3-865-584-11 (1)
FM/AM
Ca sse t t e Ca r
St e re o
US
Operating Instructions
Owner’s Record
The model and serial numbers are located on the bottom of the unit.
Record the serial number in the space provided below.
Refer to these numbers whenever you call upon your Sony dealer regarding this
product.
Model No. XR-1790 Serial No.
For installation and connections, see the supplied installation/ connections
manual.
XR-1790
1999 by Sony Corporation
Table of Contents
Location of controls ............................................ 4
Ge t t in g St a rt e d
Setting the clock .................................................. 5
Ca sse t t e Pla ye r
Listening to a tape ............................................... 6
Ejecting the cassette ............................................ 6
Fast-winding the tape ......................................... 6
Radio reception during fast-forwarding or
rewinding of a tape
— ATA (Automatic Tuner Activation)
function ........................................................... 6
Ra d io
Searching for stations automatically
— Automatic tuning ...................................... 7
Tuning in by adjusting the frequency
— Manual tuning ........................................... 7
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Memorizing stations automatically
— Automatic memory function ................... 7
Memorizing only the desired stations ............. 8
Receiving the memorized stations .................... 8
Ot h e r Fu n ct io n s
Adjusting the sound characteristics ................. 8
Enjoying bass and treble at low volume
— Loudness Function ................................... 8
Attenuating the beep tone ................................. 8
Ad d it io n a l In fo rm a t io n
Precautions ........................................................... 9
Maintenance ....................................................... 10
Dismounting the unit ....................................... 11
Specifications ..................................................... 12
Troubleshooting guide ..................................... 13
3
Location of controls
DIR
DSPL
ATA
LCL
1
2
3
4
5
6
A MEM
SEEK
MANU
SEL
LOUD
TUNER
OFF
XR-1790
US
Refer to the pages for further details.
1 Display w indow
7 LCL (local seek) button 7
2 SEL (control mode select) button 5, 8
8
(volume/bass/treble/
3 DSPL (display mode change/time set)
balance/fader control) buttons 5, 8
button 5
9 SEEK/MANU button 7
4 6 (eject) button 6
!º LOUD (loudness) button 8
5 During radio reception:
!¡ TUNER/A MEM (radio on • band select/
Preset number buttons 8
automatic memory) button 7, 8
During tape playback:
!™ OFF button
ATA
1
ATA (Automatic Tuner
Activation) button 6
6 0/) (fast w inding)/DIR (tape
transport direction change) buttons 6
4
DSPL
4 Press the
button momentarily.
Getting Started
The clock activates.
Note
The clock cannot be set unless the power is turned
on. Set the clock after you turn on the radio, or
during tape playback.
Setting the clock
The clock has a 12-hour digital indication.
For example, setting it to 10:08
1 Display the time.
DSPL
(Press the
button during unit
operation.)
DSPL
2 Press the
seconds.
button for more than tw o
The hour digit blinks.
US
Set the hour digits.
(to go back) (to go forw ard)
SEL
3 Press the
button momentarily.
The minute digits blink.
Set the minute digits.
(to go back) (to go forw ard)
5
Fast-winding the tape
Cassette Player
Direction
To advance
To rew ind
indicator*
(
Listening to a tape
Aft e r in se rt in g t h e ca sse t t e , p la yb a ck
w ill st a rt a u t o m a t ica lly.
9
To resume playback, press the other fast-
winding button partially until the locked
button is released.
* The 9 or ( indicator will flash while fast-
winding the tape.
To ch a n g e t h e t a p e d ire ct io n ,
press both the 0 and the ) buttons at the
same time.
US
Radio reception during
fast-forwarding or
Indication of tape transport direction
rewinding of a tape
— ATA (Automatic Tuner Activation) function
ATA
1
The side facing up is being played.
The side facing down is being played.
Pre ss t h e
b u t t o n d u rin g p la yb a ck.
n “ ATA” a p p e a rs o n t h e d isp la y.
When fast-forwarding or rewinding with the
0 or ) button, the tuner will turn on
automatically.
At the end of the tape, the playing direction
w ill change automatically.
Note
Before turning off the unit, eject the tape to avoid
tape damage.
Ejecting the cassette
Press the
button to stop playback and eject
the cassette.
6
Tuning in by adjusting the
frequency — Manual tuning
Radio
1 Select the desired band.
A
MEM
TUNER
Searching for stations
FM1 n FM2 n AM n FM1
automatically
— Automatic tuning
2 Press and hold either side of the SEEK/
MANU button.
1 Select the desired band.
Release the button when the desired station
is received.
A
MEM
TUNER
FM1 n FM2 n AM n FM1
SEEK
MANU
SEEK
MANU
For low er
frequencies
For higher
frequencies
2 Press either side of the SEEK/MANU
button momentarily to search for the
next station (automatic tuning).
PREVENT ACCIDENTS!
SEEK
SEEK
While driving, use the automatic tuning and
the memory preset tuning instead of the
manual tuning.
MANU
MANU
US
For low er
For higher
frequencies
frequencies
The scanning stops when a station is received.
Press either side of the button repeatedly until
the desired station is received.
Memorizing stations
automatically
— Automatic memory function
When an FM stereo program w ith a sufficient
signal strength is tuned in,
ST
Stations with the clearest reception are
automatically searched and memorized on
each band (FM1, FM2 and AM). Up to 6
stations on each band can be stored on the
preset number buttons 1 to 6 in the order of
band frequency.
the “ST” indication will appear.
To avoid the automatic tuning from stopping on
stations too frequently, press the LCL button
momentarily to get the “LCL” indication (local
seek mode).
Only the stations with relatively strong signals will
be tuned in. The local seek mode functions only
when the automatic tuning is in operation.
1 Select the desired band.
A
MEM
TUNER
FM1 n FM2 n AM n FM1
2 Press the TUNER/A MEM button for more
than tw o seconds.
A
MEM
TUNER
The unit will start scanning the selected
band and automatically memorize the
tuned stations on the preset number button
1 through 6.
7
Memorizing only the
desired stations
Other Functions
1 Select the desired band.
A
MEM
TUNER
Adjusting the sound
characteristics
FM1 n FM2 n AM n FM1
2 Tune in the station w hich you w ish to
store on the preset number button.
1 Select the item you w ant to adjust by
SEL
pressing the
button repeatedly.
VOL (volume) n BAS (bass) n TRE
(treble) n BAL (balance) n FAD (fader)
n VOL (volume)
3 Press and hold the desired preset
ATA
1
6
number button (
to
) for about
tw o seconds until you hear a beep tone.
2 Adjust the selected item by pressing
The number of the pressed preset number
button appears in the display window.
either the
or
button.
ST
FM
Adjust within three seconds after selecting.
(After three seconds the button will again
serve as volume control button.)
US
Up to 6 stations on each band (FM1, FM2 and AM)
can be stored on the preset number buttons in the
order of your choice. Therefore, 12 stations can be
memorized on FM.
If you try to store another station on the same
preset number button, the previously stored
station will be erased.
Enjoying bass and treble
at low volume
— Loudness Function
LOUD
Pre ss t h e
b u t t o n . n “ LOUD” w ill
a p p e a r o n t h e d isp la y.
Bass and treble will be boosted. To cancel,
press again.
Receiving the memorized
stations
1 Select the desired band.
A
MEM
TUNER
Attenuating the beep
FM1 n FM2 n AM n FM1
tone
5
Pre ss t h e
b u t t o n w h ile p re ssin g
2 Press momentarily the preset number
button on w hich the desired station is
stored.
SEL
t h e
b u t t o n .
To reactivate the beep tone, press these buttons
once more.
Note
If you press the preset number button for more
than two seconds, the currently received station
will be memorized. To receive the previously
memorized station, make sure that the preset
number button is pressed only momentarily.
8
No t e s o n ca sse t t e s
Cassette care
Additional
• Do not touch the tape surface of a cassette, as
any dirt or dust will contaminate the heads.
• Keep cassettes away from equipment with
built-in magnets such as speakers and
amplifiers, as erasure or distortion on the
recorded tape could occur.
• Do not expose cassettes to direct sunlight,
extremely cold temperatures or moisture.
• When the tape is played back for a long
period, the cassette may become warm
because of the built-in power amplifier. This
is not a sign of a malfunction.
Information
Precautions
• If your car was parked in direct sunlight
resulting in a considerable rise in
temperature inside the car, allow the unit to
cool off before operating it.
• If no power is being supplied to the unit,
check the connections first. If everything is in
order, check the fuse.
• If no sound comes from the speakers of a
2-speaker system, set the fader control to the
center position.
• Slack in the tape may cause the tape to be
caught in the machine. Before you insert the
tape, use a pencil or similar object to turn the
reel and take up any slack.
• If your car is equipped with a power
antenna, note that it will be automatically
extended while the unit is operating.
If you have any questions or problems
concerning your unit that are not covered in
this manual, please consult your nearest Sony
dealer.
US
Slack
• Distorted cassettes and loose labels can cause
problems when inserting or ejecting tapes.
Remove or replace loose labels.
To m a in t a in h ig h q u a lit y so u n d
If you have drink holders near your audio
equipment, be careful not to splash juice or
other soft drinks onto the car audio. Sugary
residues on this unit or cassette tapes may
contaminate the playback heads, reduce the
sound quality, or prevent sound reproduction
altogether.
Cassette cleaning kits cannot remove sugar
from the tape heads.
Notes on cassette deck tape heads
• Long use of cassette tapes contaminates the
tape head causing poor sound quality or
complete sound dropout. Therefore, we
recommend cleaning the tape head once a
month or so with the separately available
Sony Cassette Cleaning Set. If the sound does
not improve after using a cleaning cassette,
please consult your nearest Sony dealer.
• In case of old or inferior cassette tapes, the
tape head gets contaminated much more
quickly. Depending on the tape, one or two
playbacks may cause poor sound.
9
Cassettes longer than 90 minutes
The use of cassettes longer than 90 minutes is
not recommended except for long continuous
play. The tapes used for these cassettes are
very thin and tend to be stretched easily.
Frequent playing and stopping of these tapes
may cause them to be pulled into the cassette
deck mechanism.
Maintenance
Fu se re p la ce m e n t
When replacing the fuse, be sure to use one
matching the amperage rating stated on the
fuse. If the fuse blows, check the power
connection and replace the fuse. If the fuse
blows again after replacement, there may be an
internal malfunction. In such a case, consult
your nearest Sony dealer.
Fuse (10 A)
Warning
Never use a fuse with an amperage rating
exceeding the one supplied with the unit as
this could damage the unit.
US
10
2 Insert a flathead screw driver betw een
the bracket and mounting spring. Gently
pry the spring tow ard the unit w hile
pulling the unit out a little. Repeat on
the opposite side and remove the unit.
Dismounting the unit
1 Insert the supplied tool betw een the unit
and the frame, and rotate 90° to release
the hidden mounting spring. Repeat on
the opposite side and remove the frame.
10 mm (13
/
32
in.)
US
4 mm (3/
16
in.)
90°
11
Specifications
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
13 watts per channel minimum continuous average power into
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more than
1% total harmonic distortion.
Ca sse t t e p la ye r se ct io n
Ge n e ra l
Tape track
4-track 2-channel stereo
Output lead
Power antenna relay
control lead
Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
12 V DC car battery
(negative ground)
Wow and flutter
Frequency response
Signal-to- noise ratio
0.13 % (WRMS)
30 – 15,000 Hz
55 dB
Tone controls
Power requirements
Dimensions
Tu n e r se ct io n
FM
Tuning range
Antenna terminal
Intermediate frequency 10.7 MHz
Approx. 186 × 57 × 176 mm
(7 3/
8
× 2 1/
× 7 in.)
4
87.5 – 107.9 MHz
External antenna connector
(w/ h/ d) not incl.
projecting parts and
controls
Usable sensitivity
Selectivity
Signal-to-noise ratio
9 dBf
Mounting dimension
Approx. 182 × 53 × 163 mm
(7 1/
4
× 2 1/
8
× 6 1/
in.)
2
75 dB at 400 kHz
65 dB (stereo),
68 dB (mono)
US
(w/ h/ d) not incl.
projecting parts and
controls
Approx. 1.2 kg (2 lb. 10 oz.)
Parts for installation and
connections (1 set)
Harmonic distortion at 1 kHz
0.7% (stereo),
Mass
0.4% (mono)
35 dB at 1 kHz
30 – 15,000 Hz
Supplied accessories
Separation
Frequency response
Design and specifications are subject to change
without notice.
AM
Tuning range
Antenna terminal
530 – 1,710 kHz
External antenna connector
Intermediate frequency 450 kHz
Sensitivity 30 µV
Po w e r a m p lifie r se ct io n
Outputs
Speaker outputs
(sure seal connectors)
4 – 8 ohms
Speaker impedance
Maximum power output 35 W × 4 (at 4 ohms)
12
Troubleshooting guide
The following checklist will assist in the correction of most problems which you may encounter with
your unit.
Before going through the checklist below, refer to the connection and operating procedures.
Ge n e ra l
Pro b le m
Ca u se /So lu t io n
No sound
• Adjust the volume with the
button.
• Set the fader control to the center position for 2-speaker
systems.
Indications do not appear in the Remove the front panel and clean the connectors. See “Cleaning
display w indow .
the Connectors” of “Maintenance” for details.
Ta p e p la yb a ck
Pro b le m
Ca u se /So lu t io n
The sound is distorted.
Contamination of the tape head. n Clean the head.
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Ra d io re ce p t io n
Pro b le m
Ca u se /So lu t io n
Preset tuning is not possible.
• Memorize the correct frequency.
• The broadcast is too weak.
Automatic tuning is not possible. The broadcast is too weak. n Use the manual tuning.
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Sony Corporation Printed in Malaysia
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