UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Biggles · 21st Jun 2019, 6:52 pm

When you picked up the 145MHz-ish local oscillator signal as per post #7, did you try changing the 535 receiver's channel frequency, say, by 100KHz or so and see whether the local oscillator signal shifted by 100KHz too? If it did then it's a sure sign that the PLL is locked and functional and you can direct your attention to some other fault. It may save you a bit of work, and chip changing. I have found the circuit diagram for the receiver but my copy is not very clear.
Alan.

21st Jun 2019, 6:52 pm	#14
Biggles Rest in Peace Join Date: Feb 2004 Location: Hexham, Northumberland, UK. Posts: 2,234	Re: Signal Communications Corp R535 Receiver When you picked up the 145MHz-ish local oscillator signal as per post #7, did you try changing the 535 receiver's channel frequency, say, by 100KHz or so and see whether the local oscillator signal shifted by 100KHz too? If it did then it's a sure sign that the PLL is locked and functional and you can direct your attention to some other fault. It may save you a bit of work, and chip changing. I have found the circuit diagram for the receiver but my copy is not very clear. Alan.