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Old 3rd May 2024, 10:31 pm   #1
Richard A
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Default Roberts R606 & LP1402 Module

Dear Group,

I have a Roberts R606 with intermittent MW & LW.

Specifically, if the LP1402 module is moved the problem comes and goes. Loosening the three mounting screws makes the problem a bit better.

Of note, when the station reappears after wiggling the module, retuning might be required. I am fearing shorting vanes on the tuning capacitor.

Has anybody had experience of this and can anything be done with the vanes?

Many thanks,

Richard
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Old 4th May 2024, 11:33 am   #2
Radio tirana
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Default Re: Roberts R606 & LP1402 Module

Hi Richard and welcome
I don't have any direct experience of this particular module but I would recommend using the (search this website) box at the top of the page.
It seems there are ways of flushing out the tuning capacitor with Servisol and IPA. other members have had success with this method and I am sure one of them will be along to advise soon.
Nice to see another member of the Oxford chapter
Kind regards RT
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Old 4th May 2024, 12:07 pm   #3
G6Tanuki
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Default Re: Roberts R606 & LP1402 Module

I had a similar problem, though affecting FM only, on my R606MB, which turned out to be poor soldering on the very thin flat 'tape' connecting leads from the polyvaricon to the PCB.

They looked OK at first glance but a bit of magnifying glass action showed that the solder had not properly wetted the thin flat tape leadouts, a few seconds with a soldering iron and some fresh 60/40 cured the jumpy tuning.
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Old 4th May 2024, 4:29 pm   #4
Richard A
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Default Re: Roberts R606 & LP1402 Module

Many thanks for your replies.

I will disassemble the module in the coming days.

Thanks again,

Richard
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Old 7th May 2024, 7:15 am   #5
Pilot Mariner
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Default Re: Roberts R606 & LP1402 Module

I've had problems with the ceramic resonator on all my R606MBs. They seem very temperature dependant and obviously only affect MW & LW.
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Old 11th May 2024, 6:41 pm   #6
Richard A
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Default Re: Roberts R606 & LP1402 Module

Got it going!

5 second fix but a lot more time with disassembly and re-assembly. Joint with the tiniest amount of solder that eventually gave up - obviously passed production test and presumably a few years of use.

Thanks again for all your responses.
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Old 12th May 2024, 4:42 pm   #7
Radio tirana
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Default Re: Roberts R606 & LP1402 Module

Great result Well done,

Kind regards RT
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Old 12th May 2024, 4:52 pm   #8
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Default Re: Roberts R606 & LP1402 Module

Good to hear you got it going again!! The 606 is a neat little radio, I currently have one in my bathroom to listen to Greatest Hits Radio while shaving and brushing my teeth in the morning.
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