President Lincoln Microcontroller Reset Experiments
I do some experiments to repair a President Lincoln radio which has a problem with the display not turning on sometimes.
This also applies to the HR2510 and HR2600 radios from Uniden and President.
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I have a 2519 and the radio shack version
Great video, Scott! I have a couple Lincolns that have both suffered this issue in the past…always bugged me!
Can I ask you the value of the parallel resistor you added?
Would like to carry out this fix…
Love these radios, still have a couple 2510’s and a few parts 2510 chassis. I was on your forum years ago, remember Rick’s “Test your knowledge” game on the forum for the Lincoln / HR2510? I participated in the first one trying to sort out the no transmit problem. I learned a lot from your site years ago, enjoyed it when I was big into radio! Seeing the Lincoln here made me think of that. Nice video on this.
Nice repair, Scott. An interesting problem that appears to be designed into the radio. The only concern with changing the value of the pull-up resistor would be the ability of the M51953 to sink the current when pulling the line low – it's rated at 6 mA so that shouldn't be a problem.
On-the-edge design from the manufacturer….oh dear!
A 100k pullup on the IC's open collector output is a bit too high IMHO and is compromising the signal via the AC coupled cap C388. Not a great pulse eh!
The PNP transistor is a series pass setup with the NPN just driving it's base from the pulse.
Note: C392 is the programmable delay cap on the M51953 IC. This delays the open collector output of the IC after the correct supply voltage is reached. Nominal 10nF seta a 3.4mS delay……Not sure what size you have there but I guess you could play with that delay also.
will have to drag my Lincoln out of the cupboard and do this mod as it has the same issue
Had this very same issue with a 2510 about 15 years ago. Same problem same solution. There was an article about this on some Ham forum years ago it apparently was a common problem. Great Video sir
Love to see more radio videos
Nice find:-)