On 4/26/2019 6:31 PM, Kenneth Ketner via Groups.Io wrote:
Greetings Jim:Hi Ken,
That's the latest version of the PCB.
I have a schematic also marked V1.2B. I don't have photo capabilities just now, so I can't send a photo (perhaps later if needed).I was hoping that you might have a cell phone with camera to take a photo or two of the PCB as it currently exists.
Yes, that is correct, no keying, just a steady sidetone upon powering up the PCB.
That looks right.
top of R28 10V; Q15 col 10V, base 4V, emitter 0.0V ??fault??Yes, the problem is here. The base should be at 5 volts and the emitter about 4.3 volts. It appears that the emitter is shorted to ground directly (solder blob?) and not connected to ground through the 220 Ohm emitter resistor. The sidetone signal comes off of the emitter to Q16.
; R40 bottom 5V, top 4.9V; R38 top 4V; R37 top 0.0V.Well let's not do that yet. Are there any hams in Lubbock, TX that can help you? Do you have a good magnifier that you can use to look at the board in the area of R36? Do you have the ability to unsolder parts without damaging the PCB? If any of the above get a "NO" answer, then send me the PCB. Use my callbook address:
PO Box 108
Fenton, MI 48430
It ain't fun sometimes..... :-)