MaraTrac beeps

arlojanis · Post by **arlojanis** » Tue Dec 27, 2005 6:50 am

I have a VHF MaraTrac that when turned on, has no display, gives 4 series of 3 short beeps, then a long tone and display shows A1, then silent and no functions. Whats causing this?

motorola_otaku · Post by **motorola_otaku** » Tue Dec 27, 2005 8:01 am

It might be set up to use a clamshell control head. Use the head-less powerup trick described in the Batlabs Maratrac page, then read the radio, go into the Control Head option under F2 - Service and see what it's programmed for. You can change it to use the A7 head there.

arlojanis · Post by **arlojanis** » Tue Dec 27, 2005 9:53 am

That's not the problem. Radio worked good for several years and just developed this problem.

Post by **xmo** » Tue Dec 27, 2005 1:13 pm

Error tone chart says 3 beeps = external EEPROM error.

Try re-programming the radio from a saved codeplug.

You might also look at your logic board. Some logic boards had a Dallas memory chip. These contain a battery and are old enough that some are starting to die. You can replace that chip with a 2816 EEPROM.

arlojanis · Post by **arlojanis** » Tue Dec 27, 2005 2:23 pm

If I read the radio it says copyright info corrupted. If I try to clone, it says model number mismatch. The prom I think is 27XX could have been 28XX. I set in another radio and it worked OK. So problem is inside radio.

Will · Post by **Will** » Tue Dec 27, 2005 3:00 pm

I may be 'out back' on this one, but have seen a bad DATA line transistor in Maxtrac type Logic boards do the same sort of thing. I look at the DATA line on a scope while trying to READ or PGM. Looking for good square data pulses. With a bad DATA line in the radio, the DATA signal looks all 'mushy'.

arlojanis · Post by **arlojanis** » Thu Jan 05, 2006 6:18 am

It was a bad 2K X 8 eeprom.