The following warnings occurred:
Warning [2] Undefined array key 98356 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 98395 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 98401 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 98464 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 98491 - Line: 275 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 275 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $thread - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $fid - Line: 295 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 295 errorHandler->error_callback
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined array key 98491 - Line: 331 - File: inc/plugins/threaded_mode.php PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php 331 errorHandler->error_callback
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 332 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 304 ThreadedMode::buildtree
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $theme - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $theme - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Trying to access array offset on value of type null - Line: 3 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 3 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Undefined variable $lang - Line: 5 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 5 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks
Warning [2] Attempt to read property "messages_in_thread" on null - Line: 5 - File: inc/plugins/threaded_mode.php(305) : eval()'d code PHP 8.1.2-1ubuntu2.14 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/inc/plugins/threaded_mode.php(305) : eval()'d code 5 errorHandler->error_callback
/inc/plugins/threaded_mode.php 305 eval
/inc/plugins/threaded_mode.php 23 ThreadedMode::showthread_threaded
/inc/class_plugins.php 142 threaded_mode_showthread_threaded
/showthread.php 918 pluginSystem->run_hooks





Minor Calcuator Repair/HP 41CV/HP 12C



#6

I have an old HP 41CV that I have had since college (vintage 1984). When I checked recently, there was a fair amount of corrosion on the contacts at both ends of one of the batteries. Strangely, I don't see anything leaking from the battery. I can't recall the last time I changed batteries - it might have been 6 or 8 years ago. Everything still works.

What is the best way to clean the contacts? Alcohol and a cotton swab?

Also, I've picked up an older made in the USA vintage 12C. I've not received it yet - but from the pictures it looks like 1 of the 4 rubber feet are missing. I'm not overly picky about these things. Any chance I could find something reasonable at a hardware store to replace these feet? I'm thinking I might replace the 2 on that side so that the thing rests firmly.

Finally, what's the best place to get replacement batteries for the HP41CV and 12C. I think I went to Radio Shack last time - they seem to be a bit expensive. Can you get these batteries from Amazon or other online places?

Thanks,

Kevin


#7

Quote:
What is the best way to clean the contacts? Alcohol and a cotton swab?

Is there corrosion on the contact(s) in the calculator? Assuming the answer is yes and it's the typical blue-green looking crud, I'm not sure that alcohol is the best cleaner. Good old water will probably do the trick, using a damp soft cloth so as not to get any free liquid loose in the calculator. When you get as much crud as possible off, try to polish the contact(s) with a pencil eraser (the soft white kind if available). These contacts are very thin, so anything more aggressive (e.g. sandpaper) risks damage that you don't want to have to deal with. The cleaning process would likely be easier if you disassembled the calculator. The battery contact-I/O block comes out rather easily once you remove the back. However, the screw posts on the 41 series are notoriously weak, so remove and reinstall the screws with extreme care. Maybe best to disassemble only if the first cleaning method doesn't produce adequate results.

Quote:
I've picked up an older made in the USA vintage 12C...Any chance I could find something reasonable at a hardware store to replace these feet?
Well it’s not a hardware store and you’ll have to buy 10 lifetime supplies of foot-replacement material, but part no. 8635K26 from this supplier was identified somewhere/sometime as a good material for this purpose.

Quote:
Finally, what's the best place to get replacement batteries...
You might take a look here and here. I have purchased from the Battery Station, service was fine. I don’t know if I ever bought from the other source.


The above advice is thought to be reasonable, but follow at your own risk. Good luck with your repairs.

#8

Thanks!


#9

Kevin,
Circuit City sells Coppertop N cells for $2 a pair.


#10

Thanks - yea - they're not as rare as I thought. That would save shipping from an internet store.


Possibly Related Threads…
Thread Author Replies Views Last Post
  Strange HP 25 Problem (Repair) Onur Ilkorur 5 2,800 12-06-2013, 05:13 PM
Last Post: Onur Ilkorur
  HP 41CV Repairs William Mabotja 3 1,569 11-20-2013, 04:45 PM
Last Post: Mike Powell
  Another minor Prime hexagesimal issue Jonathan Cameron 1 1,328 11-08-2013, 02:37 PM
Last Post: Michael de Estrada
  "Packing" syndrome of my HP-41CV PGILLET 12 3,358 11-03-2013, 02:46 PM
Last Post: Hans Holzach
  opening hp 15c for repair FORTIN Pascal 4 1,958 10-12-2013, 10:35 AM
Last Post: FORTIN Pascal
  HP-42S repair of unresponsive keyboard Tom Grydeland 1 1,152 10-08-2013, 07:04 PM
Last Post: aj04062
  HP-67 keyboard repair davorin 1 1,157 10-04-2013, 04:09 AM
Last Post: Katie Wasserman
  minor visual bug in INPUT Han 0 941 10-03-2013, 01:13 PM
Last Post: Han
  Minor suggestions for next edition of WP-34S manual Marcel Samek 4 1,726 08-21-2013, 01:30 AM
Last Post: Walter B
  HP-67 Card Reader Repair Question aj04062 1 1,483 08-08-2013, 11:15 AM
Last Post: Randy

Forum Jump: