Any radio engineers out there?

SD1too · 28th February 2009, 07:54

I have a high-line, boot mounted o.e. Philips radio. It was behaving as if the FM aerials weren't connected; a station "search" produced perhaps one or two results on the whole band, even using "search sensitive"! It would also refuse to hold on to BBC R4, deciding to go off on a fruitless search for a better frequency. In the Service mode the Quality reading (whatever that means) was 0 or 2, whereas 12 to 15 is more normal.

It was discovered by substituting another unit that the radio is faulty. I've taken the covers off and it's rather full of PCBs with no sign of any burnt-out components. If I could get a circuit diagram, is there anyone with a better knowledge than me of RF and IF stages who would like to have a go at it? A tall order I know, but I thought I'd ask!

Simon.

28th February 2009, 07:54	#1
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,520 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Any radio engineers out there? I have a high-line, boot mounted o.e. Philips radio. It was behaving as if the FM aerials weren't connected; a station "search" produced perhaps one or two results on the whole band, even using "search sensitive"! It would also refuse to hold on to BBC R4, deciding to go off on a fruitless search for a better frequency. In the Service mode the Quality reading (whatever that means) was 0 or 2, whereas 12 to 15 is more normal. It was discovered by substituting another unit that the radio is faulty. I've taken the covers off and it's rather full of PCBs with no sign of any burnt-out components. If I could get a circuit diagram, is there anyone with a better knowledge than me of RF and IF stages who would like to have a go at it? A tall order I know, but I thought I'd ask! Simon. __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.