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PM1500 fuse location
Posted: Wed Oct 12, 2011 1:15 pm
by tskilbride
I was probing around on the DB25 connector looking for a way to crossband with a TK-890. Anyways, I accidentally shorted two pins together. I'm hoping I just blew a fuse. I took the bottom panel off the radio and the control head apart. Didn't see any fusees. Do I need to tear into the radio some more or is there another fix for this?
Tim
Re: PM1500 fuse location
Posted: Thu Oct 13, 2011 11:49 am
by Motoboy
Could be a number of things. Do you know which two pins you shorted?
Re: PM1500 fuse location
Posted: Fri Oct 14, 2011 3:49 am
by Jim202
tskilbride wrote:I was probing around on the DB25 connector looking for a way to crossband with a TK-890. Anyways, I accidentally shorted two pins together. I'm hoping I just blew a fuse. I took the bottom panel off the radio and the control head apart. Didn't see any fusees. Do I need to tear into the radio some more or is there another fix for this?
Tim
It is easy to blow internal lands on the circuit board. once damaged, there is no way to repair a damaged land. If your lucky, you might be able to run a wire external to the board to jump the blown land location.
Problem is the service manual for the radio is done very poorly. I have spent hours trying to trace circuits in that radio and the XTL mobiles. Motorola needs to fire the 1st grade children that created those documents.
Jim
Re: PM1500 fuse location
Posted: Thu Oct 20, 2011 4:10 pm
by tskilbride
Motoboy wrote:Could be a number of things. Do you know which two pins you shorted?
I believe it was pin 20(battery voltage) and pin 19(ground).
Tim
Re: PM1500 fuse location
Posted: Fri Oct 21, 2011 4:02 pm
by Jim202
tskilbride wrote:Motoboy wrote:Could be a number of things. Do you know which two pins you shorted?
I believe it was pin 20(battery voltage) and pin 19(ground).
Tim
Unless you had a low current fuse feeding the + battery voltage line, your radio is probably toast. The internal lands of the circuit board have acted as the fuse. Problem is you can't get to them to repair the blown trace. Those circuit boards are multi layered. the power and ground are generally the 2 center layers.
Unless your real good reading the lousy circuit diagrams, good with a volt meter and have a small fine tip soldering iron, your chances of fixing the radio diminish by what you lack in skills.
Jim