MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Save Password
Forgot your Password?

 All Forums
 MCUmall Forums
 Open Source Project Willem Programmer Hardware
 Dual power won't program 27SF512s (anymore)

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Format Mode:
Format: BoldItalicizedUnderlineStrikethrough Align LeftCenteredAlign Right Horizontal Rule Insert HyperlinkInsert EmailInsert Image Insert CodeInsert QuoteInsert List Spell Checker

* Forum Code is ON
Smile [:)] Big Smile [:D] Cool [8D] Blush [:I]
Tongue [:P] Evil [):] Wink [;)] Clown [:o)]
Black Eye [B)] Eight Ball [8] Frown [:(] Shy [8)]
Shocked [:0] Angry [:(!] Dead [xx(] Sleepy [|)]
Kisses [:X] Approve [^] Disapprove [V] Question [?]

   Insert an Image File
Check here to include your profile signature.

T O P I C    R E V I E W
rybowen Posted - 11/07/2005 : 13:47:52
My dual power worked flawlessly for the first couple of weeks I've had it, but now it won't erase or program SST 27SF512 chips - even brand new chips, or ones that I programmed with it last week.

The harware checks out with one exception; Pin 1 = Vpp (12.55v), Vcc= 4.98v and the rest are 4.33v.

BUT, Pin 26 is 2.85v.

Is that normal?

It reads and writes 29c256 chips perfectly. I wish I knew what was going on here.
1   L A T E S T    R E P L I E S    (Newest First)
rybowen Posted - 11/07/2005 : 14:41:06
Found the problem:

Broken DIP switch position 7....

MCUmall EPROM BIOS Chip Burner Forum © Copyright 2003 - 2009 Mcumall Electronics Inc. Go To Top Of Page
Generated in 0.06 sec. Snitz Forums 2000