HAWK-800 Constructions and Installations Instructions –
Reverting Back to Original Operation
NOTE: The procedure below only applies to the original Poly-800 (PS-800) and the EX-800. The procedure for reverting the
MK2 (PS-800II) is not included here. If you need assistance with a MK2, contact
If it is necessary to revert your Poly-800 or EX-800 synth back to original operation then follow the instructions below:
1. Power off your synthesizer and disconnect the power. Then open up the synth.
2. Remove all of the HAWK components.
3. Unscrew and remove the main board and then remove the "Write" jumper from the back of the main board.
4. Replace IC29 (40HC138/74HC138). You can use the original IC29 or use one from the HAWK board.
5. Replace the original EPROM into the EPROM socket.
6. Close up your synthesizer and test it.
https://sourceforge.net/p/hawk800/
Copyright Wantegrity Inc All Rights Reserved
http://www.wantegrity.com
Document Version 1.01d – Published October 6
th
, 2018
<END>
29 Of 29
