Panasonic Cd Stereo System Sc-pm23 Operating Instructions

							Operating Instructions
CD Stereo System
Model No. SC-PM23
RQTV0080-1P
As an ENERGY STAR® Partner∗
, 
Panasonic has determined that this 
product meets the ENERGY STAR
® 
guidelines for energy ef ciency.
∗
For Canada only: The word “Participant” is used in place 
of the word “Partner”.
Before connecting, operating or adjusting this product, please 
read the instructions completely.
Please keep this manual for future reference.
Operations in these instructions are described using remote 
control, but you can do the operations with the main unit if the 
controls are the same.
Your unit may not look exactly as illustrated.
La guía rápida en español se encuentra en la página 18 - 23.
Table of contents
IMPORTANT SAFETY 
INSTRUCTIONS ..............................   3
Listening caution ................................   3
Getting started ....................................   4
Placement of speakers .......................  5
Overview of controls ..........................   6
Discs ....................................................   7
Cassette tape ......................................   9
Radio ....................................................  10
Timer ....................................................   11
Sound adjustment ..............................  13
External unit ........................................  13
Troubleshooting guide .......................  14
Specifi cations .....................................  15
Maintenance ........................................   15
Limited Warranty 
(ONLY FOR U.S.A.) .........................  16
Limited Warranty 
(ONLY FOR CANADA) ....................  17
Product Service ..................................  17
PPC
SUPPLIED ACCESSORIESSUPPLIED ACCESSORIES
Please check and identify the supplied accessories.
Use numbers indicated in parentheses when asking for 
replacement parts. (As of December 2005)
In the U.S.A. to order accessories, refer to “Accessory 
Purchases” on page 16.
1 x Remote control 
(N2QAYB000005)
1 x AM loop antenna
(N1DAAAA00001)
1 x AC power supply cord
(K2CB2CB00018)
1 x FM indoor antenna
(RSA0007-L)
2 x Remote control batteries 
EspañolEspañol
Preparativos iniciales .........................  18
Colocación de los altavoces .............  18
Controles .............................................   19
Discos ..................................................   20
Cintas de casete .................................  21
Radio ....................................................  22
Temporizador ......................................  23
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Dear customerThank you for purchasing this product.
For optimum performance and safety, please read these 
instructions carefully.
These operating instructions are applicable to the following 
system.
SystemSC-PM23
Main unit SA-PM23
Speakers SB-PM23
The model number and serial number of this product can 
be found on either the back or the bottom of the unit.
Please note them in the space provided below and keep 
for future reference.
MODEL NUMBER 
SERIAL NUMBER 
User memo:
DATE OF PURCHASE 
DEALER NAME 
DEALER ADDRESS 
TELEPHONE NUMBER 
WARNING:
TO REDUCE THE RISK OF FIRE, ELECTRIC 
SHOCK OR PRODUCT DAMAGE, DO NOT 
EXPOSE THIS APPARATUS TO RAIN, 
MOISTURE, DRIPPING OR SPLASHING AND 
THAT NO OBJECTS FILLED WITH LIQUIDS, 
SUCH AS VASES, SHALL BE PLACED ON 
THE APPARATUS.
CAUTION!THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUSTMENTS OR
PERFORMANCE OF PROCEDURES OTHER 
THAN THOSE SPECIFIED HEREIN MAY RESULT 
IN HAZARDOUS RADIATION EXPOSURE.
DO NOT OPEN COVERS AND DO NOT REPAIR 
YOURSELF. REFER SERVICING TO QUALIFIED 
PERSONNEL.
CAUTION!DO NOT INSTALL OR PLACE THIS UNIT IN 
A BOOKCASE, BUILT-IN CABINET OR IN 
ANOTHER CONFINED SPACE. ENSURE THE 
UNIT IS WELL VENTILATED. TO PREVENT RISK 
OF ELECTRIC SHOCK OR FIRE HAZARD DUE TO 
OVERHEATING, ENSURE THAT CURTAINS AND 
ANY OTHER MATERIALS DO NOT OBSTRUCT 
THE VENTILATION VENTS.
The socket outlet shall be installed near the equipment 
and easily accessible or the mains plug or an appliance 
coupler shall remain readily operable.
The lightning flash with arrowhead symbol,
within an equilateral triangle, is intended to
alert the user to the presence of uninsulated
dangerous voltage within the product s
enclosure that may be of sufficient
magnitude to constitute a risk of electric
shock to persons. CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE SCREWS.
NO USER-SERVICEABLE PARTS
INSIDE.
REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.
The exclamation point within an equilateral
triangle is intended to alert the user to the
presence of important operating and
maintenance (servicing) instructions in the
literature accompanying the appliance.
THE FOLLOWING APPLIES ONLY IN THE U.S.A.
FCC Note:This equipment has been tested and found to comply 
with the limits for a Class B digital device, pursuant to 
Part 15 of the FCC Rules.
These limits are designed to provide reasonable 
protection against harmful interference in a residential 
installation. This equipment generates, uses and can 
radiate radio frequency energy and, if not installed and 
used in accordance with the instructions, may cause 
harmful interference to radio communications. However, 
there is no guarantee that interference will not occur in 
a particular installation. If this equipment does cause 
harmful interference to radio or television reception, 
which can be determined by turning the equipment off 
and on, the user is encouraged to try to correct the 
interference by one or more of the following measures:
  Reorient or relocate the receiving antenna.
  Increase the separation between the equipment and 
receiver.
  Connect the equipment into an outlet on a circuit 
different from that to which the receiver is connected.
  Consult the dealer or an experienced radio/TV 
technician for help.
Any unauthorized changes or modifications to this 
equipment would void the user’s authority to operate 
this device.
This device complies with Part 15 of the FCC Rules. 
Operation is subject to the following two conditions: 
(1) This device may not cause harmful interference, and 
(2) this device must accept any interference received, 
including interference that may cause undesired 
operation.
Responsible Party:
Panasonic Corporation of North America
One Panasonic Way
Secaucus, NJ 07094
Telephone No.: 1-800-211-7262
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ENGLISH English English
IMPORTANT SAFETY INSTRUCTIONS
Read these operating instructions carefully before using the unit. Follow the safety instructions on the unit and the 
applicable safety instructions listed below. Keep these operating instructions handy for future reference.
Listening caution
%34
Selecting  ne audio equipment such as the unit you’ve 
just purchased is only the start of your musical enjoyment. 
Now it’s time to consider how you can maximize the fun 
and excitement your equipment offers. This manufacturer 
and the Electronic Industries Association’s Consumer 
Electronics Group want you to get the most out of your 
equipment by playing it at a safe level. One that lets the 
sound come through loud and clear without annoying blaring 
or distortion—and, most importantly, without affecting your 
sensitive hearing.
We recommend that you avoid prolonged exposure to 
excessive noise.
Sound can be deceiving. Over time your hearing “comfort 
level” adapts to higher volumes of sound. So what sounds 
“normal” can actually be loud and harmful to your hearing.
Guard against this by setting your equipment at a safe level 
BEFORE your hearing adapts.
To establish a safe level:
  Start your volume control at a low setting.
  Slowly increase the sound until you can hear it comfortably 
and clearly, and without distortion.
Once you have established a comfortable sound level:
  Set the dial and leave it there.
Taking a minute to do this now will help to prevent hearing 
damage or loss in the future. After all, we want you listening 
for a lifetime.-If you see this symbol-
Information on Disposal in other Countries outside the 
European Union
This symbol is only valid in the European Union.
If you wish to discard this product, please contact 
your local authorities or dealer and ask for the 
correct method of disposal.
Except for U.S.A.
Inside of product 10) Protect the power cord from being walked on or 
pinched particularly at plugs, convenience receptacles, 
and the point where they exit from the apparatus.
11) Only use attachments/accessories specified by the
manufacturer.
12) Use only with the cart, stand, tripod, 
bracket, or table specified by the 
manufacturer, or sold with the 
apparatus. When a cart is used, use 
caution when moving the cart/apparatus 
combination to avoid injury from tip-
over.
13)  Unplug this apparatus during lightning storms or when 
unused for long periods of time.
14) Refer all servicing to qualified service personnel. 
Servicing is required when the apparatus has been 
damaged in any way, such as power-supply cord or 
plug is damaged, liquid has been spilled or objects 
have fallen into the apparatus, the apparatus has 
been exposed to rain or moisture, does not operate 
normally, or has been dropped.
1)  Read these instructions.
2)  Keep these instructions.
3)  Heed all warnings.
4)  Follow all instructions.
5)  Do not use this apparatus near water.
6)  Clean only with dry cloth.
7)  Do not block any ventilation openings. Install in 
accordance with the manufacturer’s instructions.
8)  Do not install near any heat sources such as radiators, 
heat registers, stoves, or other apparatus (including 
amplifiers) that produce heat.
9)  Do not defeat the safety purpose of the polarized or 
grounding-type plug. A polarized plug has two blades 
with one wider than the other. A grounding-type plug 
has two blades and a third grounding prong. The wide 
blade or the third prong are provided for your safety. If 
the provided plug does not fit into your outlet, consult 
an electrician for replacement of the obsolete outlet.
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Getting started
Step Step 11 - Making the connections - Making the connections
Connect the AC power supply cord only after all other connections have been made.
Optional antenna connectionsOptional antenna connections
FM outdoor antenna AM outdoor antenna
FM outdoor antenna 
(not included)
75 Ω coaxial cable 
(not included)
 
AM outdoor antenna 
  (not included)
AM loop antenna 
  (included)(16-
 40 ft.)
  Never use an outdoor antenna during a lightning storm. 
  You can connect the FM outdoor antenna for better reception. Please consult your dealer for installation.
  Disconnect the FM indoor antenna if an FM outdoor antenna is installed.
  Connect the AM outdoor antenna without removing the AM loop antenna. Run 5 to 12
 m (16 to 40 feet) of vinyl-covered wire 
horizontally along a window or other convenient location.
4 Connect the AC power supply cord.
The included AC power supply cord is for use with this 
unit only. Do not use it with other equipment. 
3 Connect the speaker cords.
Incorrect connection can damage the unit.
2 Connect the FM indoor antenna.
Tape the antenna to a wall or column, in a 
position with least amount of interference.
Adhesive 
tape
FM indoor 
antenna
FM ANT
75
1 Connect the AM loop antenna.
Stand the antenna up on its base. Keep the loose antenna cord 
away from other wires and cords.
Black (·)Black (·)Red (ª) AM loop antenna
Red (ª)
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ENGLISH English English
Step 2Step 2 - Inserting batteries into the remote control - Inserting batteries into the remote control
■ Batteries
  Insert so the poles (+ and –) match those in the remote control.
  Remove if the remote control is not going to be used for a long period of 
time. Store in a cool, dark place.
  Do not use rechargeable type batteries.
  Mishandling of batteries in the remote control can cause electrolyte 
leakage, which may cause a  re.
Do not:
  mix old and new batteries;
  use different types of batteries at the same time;
  heat or expose to  ame;
  take apart or short-circuit;
  attempt to recharge alkaline or manganese batteries;
  use batteries if their covering has been peeled off.
■ Use
  Aim at the remote control sensor, avoiding obstacles, at a maximum 
range of 7
 m (23 feet) directly in front of the unit.
  Refer to page 6 for remote control signal sensor position.
SStep 33 - DEMO function - DEMO function
When the unit is  rst plugged in, a demonstration of its functions may be 
shown on the display.
If the demo setting is off, you can show a demonstration by selecting 
“DEMO ON”.
Press and hold [7, -DEMO].
The display changes each time the button is held down.
$%-//&& $%-//.
While in standby mode, select “DEMO OFF” to reduce power 
consumption.
Placement of speakers
Speakers are designed identically so that no left or right channel orientation is necessary.
Use only the supplied speakers.
The combination of the main unit and speakers provide the best sound. Using other speakers can damage the unit and sound 
quality will be negatively affected.
Note  Keep your speakers at least 10 mm (13/32) away from the system for proper ventilation.
  These speakers do not have magnetic shielding. Do not place them near televisions, personal computers or other devices easily in uenced 
by magnetism.
  You cannot take the front net off the speakers.
Caution
•  Use the speakers only with the recommended system. Failure to do so can damage the amplifi er and 
speakers, and can cause fi re. Consult a qualifi ed service person if damage occurs or if a sudden 
change in performance is apparent.
•  Do not attach these speakers to walls or ceilings.
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Overview of controls
Main unitMain unit
Refer to the numbers in parentheses for page reference.
Disc lid (7, 9)
Remote control sensor 
Music port jack (13)
Stop/Demo (5, 7, 8, 9)
7 Tuner/Band selection (10) Cassette lid (9)Headphone jack (PHONES) 
Avoid listening for prolonged 
periods of time to prevent 
hearing damage.
Plug type: 3.5
 mm (1/8) stereo
(not included)
Disc lid open/close (7, 9)
Display panel
5 Volume control Recording start/pause (9, 13)
2 Disc play/pause (7, 8) 
3 Tape play (9) 
Cassette lid open (9)Disc skip/search, tape fast-
forward/rewind, tune/preset 
channel selection, time 
adjustment, bass/treble 
adjustment
6 Music port selection (13) 4 Bass/Treble selection (13)
Top of unit
AC supply indicator (AC IN)This indicator lights when the unit is 
connected to the AC power supply.
1 Standby/on switch (y/l, POWER) (7, 12)Press to switch the unit from on to standby mode 
or vice versa. In standby mode, the unit is still 
consuming a small amount of power.
It takes a few seconds to turn on the unit after 
connecting to the AC power supply. Note:
Remote controlRemote control
Buttons such as 1 function the same as the controls on the main unit.
1Clock/Timer (11, 12)
Play timer/Record timer (12)
Numeric (7, 8, 10)
Delete (8)
Stop (7, 8, 9)
Disc skip/search, tape fast-
forward/rewind, tune/preset 
channel selection, time 
adjustment, bass/treble 
adjustment (7 to 13)
Muting
Auto off Program (8)
Clear (8)
Play mode (7)
Repeat (8)
7
Enter (8)
Surround (13)
Display (7)
Dimmer Sleep timer (11)
4
Preset EQ (13) 5 2
Album selection (7, 8)6
3
 
This function allows you to 
turn off the unit in disc or 
tape mode only after left 
unused for 10 minutes.
The setting is maintained 
even if the unit is turned 
off.
Dims the display panel.
Mutes the sound.
  Press the button to activate.
  Press again to cancel.
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ENGLISH English English
Basic playBasic play
CD MP3 WMA
1Press [y] to turn the unit on.
2Push [CD OPEN/CLOSE 0] to open the disc lid and 
then insert the disc. Close the lid.
Disc lid
Label must face upward
3Press [CD 6] to start play.
4Adjust the volume.
To Action
stop the discPress [ 7 ].
pause play Press [CD 6]. Press again to 
resume play.
skip tracks  Press 
[/REW/4] or [/FF/¢].
search through tracks
CDPress and hold [/REW/4] or 
[/FF/¢] during play or pause.
skip album
MP3 WMAPress [ALBUM  or ] in the play 
mode.
Press [ALBUM 
 or ] once and 
then the numeric buttons in the stop 
mode.
Play Mode functionPlay Mode function
CD MP3 WMA
1Press [CD 6].
2Press [PLAY MODE] to select the desired mode.
Mode To play
1-TRACK
1TRone selected track on the disc.
Press the numeric buttons to select the 
track.
1-ALBUM 
1ALBUMMP3 WMA
one selected album on the disc.
Press [ALBUM  or ] to select the 
album.
RANDOM
RNDa disc randomly.
1-ALBUM RANDOM
1ALBUM RNDMP3 WMA
all tracks in one selected album randomly.
Press [ALBUM  or ] to select the 
album.
Note  During RANDOM or 1-ALBUM RANDOM play, you cannot skip to 
tracks that have been played.
CD  During RANDOM play, you can search backward or forward only 
within the current track.
Display functionDisplay function
This function allows you to display the information of the 
current track.
Press [DISPLAY] repeatedly during play or pause mode.
CD
Elapsed play time  Remaining play time 
MP3 WMA
 Elapsed time  Album name  Track name
Tag (Artist)
  Tag (Track)   Tag (Album)
Note  Maximum number of displayable characters: approximately 30
 This unit supports ver. 1.0 & 1.1 ID3 tags. Text data that is not 
supported will not be displayed.
  ID3 is a tag embedded in MP3 tracks to provide information about 
the track.
Discs
Disc lid
CD OPEN/CLOSE 0 Numeric 
buttonsTop of unit
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Advanced playAdvanced play
Direct access playDirect access play
This function allows you to start play from a speci c track.
CD
Press the numeric buttons to select and play your 
desired track.
MP3 WMA
1Press [ALBUM  or ] to select the album.
2Press [ /FF/¢] once and then the numeric 
buttons to select and play your desired track.
For two-digit track, press [h10] once, and then the two digits.For three-digit track, press [h10] twice, and then the three digits.
NoteThis function does not work during any random/program mode.
Repeat playRepeat play
You can repeat program play or other selected play mode.
CD MP3 WMA
Press [REPEAT] before or during play.
“REPEAT ON” and “  ” are displayed.
To cancel
Press [REPEAT] again.
“REPEAT OFF” is displayed and “ 
 ” is cleared.
Program playProgram play
This function allows you to program up to 24 tracks.
CD
1Press [CD 6] and then [ 7 ].
2Press [PROGRAM].
3Press the numeric buttons to select your desired 
track.
Repeat this step to program other tracks.
Example:
Track number
Program number
Program indicator
4Press [CD 6] to start play.
MP3 WMA
1Press [CD 6] and then [ 7 ].
2Press [PROGRAM].
3Press [ALBUM  or ] to select your desired 
album.
4Press [ /FF/¢] once and then the numeric 
buttons to select your desired track.
Example:
Album number
Track number
5Press [ENTER] to store the program.
Repeat steps 3 to 5 to program other tracks.
6Press [CD 6] to start play.
To Action
cancel program 
modePress [PROGRAM] in the stop mode. 
replay the program Press [PROGRAM] then [CD 6].
check program 
contentsPress 
[/REW/4] or [/FF/¢] when 
“PGM” is displayed in the stop mode.
To check while programming, press 
[PROGRAM] twice after “PGM” appears, 
then press 
[/REW/4] or [/FF/¢].
add to the program
CDRepeat step 3 in the stop mode.
MP3 WMARepeat steps 3 to 5 in the stop mode.
clear the last track Press [DEL] in the stop mode.
clear all 
programmed tracksPress [CLEAR] in the stop mode.
“CLR ALL” is displayed.
Note When you try to program more than 24 tracks, “PGM FULL” 
appears.
  The program memory is cleared when you open the disc lid.
CDDuring program play, you can search backward or forward only within 
the current track.
Discs (continued)
Note  This unit can play MP3 or WMA  les and CD-DA format audio CD-
R/RWs that have been  nalized.
 It may not be able to play some CD-R/RWs, depending on the 
condition of the recording.
  Do not use irregularly shaped discs.
  Do not use discs with labels and stickers that are coming off or with 
adhesive exuding from under labels and stickers.
  Do not attach extra labels or stickers on the disc.
  Do not write anything on the disc.
CD
  This unit can access up to 99 tracks.
  Choose a CD with this mark:
 
Using DualDiscs
The “CD” sides of DualDiscs do not meet the CD-DA standard so it 
may not be possible to play them on this unit.
MP3 WMA  Files are treated as tracks and folders are treated as albums.
 This unit can access up to 999 tracks, 255 albums and 20 sessions.  Disc must conform to ISO9660 level 1 or 2 (except for extended 
formats).
  To play in a certain order, pre x the folder and  le names with the 
3-digit numbers in the order you want to play them.
MPEG Layer-3 audio decoding technology licensed from 
Fraunhofer IIS and Thomson multimedia.
Windows Media, and the Windows 
logo are trademarks, or registered 
trademarks of Microsoft Corporation 
in the United States and/or other 
countries.
WMA is a compression format 
developed by Microsoft Corporation. 
It achieves the same sound quality 
as MP3 with a  le size that is smaller 
than that of MP3.
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ENGLISH English English
Cassette tape
Disc lid
CD OPEN/CLOSE 0 Top of unit
Basic playBasic play
1Press [0] and insert the cassette.
Insert inside the guides Forward side
2Close the lid by hand.
3Press [TAPE 3] to start play.To play the other side of the cassette, turn the cassette over. 
To Action
stop tape playbackPress [ 7 ].
start one-touch play Press [TAPE 3] when the unit is OFF with 
the cassette loaded.
fast-forward and 
rewindPress 
[/REW/4] or [/FF/¢] in the 
stop mode.
Note  Tapes exceeding 100 minutes are thin and can break or get caught 
in the mechanism.
  Endless tapes can get caught up in the deck’s moving parts if used 
incorrectly.
TPS (Tape Program Sensor)TPS (Tape Program Sensor)
This function enables you to search the beginning of a track, 
up to a maximum of 9.
Press 
[/REW/4] or [ /FF/¢] during play.
Play resumes from the track found.
NoteTPS may not function properly:
  with short silent parts
  when noise occurs between tunes
  if silent parts are found within tunes
RecordingRecording
Use normal position tapes.
High position and metal position tapes can be used, but this 
unit will not be able to record or erase them correctly.
Preparation
Wind the leader tape so that recording can begin 
immediately.
Recording the radioRecording the radio
1Insert the cassette to be recorded.
2Tune to the required station (refer to page 10).
3Press [¶ REC/8] to start recording.
Recording discsRecording discs
1Insert the cassette to be recorded.
2Push [CD OPEN/CLOSE 0] to insert the disc and 
close the lid.
3Press [CD 3/8] and then [7, –DEMO].
4Press [PLAY MODE] to select your desired mode 
(refer to page 7).
5Press [¶ REC/8] to start recording.
Recording programmed tracksRecording programmed tracks
1Insert the cassette to be recorded.
2Program the tracks you want (refer to page 8).
3Press [¶ REC/8] to start recording.
Other basic operationsOther basic operations
To Action
erase a recorded 
sound1) Insert the cassette to be recorded.
2) 
Press [TAPE 3] and then [7, –DEMO].3) Press [¶ REC/8].
stop recordingPress [ 7 ].
stop recording 
temporarily1) Press [¶ REC/
8].
2) Press again to resume recording.
record on the other 
side of the tapeTurn the cassette over and press 
[¶ REC/
8].
Erasure preventionErasure prevention
The illustration shows how to remove the tabs to prevent 
recording. To record on the tape again, cover as shown.
Side A
Tab for side A
Tab for side BTo re-record
Normal tape
Adhesive tape
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Radio
Numeric 
buttons
Memory presetMemory preset
Up to 15 stations can be set in both the FM and AM bands.
Preparation
Press [TUNER/BAND] to select “FM” or “AM”.
Automatic presettingAutomatic presetting
Press and hold [PROGRAM] to start presetting.
Manual presettingManual presetting
1Press [PLAY MODE] to select “MANUAL”.
2Press [/REW/4] or [ /FF/¢] to tune to the 
required station.
3Press [PROGRAM].
4Press numeric buttons to select a channel.
The station occupying a channel is erased if another 
station is preset in that channel.
5Repeat steps 2 to 4 to preset more stations.
Selecting a preset stationSelecting a preset station
Press numeric buttons to select the channel.
For channels 10 to 15 press [h10], then the two digits.
OR
1Press [PLAY MODE] to select “PRESET”.
2Press [/REW/4] or [ /FF/¢] to select the 
channel.
FM allocation settingFM allocation setting
By main unit only
This system can also receive FM broadcasts allocated in 
0.1 MHz steps.
To change the step to 0.1 MHz
1Press and hold [TUNER/BAND].
After a few seconds the display changes to a  ashing 
display of the current minimum frequency.
2Continue to hold down [TUNER/BAND].
  When the minimum frequency changes, release the 
button. To return to the original step, repeat the above 
steps.
  After the setting is changed, any previously preset 
frequency will be cleared.
Manual tuningManual tuning
1Press [TUNER/BAND] to select “FM” or “AM”.
2Press [PLAY MODE] to select “MANUAL”.
3Press [/REW/4] or [ /FF/¢] to select the 
frequency of the required station.
“ ST ” is displayed when a stereo FM broadcast is being 
received.
To tune automatically
Press 
[/REW/4] or [/FF/¢] for a moment until the 
frequency starts changing rapidly. The unit begins auto 
tuning, stopping when it  nds a station.
  Auto tuning may not function when there is excessive 
interference.
  To cancel auto tuning, press 
[/REW/4] or [/FF/¢] once again.
To improve FM sound qualityTo improve FM sound quality
Press and hold [PLAY MODE] to display “MONO”.
To cancel
Press and hold [PLAY MODE] again until “MONO” 
disappears.
  MONO is also canceled if the frequency is changed.
  Turn off “MONO” for normal listening.
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