GM1200E won't turn on fault
Posted: Sun Nov 20, 2011 11:14 pm
Hi All
I have at least 8 x GM1200E with what appears to be the same fault. No turn-on, nothing on display, no tones. Looking at the uP reset line TP with a scope I can see regular pulses at about 50 mS. The service manual has this as being shorted address lines in the uP , RAM, ROM, etc but at 20 mS rate.
Has anyone else seen this fault please?
I'm hoping it is not hardware and can be fixed with flashing the firmware. If so I need the flash software, firmware and how to please?
Having so many fail the same way seems unusual so any thoughts, comments, etc would be appreciated.
Bill
I have at least 8 x GM1200E with what appears to be the same fault. No turn-on, nothing on display, no tones. Looking at the uP reset line TP with a scope I can see regular pulses at about 50 mS. The service manual has this as being shorted address lines in the uP , RAM, ROM, etc but at 20 mS rate.
Has anyone else seen this fault please?
I'm hoping it is not hardware and can be fixed with flashing the firmware. If so I need the flash software, firmware and how to please?
Having so many fail the same way seems unusual so any thoughts, comments, etc would be appreciated.
Bill