Sherwood Stereo System RX 4105 User Manual

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RX-4105  
AM/FM STEREO RECEIVER  
 
Introduction  
UNPACKING AND INSTALLATION  
Congratulations on Your Purchase!  
FOR U.S.A.  
Your new high fidelity receiver is designed to deliver  
maximum enjoyment and years of trouble free service.  
Please take a few moments to read this manual  
thoroughly. It will explain the features and operation of  
your unit and help ensure a trouble free installation.  
Please unpack your unit carefully. We recommend that  
you save the carton and packing material. They will be  
helpful if you ever need to move your unit and may be  
required if you ever need to return it for service. Your unit  
is designed to be placed in a horizontal position and it is  
important to allow at least two inches of space behind  
your unit for adequate ventilation and cabling  
Note to CATV System Installer: This reminder is  
provided to call the CATV system installer's attention  
to Article 820-40 of the NEC that provides guidelines  
for proper grounding and, in particular, specifies that  
the cable ground shall be connected to the  
grounding system of the building, as close to the  
point of cable entry as practical.  
FCC INFORMATION  
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:  
convenience.  
To avoid damage, never place the unit near radiators, in  
front of heating vents, in direct sunlight, or in excessively  
humid or dusty locations. Connect your complementary  
components as illustrated in the following section.  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
CAUTION : TO REDUCE THE RISK OF  
ELECTRIC SHOCK, DO NOT  
REMOVE COVER (OR BACK).  
NO USER-SERVICEABLE PARTS  
INSIDE. REFER SERVICING TO  
QUALIFIED SERVICE PERSONNEL.  
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.  
This symbol 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.  
Consult the dealer or an experienced radio/TV  
technician for help.  
CAUTION: Any changes or modifications in  
construction of this device which are not expressly  
approved by the party responsible for compliance  
could void the user's authority to operate the  
equipment.  
This symbol is intended to alert the user to the  
presence of important operating and  
maintenance (servicing) instructions in the  
literature accompanying the appliance.  
WARNING  
Caution regarding placement  
(Except for U.S.A. and Canada)  
To reduce the risk of fire or electric shock, do not expose  
this appliance to rain or moisture.  
To maintain proper ventilation, be sure  
to leave a space around the unit (from  
the largest outer dimensions including projections)  
equal to, or greater than, shown below.  
Caution : Do not block ventilation openings or stack  
other equipment on the top.  
Left and right panels: 5 cm  
Rear panel: 10 cm  
Top panel: 20 cm  
2
 
READ THIS BEFORE OPERATING YOUR UNIT  
FOR U.S.A AND CANADA .................................. 120 V  
FOR OTHER COUNTRIES ........................ 115 V/230 V  
FOR YOUR SAFETY  
FOR YOUR SAFETY  
Units shipped to the U.S.A and Canada are designed  
for operation on 120 V AC only.  
Units shipped to countries other than the above  
countries are equipped with an AC voltage selector  
switch on the rear panel. Refer to the following  
paragraph for the proper setting of this switch.  
Safety precaution with use of a polarized AC plug.  
However, some products may be supplied with a  
nonpolarized plug.  
AC VOLTAGE SELECTION  
This unit operates on 115/230 V AC. The AC voltage  
selector switch on the rear panel is set to the voltage  
that prevails in the area to which the unit is shipped.  
Before connecting the power cord to your AC outlet,  
make sure that the setting position of this switch  
matches your line voltage. If not, it must be set to  
your voltage in accordance with the following  
direction.  
CAUTION : To prevent electric shock, match wide  
blade of plug to wide slot, fully insert.  
FOR CHINA, EUROPE AND AUSTRALIA ........ 220V/230V/240V  
FOR YOUR SAFETY  
Units shipped to China are designed for operation on  
220 V AC only.  
AC voltage selector switch  
Units shipped to Australia are designed for operation  
on 240 V AC only.  
To ensure safe operation, the three-pin plug supplied  
must be inserted only into a standard three-pin  
power point which is effectively earthed through the  
normal household wiring. Extension cords used with  
the equipment must be three-core and be correctly  
wired to provide connection to earth.  
Improper extension cords are a major cause of  
fatalities. The fact that the equipment operates  
satisfactorily does not imply that the power point is  
earthed and that the installation is completely safe.  
For your safety, if in any doubt about the effective  
earthing of the power point, consult a qualified  
electrician.  
Move switch lever to match your line voltage with a  
small screwdriver or other pointed tool.  
PAN-EUROPEAN UNIFIED VOLTAGE  
All units are suitable for use on supplies 230-240 V  
AC.  
3
 
CONTENTS  
SAFETY INSTRUCTIONS ............................................................................................................ 1  
Introduction  
UNPACKING AND INSTALLATION............................................................................................. 2  
READ THIS BEFORE OPERATING YOUR UNIT ....................................................................... 3  
System Connections .................................................................................................................... 5  
Front Panel & Remote Controls ................................................................................................ 7  
REMOTE CONTROL OPERATION RANGE .............................................................................. 9  
LOADING BATTERIES ............................................................................................................... 9  
Operations  
LISTENING TO A PROGRAM SOURCE .................................................................................. 10  
LISTENING TO RADIO BROADCASTS ................................................................................... 12  
RECORDING ............................................................................................................................ 14  
OTHER FUNCTIONS ................................................................................................................ 14  
Troubleshooting Guide ............................................................................................................. 15  
Specifications .............................................................................................................................. 16  
4
 
System Connections  
• Do not plug the AC input cord into the wall AC outlet until all connections are completed.  
• Be sure to connect the white RCA pin cords to the L(left) and the red RCA pin cords to the R(right) jacks when  
making audio connections.  
• Change the position of the FM indoor antenna until you get the best reception of your favorite FM stations.  
• A 75 outdoor FM antenna may be used to further improve the reception.  
Disconnect the indoor antenna before replacing it with the outdoor one.  
• Place the AM loop antenna as far as possible from the receiver, TV set, speaker cords and the AC input cord and  
set it to a direction for the best reception.  
• If the reception is poor with the AM loop antenna, an AM outdoor antenna can be used in place of the AM loop  
antenna.  
• Make connections firmly and correctly. If not, it can cause loss of sound, noise or damage to the receiver.  
• If the electricity fails or the AC input cord is left unplugged for more than several days, the memorized contents will  
be cleared. Should this happen, memorize them again.  
5
 
6
 
Front Panel & Remote Controls  
7
 
POWER BUTTON  
NUMERIC BUTTONS(0 ~ 9)  
Press these buttons to select or to store preset  
stations directly.  
Each time the POWER button is pressed, this unit is  
turned on to enter the operating mode or off to enter  
the standby mode.  
TUNING/PRESET UP/DOWN(  
Press these buttons to tune in the desired stations.  
BUTTONS  
STANDBY INDICATOR  
HEADPHONE JACK  
Stereo headphones with a standard 1/4 inch plug  
can be plugged into this jack for private listening.  
FM MODE BUTTON  
Press this button to select the desired FM mode.  
Each time this button is pressed, the FM mode is  
changed to the stereo mode or the mono mode.  
SPEAKER A, B SELECTOR BUTTONS  
These buttons allow you to select various  
combinations of speakers as follows:  
To drive A speakers, press only the SPEAKER A  
button (“SPK A” is displayed).  
PRESET SCAN BUTTON  
Press this button to scan the stations in the preset  
sequence.  
To drive B speakers, press only the SPEAKER B  
button (“SPK B” is displayed).  
VOLUME CONTROL KNOB, UP/DOWN(  
BUTTONS  
Adjust the volume to a comfortable listening level  
)
To drive both A and B speakers, press the  
SPEAKER A(or B) and B(or A) buttons in  
order.(“SPK A B” is displayed).  
with this knob or these buttons.  
When using headphones for private listening,  
press these buttons in order to switch off the  
speaker A and B (“SPK OFF” is displayed).  
MUTE BUTTON  
Press this button to temporarily mute the sound.  
Press again to resume the previous sound level.  
INPUT SELECTOR BUTTONS  
Press the button to select the desired input source.  
DIMMER BUTTON  
Press this button to select the brightness of the  
fluorescent display as desired.  
Each time this button is pressed, the brightness  
of the fluorescent display changes together as  
follows:  
TONE BUTTON  
When adjusting the tone (bass and treble), press  
this button to select the desired tone mode.  
Each time this button is pressed, the tone mode  
is changed to bass or treble.  
SLEEP BUTTON  
Press this button to activate the sleep timer for a  
specified period of time.  
BALANCE BUTTON  
When adjusting the sound volume balance, press  
this button to enter the balance mode.  
Each time this button is pressed, the sleep time  
changes as follows:  
BALANCE, TREBLE/BASS UP/DOWN  
(
) BUTTONS  
At the balance mode, adjust the sound volume  
balance between left and right speakers with  
these buttons.  
REMOTE SENSOR  
This receives the signals from the remote control  
unit.  
At the desired tone mode, adjust the tone as  
desired with these buttons.  
FLUORESCENT DISPLAY  
For details, see the next page.  
TONE DIRECT BUTTON  
Press this button to listen to a program source  
without the tone effect.  
MEMORY BUTTON  
Press this button to store preset stations.  
TUNING/PRESET MODE BUTTON  
Press this button to select the tuning mode or the  
preset mode.  
8
 
FLUORESCENT DISPLAY  
LOADING BATTERIES  
REMOTE CONTROL OPERATION RANGE  
Remove the cover.  
1
Load two batteries matching the  
polarity.  
2
Use the remote control unit within a range of  
about 7 meters (23 feet) and angles of up to 30  
degrees aiming at the remote sensor.  
Remove the batteries when they are not used for a  
long time.  
Do not use the rechargeable batteries(Ni-Cd type).  
9
 
Operations  
LISTENING TO A PROGRAM SOURCE  
Switch the desired speakers on.  
Turn the power on.  
2
1
Each time this button is pressed, this unit is turned  
on to enter the operating mode or off to enter the  
standby mode.  
In the standby mode, the STANDBY indicator lights  
up. This means that the receiver is not  
Then the corresponding speaker  
disconnected from the AC mains and a small  
amount of current is retained to support the  
memorized contents and operation readiness.  
In the standby mode, if an INPUT SELECTOR  
button is pressed, the unit is turned on  
indication(“SPK A(or/and) B”) is displayed and  
the sound can be heard from the speakers  
connected to the selected speaker terminals.  
When using the headphones for private  
listening, press the corresponding SPEAKER  
button to switch off both A and B speakers.  
automatically and the desired input is selected.  
Select the desired input source.  
Operate the selected component for  
playback.  
3
4
Adjust the volume to a comfortable  
listening level.  
5
Each time the FM/AM button on the front panel  
or the TUNER button on the remote control is  
pressed, the band is changed to AM or FM.  
To mute the sound.  
To listen with the headphones.  
6
7
“MUTE” lights up and flickers.  
To resume the previous sound level, press this  
button again.  
Be sure to switch off both A and B speakers.  
10  
 
At the desired tone mode, adjust the  
tone as desired.  
Adjusting the tone(bass and treble)  
9
Enter the tone mode.  
8
Each time this button is pressed, the  
corresponding tone mode is selected and  
shown for 3 seconds as follows:  
If the tone display disappears, start from the  
step 8 again.  
Notes:  
Extreme settings at high volume may damage  
your speakers.  
In general, the bass and treble levels are  
adjusted to 0.  
Note:  
When the tone direct function is activated, the  
tone mode cannot be entered and “TON DIR”  
flickers for 3 seconds.  
To listen to a program source without the tone  
effect.  
10  
“TON DIR” is displayed and the sound that  
bypasses the tone circuitry will be heard.  
To cancel the tone direct function, press this  
button again to display “TON CTRL”.  
Adjust the sound volume balance  
between the left and right speakers.  
12  
Adjusting the sound volume balance  
Enter the balance mode.  
11  
“BAL” and the balance level is displayed for 3  
seconds.  
If the balance display disappears, start from  
the step 11 again.  
Note:  
In general, the balance level is set to 0.  
11  
 
LISTENING TO RADIO BROADCASTS  
Auto tuning  
Select the tuner and then the desired  
band.  
1
• Each time this button is pressed, the band is  
changed to FM or AM.  
Press the TUNING/PRESET UP(  
or DOWN( ) button for more than  
0.5 second.  
)
Select the tuning mode.  
3
2
• Each time this button is pressed, the mode  
changes as follows:  
• The tuner will now search until a station of  
sufficient strength has been found. The display  
shows the tuned frequency and “TUNED”.  
• If the station found is not the desired one,  
simply repeat this operation.  
• Weak stations are skipped during auto tuning.  
Manual tuning  
• Manual tuning is useful when you already know the  
frequency of the desired station.  
• Perform the steps 1 and 2 in “Auto tuning” procedure  
and press the TUNING/PRESET UP( ) or  
DOWN( ) button repeatedly until the right frequency  
has been reached.  
Press the MEMORY button.  
Presetting radio stations  
2
• You can store up to 30 preferred stations in the  
memory.  
Tune in the desired station with auto or  
manual tuning.  
1
• “MEMO” is flickering for 5 seconds.  
12  
 
Repeat the above steps 1 to 3 to  
memorize other stations.  
Select the desired preset number (1~30)  
and press the MEMORY button.  
4
3
MEMORY BACKUP FUNCTION  
The following items, set before the receiver is turned  
off, are memorized.  
• INPUT SELECTOR settings  
• When using the NUMERIC buttons on the remote  
control.  
Examples) For “3” :  
• Preset stations,etc.  
For “15” :  
Note  
For “30” :  
• If the electricity fails or the AC input cord is  
disconnected for more than several days, they are  
all cleared. So you should memorize them again.  
• The station has now been stored in the memory.  
• When using the NUMERIC buttons, the station is  
stored automatically without pressing the MEMORY  
button.  
• A stored frequency is erased from the memory by  
storing another frequency in its place.  
• If “MEMO” goes off, start again from the above step 2.  
Select the desired preset number.  
Tuning to preset stations  
2
After selecting the tuner as an input  
source, select the preset mode.  
1
• When using the NUMERIC buttons on the remote  
control.  
Examples) For “3” :  
For “15” :  
For “30” :  
• Then “PRESET” lights up.  
• When selecting the desired preset number with the  
NUMERIC buttons, the desired preset station will be  
tuned to automatically without selecting the preset  
mode.  
Scanning preset stations in sequence  
Listening to FM stereo broadcasts  
• While listening to FM broadcasts,  
• Each time this button is pressed,  
the FM mode changes as follows:  
• The receiver will start scanning the stations in the  
preset sequence.  
• When FM stereo broadcasts are poor because of  
weak broadcast signals, select the FM mono mode  
to reduce the noise, then FM broadcasts are  
reproduced in monaural sound.  
• At the desired station, press this button again to stop  
scanning.  
13  
 
RECORDING  
The volume, tone(bass, treble) and balance settings have no effect on the recording signals.  
When you select tuner, CD or TV/AUX as a recording source, recording may be made on TAPE or VCR, or both  
simultaneously.  
Recording with TAPE  
Recording with VCR  
Select the desired input as a recording  
source except for TAPE.  
Select the desired input as a recording  
source except for VCR.  
1
1
Start recording on the TAPE.  
Start play on the desired input.  
Start recording on the VCR.  
2
3
2
3
Start play on the desired input.  
The audio signals from the desired input will  
be recorded onto the VCR.  
OTHER FUNCTIONS  
Operating the sleep timer  
Adjusting the brightness of the  
fluorescent display  
The sleep timer allows the  
system to continue to operate  
for a specified period of time  
before automatically shutting  
off.  
To set the receiver to  
automatically turn off after  
the specified period of time.  
Each time this button is pressed, the sleep time  
changes as follows:  
Each time this button is pressed, the  
brightness of the fluorescent display changes  
together as follows:  
While operating the sleep timer, “SLEEP” lights  
up.  
In the display OFF mode, pressing any button  
will restore the display ON mode.  
When the sleep time is selected, the fluorescent  
display is dimly lit.  
14  
 
Troubleshooting Guide  
If a fault occurs, run through the table below before taking your receiver for repair.  
If the fault persists, attempt to solve it by switching the receiver off and on again. If this fails to resolve the situation,  
consult with your dealer. Under no circumstances should you repair the receiver yourself as this could invalidate  
the warranty.  
PROBLEM  
POSSIBLE CAUSE  
REMEDY  
• Connect the cord securely.  
• Check the outlet using a lamp or another  
appliance.  
No power  
• The AC input cord is disconnected.  
• Poor connection at AC wall outlet or the  
outlet is inactive.  
• Check the speaker connections.  
• Adjust the volume.  
No sound  
• The speaker cords are disconnected.  
• The volume is adjusted too low.  
• The MUTE button on the remote control is  
pressed to ON.  
• Press the MUTE button to cancel the  
muting effect.  
• Press the SPEAKER A or B button to ON.  
• Select the desired input source correctly.  
• Make connections correctly.  
• Speakers are not switched on.  
• Incorrect selection of the input source.  
• Incorrect connections between the  
components.  
• Connect an antenna.  
Stations cannot be  
received  
• No antenna is connected.  
• The desired station frequency is not tuned  
in.  
• Tune in the desired station frequency.  
• Move the antenna and retry tuning.  
• Memorize the correct station frequency.  
• Memorize the stations again.  
• The antenna is in wrong position.  
Preset stations cannot be  
received  
• An incorrect station frequency has been  
memorized.  
• The memorized stations are cleared.  
• Connect an antenna.  
Poor FM reception  
• No antenna is connected.  
• The antenna is not positioned for the best  
reception.  
• Change the position of the antenna.  
Change the position of the antenna.  
Install an outdoor antenna.  
Continuous hissing noise  
during FM reception,  
• Weak signals.  
especially when a stereo  
broadcast is received.  
• Keep the receiver away from noise  
sources.  
Continuous or intermittent  
hissing noise during AM  
reception, especially at  
night.  
• Noise is caused by motors, fluorescent  
lamps or lightning, etc.  
• Install an outdoor AM antenna.  
• Make connections correctly.  
No recording  
• Incorrect selection between the  
components.  
• Operate each component correctly.  
• Incorrect operation of each component for  
playback and recording.  
• Replace the batteries.  
• Remove the obstacle.  
Remote control unit does  
not operate.  
• Batteries are not loaded or exhausted.  
• The remote sensor is obstructed.  
15  
 
Specifications  
AMPLIFIER SECTION  
Power output, stereo mode, 8 , THD 0.08 %, 40 Hz~20 kHz ............................................................... 2X105 W  
Total harmonic distortion, 8 , 100 W, 20 Hz~20 kHz ............................................................................. 0.04 %  
Intermodulation distortion  
60 Hz : 7 kHz= 4 : 1 SMPTE, 8 , 100 W .................................................................................................... 0.1 %  
Input sensitivity, 47 kΩ  
Line ........................................................................................................................................................... 200 mV  
Signal to noise ratio, IHF “A” weighted  
Line .............................................................................................................................................................. 95 dB  
Frequency response  
Line, 10 Hz~100 kHz ................................................................................................................................. 3 dB  
Output level  
TAPE/VCR OUT, 2.2 k........................................................................................................................... 200 mV  
Bass/Treble control, 100 Hz/10 kHz ......................................................................................................... 10 dB  
FM TUNER SECTION  
Tuning frequency range ................................................................................................................. 87.5~108 MHz  
Usable sensitivity, THD 3%, S/N 30 dB ...................................................................................................... 15 dBf  
50 dB quieting sensitivity, mono/stereo ............................................................................................ 25.2/45.2 dBf  
Signal to noise ratio, 65 dBf, mono/stereo .............................................................................................. 68/65 dB  
Total harmonic distortion, 65 dBf, 1 kHz, mono/stereo ........................................................................... 0.5/0.8%  
Frequency response, 25 Hz~14 kHz .......................................................................................................... 3 dB  
Stereo separation, 1 kHz .............................................................................................................................. 35 dB  
Capture ratio .................................................................................................................................................. 4 dB  
IF rejection ratio ........................................................................................................................................... 80 dB  
AM TUNER SECTION  
Tuning frequency range ................................................................................................................. 520~1710 kHz  
Usable sensitivity ..................................................................................................................................... 800 V/m  
Signal to noise ratio ...................................................................................................................................... 40 dB  
Selectivity ..................................................................................................................................................... 25 dB  
GENERAL  
Power supply ................................................................................................................................... 120 V~ 60 Hz  
Power consumption ........................................................................................................................................ 2.5A  
Dimensions (W  
H
D) ........................................................... 440 138 332 mm(17-3/8 5-7/16 13 inches)  
Weight (Net) ................................................................................................................................ 9.0 kg(19.85 lbs)  
Note: Design and specifications are subject to change without notice for improvements.  
16  
 
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RX-4105  
AM/FM STEREO RECEIVER  
5707-04740-004-1  
 

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