFFER
TIMER/
Test
“}
POWVREF
ie CONTROL <0
P12/Cin2
Pt3/CIN3
7
P80
PROGRAM
COUNTER
PORT
8
LATCH
BUFFER
GENERAL REGISTER
PROGRAM
INSTRUCTION
DECODER
DATA MEMORY
Clock STANDBY. 64x 4 BITS
GENERATOR | CONTROL PORT 11 fg P11
2
BUFFER -—] —
FIP
CONTROLLER
DRIVER