20-08-2018, 09:02 AM
Hi Lawrence
I dont think the problem is with the VDR, my question regarding it was more of a learning thing.
I had my meter probe soldered to the wrong spot, there is actually 1.4v across the VDR.
Sorry if that was a red herring.
But I am now comparing with the voltages measured with regard to +ve ground taken from a working ITT Colt, and getting more frustrated every second.
I am going to replace T305, its a silicon NPN, as I am getting a 0 volt reading on its collector, and there should be about .7v there.
I have checked and replaced R319, it was about 90 ohms high. There is approx 560 ohms between its collector and ground, so the IF primaries seem OK.
Mike
I dont think the problem is with the VDR, my question regarding it was more of a learning thing.
I had my meter probe soldered to the wrong spot, there is actually 1.4v across the VDR.
Sorry if that was a red herring.
But I am now comparing with the voltages measured with regard to +ve ground taken from a working ITT Colt, and getting more frustrated every second.
I am going to replace T305, its a silicon NPN, as I am getting a 0 volt reading on its collector, and there should be about .7v there.
I have checked and replaced R319, it was about 90 ohms high. There is approx 560 ohms between its collector and ground, so the IF primaries seem OK.
Mike
