Roberts R24 FM fault - UK Vintage Radio Repair and Restoration Discussion Forum

Brettski · 21st Dec 2017, 9:54 pm

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

paulsherwin · 21st Dec 2017, 10:00 pm

Have you tried cleaning the wavechange switch contacts thoroughly with contact cleaner such as Servisol 10?

Brettski · 21st Dec 2017, 10:15 pm

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 ��

Richard675 · 22nd Dec 2017, 11:17 am

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.

martinhog · 22nd Dec 2017, 10:49 pm

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.

Brettski · 23rd Dec 2017, 3:10 pm

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 .

ronbryan · 24th Dec 2017, 12:43 am

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

Brettski · 24th Dec 2017, 5:20 pm

I will try that tomorrow.

Many thanks, will post with results.

Brettski · 27th Dec 2017, 2:47 pm

Never got onto it yesterday and back at work now. But will try and get onto it on Sunday.

21st Dec 2017, 9:54 pm	#1
Brettski Tetrode Join Date: Dec 2017 Location: York, North Yorkshire, UK. Posts: 65	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
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,936	Re: Roberts R24 FM fault Have you tried cleaning the wavechange switch contacts thoroughly with contact cleaner such as Servisol 10?

21st Dec 2017, 10:15 pm	#3
Brettski Tetrode Join Date: Dec 2017 Location: York, North Yorkshire, UK. Posts: 65	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
Richard675 Pentode Join Date: Jun 2009 Location: Braintree, Essex, UK. Posts: 170	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.

22nd Dec 2017, 10:49 pm	#5
martinhog Pentode Join Date: Aug 2005 Location: Ashford, Kent, UK. Posts: 204	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.

23rd Dec 2017, 3:10 pm	#6
Brettski Tetrode Join Date: Dec 2017 Location: York, North Yorkshire, UK. Posts: 65	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 .

24th Dec 2017, 12:43 am	#7
ronbryan Octode Join Date: Jan 2003 Location: Guildford, Surrey, UK. Posts: 1,959	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
Brettski Tetrode Join Date: Dec 2017 Location: York, North Yorkshire, UK. Posts: 65	Re: Roberts R24 FM fault I will try that tomorrow. Many thanks, will post with results.

27th Dec 2017, 2:47 pm	#9
Brettski Tetrode Join Date: Dec 2017 Location: York, North Yorkshire, UK. Posts: 65	Re: Roberts R24 FM fault Never got onto it yesterday and back at work now. But will try and get onto it on Sunday.