The following warnings occurred:
Warning [2] count(): Parameter must be an array or an object that implements Countable - Line: 795 - File: showthread.php PHP 7.4.33 (FreeBSD)
File Line Function
/showthread.php 795 errorHandler->error




HP Forums / HP Calculators (and very old HP Computers) / General Forum v / hp28s need repair ?. Autotest fails

Post Reply 
hp28s need repair ?. Autotest fails
01-01-2024, 03:22 PM (This post was last modified: 02-01-2024 05:44 PM by tlfrance.)
Post: #1
tlfrance Offline
Junior Member
 		Posts: 7
Joined: Dec 2023
hp28s need repair ?. Autotest fails
Hello guys,

I encounter some issues on my HP28S calc. Batteries are new *

1/ On autotest mode, result is : "2 FAIL"
2/ The screen do reset (clear) after i enter more than 2 or 3 lines in the stack
3/ when trying to plot sin(x) for ex, just 2 first dots begin plotting then cacl seems to be freezed. Must interrupt process whith "ON + UP"

Maybe issue can be the RAM chip , but not sure. What do you think about ?

Thanks for help.
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
hp28s need repair ?. Autotest fails - tlfrance - 01-01-2024 03:22 PM



User(s) browsing this thread: 2 Guest(s)

Contact Us | The Museum of HP Calculators | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication