Comments on: TI-89 http://www.takeitapart.net/archives/ti-89/ Dissecting electronic gadgetry, just for fun. Fri, 21 Nov 2008 04:52:06 +0000 http://wordpress.org/?v=2.6.2 By: Brian http://www.takeitapart.net/archives/ti-89/#comment-30200 Brian Wed, 01 Oct 2008 00:16:23 +0000 http://www.takeitapart.net/archives/ti-89/#comment-30200 Appreciated the guide. It's always nice to see where things are connected to give you some confidence you aren't going to break anything. For reference, my calculator wasn't turning on reliably, but seemed fine once it was on. Replacing the backup battery didn't help. Cleaning the various contacts with rubbing alcohol seemed to do the trick for me. With regard to the questions from Denis, you can definitely clean more thoroughly if you remove the back cover, which does require removing the six back screws (Torx T6), but you may want to try cleaning without removing the back cover first. There is no solder connecting th batteries, but instead it seems the batteries connect at the gold patches visible in image 13/25. I cleaned those patches to be thorough. Appreciated the guide. It’s always nice to see where things are connected to give you some confidence you aren’t going to break anything.

For reference, my calculator wasn’t turning on reliably, but seemed fine once it was on. Replacing the backup battery didn’t help.

Cleaning the various contacts with rubbing alcohol seemed to do the trick for me. With regard to the questions from Denis, you can definitely clean more thoroughly if you remove the back cover, which does require removing the six back screws (Torx T6), but you may want to try cleaning without removing the back cover first. There is no solder connecting th batteries, but instead it seems the batteries connect at the gold patches visible in image 13/25. I cleaned those patches to be thorough.

]]> By: Denis http://www.takeitapart.net/archives/ti-89/#comment-25883 Denis Sat, 12 Jul 2008 22:00:40 +0000 http://www.takeitapart.net/archives/ti-89/#comment-25883 Hi, I am going to disassemble to fix the broken battery contact but I wonder , Do I have to unscrew the 4 screws on 4 corners of the cal , or just the 1 screw near the memory battery ? I saw a disassemble picture , is it true that the battery contacts arent connected to the circuit by solder points ( hard connect ) ? , since I can see all battery connects are attached to the bottom half , the circuit has only 2 bare square yellow contact . I dont see any solder there at all . Thank you so so much if you could help me out , Hi, I am going to disassemble to fix the broken battery contact but I wonder ,
Do I have to unscrew the 4 screws on 4 corners of the cal , or just the 1 screw near the memory battery ?
I saw a disassemble picture , is it true that the battery contacts arent connected to the circuit by solder points ( hard connect ) ? , since I can see all battery connects are attached to the bottom half , the circuit has only 2 bare square yellow contact . I dont see any solder there at all .

Thank you so so much if you could help me out ,

]]> By: Christopher http://www.takeitapart.net/archives/ti-89/#comment-19529 Christopher Sat, 29 Mar 2008 22:05:12 +0000 http://www.takeitapart.net/archives/ti-89/#comment-19529 Thanks for the guide! The fourth column of keys stopped working for me. This may have also been caused by corrosion, but upon opening my calculator, I didn't see any issues. Needless to say cleaning the key contacts with contact cleaner didn't solve anything. Any ideas as to why some of my keys just died? Thanks for the guide! The fourth column of keys stopped working for me. This may have also been caused by corrosion, but upon opening my calculator, I didn’t see any issues. Needless to say cleaning the key contacts with contact cleaner didn’t solve anything. Any ideas as to why some of my keys just died?

]]> By: Chris http://www.takeitapart.net/archives/ti-89/#comment-10414 Chris Sat, 30 Jun 2007 08:03:37 +0000 http://www.takeitapart.net/archives/ti-89/#comment-10414 Yes, it did work after reassembly. Fixing it so it would function was the initial reason for Taking It Apart. Batteries were left in it and corroded the terminals to the point where they were no longer conductive. Taking It Apart, some rubbing alcohol, and a little solder fixed it back up to working condition. :) Yes, it did work after reassembly. Fixing it so it would function was the initial reason for Taking It Apart. Batteries were left in it and corroded the terminals to the point where they were no longer conductive.

Taking It Apart, some rubbing alcohol, and a little solder fixed it back up to working condition. :)

]]> By: Christian http://www.takeitapart.net/archives/ti-89/#comment-9845 Christian Sun, 10 Jun 2007 06:06:41 +0000 http://www.takeitapart.net/archives/ti-89/#comment-9845 Did the calculator work after reassembly? I always wanted to put a back light for the screen in it. Is there any space left inside ? Did the calculator work after reassembly? I always wanted to put a back light for the screen in it. Is there any space left inside ?

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