Sony DTC-670 User manual

SERVIGE
MANUAL AEPModel
Tape
Recordinghead
Recording
time
Tape
speed
Drum
rotation
Error
correction
Tape
Track
pitch
Sampling
frequency
Modulation
system
Transferrate
hlumber
ofchannel
SPECIRCATIONS
Digital
audiotape
Rotary
head
Standard:
120
minutes.
Long-play
mode:240minutes
(with
DT-120)
Standard:8.15mm/s,
Long
play
mode:
4.075mm/s
Standard:
2,000
rpm,
Long-playmode:
1,000rpm
Double
ReadSolomoncode
13.6
Fm
(20.apm)
48kHz,44.1
kHz,32kHz
8-10Modulation
2.46
MbiVsec.
2channels,
stereo
Model
NameUsinq
Similar
Mechanism DTC-57ES
Taoe
TransoortMechanism
Tvpe DATM-1OO
Wow
and
flutter
Input
Oulpul
-continued on ne)ct
page
-
DIGITAT
AUDI(I
TAPE
DECK
D/Aconversion
(Ouantization)
Standard:16-bitlinear
Long-playmode:12-bit
non-linear
Frequencyresponse Standard:
2-22,000
Hz(10.5
dB)
Long-playmode:
2-14,500
Hz
(r0.s
dB)
Signaltonoiseratio Standard:more
than90dB
Long-playmode:more
than90
dB
Dynamic
range Standard:
morethan
9O
dB
Long-playmode:morethan
90
dB
Total
harmonic
distortion Standard:less
than
0.005"Â
(1
kHz)
Long-playmode:lessthan
o.@%
(1
kHz)
Belowmeasurablelimit
(10.001%
w. PEAK)
Jacktype lmpedance Ratedinput level
LINEIN phono
iack 47kohms -4 dBs
DIGITAL
IN phono
jack 75
ohms 0.5
Vp-p,
20"/o
DIGTTAL
IN optical
iack
Jack
type lmpedance Rated
outpùl Load
impedance
LINEOUT phono
lack 470ohms -4 dBs Morethan
10
kohms
PHONES stereo
phone
jack 220
ohms 1.3
mW 32ohms
DIGITALOUT
(optical
jack):
wavelength660
nm
SONY

General
Powerrequiremenls
Power
consumPtion
Dimensions
Weight
Power
requirements
Dimensions
Weight
Remotecommander
(suPPlied)
Remotecontrol
system Infraredcontrol
2n -2æ VAC,
50/60
Hz
32W
Approx.430x125x350
mm
(wh/d)
(17x5x13'/rinches)
Approx.
7kg
(15
lb14oz)
3VDC,
withtwosizeAA (R6)
batteries
Approx.
63x19x175
mm(wlh/d)
(2tlrx3l.x7inches)
Approx-
130
g (aoz)incl.
baneries.
TABLEOF
CONTEÎÛTS
Section
1. GENERAL
Features
Location
and
FunctionofControls....
Gonnections.
2. DTSASSEilBL
3. ADJUSTilENTS............ ..........-...
1
$1. Elecûical
Adiustments ......'.......
1
4. DIAGRAIIS
Circuit
BoardsLocation ...........'
1
Block
Diagram
Waveforms
Semiconductor
Lead
LaYouts
Printed
Wring Boards
- MD/ Powersupply
/ Display
section
Schematic
Diagram
- MD/ Powersupply
/ Displaysection
Printed
WidngBoards
- Mainsection
SchematicDiagram
- Mainsection
lCBlockDiagrams.............
PinFunctions
5. EXPLODED
VIEWS
Tirls
Supplied accessories
Sonybatteries
SUM-3(NS)
(2)
Audioconnecting
cords
(2phono
ptugs
- 2 phono
plugs'
stereo
forline
inputsandoutputs)
(2)
Design
andspecifications
sublect
tochange
without
notice.
SAFETY-RELATED
COMPONENT
WARNINGII
COMPONENTS
IDENTIFIED
BY MARK Â OR DOTTED
LINE
WITH MARK Â OI.I
THE SCHEMATIC
OIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL
TO SAFEOPERATION.hEPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMEERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENIS PUBLISHED
BY SONY.
Front
PanelSection
.........
Chassis
Section.........
Mechanism
Sec{ion
1.................'.
Mechanism
Section
2...................
Mecianism
Sec{ion
3...................
Mechanism
Section
4...................
6. ELECTRICAL
PARTS
LIST
+1.
4-2.
4-3.
4-4.
4-5.
4-6.
4-7.
+8.
4-9.
+10.
$1.
5-2.
5-3.
54.
5-5.
$6.
5-7.
PBECAUTIONSFOR
INSPECTIONS
ANDREPAIR
WITHFOWEB
OFF
Before
beginning
rapair
work
after
turning
OFFthemainsrvitch,
besure
tofirstremove
CN932
(EH8P)
ofthepower
board.
When
assombling
theequipment,
be
sure
to plug thisconnector
lest.
This
isbscauso,
"r"n *riththemain
srritch
turned
OFF,
electric
charges
stillremain
inthesmoothing
capacitor
in
th€powsr
board.Tharefore,
ifanother
flexible
board
isinserted
or removed,
aterminal
ofthepower
supply
may
shortanadiacent
terminal
whiledestroying
thedevice'
19
rt

Thiesoction is orcracted
from
instruction manual. lEcTloN
I
GENERAL
Serial
copy management
system
Thisunit
utilizes
theserialcopy
managementsystem
that
permits
digital{o-digital
recordinglorone
generation.
You
canrecordCDsound
orother
digital
formatsthrough
a digital-to-digital
connection.
(See
page
36.)
Threesamplingfrequencies
Recording/playback
canbedone
with
threesampling
frequencies
(48
kHz,44.1kHz and
32k{z),
48kHz:
For
analoganddigital
input
signalsina
standardmode.
44.1kHz:
For
compact
disc
andpre-recorded
DAT
tape.
32k{z: For
analog
input
signals
ina long-play mode.
Long play mode
Thisunitcanoperate
inalong-playmode.Analog
input
signalscanberecorded orplayback
loruptofour
conseculive
hourswhenthe
DT-120DAT
cassette
tape
is
used.
The
sampling
frequencywill
be
32kHz
in
the
longplay mode.
Visiblecassette
loading
You
canview
the
tapeoperation
lhrough
the
lidofthe
cassettecompartment.Due
toa revolutionary
new
transportmechanism,
cassetteloadingtime
hasbeen
significantly
reduced.
Excellentsoundquality
. 1-blt Ây'Dconverler
For
the
Ay'Dconvertersectionwhichconverts
analog
inputsignalstodigital
signals,
the
unitemploys
a 1-
bitA/Dconverlerwhich theoretically
generates
no
zero-crossdistortion
foraclear,elegant sound
quality.
. Pulse D/Aconverter
Superior
playback
performance
isachieved
with
a 1-
bitD/Aconverter.
Richvarietyol subcodeinformation
This
unitcanrecord subcode
informationsuchasStart
lDs,
program
numbers,Skip
lDs,
andabsolute
time
data,enabling
you
toquickly
locale
tunesanddisplay
theplayback time
inthe
same
manneras
when
playing
compact
discs.
Postedlt recordlng
of sub codes
You
canrecord orrewrite
the
following
subcodesalter
theaudiosignalrecording
hasbeencompleted.
StartlD:
Signifiesthebeginning
ofa selection.
Programnumber:
Givesa numbertothe
selection.
Skip
lD:
Signifiesthebeginning
ofa portion
tobe
skipped.
EndlD:Signifies
theendposition ofrecording/
playback.
Sincesubcodes
are
written
onthetapeseparately
from
audio
signals,
theaudiosignals
arenot
attected.
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sEcTloN
2
DISASSEMBLY
Remove
thefotlowingdevicesshown by0, etc.lnthe
orderofthe numberc.
ICASEI
Unscrew
thefour caseattachment
screwsand
remove
thecase,
ICASSETTEWNDOWI
lO Press
the OPEN/CLOSEswitchto effectLOADING
OUT
STATE
(ifpowerisnotsupplied)
rotatethe
pulley
in
theleft
side
of
theMechanism Deck
countercloch,vise.)
G) Removethe cassetteby lifting thewindow up.
MECHANISMSECTION
HOLDER
@ Joint
g agrl -4'
lD stepscrer,"
(8mm)
O Mechanism -à
section
O steo
sr"r," (ê )
-w'ft:
(O pttwx g'ro
ç--\
@ steps"rer,"
I stepscrewrua| 6
b
?
N-s.\
-7-
O Hob"r (windowl

CASSETTECOMPARTMENT
MOTOR(M9O1I,
PULLEY.
GEAR
(CAM}AND SLIDER
@ sz.e*g
(O stepsct"""
(D G""t
(caml
(@Nyton
washer 6T
-M# e stider
(cam)
@ st"pscr"*
DRUM
O Removethedrum lead
wireson rearsideofthe
drum from the connector.
|o Nylonwasher
O Driving
belt
-8-

sEcTtoN
3
ADJUSTMENTS
Nqtes UUhen Maklng Adjustments
l. Adjusunents should beperformed in the order listed-
2. Use the following testtapes:
TY-71
II (8-909-81
2-00).....................................
Lævel
TY
-7
252
(E-909-822-00)
... Tracking
TY-7551 (8-909-81400) .............Funcrions
TY-308 (E-892-35E-00)
......................................
Blank
Usethe following torque meten
TW-7131
(E-909-708-71) ............FwD
3. Swirches
andcontrolsshould
besetasfollows unlessotherwise
specified.
5. Cleaning
of theRevolving Drum
(1) Foldachamois
(2-034-697-00)
or aknir clothinto4 or more
files,
slightlyimpregnate
it wirhacleaning
liquid (9-919-573-
00),andsoftly touch thedrum with it andmanually roratethe
drum slowly counærclockwise by 2 to 3 turns for cleaning.
(2) At thatdme, becarefrrl not to movethechamoisvertically ro
the
headtip.
Otherwise,
theheadtipmayprobably
bedamaged.
6. Becarefulnot tomoveRV I andRV2 onrhe
RFAMP boardin the
mechanism
assembly.
7. To adjustthe tapepath andguides,remove the holder
as
shown
inthediagram
andusetheDATholderjig
A). Thiswill makeit easier
to performadjusrments.
. Firstturning
the
pulley
counterclockwise
toput itin
out stâtuswill. make removal and reattachment
of
holder
assemblyeasier.
. To performadjustmenE, turn the pulley clockwiseto put
in loading in status, load the cassette
tape and set the
switchto the ON position.
TIMERswitch
REC
MODEswitch
IMUT switch
REC
LEVELconnol
PHONES
LEVEL conrol
OFF
LONG
COAXIAL
Min.
Min.
4. Creating anend sensorcassene
(l) Press
ûretapeslider lock andmove the slider in thedirection
indicated by the arrow.
Slider lock
(2) Opcn the lid andcut the tape.
Turnthe
hubs
untilthetapeiscompleælyinsidethecassette
(bothTandSsides).
The
ed sensorcassetteforend
sensoradjusrnentisnow
ready
for use.
IN3lrvitch
8. Testmode
Thetesmode iseffecædby shoningTP CXTESTMAIN,
SERVO
andXTESTDISP)onthemain
boardandthecontrot
switch
boardandGND.
(l) Testmode
(main.
sewo)
Tum OFF thepowerswitch,connecrXTEST MAIN and
XTEST
SERVOonthemainboard
toGNDand
perfonn
the
following
adjusunents.
. Tape
path
ftneadjustment
. DPGadjussnent
. ATFpilot(GCA)
checking
. Endsensorchecking
. F'WDrorquechecking
. FWD
backænsion
checking
andadjusrment
(2) Test
mode
(display)
Youcan
checkthefollowingFL displaytubeand ttre
panel
switch
bytuming
OFFthe
power
switch,
disconnecting
CN932
onthe
power
board,removingfleûble board CN752
onthe
controlswitch boand,
connecting
XTEST DISP to GND,
connccting
CN932againandthenturningON thepower
switch.
Step screw
---(P
Hubhole
(3)
-10-

DRUM
DRIVE
BOARD,DRIVINGCHASSIS
O Removetheconnectoron thedrum
drive
board'
lg Drurn
drive
board
CAPSTAN
MOTOR(M902)
O e2.6"8
e Precision
screwM1.7x4
I\\q
O Dri.ringchassis
O capet"n
motor
(M902)
F
J
-9- $'