Jensen JCR-425 Clock Radio Logo

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Question about Jensen JCR-425 Clock Radio

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JCR-160 clock radio Clock running slow

Jensen JCR160 digital clock running slow Tried JCR160 with 120v to 220v convertor in India found the clock looses 5 secs for every min. Tried replacing 110volt input transformer with different 230v input transformer found no change. Tried rewinding the primary side of the original transformer without disturbing the secondary winding & the voltage output still no change. Any solution available ?....

Posted by maran Mara on

  • 2 more comments 
  • maran Mara Nov 29, 2007

    Thanks, but do we have any fix for this?- Regards

  • deydat Jan 12, 2008

    I am also facing same problem due to mains 50/60 HZ being used for clock in put frequency.
    Sonashi make digital clock radio does not show proper time. Tried using MM5369 ic with 3.579 mhz crystal but display flickers.

  • Anonymous Jun 13, 2008

    I also face the same problem
    I use MAGNOVOX MCR140/17 clock radio. The product is excellent but the clock runs slow when used in India as the electrical frequency is 50 Hz compared to 60 Hz so I dont know what to do now.

  • Anonymous Mar 19, 2014

    The clock runs but it in running too slow


2 Answers


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There is an option to choose 50 Hz or 60 Hz in main IC. Open the radio clock and see the number of IC. Download datashee of that IC and see for selection of 50/60 Hz. You have to just short the desired pin.
Pl. feel free on any query at [email protected]

Posted on Mar 08, 2009


The clock works off the frequency (hertz). In US the electrical wave frequency is 60HZ/sec and in India and many other countries 50HZ/sec. Hence, the clock slows down about 6 seconds or so every minute.

Posted on Nov 28, 2007

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Instructions for jensen jcr-425 clock radio, how to set clock

To preset a channel on the JCR-425, you tune in the channel; press the "AL/MEM" button on top of the radio (at which time you will probably be switched to some other radio frequency, which is rather disconcerting), press the "Up" or "Down" button to select the desired preset channel number, press "Set" -- and only then are you returned to your desired radio station. If you want to preset several channels,
You might then think that the next time you turn on the radio that all you would have to do is press one of the 10 preset channel buttons on the front of the radio to visit one of your preset radio stations. You would be wrong. You must turn on the radio, then press the "AL/MEM" button on top of the radio. Only then can you access your preset radio stations.
You might also think that to turn on the radio you would press a button that says "Power." Wrong. You press a button that says "Radio." Well, okay. But you might think that to turn it off, you would just press the "Radio" button again. Wrong. If you have pressed the "AL/MEM" button to access your preprogrammed channels, pressing the "Radio" button simply takes you out of the "AL/MEM" function and back to the "FM" (or "AM") function, apparently taking you back to the last radio station you tuned in manually. To turn off the radio after accessing a preset channel, you must press "Radio" twice.

I would like to be able to dim the display for this clock radio. Is there a way?

There is a display button on the unit, if that does not dim the display, there is almost nothing you can do

We had a power failure after a few power surges and now I cannot set the clock. The display keeps blinking rapidly. How can I set the clock?

Jensen Smart Talk JCR 290 User Manual Page 10

In radio off mode, press SET BUTTON (#5) to enter AL1/AL2/Time
setup mode.
1. The HOUR DIGITS and AL1 indicator in the LCD panel will flash.
2. Using the > (UP) (#6) or < (DOWN) (#4) BUTTONS, adjust to the
desired hour for AL1.
3. Press SET BUTTON (#5). The MINUTE DIGITS and AL1 indicator
in the LCD panel will flash (#25).
4. Using the > (UP) (#6) or < (DOWN) (#4) BUTTONS, adjust to the
desired minute for AL1.
AL1 will flash (#25).
6. Use the > (UP) (#6) or < (DOWN) (#4) BUTTONS to choose a
Wakeup Alarm Sound - Ocean, Rain, Brook, Radio or Beep Alarm.
Jensen Smart Talk JCR 290 User Manual Page 9

Hi, i have a dream machine sony ICF-c218 by mistak connected to 220v the original transformer is 120V & i also would like know the output voltage of this transformer so that i can change it 220V p

My self sushil from india pl.find the details
yellow-blue is 3.2 VAC
red-white is 4.2 VAC.
Clock is well functioning without frequencies difference error. I think the clock is using crystal for pulses generator instead of AC power supply frequency.

Just need to know how to set the time and Alarm

the 3rd button on the first row said stop/TIME
it only works as "STOP" when the "FUNCTION" knob is on CD otherwhise is the "TIME" setting button akong with the "MINUTE" & "HOUR" buttons in the same row

Jensen JCR-550 manual

Get it on internet,type and download the manual is free.


i had the same issue; with a little bit of experimenting I was able to set the time. Hold down the stop/time button until it displays 12A (it might display 24H first - do it again if you don't want military time to get the 12A) Let go then press stop/time again so the time blinks. Use the hour and minute buttons to set the time appropriately. When satisfied, press the stop/time button again.
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