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cobra 18 ultra w/weather no rx or tx
Posted: Friday 16th Mar 2007, 11:12
by breakdown5
hello again. cobra 18 ultra...no rx/tx but weather band works fine... had a bad final i think... replaced final trans and resistor next to it along with the driver trans but ng ??? any ideas.... when i key the tx light does come on but no power output at all? thanks!
18
Posted: Monday 9th Apr 2007, 14:45
by ouxly40
If that model has the little stand-up boards - there is your problem. Re-solder them.
Posted: Tuesday 10th Apr 2007, 0:50
by breakdown5
no stand up boards.. but thanks!
Posted: Tuesday 10th Apr 2007, 0:51
by breakdown5
no stand up boards.. but thanks!
Re: obra 18 ultra w/weather no rx or tx
Posted: Tuesday 10th Apr 2007, 3:43
by Rick
If the radio has a SM5123A PLL. Check D18, D19 and IC5 if one or more have failed then you will have on RX and TX.
Rick.
Posted: Wednesday 11th Apr 2007, 3:53
by breakdown5
my cobra 18 ultra has a lc7185 pll so not sure where to look. thanks rick for the info!!
Re: obra 18 ultra w/weather no rx or tx
Posted: Wednesday 11th Apr 2007, 8:40
by Rick
Do you have the schematic diagram for the radio?
Rick.