Cobra 2000 Taiwan model no RF out no mod no clock/counter

[357]

what a pain in the ass...glad its done.
Just the counter to do

 

[nomadradio]

Pretty serious camera. I can read the 1983 date code on the 8719 PLL chip. Doesn't say much about the radio's age. It was built with a MB8734. The 8719 is an upgrade, usually to get more channels than the 8734 can muster without a crystal kit. The date printed on it won't have much to do with the radio's production year.

Gotta love it when a plan comes together. Congratulations on a job well done!

73

 

[nomadradio]

The counter's double-sided pc board is a PITA.

You'll find some capacitors have only a "doughnut" pad on the solder side of the board. Each hole has a plate-through metal sleeve joining the top foil to the bottom foil at each hole. Some of these round pads that just come loose can be remedied by laying the excess length of the capacitor lead over onto an adjacent pad that's connected by a top-side foil trace.

Got some pics here somewhere, maybe notes about which caps get a "foldover" on one lead wire. Should probably track those down.

The plate-through sleeves are just too easy to pull out of the board if all the solder isn't removed.

73

 

[357]

The counter's double-sided pc board is a PITA.

You'll find some capacitors have only a "doughnut" pad on the solder side of the board. Each hole has a plate-through metal sleeve joining the top foil to the bottom foil at each hole. Some of these round pads that just come loose can be remedied by laying the excess length of the capacitor lead over onto an adjacent pad that's connected by a top-side foil trace.

Got some pics here somewhere, maybe notes about which caps get a "foldover" on one lead wire. Should probably track those down.

The plate-through sleeves are just too easy to pull out of the board if all the solder isn't removed.

73

I managed to replace them all ok. I see what you mean with the doughnuts. the solder wicked up to the top side luckily.
The counter is still dead.
Same deal is dimly lights 88.888.88 and nothing at all with the radio on.

Where should I start probing?

This diode has 0.8 volt at the banded end and 0.03v on the other.
I cant find the 5v

 

[357]

Found the problem while listening to the 1111 burping on ch38
D530. I jump that the counter works

 

[357]

used a 1n4003 to replace it