spectra A5 power up

fidel · Post by **fidel** » Sat Feb 17, 2007 8:16 am

I have a a5 that powers up automaticly and i cannot turn it on or off by the power button and have tried a different head and dosnt change i looked in the rss and cant find a setting it is a d43 model please advise thanks lots Terry N0ACP

Will · Post by **Will** » Sat Feb 17, 2007 9:56 pm

Check for added jumper on the control head interface board, or on the back side of the Command board. Jumper is from fused A+ to Switched A+. This was done to some Spectras so they were ON all the time, or used with a battery disconnect switch so the Spectra comes on with application of battery.

resqguy911 · Post by **resqguy911** » Sun Feb 18, 2007 7:43 am

Where is this jumper located on the interface board?

txshooter · Post by **txshooter** » Sun Feb 18, 2007 11:19 am

A modification to the Spectra A5 head was made to ensure the radio had contiuous power and could not be powered down from the head by the end user. This modification was done priomarily to AVL radios and most of these on the surplus market cam from the Houston Fire Department in all but new condition. I personally had a ton of these at one time.

Here are a few pictures to help out on this modification. It is very simple and easy to do.

These pictures were taken by another, but I have robbed them for the purpose of showing the modification you need to do to fix this problem.

#1 View of the head and position of the Mod.

#2 Closeup of the wire that needs to be removed or cut.

#3 Closeup of the wire than needs to be removed or cut with the frame removed.

#4 Closeup after the wire has been cut.

#5 What this should look like when you are done.

This same question has been asked a ton of times, but don't think anyone has included Photo's to show the simple modification needed. It May be helpful if this is included in the new knowledge base.

Jim202 · Post by **Jim202** » Sun Feb 18, 2007 11:43 am

I think that is jumper JU07.

Jim

fidel · Post by **fidel** » Sun Feb 25, 2007 11:40 am

I have looked on the control board and canot fined a jumper and tried diferent heads and it still does the same. Anyother help would be greatly appreciated N0ACP

Will · Post by **Will** » Sun Feb 25, 2007 1:41 pm

Recheck for added jumper on the control head interface board. It could be a small 000 resistor or a wire jumper.

Or try a different known good control head interface board ( the one that connects the command board to the control head).