Clock runs fast. Usually gains 10 minutes in 1 hour. I can't use the clock radio if it does not keep accurate time.

well without the make and model number I can only answer generally , most clock radios use the power line to sync the time base (60 hertz=60 seconds = 1 minute=60 minutes=1 hour) , but they use a internal time base generator when running on battery back-up (that's not so accurate) , I had one some time back that a customer plugged into a switched outlet (unknown to them) in there room and it did exactly the same thing it gained about seven minutes every day , me id check the outlet its plugged into to see if its on all the time (a quick test 4 this is to remove battery back up ) clock will then flash to be reset if you come back later to see it when the power was shut off

If your cuckoo runs too fast or slow, the best way to correct this problem is to set your cuckoo to an accurate watch or clock. After 24 hours, record how many minutes your cuckoo is running too fast or slow. Then adjust the bob up or down the pendulum stick to change the pendulms effective length. You'll need to take an educated guess as to the distance. Reset the cuckoo minute hand time to your watch or clock again. Repeat this process every 24 hours, recording the results, and readjusting the bob until you are within 3 minutes of the correct time. Then, switch from recording every day to recording every week. Use the same process described, recording the time difference, adjusting the bob up or down every week, until the cuckoo is accurate within approximately 3 minutes per week. Remember, mechanical cuckoo clocks are not as accurate as quartz or electric clocks! A three minute error per week is not bad. Maybe you can do better. What you are attempting to do is to obtain is the best timekeeping possible from your cuckoo clock. Afterwards, you will still need to sychronize the cuckoo (coo coo) clock minute hand to an accurate clock or watch, each week or as desired.

There are basically three types of electronic clock.
Quite old-fashioned are those that use the frequency of the mains electricity it is plugged into as a means of approximately keeping time. For practical purposes this type is more accurate than most mechanical types but may lose or gain a little and need adjusting from time-to-time.
If this type becomes unreliable there is nothing the user can do about it and an engineer would be needed or perhaps the garbage or recycling would be a better place.

The second type is the now very common quartz type where the clock circuitry keeps time by being triggered by a very accurate quartz crystal oscillator.
These types are generally so accurate it is worth providing battery back-up in case of power failure as well as preserving alarm and reminder settings.
If this type becomes inaccurate it indicates a problem with the circuitry and again recycling is probably the most practical option, though accumulated damp and dust inside can affect the delicate circuitry which might be restored to accuracy after a thorough internal clean.
I once had similar trouble with my clock radio which was caused in this instance by me forgetting how to operate it correctly. Spending a half-hour playing around with it refreshed my memory so in future I will remember when I have set the alarm to return the display to the clock.

The third type of clock is the radio controlled type that is set and keeps time by receiving a radio signal from a national atomic clock. They can do strange or unusual things if the signal is not being received properly or the clock is faulty but there is usually a function for setting the time manually though in my limited experience these aren't clocks for everyone and they aren't suitable for every location.
Good luck!

Hold the 'Clock' button until the display flashes. It will first show the year, next press on 'Clock' with show the month, then the day, then the time. Use + and - to set your time and press 'Clock' again.

Don't expect this clock to set the time by itself. It is not an atomic clock.

alarm clocks works on frequency and not only on voltage.if it is original 110v 60htz and you trying with 220v 50htz supply then it wont work correctly

This is a problem with either the a/c power or the Clock/Radio's internal timing crystal circuitry. The radio depends on the 60 cycle power source as the timing device. If this power is irregular or uneven in its delivery it can cause the timing circuits to lose or gain time. The Clock/Radio has a frequency tuned crystal that operates like the second hand on a clock. When the calibration for whatever reason is lost the crystal will not be able to perform the timing function correctly. The reason this does not happen in all Clock/Radios is that they usually have correction circuits. These circuits keep the crystal from drifting out of calibration during operation. Because of the low production cost of these Clock/Radios, the quality control is almost non existent. The components are variable and sometimes they do not stay within specifications. This problem is usually handled by quality control departments in the manufacturers facilities. They usually test a certain amount of the production run to make sure it meets specification. In higher priced electronics these test are on going during the production run. In lower cost electronics these tests for quality control are usually done before the production run. This is to choose the best and most reliable components for the price level of the product in production. What this means to you, is that the quality of the components and quality control of the production runs are based on cost efficiency to the manufacturer. This is the reason for these type of efficiency variables in the products. The customer support telephone number for Emerson is 1-800-898-9020 between the hours of 9am-5pm CT. Give them the make and model number of the Clock/Radio and ask them for assistance with your problem. I hope this information helps you under the problem and reason these problems can occur in the products. Thank you for using FixYa and have a nice day.

This is a problem with either the a/c power or the Clock/Radio's internal timing crystal circuitry. The radio depends on the 60 cycle power source as the timing device. If this power is irregular or uneven in its delivery it can cause the timing circuits to lose or gain time. The Clock/Radio has a frequency tuned crystal that operates like the second hand on a clock. When the calibration for whatever reason is lost the crystal will not be able to perform the timing function correctly. The reason this does not happen in all Clock/Radios is that they usually have correction circuits. These circuits keep the crystal from drifting out of calibration during operation. Because of the low production cost of these Clock/Radios, the quality control is almost non existent. The components are variable and sometimes they do not stay within specifications. This problem is usually handled by quality control departments in the manufacturers facilities. They usually test a certain amount of the production run to make sure it meets specification. In higher priced electronics these test are on going during the production run. In lower cost electronics these tests for quality control are usually done before the production run. This is to choose the best and most reliable components for the price level of the product in production. What this means to you, is that the quality of the components and quality control of the production runs are based on cost efficiency to the manufacturer. This is the reason for these type of efficiency variables in the products. The customer support telephone number for Emerson is 1-800-898-9020 between the hours of 9am-5pm CT. Give them the make and model number of the Clock/Radio and ask them for assistance with your problem. I hope this information helps you under the problem and reason these problems can occur in the products. Thank you for using FixYa and have a nice day.This is a problem with either the a/c power or the Clock/Radio's internal timing crystal circuitry. The radio depends on the 60 cycle power source as the timing device. If this power is irregular or uneven in its delivery it can cause the timing circuits to lose or gain time. The Clock/Radio has a frequency tuned crystal that operates like the second hand on a clock. When the calibration for whatever reason is lost the crystal will not be able to perform the timing function correctly. The reason this does not happen in all Clock/Radios is that they usually have correction circuits. These circuits keep the crystal from drifting out of calibration during operation. Because of the low production cost of these Clock/Radios, the quality control is almost non existent. The components are variable and sometimes they do not stay within specifications. This problem is usually handled by quality control departments in the manufacturers facilities. They usually test a certain amount of the production run to make sure it meets specification. In higher priced electronics these test are on going during the production run. In lower cost electronics these tests for quality control are usually done before the production run. This is to choose the best and most reliable components for the price level of the product in production. What this means to you, is that the quality of the components and quality control of the production runs are based on cost efficiency to the manufacturer. This is the reason for these type of efficiency variables in the products. The customer support telephone number for Emerson is 1-800-898-9020 between the hours of 9am-5pm CT. Give them the make and model number of the Clock/Radio and ask them for assistance with your problem. I hope this information helps you under the problem and reason these problems can occur in the products. Thank you for using FixYa and have a nice day.This is a problem with either the a/c power or the Clock/Radio's internal timing crystal circuitry. The radio depends on the 60 cycle power source as the timing device. If this power is irregular or uneven in its delivery it can cause the timing circuits to lose or gain time. The Clock/Radio has a frequency tuned crystal that operates like the second hand on a clock. When the calibration for whatever reason is lost the crystal will not be able to perform the timing function correctly. The reason this does not happen in all Clock/Radios is that they usually have correction circuits. These circuits keep the crystal from drifting out of calibration during operation. Because of the low production cost of these Clock/Radios, the quality control is almost non existent. The components are variable and sometimes they do not stay within specifications. This problem is usually handled by quality control departments in the manufacturers facilities. They usually test a certain amount of the production run to make sure it meets specification. In higher priced electronics these test are on going during the production run. In lower cost electronics these tests for quality control are usually done before the production run. This is to choose the best and most reliable components for the price level of the product in production. What this means to you, is that the quality of the components and quality control of the production runs are based on cost efficiency to the manufacturer. This is the reason for these type of efficiency variables in the products. The customer support telephone number for Emerson is 1-800-898-9020 between the hours of 9am-5pm CT. Give them the make and model number of the Clock/Radio and ask them for assistance with your problem. I hope this information helps you under the problem and reason these problems can occur in the products. Thank you for using FixYa and have a nice day.

Dont think this model clock accuracy depends upon the supply frequency.
1. I have ICF C 318 with the same specification but works accurately (1 sencond) in 50 Hz.
2. there are some amazone complaints even from US (wherein 60 Hz exists)

3. Dont think a clock designer will depend on supply frequency. (many time, this varies even in a very good power network)

I'm not on this field of expertise but I could try giving you some tips. These cloks work by dividing the natural oscilations of a quartz cristal in the corresponding way to form "1 second". A quartz cristal like the one in your clock will oscilate at about 14080236 times per second. Your clock uses a specialised chip in order to count these oscilations and know they form "1 second". However, the problem is the following. These clocks doesn't compensate for frequency variation over the mains power line. You should always look firts at it's power ratings and determine if it requires 50Hz or 60Hz. Even if you use an adaptor to raise/lower the tension from 110 to 220 v or viceversa, this woun't correct the problem as the adaptor will leave the frequency unchanged. Unfortunately in order to make the required adjustments you woun't need a resistor or capacitor, but a whole bunch of them in order to make a frequency divider-convertor that's stable enough to give your clock a fixed time reference. One more thing, not all components have exactly the parameters noted on them. There's another thing called Tolerance. A 1Kilo Ohm resistor with 10% tolerance (most comon tolerance) can have any value with +/- 10% of it's noted parameters, and in this example, could have any value between 900 ohm - 1100 ohm. These clocks will need components with a very strict tolerance in order to have an acurate time reference. Note that they aren't atomic clocks, they simply use a larger chip that includes most of the clock, time reference, frequency analyser and divider. An atomic clock doesn't use quartz cristals, instead it relies on the natural oscilations of the very precise Cesium izotope atom. The rest of the atomic clock is made up in a similar way as usual clocks (more fixed and small tolerance of course :) ).