This is a ti89 that was donated from a friend which didn't work due to corrosion... from both battery sets ( AAA and backup battery...
There was a lot of corrosion near the battery terminals and a lot of cleaning brought the calculator to life... partially because the backup battery circuit did not work, so unfortunally only using AAA. Now it looks like this:
- Images:
https://drive.google.com/file/d/1uwpA7YS9kDJwhIK9VCFDnI5MtI6xYrar/view?usp=sharing
https://drive.google.com/file/d/1nfCk5XjOZsp9RhxdAKM2bzBRNEJQx6DZ/view?usp=sharing
https://drive.google.com/file/d/1tAfceHPRHhOaKOxdtOvQYEv1sKqDEHyn/view?usp=sharing
Recently the calculator was "eating" more batteries than usual and so it was openend again for repairs... Both capacitors C11 and C18 read bad value capacitance (less than 1uF), none related to the marking and C18 has a resistance of 20KOhm and dropping.
Questions:
- Can C11 and C18 be replaced with tantalum capacitors?
- What does it mean its marking , eg C18 100 25n corresponds to 100uF 25v?
There was a lot of corrosion near the battery terminals and a lot of cleaning brought the calculator to life... partially because the backup battery circuit did not work, so unfortunally only using AAA. Now it looks like this:
- Images:
https://drive.google.com/file/d/1uwpA7YS9kDJwhIK9VCFDnI5MtI6xYrar/view?usp=sharing
https://drive.google.com/file/d/1nfCk5XjOZsp9RhxdAKM2bzBRNEJQx6DZ/view?usp=sharing
https://drive.google.com/file/d/1tAfceHPRHhOaKOxdtOvQYEv1sKqDEHyn/view?usp=sharing
Recently the calculator was "eating" more batteries than usual and so it was openend again for repairs... Both capacitors C11 and C18 read bad value capacitance (less than 1uF), none related to the marking and C18 has a resistance of 20KOhm and dropping.
Questions:
- Can C11 and C18 be replaced with tantalum capacitors?
- What does it mean its marking , eg C18 100 25n corresponds to 100uF 25v?