Sony XR 1790 User Manual

3-865-584-11 (1)  
FM/AM  
Ca sse t t e Ca r  
St e re o  
US  
Operating Instructions  
Owners 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  
US  
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  
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.  
US  
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.  
13  
Sony Corporation Printed in Malaysia  

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