Question about Sharper Image (SI721WHT) Clock Radio

1 Answer

Power cord not working

Had this unit for years and it just stopped working with the power cord one day last week. Even though the female end of the cord snaps into the internal slot cleanly, it does not appear to be making or holding a solid connection. I'm thinking the internal prong that the plug envelops is out of alignment. Device seems to work with batteries, but I don't want to have to rely on them. Any ideas?

Posted by on

  • SharperImage Sep 04, 2008

    Thanks for your help.

    It is a detachable AC cord that plugs into the wall and into a recessed "male" prong on the side of the radio. It also is a small box at the end that plugs into the wall and is described as "Class 2 Transformer" with Output: 6V DC 1000mA. I thought it was not connecting cleanly with the internal prong, but you are suggesting the power supply in the cord may have died. Can I just take any other 6V DC 1000mA power supply and replace it? I popped into a Radio Shack, but I guess the key term was "friendly" since they were not interested in assisting me.


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 5,568 Answers

When you say 'power cord,' do you mean a detachable AC cord or is there an external power supply that plugs into and outlet?
Those are two different animals and if the receptacle end that plugs into the wall is a small box, you cannot replace it with a simple 2-wire cord as the small box is actually a primitive power supply.
If so, there should be rating printed on the flat side that faces the wall and will have something like '12VDC 200 mA'

If so, it has probably died.
Most connectors don't fail unless they are frequently plugged and unplugged as they are for camera chargers for example.

If you bring the modular supply to any electronics store, they will surely have a meter to see if anything is coming from the supply.
Alternately, you could buy a cheap digital multimeter and check it yourself.

There is a huge variety of universal 'wall warts' that will take the place of a dead one but you must be cautious about polarizing the supply output with the provided means; often simply plugging the wall end of the output cable in one way or the other.
If you incorreclty polarize the the clock end, you may damage the clock radio forever.

If you have a friendly Radio Shack store in your area, I would just bring both clock radio and its supply to them and ask them to check the supply and sell you the right one as a replacement if defective.

You may be able

Posted on Sep 03, 2008

  • Steve Allison
    Steve Allison Sep 04, 2008

    If you know anyone who does anything electrical, they will have a multimeter that will tell you if the supply is putting out anything at all. These have no load regulation and the output voltage of one rated at 6 VDC/1 amp could easily read 9-10 volts with only the meter on it.

    It may not be defective at all.

    The problem with mail orders on this is the polarity (if it has no provisions for changing it) and the physical dimensions of the plug.

    There are about two dozen unnecessary variations on two-pole plugs for what reason, I cannot fathom.

    Maybe 6-8 of them look very similar but vary in shell and male or female inner conductor by sometimes tenths of a mm.

    Sorry about your experience with RS although I admit to having had 'tongue in cheek' when I wrote that.

    The current rating is kind of high; 6 volts is one of the more common voltage ratings but the 1000mA (1 amp) current is 2-5 times higher than the average.

    To give you an idea of the range of outputs and prices, take look at this link to a surplus supplier:

    I haven't looked but considering Sharper Image is in bankruptcy, you may not get any help from them. They might have been able to supply exactly the one you now have.

    I don't know your area but a few telephone calls to stores listed in the Electronic Equipment section of your phone book (or check on line) should yield more than one place to buy this.

    They will mark them up horribly; I once kept some 'universal' supplies on hand as a convenience for customers that could be changed from 1.5 to 12 volts in steps, a current rating of 1 amp., and had polarity reversal as well as a cord that had 3-5 different common connectors and never paid in excess of $1.50 US.

    Expect to pay $5-$15 US.


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Wrong day of week showing even though correct date?

Suggest reading the manual again as we see no make listed we can offer nothing .

Nov 15, 2015 | Audio Players & Recorders

1 Answer

My radio stopped working after a power surge tripped the breaker for the outlet it was plugged into.

I have had several different makes of clock radios and all said that it was battery back up for power failure
none worked and all settings had to be redone
power surges do not trip breakers as they are in effect a fuse to prevent damage to the wiring in a dead short situation or when a unit fails
even surge protectors will still pass power after a surge but will no longer protect against another surge

Sep 04, 2015 | Emerson CKS3528 SmartSet Desktop Clock...

1 Answer

Antena for bose radio?

The Bose uses its power cord as an FM antenna. Make sure it's reasonably stretched out (not coiled), and is not in surroundings that shield it from the outside (a steel frame building, though even here putting it close to a window can give you reception). If this isn't enough to get stations clearly, there is a jack on the back of the radio where you can plug in a dipole (piece of wire) antenna available from Bose -- not cheap for what it is -- an indoor antenna from Radio Shack or a similar store, or even a roof-mounted unit. If you don't buy from Bose, you'll need an adapter to convert from the standard plug everyone else uses to the phone jack Bose has decided to use instead. Radio Shack sells one: catalog 278-257.

Jul 13, 2014 | Bose Wave Radio

1 Answer

After a power outage of approximately 45 minutes i have no display

There is a Lithium battery inside your clock to get a backup even the power is interrupted for a long time. This battery may last up to 3 years eventhough there is no power to the device. If this has gone weak, the backup fucntion will not be. so check this battery.
Just reset the device. It will make it work properly. To reset the clock after total memory loss; do the folloing.

[1] Connect the radio to your AC outlet and let the clock set itself.

[2] Depress the MONTH/DATE and TIME buttons together. The display will change
from 'Time'to 'Year'

While holding the MONTH/DATE and TIME buttons, press the SET + button
to set the display to the correct Year, then release the buttons

Jul 24, 2011 | Emerson Smartset Clock Radio

1 Answer

The alarm display in the lower right corner on model #RC40-A keeps blinking and will not stop. This happens with both wake 1 and wake 2 options. I fixed it once by unplugging the unit but it this did not...

Just reinstall the battries and adjust the time once again.

Battery back-up operation

* This clock radio is equipped with

a memory holding system that can

be powered with 2 "AA" batteries

(included). The power failure

protection circuit will not operate

unless battery is installed.

* When normal household power

is interrupted, or AC line cord

is unplugged, the batteries will

power the clock radio to keep

track of time and alarm settings

programmed into memory.

* When the battery backup functions,

the digital display will not light,

however, the function of alarm

still occurs during the power

interruption if remaining battery

power is adequate.

* Normal operation will resume after

AC power is restored so you will not
have to reset the time or the alarm

To install batteries:

1* Remove battery compartment door

(located at the bottom of the radio)

by applying thumb pressure to the

tab on battery door and then lift
the door out and off the cabinet

2* Insert 2 AA batteries (included).
3* Replace the compartment door

Replace batteries every year.

Power is fed to the unit even

when it is not functioning. To

cut the power supply off, the
power cable must be unplugged

Jul 10, 2011 | RCA Rc40 Clock Radio

1 Answer

We used a differed sized power cord and it stopped working is it fixable?

It wouldn't hurt anything to try to use the original power cord. Its possible that the other cord just wasnt making a good contact.

Jan 03, 2011 | Homedics SS-4000 Clock Radio

1 Answer

Will not power on, makes static noise just as you

First off how long have you owned the unit? Bose has pretty good manufacturer warranties. Usually several years up to 5 or 10 sometimes. Once I have more information I will assist you further. It sounds like either the amp or something else may be defective inside the unit.

Jul 11, 2009 | Audio Players & Recorders

1 Answer

Can a Bose radio get fixed after a power surge?


Feb 20, 2009 | Bose Wave Radio

3 Answers

Wrong date on the radio.


If you do not change the built in lithium battery within a reasonable period of time after you see the ‘flashing’ LOW BATT. warning indicator, the lithium battery may become exhausted and will no longer be able to supply back up power to the SmartSet internal computer.

If the unit is disconnected from the AC outlet after the battery is exhausted, or if a power interruption occurs, the SmartSet memory will be lost and the clock will need to be reset when the power is restored. Be sure to install a fresh lithium battery before you reset the clock, otherwise the clock will need to be reset each time the power is interrupted.

If the lithium battery is exhausted and you experience an interruption in the AC power supply, the clock will reset itself to its initial default setting when the power is restored.

The initial default setting is “12:00 AM, Saturday, January 1
(1 1), 2005”.

If you notice that the time on your SmartSet clock radio is completely incorrect, and the day indicator is also wrong, press the MONTH/DATE button to see the date. If the date display is showing “1 1” (January 1 ), you probably experienced
a total memory loss. To reset the clock after a total memory loss, proceed as follows:

1.) Install a new CR2430 lithium battery in the battery compartment.

2.) Connect the radio to your AC outlet and let the clock set itself.

3.) Depress the MONTH/DATE and TIME buttons together. The display will change from ‘time’ to ‘year’. While holding the MONTH/DATE and TIME buttons, press the UP button to
set the display to the correct year, then release the buttons.

4.) Depress the MONTH/DATE button. The display will change from ‘time’ to 'month/date’ (mm/dd). While holding the MONTH/DATE button, press the UP button to set the display
to the correct month and date. The Day indicator will change automatically as you adjust the month/date settings. When the correct month and date appear on the display, release the buttons.

5.) Depress the TIME button and the UP button to set the display to the correct time. Be sure to confirm that you have set the time correctly to ‘AM’ or ‘PM’ by observing the AM indicator.

6.) After you set the time, reconfirm that the Day, and Month/Date displays are still correct. Make final adjustments if necessary.

The SmartSet clock memory is now reset and the new lithium battery will maintain it for the next 5 to 8 years, depending on the number and duration of the power outages you experience.

After resetting the clock, don’t forget to reset your wake up times, and alarm mode settings, and sleep timer settings as well.

Oct 22, 2007 | Emerson SmartSet CKS1850 Clock Radio

1 Answer

I get no sound at all

Make sure put volume on it unmute the sound. Possiblities: 1. You have a blown speakers 2. You have a power problem going into your unit. The clock display power is separated on that unit so its seem ok. You need to check the fuse and the continuity of the cord, but todo so u need to open that unit to access the module. Hope this may help you. pls rate me.

Aug 13, 2007 | Panasonic RC-CD350 Clock Radio

Not finding what you are looking for?
Sharper Image (SI721WHT) Clock Radio Logo

146 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sharper Image Audio Players & Recorders Experts

The Knight
The Knight

Level 3 Expert

71186 Answers

Tom Chichester

Level 3 Expert

28096 Answers


Level 3 Expert

3018 Answers

Are you a Sharper Image Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides