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CDM1550 LS+ Acting Goofy

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SCPD

QRT
Joined
Feb 24, 2001
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Location
Virginia
Powered it up tonight and tuned to a known conventional channel but no audio from the speaker. The alert tones an key press tones are coming through the front speaker, even responds to volume changes. I used this radio about a month ago and put it aside for another project. Reads/writes code plugs just fine and no issues with the display. Any ideas where to look to figure out where to look. I was thinking of getting the breakout pin connector for the rear port and see if the discriminator audio is coming out.

One test I can't do is a transmit test as this radio was bascially a receiver anyway. Any help would be appreciated.
 

PACNWDude

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Oct 15, 2012
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2 of mine did that too.

I have two of the older CDM1550LS+ that did the same thing when I had them stacked and used as base station radios. These are the 16 channels versions. Mine would do that if they were powered down and not connected to a constant power source for a few months. I would re-load the codeplug and then they worked fine again.

I ended up mounting them in my truck, and they have not given me any problems. (They are drawing a little voltage to keep their memory.)

This also happened to some Vertex VX-4200's after Motorola bought the company as well.
 

SCPD

QRT
Joined
Feb 24, 2001
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0
Location
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I figured out the problem. Swapped the "bad" control head into a working radio and it worked fine. The bad one had a good flex cable. The was a group of wires that looped out of the internal chassis and back. One wire was soldered to a pin in the head. For the heck of it re-soldered it back since I could see this IC pin where a wire was soldered and it works great. So I wonder one radio just uses the flex cable between the head and internals of the radio and why is a wire soldered to the head of the other one. That wire over time became loose and finally broke off where it was soldered to.

I was planning on using a remote head but that soldered wire would most likely not work because of it.
 
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