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

 All Forums
 MCUmall Forums
 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 ST M27C4002 Fail Blank test

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

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

* HTML is OFF
* Forum Code is ON
Smilies
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
polynomial Posted - 03/11/2026 : 10:18:51
Question,

I'm wondering why my new ST M27C4002 chips (3 of them) fail a blank test at address 0 with 0x3d. All of the chips fail the blank test with the same error even after an hour under a UV light. Can read the chip data without issues though. I have had no issues with different types of ROMs, e.g., M27C256. My setup is a new GQ-4X4 (3/2026) burner with the chip in a new ADP-054 16 bit adapter (jumper on pins 1-2) and the selected device as a M27C4002. Tried different speed settings but always fails a blank test.

Any insight that people can offer is truly appreciated!

Poly
1   L A T E S T    R E P L I E S    (Newest First)
polynomial Posted - 03/11/2026 : 12:50:34
I figured it out and the EPROMs are fine! User error. The GQ-4x4 and the ADP-054 use 40 pin sockets for the 27C4002 EPROMs. The issue was that the ADP-054 Adapter only has 18 pins to connect to the GQ-4x4. This is hard to see because of the size of the adapter, but once I figured this out, I just needed to move the adapter down one position in the GQ-4x4 socket, and the EPROMs could be blank checked and written!

MCUmall EPROM BIOS Chip Burner Forum © Copyright 2003 - 2009 Mcumall Electronics Inc. Go To Top Of Page
Generated in 0.03 sec. Snitz Forums 2000