1810-0146 replacement
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03-17-2022, 07:47 PM
Post: #1
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1810-0146 replacement
Hello! I recently acquired an HP-55. After some cleanup and TLC, reassembly, and a new battery pack it's working pretty well now, except for one issue - no decimal points will illuminate. All other display aspects are fine; the segments & digits are all well behaved. I did some reading up (ClassicNotes.PDF) and suspect the root cause is an open coil in the 1810-0146 quad coil pack. All of the coils are low ohms to common except for the decimal point coil.
Other than taking a 1810-0146 from a 'donor' calculator, two solutions come to mind: 1) solder a small fixed 68uH inductor across the open coil in the pack, or 2) make a replacement "pack" from four small fixed inductors (1x 68uH, 3x 130uH) Has anyone else faced this issue? I'd love to hear how you solved it. -tom |
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Messages In This Thread |
1810-0146 replacement - tomcircuit - 03-17-2022 07:47 PM
RE: 1810-0146 replacement - teenix - 03-18-2022, 12:16 AM
RE: 1810-0146 replacement - tomcircuit - 03-18-2022, 01:40 AM
RE: 1810-0146 replacement - tomcircuit - 03-24-2022, 06:34 PM
RE: 1810-0146 replacement - teenix - 03-24-2022, 07:39 PM
RE: 1810-0146 replacement - tomcircuit - 03-24-2022, 09:45 PM
RE: 1810-0146 replacement - teenix - 03-25-2022, 02:34 AM
RE: 1810-0146 replacement - tomcircuit - 03-25-2022, 02:53 AM
RE: 1810-0146 replacement - teenix - 03-25-2022, 02:35 PM
RE: 1810-0146 replacement - tomcircuit - 03-26-2022, 01:46 AM
RE: 1810-0146 replacement - tomcircuit - 03-26-2022, 02:18 PM
RE: 1810-0146 replacement - Dreato - 03-29-2022, 04:05 PM
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