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FM/MW/SW
Cassette Car
Stereo
Operating Instructions
For installation and connections, see the supplied installation/connections
manual.
EN
XR-7850
1998 by Sony Corporation
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EN
Welcome!
Thank you for purchasing the Sony Cassette
Car Stereo. This unit lets you enjoy a variety of
features by using a supplied rotary
commander.
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Page 3
Table of contents
Getting Started
Resetting the unit ................................................ 4
Detaching the front panel .................................. 4
Preparing the rotary commander ..................... 4
Setting the clock .................................................. 5
Cassette Player
Listening to a tape ............................................... 5
Playing a tape in various modes ....................... 6
Radio
Memorizing stations automatically
— Best Tuning Memory (BTM) ................... 7
Memorizing only the desired stations ............. 7
Receiving the memorized stations.................... 7
Other Functions
Using the rotary commander ............................ 8
Adjusting the sound characteristics ................. 9
Attenuating the sound ....................................... 9
Changing the sound and beep tone ................. 9
Additional Information
Precautions ......................................................... 10
Maintenance ....................................................... 11
Dismounting the unit ....................................... 12
Location of controls .......................................... 13
Specifications ..................................................... 14
Troubleshooting guide ..................................... 15
Index ................................................................... 16
EN
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Getting Started
Resetting the unit
Before operating the unit for the first time or
after replacing the car battery, you must reset
the unit.
Press the reset button with a pointed object,
such as a ball-point pen.
Reset button
Note
Pressing the reset button will erase all the memorized
program and memory functions.
EN
Detaching the front panel
The front panel of this unit can be detached to
prevent the unit from being stolen.
1 Press (OFF).
2 Press (RELEASE) to detach the front
panel then gently pull it out.
(RELEASE)
Attaching the front panel
Attach part A of the front panel to part B of
the unit as illustrated and push until it clicks.
A
B
Notes
• Make sure the front panel is the right way up when
attaching it to the unit as it cannot be attached upside
down.
• Do not press the front panel hard against the unit when
attaching it to the unit. It can easily be attached by
pressing it lightly against the unit.
• When you carry the front panel with you, put it in the
supplied front panel case.
• Do not press hard or put excessive pressure to the display
windows of the front panel.
• Do not expose the front panel to direct sunlight, heat
sources such as hot air ducts or leave it in a humid place.
Never leave it on the dashboard etc. of a car parked in
direct sunlight where there may be a considerable rise in
temperature inside the car.
Caution alarm
If you turn the ignition key to the OFF position
without removing the front panel, the caution
alarm will beep for a few seconds (only when
the POWER SELECT switch is set to the A
position). If you connect an optional power
amplifier to the LINE OUT and do not use the
built-in amplifier, the beep tone will be
disabled.
Notes
• Be sure not to drop the panel when detaching it from the
unit.
• If you press (RELEASE) to detach the panel while the
unit is still turned on, the power will automatically turn
off to protect the speakers from being damaged.
4
Preparing the rotary
commander
When you mount the rotary commander,
attach the label in the illustration below.
D
S
P
L
E
S
E
D
O
M
L
P
S
D
L
M
O
D
E
S
E
L
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Setting the clock
The clock has a 12-hour digital indication.
For example, setting it to 10:08
Cassette Player
1 Press (OFF) or (DSPL) during operation.
2 Press (DSPL) for two seconds.
100
The hour digit flashes.
1 Set the hour digits.
1000
2 Press (SEL) momentarily.
1000
The minutes digits flashes.
3 Set the minute digits.
1008
To go forward
To go backward
To go forward
To go backward
3 Press (DSPL) momentarily.
1008
The clock starts.
Note
If the POWER SELECT switch on the bottom of the unit is
set to the B position, the clock cannot be set unless the
power is turned on. Set the clock after you have turned on
the radio.
Listening to a tape
Insert a cassette.
Playback will start automatically.
If a cassette is already inserted, press
(SOURCE) repeatedly until “TAPE” is
displayed.
TAPE
The side facing up is being played.
TAPE
The side facing down is being played.
Tip
To change the tape transport direction, press (MODE)
(*) during tape playback.
To
Stop playback
Eject the cassette
Fast-winding the tape
During playback, press either side of
(SEEK/AMS) for two seconds.
Fast-forward
SEEK
AMS
Rewind
Press
(OFF)
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EN
Getting Started/Cassette Player
To start playback during fast-forwarding or
rewinding, press (MODE) (*).
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Locating the beginning of a track
— Automatic Music Sensor (AMS)
You can skip up to nine tracks at one time.
During playback, press either side of
(SEEK/AMS) momentarily.
To locate the succeeding tracks
SEEK
AMS
To locate the preceding tracks
Note
The AMS function may not work when :
• the blanks between tracks are shorter than 4 seconds
• there is noise between tracks
• there are long sections of low volume or quiet sections.
Changing the displayed items
Each time you press (DSPL) during tape
playback, the displayed item changes as
follows:
z Tape playback z Clock z Frequency*
EN
* While the ATA function is activated.
Playing a tape in various
modes
Switching to the radio while fastwinding a tape
— Automatic Tuner Activation (ATA)
Press (5) during playback.
“ATA” appears on the display.
When fast-forwarding or rewinding with
(SEEK/AMS), the tuner will turn on
automatically.
To cancel this mode, press (5) again.
Skipping blanks during tape
playback — Blank skip
Press (6) during playback.
“BL SKIP” appears on the display.
Blanks longer than eight seconds will
automatically be skipped during tape
playback.
To cancel this mode, press (6) again.
Searching for the desired track
— Intro scan
Press (1) during playback.
“INTRO” appears on the display.
The first 10 seconds of all the tracks are played.
When you find the desired track, press (1)
again. The unit returns to the normal playback
mode.
To cancel this mode, press (1) again.
Playing tracks repeatedly
— Repeat play
Press (2) during playback.
“REP” appears on the display.
When the current played track is over, it will
be played again from the beginning.
To cancel this mode, press (2) again.
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Radio
Memorizing stations
automatically
— Best Tuning Memory (BTM)
This function selects from the currently
received band the stations with the strongest
signals and memorizes them in order of their
frequency.
PREVENTING ACCIDENTS!
When tuning in while driving, use the
automatic tuning instead of manual tuning.
Memorizing only the
desired stations
Up to 6 stations on each band (FM1, FM2, FM3,
MW, SW1 and SW2) can be stored on the
preset number buttons in the order of your
choice. Therefore, 18 FM stations can be
memorized.
If you try to store another station on the same
preset number button, the most recently stored
station will be erased.
1 Press (SOURCE) repeatedly to select the
tuner.
2 Press (MODE) repeatedly to select the
band.
1 Press (SOURCE) repeatedly to select the
tuner.
Each time you press (SOURCE), the source
changes as follows:
TAPE ˜ TUNER
2 Press (MODE) repeatedly to select the
band.
Each time you press (MODE), the band
changes as follows:
FM1 n FM2 n FM3 n MW n SW1 n SW2
3 Press (BTM) for two seconds.
Notes
• The unit will not store stations with weak signals on the
preset number buttons. If there are only a few stations
received, some preset number buttons will remain empty.
• When a preset number indicated on the display, the unit
starts storing station from the one currently display.
3 Press (SEEK/AMS) to search for the
station you wish to store on a preset
number button.
4 Press the desired preset number button
((1) to (6)) for two seconds.
The number of the selected preset number
button appears on the display.
Receiving the memorized
stations
1 Press (SOURCE) repeatedly to select the
tuner.
2 Press (MODE) repeatedly to select the
band.
3 Press the preset number button
momentarily ((1) to (6)) on which the
desired station is stored.
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Cassette Player/Radio
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Changing the displayed items
Each time you press (DSPL), the display
changes between the frequency and the clock.
If you cannot tune in a preset
station
Press either side of (SEEK/AMS)
momentarily to search for the station
(automatic tuning).
Scanning stops when a station is received.
Press either side of (SEEK/AMS) repeatedly
until the desired station is received.
Note
If the automatic tuning stops too frequently, press
(LCL) to lights up “LCL” on the display (local seek mode).
Only the stations with relatively strong signals can be
tuned in.
Tip
If you know the frequency, press and hold either side of
(SEEK/AMS) until the desired station is received (manual
tuning).
EN
Other Functions
Using the rotary
commander
The rotary commander works by pressing
buttons and/or rotating controls.
By pressing buttons (the SOURCE
and the MODE buttons)
(SOURCE)
(MODE)
Every time you press (SOURCE), the
source changes as follows:
TAPE n TUNER
Pressing (MODE) changes the operation in the
following ways:
• the tape transport direction.
• the band, FM1 n FM2 n FM3 n MW n
SW1 n SW2.
Tip
You can turn on this unit by pressing (SOURCE) on the
rotary commander.
By rotating the control (the SEEK/
AMS control)
Rotate the control momentarily and
release it to:
• Locate the beginnings of the tracks on the
tape. Rotate and hold the control, and
release it to fast-wind the tape. To
playback, rotate and hold the control
again, and release it.
• Tune in the stations automatically.
Rotate and hold the control to tune in the
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specific station.
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By rotating the control while
0dB
D-BASS 3
D-BASS 2
D-BASS 1
pushing in (the PRESET/DISC
control)
Adjusting the sound
characteristics
1 Select the item you want to adjust by
pressing (SEL) repeatedly.
VOL (volume) n BAS (bass) n TRE
(treble) n BAL (left-right) n FAD
(front-rear)
Push in and rotate the control to:
Receive the stations memorized on the
preset buttons.
Other operations
Rotate the VOL control
to adjust the volume.
Press (DSPL) to change
the display items.
Press (ATT)to
attenuate the
sound.
OFF
Press(OFF) to
turn off the unit.
Press (SEL)
to adjust
and select.
Changing the operative direction
The operative direction of controls is factory
preset as in the illustration below.
To increase
To decrease
If you need to mount the rotary commander
on the right side of the steering column, you
can reverse the controls‘ operative direction.
2 Adjust the selected item by pressing
either (+) or (–).
Adjust within three seconds after selecting.
(After three seconds the button will again
serve as the volume control button.)
Attenuating the sound
Press (ATT).
The “ATT” indication flashes.
To restore the previous volume level, press
again.
Tip
The unit decreases the volume automatically when a
telephone call comes in (Telephone-ATT function).
Changing the sound and
beep tone
Boosting the bass sound — D-Bass
You can enjoy clear and powerful bass sound.
The D-bass function boosts the low frequency
singal with a sharper curve than conventional
bass boost.
You can hear the bass line more clearly even if
the vocal volume remains the same. You can
emphasize and adjust the bass sound easily
with the D-bass control. This effect is similar to
the one you get when you use an optional
subwoofer system.
Analog D-BASS
EN
Radio/Other Functions
Press (SEL) for two seconds while
pushing in the VOL control.
Level
Frequency (Hz)
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Adjusting the bass curve
Turn the D-BASS control to adjust the
bass level (1, 2 or 3).
“D-BASS” appears in the display.
To cancel, turn the control to the OFF position.
Additional
Information
Note
If the bass sound becomes distorted, adjust the D-BASS
control or the volume button.
Attenuating the beep tone
Press (6) while pressing (SEL).
To obtain the beep tone again, press these
buttons again.
Note
If you connect an optional power amplifier to the LINE
OUT and do not use the built-in amplifier, the beep tone
will be disabled.
EN
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.
• When the tape is played back for a long
period, the cassette may become warm
because of the built-in power amplifier.
However, this is not a sign of malfunction.
If you have any questions or problems
concerning your unit that are not covered in
this manual, please consult your nearest Sony
dealer.
To maintain high quality sound
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.
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Notes on Cassettes
Cassette care
• 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.
• 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.
Maintenance
Fuse Replacement
When replacing the fuse, be sure to use one
matching the amperage rating stated on the
original 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)
Slack
• Distorted cassettes and loose labels can cause
problems when inserting or ejecting tapes.
Remove or replace loose labels.
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.
Warning
Never use a fuse with an amperage rating
exceeding the one supplied with the unit as
this could damage the unit.
Cleaning the Connectors
The unit may not function properly if the
connectors between the unit and the front
panel are not clean. In order to prevent this,
open the front panel by pressing (RELEASE),
then detach it and clean the connectors with a
cotton swab dipped in alcohol. Do not apply
too much force. Otherwise, the connectors may
be damaged.
Main unit
EN
Other Functions/Additional Information
Back of the front panel
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Page 12
Dismounting the unit
1
2
3
4
EN
Release key (supplied)
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Page 13
Location of controls
SOURCE
SEEK
AMS
RELEASE
MODE
ATT
OFF
SEL
Refer to the pages for further details.
1 SEEK/AMS button 5, 6, 7, 8
2 SOURCE button (TAPE/TUNER) 5, 7
3 (+)(–) (volume/bass/treble/left-right/
front-rear control) button 5, 9
4 MODE (*) button
During tuner reception:
BAND select 7
During tape playback:
Transport direction change 5
5 OFF button 4, 5
6 6 (eject) button 5
7 During radio reception:
Preset number buttons 7
During tape playback:
(1) INTRO button 6
(2) REPEAT button 6
(5) ATA (Automatic Tuner
Activation) button 6
(6) BL SKIP (Blank Skip) button 6
8 RELEASE (front panel release) button
4, 11
9 Reset button (located on the front side
of the unit hidden by the front panel)
Press this button when you use this unit
for the first time, when you have changed
the car battery, or when the buttons of this
unit do not function properly.
INTRO REPEAT
213
ATA BL SKIP
546
BTM LCL
DSPL
D-BASS
OFF
1
2
3
0 ATT button 9
!¡ SEL (control mode select) button 5, 9, 10
!™ POWER SELECT switch (located on the
bottom of the unit)
See “POWER SELECT Switch” in the
Installation/Connections manual.
!£ Frequency Select switch (located on the
bottom of the unit)
See “Frequency Select Switch” in the
Installation/Connections manual.
!¢ Display window
!∞ BTM (Best tuning memory) button 7
!§ DSPL (display mode change/time set)
button 5, 6, 8
!¶ LCL button 8
!• D-BASS control 9
When the positions of switch !™ and !£ is
altered, be sure to press the reset button after
connecting power.
EN
Additional Information
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Specifications
Cassette player section
Tape track 4-track 2-channel stereo
Wow and flutter 0.08 % (WRMS)
Frequency response 30 – 18,000 Hz
Signal-to-noise ratio 58 dB
Tuner section
FM
Tuning range FM tuning interval:
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity 8 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),
Harmonic distortion at 1 kHz
EN
Separation 35 dB at 1 kHz
Frequency response 30 – 15,000 Hz
Capture ratio 2 dB
MW
Tuning range MW tuning interval:
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450kHz
Sensitivity 30 µV
SW
Tuning range SW tuning interval:
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450kHz
Sensitivity 50 µV
50 kHz/200kHz switchable
87.5 – 108.0 MHz
(at 50 kHz step)
87.5 – 107.9 MHz
(at 200 kHz step)
68 dB (mono)
0.5 % (stereo),
0.3 % (mono)
9kHz/10kHz switchable
531 – 1,602kHz
(at 9kHz step)
530 – 1,710kHz
(at 10kHz step)
SW1 :2,940 – 7,735kHz
SW2 :9,500 – 18,135kHz
(except for 10,140 –
11,575kHz)
General
Outputs Power antenna control
lead/Power amplifier
control lead/Telephone
ATT control lead
Rear line out (1)
Tone controls Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
Power requirements 12 V DC car battery
(negative ground)
Dimensions Approx. 188 × 58 × 181
mm (w/h/d)
Mounting dimensions Approx. 182 × 53 × 164 mm
(w/h/d)
Mass Approx. 1.2 kg
Supplied accessories Parts for installation and
connections (1 set)
Front panel case (1)
Rotary commander
RM-X4S (1)
Design and specifications are subject to change without
notice.
Power amplifier section
Outputs Speaker outputs
Speaker impedance 4 – 8 ohms
Maximum power output 35 W × 4 (at 4 ohms)
(sure seal connectors)
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Troubleshooting guide
The following checklist will assist in the correction of most problems you may encounter with your
unit.
Before going through the checklist below, refer to the operating procedures.
General
Problem
No sound.
Indications do not appear on
the display.
No beep tone.
Tape playback
Problem
Playback sound is distorted.
The AMS does not operate
correctly.
Cause/Solution
• Adjust the volume with (+).
• Set the fader control to the center position for 2-speaker
systems.
Remove the front panel and clean the connectors. See “Cleaning
the Connectors” in “Maintenance” for details.
• An optional power amplifier is connected to the LINE OUT
and you are not using the built-in amplifier.
• The beep tone is attenuated.
Cause/Solution
Contamination of the tape head. n Clean the head.
• There is noise in the space between tracks.
• A blank space is too short (less than four seconds).
• + on (SEEK/AMS) is pressed immediately before the
following track.
• = on (SEEK/AMS) is pressed immediately after the track
starts.
• A long pause, or a passage of low frequencies or very low
sound level is treated as a blank space.
EN
Additional Information
Radio reception
Problem
Preset tuning is not possible.
Automatic tuning is not possible.
If the above-mentioned solutions do not help to improve the situation, consult your nearest Sony
dealer.
Cause/Solution
• Store the correct frequency.
• The broadcast is too weak.
The broadcast is too weak. n Use manual tuning.
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EN
Index
A
ATT 9
Automatic Music Sensor (AMS) 6
Automatic tuning 8
Automatic Tuner Activation (ATA) 6
B
BAL (left-right) 9
BAS (bass) 9
Best Tuning Memory (BTM) 7
Blank skip 6
C
Caution alarm 4
Clock 5
D, E
D-BASS (D-Bass) 9
Display 6
F, G, H
FAD (front-rear) 9
Fast-forward 5
Front panel 4
Fuse 11
I, J, K
Intro scan 6
L
Local seek mode (LCL) 8
M, N, O, P, Q
Manual tuning 8
R, S
Radio 7
Repeat play 6
Reset 4
Rewind 5
Rotary commander 4, 8
T, U, V, W, X, Y, Z
Tape playback 5
Telephone-ATT 9
TRE (treble) 9
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