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NO TUNING,tuning voltage stays +29v,LM7000N is ok.

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What?

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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1 Answer

Cannot tune to any station.On APS, graph tuning bar comes up,but does not find any signal.


You have antenna connected?
Is TV set for broadcast or cable or?

May 21, 2015 | Televison & Video

Tip

Solution for the stability problem


GE and RCA SR-3 production suffers from an ill-advised change in tuning potentiometer. It causes the tuning to be unstable - the radio is almost unusable due to difficulty in tuning to stations and the radio has difficulty staying on stations.

The value of the pot is a bit unusual - 300k. I have found that a 500k pot, with 470 fixed resistors across each leg (low to middle, middle to high) allows the radio to tune the entire AM and FM bands, although dial calibration is really bad. The tuning voltage high and low pots will need to be adjusted at the very least, and the whole front end will probably need re-alignment.

I have modified at least a half a dozen of these radios this way, Fry's has an appropriate pot but the shaft is aluminum and needs to be machined. The radios are as stable as early production SR-3's, and are fine DX units.

The FM section can also benefit greatly from the narrow ceramic filter modification. I can routinely use the radio for stations over 100 miles away after the modification.

on Jan 14, 2009 | GE Superadio III AM/FM

1 Answer

Violin doesn't stay tuned


This is an intonation issue. If you can find a music store that works with violins, talk to someone there who will certainly be better informed than I am. At least they can tell you if it's worth your time to fix it, or more cost effective to replace it.

Apr 16, 2017 | Music

1 Answer

AUTO TUNING WONT RUN


Check and replace its main system control memory IC. If this IC is faulty, auto tuning will not work, or, the TV will store any received channels. If the TV do not tune into channels too, the AGC voltage to its tuner, and tuner itself should be checked.

May 27, 2013 | TCL L32D20

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Why my fan does'nt spinn


Hello
Check the voltage comes to the fan first. If voltage is there and fan does not spins, either the fan is strucked by some external substances like dust or so. Check whether it can be turned freely by hand. If there is no fiction found in tuning the fan, replace it. It is faulty. If it is dusty, clean it. OK.

Jan 17, 2012 | Crown Audio Players & Recorders

1 Answer

How do i tune the channels on a toshiba rc3910


Hi
Before tuning the set to auto tune mode, make sure the antenna or cable, whatever may, connected to its appropriate sockets at the back of the set firmly. To make it autotune:

As new services are broadcast, it will be necessary to

re-tune the television in order to view them.

Auto Tuning will completely re-tune the television

and can be used to update the channel list. It is

recommended that Auto Tuning is run periodically to
ensure that all new services are added. All current

channels and settings, i.e. locked channels, will be
lost.

[1] Select the SETUP from the main menu by using

Up or Down buttons. Press OK and Setup menu
will be displayed.

[2] Select the Installation from the Setup menu

by using Up or Down buttons. Press OK and
Installation menu will be displayed.

]3] Select Automatic Channel Scan from the Installation

menu by using Up or Down buttons and press OK.

A screen will appear warning that previous digital

programmes and settings will be deleted. Select Yes
and press OK to continue with the Auto tuning.

The television will start to search for all available

stations.You must allow the television to complete

the search. When the search is complete the Auto

tuning screen will display the total number of
services found.

* After search is completed for digital channels, a

message asking whether to search for analogue
channels appears on the screen

** Press the OK button to search for analogue

channels. The following menu appears on the screen
for analogue channel search
OK.

Jul 10, 2011 | Toshiba Televison & Video

1 Answer

How to set the time on my RCA RS2625


Press the clock button once. Hour number flashes. Use the tuning button to adjust the hour. Press clock button again and use tuning button again to set the minutes. There is a program /preset button below the tuning button, use that button to set, make time stay.

Sep 09, 2010 | RCA RS2652 Shelf System

1 Answer

I have just returned from Dubai with a 2 year old Samsung TV. Will it be ok to use in the UK ? Is there a voltage setting which needs to be changed ?


No need of voltage settings just plug in tv and perfom auto tuning/ scan channels to update data in memory of UK cable.

Jun 20, 2010 | Televison & Video

1 Answer

Digital TV Tuning problem


I would try letting the set autoprogram again.

Mar 07, 2008 | Televison & Video

1 Answer

Tuner


This sounds major.....

The signal detection used in both radios and TV sets is via special voltage sensitive diodes which alter capacity as the voltage across the diode changes.
You actually change the voltage across the diodes as you move the tuning dial.

In your case the diode only sees one voltage and is locked to a certain station, because you are not altering the capacity to re-tune to another station...

So it appears that you have lost the ability to alter the DC voltage across the diode...

The design of the tuning knob may be where this fault lies, where the physical action of turning the tuning knob does not transfer the mechanical action to the item that changes the DC voltage to the diode....maybe you have systen that uses a long cord would around pulleys that gives you nice control over the tuning maybe its just a broken tuning cord...
Maybe the tuning is done by just a simple variable resistor I'm not familiar with this system but I have given you the bascics to start on...Unplug the cord from the AC wall socket then remove the top of the cabinet and have a look to see what moves when you turn the tuning knob it will soon become apparent if there is nothing moving when you turn the knob and thus lead you on to the problem....
Maybe the knob is just loose on its drive shaft...

Cheers From YUBEUT

Nov 22, 2007 | Sharper Image SA253 CD Shelf System

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