Dual 1256 1257 turntable
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Extracted text from dual 1256 1257 turntable (Ocr-read)
Page 1
Ausgabe September 1979
Service Manual 1256 ' 1257
Technical Data
Current type AC 50 or 60 Hz convertible by changing the drive capstan and the motor.
Line voltage l15 and 230 V changeable or 12 V~
Please also note the voltage details of the type plate on the underside of the turntable,
Drive Dual 16 pole synchronous motor via flat belt to flywheel rotor
Power consumption Maximum 8 watt
Platter Aluminium platter 270 mm d), 0.9 kg
Platter speeds 33 1/3 and 45 rpm, automatic tonearm setdown coupled to speed selector
Pitch control Adjustment at 33 1/3 rpm Approximately 1 semi-tone l6 %) at both platter speeds
Wow and flutter
(according to DIN 45 500) Rumble signalrto~noise-ratio >68 dB
Tonearm Torsionrresistant aluminium tubular tonearm in four point gimbal suspension.
Tonaarm bearing traction Vertical < 0.08 mN (0.008 gl
(in relation to stylus tipl Horizontal <0.16 mN (0.016 g)
Tracking force 0 7 30 mN (O . 3 gl continuously variable, reliable as from 5 mN (0.5 gl tracking force
Pick-up head With 1/2 inch screw~in mounting may be provided with special
accessory number 261 865, available in HiFi shops.
Weight 1256 approximately 5.0 kg 1257 approximately 5.2 kg
Page 2
Contents
Page
Technicai data
Pickrup Wiring diagram
Motor and drive
Platter
Stroboscope
Pitch controi
Fitting 1/2 inch pickrup
Antiskating device
Cueing device
Tonearm
Starting
Manual start
Mutlng swnch
Stopping
Record drop
Sh ut-oif median is rn
Adjustment points;
oooooo\l\l\lwummammmmmhnbebwwwwwM-a
Fiat belt
Changing the motor puiiev
Tonearr'n and tonearm bearing
Adiustment of tonearm bearing
Removal of tonearm complete vvlth tonearm bearing i256
Removal of tonearrn or spring housing 1256
Removal of tonearrn complete with tonearrn bearing i257
Exchanging the tonearm or spring housing i257
shutoff and change cycle
Speed changeover
Changing the cueing device plate
Tonearn'l set-down point
8 Switch-off position
8 Reiease rocker
9 Tonearrn vertical lift
9
9
Tonearm does not set down or lowers onto record too
Rated speed reaches limit of adjustment
9 - 12 Replacement parts with exploded view
i3 Lubricating instructions
Fig, 1 Pickup Connection Diagramm
Kontaktplme
Contact plate
Plaque de contacts
a) With cynch jack
rechter Kanai Kurzschlieflev Cynchsteckar
right channel Muting switch phnno plug
Canal droit Court-clrcuiteur fiche evnch
/ \ r ------- -l
rot / led / rouge , \ _
i \
i i / I
i
griin / green / vert i 1
\ /
\ 1
schwarz / black / negro
hlau I blue / bleu / \
weilS / white lbianc \
\ /
\_/ L _______ J
linker Kanal
leh channel
Canal gauche
Masse draht
Mass lead
Mass cable @
L»;
i--_?
r:
C
l ;
bi With DiN lac<
DINVStecker 5-polig
DIN»ptug 5 pin
liche DIN 5 poles