Yes - The main CPU is operating and producing signals as it should on the oscilloscope with the PSU at the power pin.Everything works - including the backbone connector between the circuit boards. There is just no LED response and a weak output from the MIDI socket.
The processor seems to be producing MIDI ok and producing the LED signals from the addressing pins.
To me it looks like the MIDI output stage tranny is not doing its job - and something is either wrong with the LED power source (which is separate from the analogue and digital sources) or the whole LED driver stage has failed (which does not seem likely). I am pretty certain there is a working AZ in there waiting to come back to life.
The processor seems to be producing MIDI ok and producing the LED signals from the addressing pins.
To me it looks like the MIDI output stage tranny is not doing its job - and something is either wrong with the LED power source (which is separate from the analogue and digital sources) or the whole LED driver stage has failed (which does not seem likely). I am pretty certain there is a working AZ in there waiting to come back to life.
From: "Gordonjcp gordon@... [CZsynth]"
To: "Lee Borrell templarser@... [CZsynth]" ;
Sent: Sunday, 25 October 2015, 21:32
Subject: Re: [CZsynth] AZ1 repair
To: "Lee Borrell templarser@... [CZsynth]" ;
Sent: Sunday, 25 October 2015, 21:32
Subject: Re: [CZsynth] AZ1 repair
On Sun, Oct 25, 2015 at 08:59:46PM +0000, Lee Borrell templarser@... [CZsynth] wrote:
> It seems the machine is operational ,but just not indicating what it is doing,or producing MIDI strong enough to be noted AS a midi signal.Indeed I read on a forum that someone else had an AZ1 with power light on and producing MIDI but not showing any LED action. It is suggestive of the LED power or ribbon cable being at fault.
Have you checked the power supply, starting at the power socket and working your way in?
--
Gordonjcp MM0YEQ
> It seems the machine is operational ,but just not indicating what it is doing,or producing MIDI strong enough to be noted AS a midi signal.Indeed I read on a forum that someone else had an AZ1 with power light on and producing MIDI but not showing any LED action. It is suggestive of the LED power or ribbon cable being at fault.
Have you checked the power supply, starting at the power socket and working your way in?
--
Gordonjcp MM0YEQ