ALLservice Service Forum
support board, PC repair, unlocking solutions
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

driven-i2cprog circuit problems

 
Post new topic   Reply to topic    Service Forum Forum Index -> IBM/Lenovo ThinkPad Password Help Center (EN)
View previous topic :: View next topic  
Author Message
wpsx
Nou Venit


Joined: 04 Nov 2022
Posts: 3

PostPosted: Fri Nov 04, 2022 6:24 pm    Post subject: driven-i2cprog circuit problems Reply with quote

Hello I created a circuit based on this site.
https://web.archive.org/web/20070312154157/http://www.rkawakami.net:80/ibm_600x/max232_if/

but When I ran itester, SDA in remained 0, SDA out and CTL went back and forth between 0 and 1 every 5 seconds. when invert selected, SDA in remined 1 and SDA out,CTL show same results.
It is circuit picture.
https://flic.kr/p/2nXeWx7

Are there any different parts of the circuit?  
Also, the serial port part is a kit soldered for breadboard.[/b]
Back to top
View user's profile Send private message
victor
S.F. Boss


Joined: 07 Mar 2004
Posts: 2562
Location: Staff

PostPosted: Fri Nov 04, 2022 7:16 pm    Post subject: Reply with quote

Hi,

The diodes look to be switched. So invert them, the cathode (black strip) should be towards the IC.
_________________
Victor Voinea
ALLservice HQ, Romania.
Back to top
View user's profile Send private message
wpsx
Nou Venit


Joined: 04 Nov 2022
Posts: 3

PostPosted: Mon Dec 12, 2022 2:17 am    Post subject: Reply with quote

It's been a while.
I made that's circuit again. but circuit didn't work.
https://flic.kr/p/2o5nYR7
Serial Port pinasign is

4 - red
5 - brown
7 -gray
8 - purple

The wires were aligned and checked with a tester to confirm that there was no problem.
and tester showed SDA=3.34V SCL=3.76V,MAX232EN Too Hot.
Back to top
View user's profile Send private message
victor
S.F. Boss


Joined: 07 Mar 2004
Posts: 2562
Location: Staff

PostPosted: Mon Dec 12, 2022 1:11 pm    Post subject: Reply with quote

I told already you the diodes are not sensed correctly.

I give up.
_________________
Victor Voinea
ALLservice HQ, Romania.
Back to top
View user's profile Send private message
wpsx
Nou Venit


Joined: 04 Nov 2022
Posts: 3

PostPosted: Mon Dec 12, 2022 4:53 pm    Post subject: Reply with quote

Sorry previous picture is hard to see.
I think black strip cathode towards the IC. is it wrong?
https://flic.kr/p/2o5tdb4
Back to top
View user's profile Send private message
bob
S.F. Moderator


Joined: 07 Mar 2004
Posts: 798
Location: Staff

PostPosted: Mon Dec 12, 2022 5:16 pm    Post subject: Reply with quote

You know, we have those interfaces for sale, professionally built with 3.3V RS drivers and all. You should buy one It's just 45 Euro with shipping included worldwide and you will also support us by doing that.

Just send the payment via Paypal to support@allservice.ro, specify driven-i2c interface and email us a confirmation via email (this form actually https://www.allservice.ro/forum/dl/order-i.doc ).
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Service Forum Forum Index -> IBM/Lenovo ThinkPad Password Help Center (EN) All times are GMT + 2 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Powered by phpBB © 2001, 2005 phpBB Group