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9

OPERATION

Warning:

 

To prevent possible hearing loss, turn 

VOLUME

 to 

MIN

 before you turn on the receiver or change the program 

source. After you turn on the receiver or change the program 
source, adjust 

VOLUME

 to a comfortable listening level.

You can use the supplied remote control by pointing it at the 
receiver’s front panel and pressing the desired button(s). Many 
buttons on the remote control work the same as buttons on the 
receiver’s front panel. Use these buttons exactly as you would 
use the corresponding buttons on the receiver.

Follow these steps to use the receiver.

1. Press 

POWER

 to turn on the receiver. It takes about 5 

seconds to hear sound.

2. Select the speakers. An indicator lights next to the 

A

 and/

or 

B

 to show which speakers are on.

If you connected speakers only to the 

A

 (or 

B

SPEAKERS

 terminals, press 

SPEAKERS A

 (or 

B

) to turn 

on only those speakers. Do not press both 

SPEAKERS A

 

and 

B

 because doing so turns off all speakers even though 

both indicators are on.

If you connected speakers to both the 

A

 and 

B SPEAKERS

 

terminals, you can:

• Press 

SPEAKERS A

 or 

B

 to turn on either pair of speak-

ers for a two-speaker effect.

• Press 

SPEAKERS A

 and 

B

 to turn on both pairs of 

speakers for a four-speaker effect.

Press 

SPEAKERS A

 and/or 

B

 to turn off all speakers so 

you can listen privately with headphones (see “Using 
Headphones” on Page 11).

3. Select a program source.

To tune to a radio station, see “Direct Tuning (Remote 
Control Only)” on Page 10.

To listen to signals from the component connected to the 

TAPE MONITOR

 jacks, press 

TAPE MONITOR

 so 

TAPE

 

MON

 appears.

To listen to a source other than the one connected to the 

TAPE MONITOR

 jacks, press 

TAPE MONITOR

 so 

TAPE

 

MON

 disappears. Then press 

CD

PHONO

, or 

AUX

 (

CD

PHONO

, or 

AUX

 appears).

4. Turn 

VOLUME

 clockwise to increase the volume or 

counterclockwise to decrease it. Or, you can use 

VOLUME 

 and 

 on the remote control.

5. To adjust the tone, turn 

BASS

 and 

TREBLE

 toward 

+

 or 

. To increase the high and low ranges of sound at low 

volume, press 

LOUDNESS

. (To turn off this feature, press 

LOUDNESS

 again.)

6. To adjust the balance of sound between the left and right 

speakers, see “Adjusting Balance” on Page 11.

7. When you finish using the receiver, press 

POWER

 to turn 

it off.

USING THE SLEEP TIMER

The sleep timer lets you set the receiver to play for up to 90 
minutes, then automatically turns off.

1. To set the timer, turn on the receiver then press 

SLEEP

 on 

the remote control. The display dims and shows 

SLEEP

 

90

 

SLEEP

.

2. To set the sleep timer for less than 90 minutes, repeatedly 

press 

SLEEP

 to decrease the time by 10 minutes for each 

press of the button. Once you select the time, the receiver 
displays the program source. (

SLEEP

 stays on the display 

in small letters until automatic shut-off.)

3. To briefly see the time remaining, press 

SLEEP

 once.

TUNING THE RADIO

Your receiver has four types of electronic tuning — manual, 
automatic, direct, and memory.

Note: For weak signals, we recommend manual tuning.

Manual and Automatic Tuning

Follow these steps to manually or automatically tune to the 
stations.

1. Press 

FM

 or 

AM

 on the front panel (or on the remote 

control) to select the desired band. The receiver tunes to 
and displays the frequency last selected in that band.

2. If 

CH

 appears on the right side of the display, press 

MODE

 

to change the receiver to manual-tuning mode. 

MANUAL

 

briefly appears.

3. To manually select the next higher or lower frequency, 

press 

TUNING

 

UP

 or 

DOWN

 once. Or, hold down the 

button to rapidly scan through the frequencies; release the 
button to stop scanning.

To automatically search for the next higher or lower 
station, briefly hold down 

TUNING

 

UP

 or 

DOWN

 to begin 

rapidly scanning through the frequencies. The receiver 
searches up or down the band, stopping on the next strong 
station.

Notes:

TUNED

 appears when the received signal is strong.

STEREO

 appears when the received FM broadcasts are 

in stereo.

Summary of Contents for STA-3850

Page 1: ...owner s manual STA 3850 STEREO RECEIVER ...

Page 2: ...k for extended periods FCC NOTICE This system complies with the limits for a Class B digital device as specified in Part 15 of FCC Rules These limits provide reasonable protection against radio and TV interference in a residential area However your equipment might cause TV or radio interference even when it is operating properly To eliminate interference you can try one or more of the following co...

Page 3: ...ord Power Cord Protection Route power supply cords so they are not likely to be walked on or pinched by items placed on or against them paying particular attention to cords at plugs convenience receptacles and the point where they exit from the product Lightning For added protection for this product during a lightning storm or when it is left unattended and unused for long periods of time unplug i...

Page 4: ...ntrol s Batteries 8 Connecting to AC Power 8 Operation 9 Using the Sleep Timer 9 Tuning the Radio 9 Manual and Automatic Tuning 9 Direct Tuning Remote Control Only 10 Memory Tuning 10 Automatically Storing Stations 10 Manually Storing a Station 10 Tuning to a Station in Memory 10 Adjusting Balance 11 Muting the Receiver 11 Using Headphones 11 Listening Safely 11 Cassette Deck Features 11 Using the...

Page 5: ...and the other pair to the B SPEAKERS terminals Optimus and other high quality speakers have color coded speaker terminals red for positive polarity and black for negative polarity Use these color coded terminals as a guide to help you properly connect the speakers to the receiver Use 16 gauge or larger speaker wire for all speaker connections and consider possible speaker locations before you deci...

Page 6: ...und wire to the receiver s GND screw terminal Connecting a CD Player To connect a CD player to the receiver connect the CD player s left and right output jacks to the receiver s L and R CD IN jacks Connecting a Cassette Deck You can connect a cassette deck to the TAPE MONITOR jacks Connect the cassette deck s output jacks to the PLAY jacks and connect the cassette deck s input jacks to the REC jac...

Page 7: ...se only or an outdoor VHF TV antenna To connect the TV antenna to the receiver you need a VHF UHF FM splitter not included RadioShack stores carry a full line of quality antennas and antenna connection accessories Warning To prevent injury read and follow all cautions and warnings that accompany the outdoor antenna For the best radio reception use an outdoor antenna Follow these steps to connect a...

Page 8: ...he battery compartment cover push the compartment s tab in the direction of the arrow then lift off the cover 2 Place two fresh AA batteries in the compartment as indicated by the polarity symbols and marked inside 3 Replace the battery compartment cover Note If the remote s range is reduced replace the batteries CONNECTING TO AC POWER Warning To prevent electric shock do not use this polarized pl...

Page 9: ...u can use VOLUME and on the remote control 5 To adjust the tone turn BASS and TREBLE toward or To increase the high and low ranges of sound at low volume press LOUDNESS To turn off this feature press LOUDNESS again 6 To adjust the balance of sound between the left and right speakers see Adjusting Balance on Page 11 7 When you finish using the receiver press POWER to turn it off USING THE SLEEP TIM...

Page 10: ...st frequency station in the band Repeat these steps to automatically store stations in the other band Manually Storing a Station When the receiver automatically stores stations some of them might not be your favorites Or the 30 channel memory might have filled up before the receiver reached your favorite station at the high end of the frequency range Follow these steps to manually replace a statio...

Page 11: ...the volume level so a volume level that does not cause discomfort might still damage your hearing CASSETTE DECK FEATURES You can connect a cassette deck to the receiver Selecting TAPE MONITOR lets you hear the playback from the cassette deck you connected to the receiver s TAPE MONITOR jacks Using the Tape Monitor Button Press TAPE MONITOR TAPE MON appears along with the last program source you se...

Page 12: ...ne of the speaker wires or the input cord is disconnected Check all connections BALANCE is set too far to one side Set BALANCE to the center position High noise level Station not correctly tuned Adjust tuning Antenna not connected Connect the antenna FM antenna still coiled or is not pointing in the correct direction Stretch both ends of the antenna taut and reposition the antenna AM loop antenna ...

Page 13: ...hack and is covered by a limited warranty from RadioShack If your receiver is not operating as it should take it to your local RadioShack store or call 1 800 THE SHACK for assistance THE FCC WANTS YOU TO KNOW Your receiver might cause radio or TV interference even when it is operating properly To determine whether your receiver is causing the interference turn off your receiver If the interference...

Page 14: ...B FM Tuner Frequency Range 87 5 to 108 MHz Usable Sensitivity Mono 15 µV m EMF Signal to Noise Ratio Mono 68 dB Stereo 63 dB Distortion Stereo 0 5 1 kHz Alternate Channel Selectivity 45 dB 400 kHz Stereo Separation 35 dB 1 kHz AM Tuner Frequency Range 530 to 1720 kHz Sensitivity IHF Loop Antenna 500 µV m Selectivity 25 dB Signal to Noise Ratio 35 dB General Power Requirements 120 Volts AC 60 Hz Po...

Page 15: ...15 NOTES ...

Page 16: ...nt of a product defect during the warranty period take the product and the RadioShack sales receipt as proof of purchase date to any RadioShack store RadioShack will at its option un less otherwise provided by law a correct the defect by product repair without charge for parts and labor b replace the product with one of the same or similar design or c refund the purchase price All replaced parts a...

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