Yamaha Electronic Keyboard Dx7 Ii D Users Manual Upgrade Your

Electronic-Keyboard-Dx7-Ii-D-Users-Manual yamaha-electronic-keyboard-dx7-ii-d-users-manual-134508

DX7 II-D to the manual f67f743c-c272-42fc-b903-0cdb8b44f170

2014-12-13

: Yamaha Electronic-Keyboard-Dx7-Ii-D-Users-Manual yamaha-electronic-keyboard-dx7-ii-d-users-manual-134508 pdf

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Upgrade your Yamaha DX7 II-D to Yamaha DX7 II-FD February 2009 By CloudsWalker www.cloudswalker.com Missing Parts on the Yamaha DX7 II-D : IC5 Integrated Circuit 16 pin DIL : TC40H174P 6 x D-Flip-flop, can be replaced by 74HC174 IC6 Integrated Circuit 14 pin DIL : 7405 (TTL) IC22 Integrated Circuit 28 Pin DIL : HM65256BLP12 SRAM, can be replaced by HM62256LP12 or equivalent IC23 EPROM 27512 or 27C512 for the new Operating System IC24 Integrated Circuit 28 Pin DIL : WD1772-PH (1986) Western Digital Floppy Disk Controller !!! 3,5 inch Floppy Disk with Drive Select 0 !!! CN1 34 pin Floppy Disk Male Connector 34 pin flat cable between Main Board and Floppy Disk Power cable between Power Supply Board and Floppy Disk Parts collecting : 74HC174 is easy to found and found also one IC socket 16 pin DIL 7405 is easy to found and found also one IC socket 14 pin DIL HM62256LP12 or equivalent is relatively easy to found and found also one IC socket 28 pin EPROM 27C512 is relatively easy to found and found also one IC socket 28 pin DIL WD1772 can by found on the Web … or removed from one Atari ST !!! + IC socket 28 pin The floppy Disk can be 1.44Mb/720kb new … BUT with Drive Select 0 Battery replacement : It will be judicious at this Time to change your Backup Battery ( 3V CR2032 ) It’s better to solder a socket. This socket can be removed from an old PC Mother Board Procedure :
I’ve open my Yamaha DX7 II-FD and we can see a soldered Battery I’ve remove the EPROM with Operating System

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