Dual C919 Handleiding
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Dual
Edition
March
1977
09191
Service
-Manual
Dual
Gebrüder
Steidinger
•
7742
St.
GeorgenISchwarzwald
Download from www.dual.de
Not for commercial use
Contents
Page
Technical
Data
2
Mechanical
Parts
1.
Removal
of
cover
plate
2.
Dismounting
and
mounting
3.
Motor
4.
Adaption
for
line
frequency
5.
Drive
Belts
6.
Wow
7.
Pressure
Roller
Lever
8.
Brake
Plate
9.
Coupling
Assembly
10.
Muting
Switch
11.
Power
Switch
12.
Memory
Switch
13.
Bowden
Cable
14.
Record/Playback
Head/Erase
Head
15.
Cleaning
16.
Lubrication
Electrical
Parts
Functions
Test
and
Adjustment
Data
Adapting
the
unit
for
a
different
line
voltage
and
motor
connection
shematic
Alignment
and
Module
Positions
Circuit
Diagrams.
Printed
Circuit
Boards
Connector
positions
Spare
Parts
with
Exploded
Views
Technical
Data
The
Dual
C
919
meets
or
surpasses
the
requirements
of
DIN
(German
Industry
Standard)
45
500
for
HiFi
home
studio
equip-
ment.
The
values
stated
below
are
based
on
the
latest
DIN
re-
ference
tapes.
Tapes
Speed
4.75
cm/s
Deviation
from
correct
speed
<
1
%
Wow
W.
R.M.S.
<±
0.07
%
According
to
DIN
only
playback
<±
0.10%
According
to
DIN
record/
playback
<±
0.14%
Frequency
response
las
referred
to
DIN
tolerances)
Fe
tape
20
—
15.000
Hz
Cr02
tape
20
—
16.000
Hz
FeCr
tape
20
—
17.000
Hz
Harmonic
distortion
K3
at
333
Hz
(related
to
0
dB
VU)
Fe
tape
<
1.7
%
Cr02
tape
<
2.8
%
FeCr
tape
<
1.2
%
Rumble
weighted
signal-to-noise
rate
with
Dolby
without
Dolby
Fe
>
60
dB
>
53
dB
Cr02
>
61
dB
>
56
dB
FeCr
>
63
dB
>
58
dB
Channel
separation
at
1.000
Hz
between
stereo
channels
in
opposite
direction
36
dB
>
70
dB
Erasure
at
1.000
Hz
Fe
Cr02
Oscillator
frequency
(push
-pull
osicillator)
Inputs
Microphone
(1/4
inch
coax.
jack)
Receiver/Amplifier
(DIN
jack)
Receiver/Amplifier
(RCA
jack)
Outputs
Receiver/Amplifier
(DIN
jack)
Receiver/Amplifier
(RCA
jack)
control
I
a
ble
Headphones
(1/4
in:
coax.
jack)
volume
controlled
Fast
-wind
time
for
C
60
cassette
Complement
2
ICs
33
transistors
19
diodes
Line
voltages
Line
frequency
Power
consumption
3
3
3
4
4
5
5
6
6
6
6
6
6
7
7
7,8
9,
10
11,
12
12
13,
14
15
-
19
20
-
24
25
26
-
38
>
70
dB
>
65
dB
100
kHz
(sensitivity
for
0
dB
VU)
0.22
mV/3,3
kOhm
1.4
mV/20
kOhm
45
mV/680
kOhm
750
mV/3.3
kOhm
0
—
750
mV/4.7
kOhm
4—
2000
Ohm
<60
sec.
110
—
125
V/220
—
240
V
adaptable
to
50
or
60
Hz
approx
35
W
2
Mechanical
Part
General
When
repairing
mechanical
parts
of
the
Dual
C
919
HiFi
cassette
deck
it
is
recommended
to
unhinge
the
basic
printed
circuit
board
(330)
and
to
turn
it
to
the
electronic
sec—
tion.
This
operation
is
not
mentioned
in
the
subsequent
chapters
of
the
service
in—
structions
since
it
is
required
for
any
ma—
nipulation
inside
the
unit.
This
also
app—
lies
to
the
removal
or
mounting
the
screen—
ing
plates.
When
completing
or
swivelling
the
basic
printed
circuit
board
make
sure
that
the
fork
(211)
is
located
in
the
center
of
the
recesses
for
the
key
plungers
(keys
in
neutral
position).
The
number
mentioned
in
the
subsequent
chapters
are
indentical
with
the
position
numbers
in
the
spare
parts
list
and
the
exploded
views.
1.
Removal
of
cover
plate
First
remove
the
following
parts
1.1
Four
slide
knobs
(21)
1.2
Two
pins
(18)
1.3
Cassette
window
(17)
—
First
open
casset—
te
compartment.
Then
remove
window
(17)
by
lifting
it
to
the
rear
and
pushing
it
forward.
1.4
Two
hexagon
self—tapping
screws
(10).
Flip
up
VU
meter
(300).
Push
cover
(11)
backwards,
lift
it
and
remove
it
(Fig.
1).
Reessemble
in
reverse
order
and
mount
pins
(16)
finally.
ma
k
2.
Dismounting
and
mounting
Pull
out
power
plug.
Remove
mounting
plate
(13)
from
the
bottom
of
the
cabinet.
Relea—
se
strainrelief
of
power
cable
by
removing
the
securing
wedge
(Fig.
2).
After
detaching
the
cover
(11)
undo
the
four
machine
screws
(12).
Remove
unit
from
the
cabinet.
When
mounting
proceed
in
reverse
order.
3.
Motor
When
the
motor
(252)
is
changed
first
of
all
disconnect
the
stranded
connecting
wires
from
the
connection
plate
(214).
As
an
aid
screw
a
M
3—screw
(S)
—
e.g.
M
3
x
15
—
into
the
hole
provided
in
the
plate.
Using
tweezers
and
a
small
wire
hook
care—
fully
detach
the
two
belts
from
the
drive
pulley
(240):
a)
Place
round
belt
(262)
on
the
bearing
bolt
Fig.
3)
b)
Place
flat
belt
(232)
on
the
screw
(S)
Undo
hex
nuts
(241)
and
remove
motor
(252).
Do
not
lose
the
two
washers
(242).
Fig.
2
Fig.
3
3
Product specificaties
| Merk: | Dual |
| Categorie: | Niet gecategoriseerd |
| Model: | C919 |
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