I have a CDM 1250 UHF and the speaker does not work. Radio still powers on and keys up fine but can’t hear anything out of the speaker. Even tried plugging in an external speaker and still can’t hear. Is there something that I can check that may be wrong or is the entire radio shot?
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CDM 1250
- Thread starter lnicholls104
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wgbecks
Active Member
It's possible the audio amplifier is blown. That said, are you sure the receiver is unmuting? Is the external speaker wired to Pin's 1 (-) and 16 (+)?
Be advised that low level audio is available on Pin 11 referenced to ground on Pin 7. This output is independent of the internal speaker amplifier,
will not directly drive a speaker, and is not controlled by the volume control, but does proivde a way to check that the receiver is working and can be used to drive an external amplified speaker.
Be advised that low level audio is available on Pin 11 referenced to ground on Pin 7. This output is independent of the internal speaker amplifier,
will not directly drive a speaker, and is not controlled by the volume control, but does proivde a way to check that the receiver is working and can be used to drive an external amplified speaker.
petnrdx
Member
OFTEN I have seen where someone unplugged the internal speaker inside the radio. Might pry it open and check for that.
WE would unplug the speaker when using the external on the 16 pin plug. Especially in ambulances as most had a toggle switch to shut off the speaker after doing clearance with hospital.
petnrdx
Member
Exactly.
mmckenna
I ♥ Ø
Do you hear power up tones or keypad press tones?
If you do, it's probably a programming issue.
If the front speaker is plugged in, or you are using the correct pins off the rear 20 pin connector, and still no audio, it's probably something that gave up the fight inside. These are old radios and failures are not unheard of (no pun intended).
There are service manuals online with troubleshooting flow charts, but unless you have the tools, test equipment and eyesight to do that sort of work, it would be cheaper to just buy a replacement radio. They are not expensive if you shop around.
I realize this is an old thread but I'm having a similar issue with a CDM1550 I purchased so I'm looking for some guidance.
Radio programs fine and will transmit fine (listening on another radio) but there is no audio out of the front speaker. No beeps at startup, button presses, and no audio when receiving traffic.
I popped the front panel off and it appears the speaker is connected.
What else can I check?
There's no way in the software to disable the speaker, is there? I shot a codeplug that I had for another 1550 into it but I guess a setting may 'stick' from previous settings...maybe?
Anyway, guidance is appreciated. Figured I'd just add to this thread instead of starting a new one since the issue is the same.
Was an eBay purchase (good price) and the listing said "fully working" but I don't know what testing they did. Before I send them a message I'm seeing if there's something I'm missing...
Radio programs fine and will transmit fine (listening on another radio) but there is no audio out of the front speaker. No beeps at startup, button presses, and no audio when receiving traffic.
I popped the front panel off and it appears the speaker is connected.
What else can I check?
There's no way in the software to disable the speaker, is there? I shot a codeplug that I had for another 1550 into it but I guess a setting may 'stick' from previous settings...maybe?
Anyway, guidance is appreciated. Figured I'd just add to this thread instead of starting a new one since the issue is the same.
Was an eBay purchase (good price) and the listing said "fully working" but I don't know what testing they did. Before I send them a message I'm seeing if there's something I'm missing...
Project25_MASTR
TX-COMU
Did you check an external speaker?
Nope, don't have a Moto speaker to connect to it right now...I meant to put that in my other comment...
Given what you said in post #7 it's more than likely a blown audio amp. I had an XPR 4550 that unintentionally got a speaker lead grounded. I'm sure the CDMs also use the same type audio amp. Cost me a $100.00 to learn that lesson. Somewhere in Motorola manuals it says DO NOT ground the speaker leads.
I would check with the seller to see what the return options are.
I would check with the seller to see what the return options are.
Am planning to reach out to them if there is no "ah ha" moment from suggestions here. Sounds like my best option at this point...but I do have a speaker on the way that will connect to the 16 pin connector and see if it will work that way.
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mmckenna
I ♥ Ø
Yeah, it's a BTL audio amp, and grounding one of the speaker leads will blow it out.
CDM's are all over the place, and finding a good one shouldn't be much of a challenge. I've sold off several I had in the last few months. I'd send it back and get a refund and spin the wheel again. It's not something you can fix easily on your own.
Yeah, I won't try to repair it if it won't work with an external speaker. I have a few others CDMs (1250 and 1550). I did check their eBay listings and they have it set as 'no returns' but then in the description they say "if there are any issues, reach out to us first so we can make it right" so I'll shoot a message and see what they say.
Follow-up - eBay seller responded and said they have a few other 1550s on-hand so they're going to send me another to try with a return label for the first one. So, sorry to 'hijack' the thread here but I was hoping maybe it was just a setting or a disconnected cable somewhere but it seems more complex than that. Thanks all!
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