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Old 25th Sep 2023, 8:16 pm   #1
Silversdream
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Default FM oscillator trimmer - Roberts R505

I have a couple of Roberts R505 radios where i have changed the elec Caps and brought them back to life. My local BBC station is Radio Sheffield on 104.1.
One radio picks this up where the other will not tune far enough and wont receive it. From a past thread on here i think i need to tune the FM oscillator trimmer. Hopefully someone can highlight a photo of the pcb showing which item i need to trim.
Many thanks
Paul
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Old 26th Sep 2023, 9:51 am   #2
John_BS
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Default Re: FM oscillator trimmer - Roberts R505

It's C2 on the FM tuner module
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Old 26th Sep 2023, 10:21 am   #3
Silversdream
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Default Re: FM oscillator trimmer - Roberts R505

Thanks John
I will sort tonight (currently at work)
Is there a data sheet showing what C1, C21 etc adjust ?
Thanks again
Paul
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Old 26th Sep 2023, 12:36 pm   #4
Graham G3ZVT
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Default Re: FM oscillator trimmer - Roberts R505

Quote:
Originally Posted by Silversdream View Post
Is there a data sheet showing what C1, C21 etc adjust ?
Thanks again
Paul
https://www.service-data.com/product...10/7342/m15710
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Old 26th Sep 2023, 12:36 pm   #5
DMcMahon
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Default Re: FM oscillator trimmer - Roberts R505

The Manufacturers Service Data available for download from top right of screen (under Instant Downloads) lists the various adjustments, the ERT Service Data also explains the various adjustments.

David
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