cdm 1250 will not turn on

FF/EMT/KC2NFB · Post by **FF/EMT/KC2NFB** » Sat Feb 04, 2006 11:30 am

need some help with a cdm 1250.

i have power and the igniton sense all correct but cant seem to get the unit to turn on.

HLA · Post by **HLA** » Sun Feb 05, 2006 1:55 am

are you positive you have the right pin for the ingition?

FF/EMT/KC2NFB · Post by **FF/EMT/KC2NFB** » Sun Feb 05, 2006 7:03 am

yes im sure. this thing is driving me crazy. i know there are a 2 voltage regulators on the board and they are puting out the proper voltages. does anyone know if there is a small surface mount fuse on the board somewhere?

jackhackett · Post by **jackhackett** » Sun Feb 05, 2006 9:24 am

No, there is no fuse. What you're seeing is probably the new POS feature Moto has been putting into their radios.
From what I understand they use a 16.8MHz reference oscillator with a MTBF of about 2 weeks and they added special circuitry to the radio that senses when it craps out and instead of giving a fail code so you can have a clue what's going on it just stops the radio from powering up at all.

it was discussed here a while ago
http://batboard.batlabs.com/viewtopic.php?t=44962

FF/EMT/KC2NFB · Post by **FF/EMT/KC2NFB** » Sun Feb 05, 2006 9:58 am

ok thanks. ill try and tinker with it and see what i can do. if i figure it out ill post it. if anyone else has anything on this it would great.

smile@2006 · Post by **smile@2006** » Sun Feb 05, 2006 11:34 pm

Inject +5Volt DC to IGNITION SENSE pin.
Then turn on the radio.

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thebigphish · Post by **thebigphish** » Mon Feb 06, 2006 12:11 am

jackhackett wrote:No, there is no fuse. What you're seeing is probably the new POS feature Moto has been putting into their radios.
From what I understand they use a 16.8MHz reference oscillator with a MTBF of about 2 weeks

talk about planned obselecence! hahahah

jackhackett · Post by **jackhackett** » Mon Feb 06, 2006 6:31 am

smile@2006 wrote:Inject +5Volt DC to IGNITION SENSE pin.
Then turn on the radio.

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:D :D :D

I've got a dead one sitting here right now (see, it is a pervasive problem), I tried this not really expecting it to work and guess what? Nada. Zilch. Nuttin.
Would you care to elaborate on where this idea comes from and how exactly it's supposed to work?

jim · Post by **jim** » Mon Feb 06, 2006 6:54 am

"Inject +5Volt DC to IGNITION SENSE pin.
Then turn on the radio. "

Um....huh??

FF/EMT/KC2NFB · Post by **FF/EMT/KC2NFB** » Mon Feb 06, 2006 1:59 pm

yeh guys. thats what im saying. um huh 5+? if i have 12+ going to the sense pin which is whats supposed to go there what is 5+ going to for me?

smile@2006 · Post by **smile@2006** » Tue Feb 07, 2006 8:13 pm

For safety, use +5Volt DC.
If use +12Volt DC you must becarefull...!!!

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Use Positif Regulator IC type 7805 or 78L05 to convert +5V.
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jim · Post by **jim** » Tue Feb 07, 2006 8:16 pm

BTW, crack is illegal in the US.

FF/EMT/KC2NFB · Post by **FF/EMT/KC2NFB** » Tue Feb 07, 2006 8:36 pm

yeh ditto.

Post by **wavetar** » Wed Feb 08, 2006 10:33 am

Uh huh. Yes, almost guaranteed it's the reference oscillator, which Motorola doesn't make available to MMS repair shops. Hello depot.

Todd

thebigphish · Post by **thebigphish** » Wed Feb 08, 2006 11:51 am

smile@2006 wrote:Inject +5Volt DC to IGNITION SENSE pin.
Then turn on the radio.

hello susan157/raymond359!

Post by **wavetar** » Wed Feb 08, 2006 12:12 pm

Ok, good enough. If you get it fixed, let us know in a new thread.

Todd