909 mods

[Fraser, Colin J]

> -----Original Message-----
> From: david leigh [mailto:dave909 at hotmail.com]
> Sent: 17 December 1999 03:45
> To: synth-diy at mailhost.bpa.nl
> Subject: 909 mods
> 
> Purchased a 909 yesterday(cheap). The guy who sold it had a 
> mod done, which 
> is in the form of a switch. You flick the power, then flick 
> this switch. My 
> guess is that the switch turns the cpu on, after the machine 
> is powered up. 
> If this guess is right, I will replace the switch with a 
> timer to delay 
> power to the cpu.

> Does anyone know the differences b/w production runs? This 
> probably won't 
> help as the serial plate has been removed.

There was a change made in the power supply circuit to improve reliability
in the digital circuits.
Replace D701 with RD6.8JB2, instead of RD5.6JB2.


Colin f