I've checked menu 4.9, it's set to 700hz as it should be. Now I'm thinking that the 20Mhz clock might be the problem - if there's no 20Mhz, perhaps that stops the sidetone from being generated? And also stops the optical encoder output from being sampled?
So I've put my scope X10 probe on pins 9 and 10 of the chip - no signal at all. No signal on the 20mhz crystal pins either. No DC either. The crystal is connected to the chip OK, no dry joints or cracked tracks.
So I've replaced the 20 Mhz crystal. No change. tested the old crystal, perfect.
Baffled again.
Please, can someone with a functioning QCX and a ' scope let me know, do you get a 20mhz signal on the chip? and what DC voltage?
As ever, any help gratefully appreciated.
Julian
G4ETS
