MOTOROLA CDM 1550

JD · Post by JD » Mon Oct 16, 2006 5:51 am

I have a CDM 1550 that will lock up after being on for less than 2 or 3 minutes. No controls work on the radio, you have to unplug it to turn it off. The squelch will sometimes open also..

Has any one experienced this problem ?

Is it a firmware and or software problem ?

HLA · Post by **HLA** » Mon Oct 16, 2006 8:00 am

where is it mounted, is it overheating?

JD · Post by JD » Mon Oct 16, 2006 8:25 am

On my work bench, and yes the heat sink gets very warm after about 5 minutes on.

Post by **wavetar** » Mon Oct 16, 2006 8:49 am

When it works, does it put out proper RF power? It sounds like the RF amplifier is running all the time, if the radio is getting very warm after a few minutes. Are you able to measure current drain of the unit during standby/tx?

Todd

JD · Post by JD » Mon Oct 16, 2006 11:12 am

It will not transmit at all, light comes on ,no output. Current is at specs in receive.

HLA · Post by **HLA** » Mon Oct 16, 2006 12:46 pm

what does the voltage drop to and the amp draw when you transmit? do you have an antennae hooked up to it? is it possible the antennae is grounded out? if not it needs a trip to the repair shop.

RFguy · Post by **RFguy** » Mon Oct 16, 2006 1:35 pm

What is the current draw on standby? Sounds funny that the unit heats up agter 5 mins.

KuhnElectronics · Post by **KuhnElectronics** » Mon Oct 16, 2006 1:49 pm

FYI

had a cdm750 do the same exact thing...

to a trip to the depot...came back with NO TROUBLE FOUND....but mysteriously the problem went away...

thank you El'Paso!

Post by **escomm** » Mon Oct 16, 2006 2:56 pm

KuhnElectronics wrote:thank you El'Paso!

What, no free upgrade to a CDM1250?

KuhnElectronics · Post by **KuhnElectronics** » Tue Oct 17, 2006 4:34 pm

hahah...even better...today we got back a CDM1550+LS that was powering on and off by itself...

returned with a new main board...and a new control head!

Thanks El'Paso for sending my heatsink back!