Question about Sony KP-51HW40 51" Rear Projection Television

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Frequency lock One of my two NTSC receivers cannot keep locked on frequency (the one on the right). It drifts out to BW and mostly snow, then snaps back in. This cycle takes about 2 to 3 seconds, but is continuous. The problem is intermittent, but the trouble is there much more often than not. There are no mild occurrences of the problem, it's either happening, or not.

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  • 71 Answers

You got cold contacts on the tuner. Redo all coils and IC's solderings in the tuner or replace it if is to complicate.

Posted on Dec 06, 2007


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1 Answer

My hr2600 shows error 3 when it is keyed up and does not transmit

0 = Transmitter Timeout timer has timed-out
1 = Transmit Frequency is lower than TX Lockout Lower Limit
2 = Transmit Frequency is greater than TX Lockout Higher Limit
3 = Phase-locked-loop (PLL) won't lock at this transmit frequency
4 = PLL is intermittently coming out of lock during transmit
*If your radio displays error 3 or 4, don't keep trying to transmit on this frequency. The cause of the problem could be low power supply voltage to the radio or the radio's VCO loop needs adjustment. Refer to a qualified technician for service. Contact the installer of the chip first. If, however, you installed the chip yourself, contact a qualified technician for service.

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Freq displat out on Eton sat 750 on airband

It should not be very significant. The gap between two neighboring channels in AM/SW can, on some radios, be set to 9 kHz or 10 kHz depending on countries. For FM the separation is about 100 kHz or 0.1 MHz. Set the right frequency then use the Lock feature. It will prevent any shift/drift of frequency ( and any other changes) until you unlock.

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NOAA weather broadcasts are continuous, therefore scanning is interrupted when your receiver locks on that frequency. You need to lock out all NOAA channels

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Galaxy dx 2547 base cb frequency drift problems

for upper ssb adjust L21 for 16.51250 mhz . adjust L22 for 16.50750 for lower ssb. you do have a frequency counter don't you ?

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When I tried to change the frequency on my Motorola CLS 1110, I see a lock graphic. How can I get rid of the lock so I can change the frequency. Right now it has only 1 and 2 frequency and I need 4. Thank...

To unlock (or lock) your keypad hold the menu button in for 3 seconds.

Here is a link to the user guide. The CLS1110 is a 1 channel radio. It has several frequencies built in to choose from.

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1 Answer

Keeps on locking out channels how do you un lock

Here it is, straight from the manual:

clearing a locked-out frequency
To clear a locked-out frequency, select that frequency (see
“Reviewing Locked-Out Frequencies”), then press CL.
If all locked-out frequencies are cleared within a bank, No
Lockout appears.
clearing all locked-out frequencies in a search bank
1. Press SRCH.
2. Select the search bank in which you want to clear all
locked-out frequencies.
3. Press FUNC then press L/OUT. Lockout list appears.
4. Press FUNC then 6. Clear entire list ? Press 1 to clear all, any
other key aborts appears. Press 1 to clear all locked-out
frequencies. List cleared. appears for about 2 seconds.
Press any key other than 1 to cancel clear.

I hope this helps. If it does, please take a moment to give me a rating. A rating of "very helpful" would be greatly appreciated.

Nov 23, 2009 | Radio Shack Pro-97 Handheld Scanner

1 Answer

What is a digital pll fm modulator

Hello towturtle,

An FM modulator is a little box that plugs into your receiver antenna connection. It sends a low-level signal directly to the radio which you then tune in on the FM band just like a radio station. They're handy for older receivers that do not have AUX, USB, or iPod inputs. You plug your device into the modulator and it plays through the receiver. The "PLL" just means that the tuning uses a technology called "phased lock loop" which keeps the frequency from drifting.

Hope this helps.

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Wrong time on Emerson Smart Set clock

This is a problem with the clocks tuning crystal. Digital clocks have a crystal that is tuned to run at a certain frequency to keep the clock working correctly. These clocks have a problem with that crystal keeping the frequency locked at the correct working frequency. This problem will sometimes cause the clocks to run fast due to a running frequency higher than the regulated frequency and sometime slow due to a running frequency running lower than the regulated frequency. The only way to fix this problem is to either adjust the crystals frequency to the correct frequency and lock it. Or change the crystal. Both these types of service require tools and test equipment to fix the problem. This is usually best handled by a service center. The Emerson customer support telephone number is 1-800-898-9020. Give them the make and model number of your clock radio and ask them for assistance. I hope this information helps you with your problem.

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Marconi 2951 radio test set vintage

possibly a power supply problem - check current drawn from the power line compared with your other 2951. any disturbance in power supply voltages can kill the afc/pll in older service monitors. if you have the manual check the ps voltages

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1 Answer


Hi Dude

Presetting channels for radio stations is generally all the same on most systems. Select the frequency you want and then HOLD IN the preset button you want until it locks to the frequency into the new preset. Good luck, and happy presetting :)


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