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cdm1250 power-up issue

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N1GJB

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Sep 27, 2008
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Hello all,

I have a cdm1250 I bought used off a friend. It is hooked up to the proper fused power plug and powered by a trip-lite power supply that powers up my other 1250 just fine. This particular radio, however, will not power up properly... all I get is a ticking noise from the radio's speaker.

I tried the ignition sense jumper method with no luck.

I tried pulling the control head off the radio (it is setup as a dashmount) and checked out the ribbon cable, which is in tact from what I can tell, and put it all back together, but there is no change.

I have lifted the top cover off and looked around... all looks well.

I have done everything short of trying another control head. I'd rather not mess with the good working one if I don't have to.

Is this a control head issue or something more? There is a possibility there could have been reversed polarity or a short (wires could have touched) to the radio when I was testing it prior to finding the correct power cable in my stash of equipment. Could this be the issue?

Please let me know!
 
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ffemt601

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Jul 15, 2009
Messages
159
Location
MS
uniden278 said:
There is a possibility there could have been reversed polarity or a short (wires could have touched) to the radio when I was testing it prior to finding the correct power cable in my stash of equipment. Could this be the issue?
Click to expand...

If it was working prior to him selling it to you then I would bet that is the case.
 
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N1GJB

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Sep 27, 2008
Messages
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Location
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I had the radio looked at by a tech and apparently the ribbon cable between the control head and chassis was in wrong (upside down/backwards/whatever). It was bench tested at this and up to specs for transmit and such. I took it home and tested it with my supply again with the same results. I'm working on the assumption that the power supply I am using isn't putting out enough amps to power this (a UHF), OR the ground is bad...
 
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N1GJB

Member
Joined
Sep 27, 2008
Messages
97
Location
Haverhill, MA
fineshot1 said:
Please explain what you did here.

Did you do the Pin 10 ignition +12V hookup or did you try
the Acc Conn pin 7 & 9 jumper trick?

Acc Conn pinout reference below.

http://batlabs.com/images/cdmacc.gif
Click to expand...

I attempted to jump 7 & 9 but I did not have the pinout in front of me... so I jumped the wrong pins I guess.

On a side note, the radio did power and function properly with an "alligator clip" lead grounding to the chassis of the radio on a tech's power supply, not to the power connector. Maybe the ground to the connector is bad...
 
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