Dual C839RC - Maintenance and Troubleshooting; Maintenance and Service Procedures; Fault Detection and Solutions

Maintenance and service
From time to time it is desirable to clean the heads, capstan,
pressure rollers and tape guides. For this purpose, the cover
(4) can be unscrewed.
The azimuth alignment can also easily be made by turning the
screw (Fig. 3). This should be left to the trained repairman
however.
For more extensive maintenance work in the area of the heads
and drive mechanism the dust cover (7) must be removed. For
this, turn off the POWER-switch (1) and remove the cover (4).
With the dust cover turned up first swing it out from the left
side.
For cleaning use a linen cloth or cotton swab (e.g. O-tips)
moistened with alcohol. Never use metal instruments or touch
the head surface with your fingers.
Since all the points that require lubrication have been generously
supplied with oil, your recorder will work for many years un-
der normal conditions with no trouble. Please do not try to
lubricate the recorder yourself. Special lubricants are needed
and lubrication and other kinds of service should only be
provided by a qualified technician or an authorized factory
service agency.
Detection of faults
Should your cassette deck give any trouble please check whether
the
cause
may
perhaps
lie
in
incorrect
operation.
The
following
table may be of help. In the case of any faults which appear
inexplicable,
your
HiFi
dealer
or
nearest
Dual
service
should
be
consulted (*possible cause or correction of default).
The unit cannot be switched on.
Power supply is interrupted, the plug is not properly
pushed home.
The equipment turns off 1 or 2 seconds after switching on.
*
The
cassette
is
producing
too
much
friction,
turn
by
hand
a little
farther
or rewind
( 44
(12),
»»
(15)).
If this
does
not
help,
try
tapping
the
cassette
on the
tabletop.
* In inserting the cassette, the tape has got behind the capstan.
Tape
does
not
start
even
though
the
take-up
indicator
(6)
and
light next to the start key is on.
* The PAUSE key (16) is pressed.
Playback varies in pitch.
*
Cassette
is
sticking
or
over
filled.
Rewind
cassette.
* The cap and pressure rollers are dirty. Clean them as
described in the section “cleaning, maintenance”.
No reproduction through the amplifier although the headphones
work properly.
* Adapter connection to the amplifier is broken or incor-
rectly connected.
* Output level control istumed down.
After inserting the cassette the tape starts to play immediately.
+ TIMER switch (25) is set to "PLAY".
After pressing the start key » (14) or « (11) the device turns off
immediately.
* The tape has finished and MODE-switch (2) is selected.
After pressing the start key » (14) the device starts playing to-
ward the 4 (11).
* Tape has ended and the MODE-switch is set to sai . The
tape direction is automatically reversed.
The record order is not accepted. +
* Tabs on the cassette have been broken off as described
on page 19.
Aansluiten op het lichtnet
Originele apparaten zijn op 230 Volt/50 en 60 Hz of 120 Volt/
50 en 60 Hz ingesteld. De omschakeling op een andere net-
spanning moet om veiligheidsredenen worden uitgevoerd door
een vakhandelaar of door onze technische dienst.
Vergewis u ervan, alvorens u de netspanning aansluit, dat de
netspanning overeenkomt met de op het typeplaatje aangege-
ven spanningswaarde.
20
Your own recordings are distorted.
* The recording source caused the distortion.
+ The head is dirty (see section “Maintenance and service’).
* The tape selection switch (22) is not set for the type of
tape used.
Your own recordings are noisy.
* Tape is too badly worn.
* (MES switch (26) was not used.
Old recordings are not completely erased.
* Erase head is dirty (see section “Maintenance and service‘).
* The tape selection switch (22) was not set for the type
of tape used.
Unit switches off prematurely during rewind.
* The memory switch (28) is set to ON, the unit switches
off at “000”. Depress Fr (15) or «« (12) until the figures
on
the
index
counter
are
beyond
"0007".
No level indicator on the PEAK LEVEL INDICATOR (29).
* Switch (19) is turned OFF.
Me
can
no
longer
be
controlled
by
means
of
the
buttons
(11)
to (15).
* Disturbances
caused by the power mains. Turn device off
and begin anew.
Technical
data
(typical
values)
The unit exceeds the requirements of DIN 45 500 for domestic
HiFi equipment.
Tape speed 4.75 cm/s
Pitch
Control
range
+4%
Flutter and wow
W.R.M.S. +0.03%
to DIN, playback only +0.06%
to
DIN,
recording/playback
+
0.09
%
Frequency
response
(referring
to
DIN
tolerances)
Standard
Fe
tape
30
—
18
000
Hz
Cr02
tape
30
—
19
000
Hz
FeCr
tape
30
—
19
000
Hz
Pure
metal
tape
30
—
20.000
Hz
Signal-to-noise
ratio (with Dolby NR)
Fe 64 dB
Cro2 64 dB
FeCr 67 dB
Met 67 dB
Channel separation at 1000 Hz
between stereo channels 35 dB
between channels in opposite direction 60 dB
Erasure at 1000 Hz 70dB
Oscillator frequency (push/pull oscillator) 105 kHz
Inputs (sensitivity at O dB)
Microphone (1/4” coax jack)
Receiver/amplifier (DIN jack)
Receiver/amplifier (RCA jacks) 40
Outputs (adjustable)
Receiver/amplifier (DIN jack)
Receiver/amplifier (RCA jacks)
0.25 mV/10 kOhm
0.5 mV/ 6.3 kOhm
mV/82 kOhm
0 — 580 mV/10 kOhm
0 — 580 mV/ 2 kOhm
Headphones (1/4"" coax jack) 4 — 2000 Ohm
Fast wind time for C 60 cassette 65 sec.
Line voltage 115 volt and 230 volt
Line frequency 50/60 Hz
Power consumption 40 W
Aansluiting aan de HiFi-installatie c.q.
weergaveversterker
Aan de achterzijde van het HiFi stereo cassettedeck bevinden
zich de volgende aansluitbussen (Fig. 1):
DIN REC/PB:
Vijfpolige
DIN-steker
voor
opname
een
weergave
voor
aanslui-
ting
aan
versterker
of
receiver
met
kabel
226
816.