GP300 Weird Problem... Help

MotoMax300 · Post by **MotoMax300** » Fri Oct 13, 2006 8:51 pm

Never had this happen, I have a GP300 that was in use here, was receiving a tone from dispatch, (not set to decode them), then the radio went to Open Squelch (static), wouldnt change channels or hear anything, I thought the battery died, put a new one on it, wouldnt power on, pulled a battery off the conditioner (fully charged) wouldnt power on...

Opened the radio, fuse fine, all contacts fine, Volume / Power switch fine.... any ideas????

MotoMax300 · Post by **MotoMax300** » Fri Oct 13, 2006 8:58 pm

It was not in a charger when this happened.

Al · Post by Al » Sat Oct 14, 2006 11:21 am

Well, since the squelch circuit is controlled by the AFIC chip that's controlled in turn by the uP, and the synthesizer chip is controlled by the uP, the first place I would check if there's no powerup self test beep is the uP crystal, the 7.9488 Mhz clock on the uP pins 31 and 33

MotoMax300 · Post by **MotoMax300** » Sat Oct 14, 2006 1:12 pm

Checked that, confirms good..... heh.....

Al · Post by Al » Sat Oct 14, 2006 6:16 pm

Did you also check the reset pin on the uP to be sure that on powerup nothing's holding the uP at reset and keeping it from booting up?

MotoMax300 · Post by **MotoMax300** » Sat Oct 14, 2006 6:51 pm

yep, it's beyond that somewhere.....