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no TX on president jackson
Posted: Friday 24th Sep 2010, 1:26
by sparky7083
Radio Make and Model: President Jackson
PCB Number: 042
PLL Number:
Test gear available: freq counter, multi meter, dummy load
Symptoms:No TX
What is working: recieves ok, eveything else appears ok
What has been tried:nothing as yet
Did it suddenly happen ?:
Anything else that may be of help?:
Does any one know the location of the darlington pair in a Jackson (which two trannies)...I`m told that the are faulty in this radio I have just got. Also could do with alignment details
Re: no TX on president jackson
Posted: Monday 27th Sep 2010, 11:15
by zodiac
I think you've been misinformed, there are no darlington transistors in the 042 boarded Jackson.
Is the TX light coming on when you key the mike ?.
Re: no TX on president jackson
Posted: Monday 27th Sep 2010, 22:15
by sparky7083
It sure is matey.....last night had a good look at radio and found several dry joints.....now when I turn radio on there is sound from speaker for about 2/3 secs then it goes quiet.....when I then key mic I have output and a freq reading and I can hear my voice on a neighbouring President Lincoln, when mic is un keyed I get sound again for a few seconds then it goes quiet .not checked on recieve as yet....
Re: no TX on president jackson
Posted: Saturday 2nd Oct 2010, 18:58
by spikeselectronics
Heres something to try. Turn the radio circuit side up and turn it on. When the receive goes quiet, take an end of a toothbrush and start pushing down on the board in little areas of the board. I suspect that you have a cold solder joint somewhere. When you find the spot that makes the sound come up, hold it down with the toothbrush handle, unplug the radio from the power supply, then take the soldering iron and hit all the soldering pads for about a half of an inch around the area. Let all the soldering points cool. Remove the toothbrush, turn off the radio, plug the power back in, and then turn on the radio. This should solve your problem, if not, repeat the steps around that area. I known that this should solve your problem.
Spike1846
Re: no TX on president jackson
Posted: Saturday 2nd Oct 2010, 19:33
by sparky7083
Cheers for that bloke..........I`ll give it a try......
Re: no TX on president jackson
Posted: Sunday 3rd Oct 2010, 3:07
by spikeselectronics
If don't cure your problem, write back and let me know. Your very welcome.