Dual C 839 RC Notice D'emploi page 20

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.
* 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.
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)
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: