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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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21st Dec 2017, 9:54 pm | #1 |
Tetrode
Join Date: Dec 2017
Location: York, North Yorkshire, UK.
Posts: 65
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Roberts R24 FM fault
Hi there. I have just received a Roberts R24 to use until I have finished restoring my R600. The radio is in quite good condition but doesn’t work on FM. Could this be reversed polarity issues or is their something else I should be checking? When FM is selected there is static but will not tune any station.
Any help would be most appreciated. Brett |
21st Dec 2017, 10:00 pm | #2 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,936
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Re: Roberts R24 FM fault
Have you tried cleaning the wavechange switch contacts thoroughly with contact cleaner such as Servisol 10?
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21st Dec 2017, 10:15 pm | #3 |
Tetrode
Join Date: Dec 2017
Location: York, North Yorkshire, UK.
Posts: 65
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Re: Roberts R24 FM fault
Hi Paul, not as yet. I will have a proper poke about on Sat. I will certainly try some deoxit.
I wondered if anyone had come across this problem on this model before. Many thanks, will put some piccys up of the R600 when it’s done �� |
22nd Dec 2017, 11:17 am | #4 |
Pentode
Join Date: Jun 2009
Location: Braintree, Essex, UK.
Posts: 170
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Re: Roberts R24 FM fault
Not familiar with this model but had a similar experience with a Grundig portable. The fault was down to a daughter board that contained the FM front end. The solder joints where it met the main PCB needed remaking.
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22nd Dec 2017, 10:49 pm | #5 |
Pentode
Join Date: Aug 2005
Location: Ashford, Kent, UK.
Posts: 204
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Re: Roberts R24 FM fault
Is the FM aerial connected ? , there is a flying lead from the PCB that is connected to the aerial by a sprung 'terry' clip, seen a few where the clip has come off.
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23rd Dec 2017, 3:10 pm | #6 |
Tetrode
Join Date: Dec 2017
Location: York, North Yorkshire, UK.
Posts: 65
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Re: Roberts R24 FM fault
All hi. Thanks for the responses so far . I’m in the unit at the moment. All the switches have been cleaned and the aerial clip has been unclaimed cleaned and put back on again. Still no joy . I will keep going .
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24th Dec 2017, 12:43 am | #7 |
Octode
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,959
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Re: Roberts R24 FM fault
You could check to see if a DC supply is reaching the tuner by locating D302 (near the VHF switch on the pcb) and with VHF selected, measure between the D302 diode cathode (+ or bar end) and chassis with a voltmeter. You should read about 8 Volts if the supply is getting that far.
Ron |
24th Dec 2017, 5:20 pm | #8 |
Tetrode
Join Date: Dec 2017
Location: York, North Yorkshire, UK.
Posts: 65
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Re: Roberts R24 FM fault
I will try that tomorrow.
Many thanks, will post with results. |
27th Dec 2017, 2:47 pm | #9 |
Tetrode
Join Date: Dec 2017
Location: York, North Yorkshire, UK.
Posts: 65
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Re: Roberts R24 FM fault
Never got onto it yesterday and back at work now. But will try and get onto it on Sunday.
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