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HP21 problem
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12-18-2014, 11:56 AM
Post: #4
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RE: HP21 problem
Before putting it in the non-working drawer I would take it apart and re-seat the LED display to the main board and the main board to the keyboard. There is a very good chance this will get it working again. The ROM chip in the 21 is tied in with the LED anode drivers, so if it still doesn't work it's probably a bad ACT chip.
-Mark- |
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| Messages In This Thread |
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HP21 problem - vk6ti - 12-17-2014, 05:26 AM
RE: HP21 problem - Katie Wasserman - 12-17-2014, 02:57 PM
RE: HP21 problem - PANAMATIK - 12-18-2014, 08:28 AM
RE: HP21 problem - MarkPalmer - 12-18-2014 11:56 AM
RE: HP21 problem - PANAMATIK - 12-19-2014, 04:19 PM
RE: HP21 problem - MarkPalmer - 12-18-2014, 04:09 PM
RE: HP21 problem - aj04062 - 12-18-2014, 04:24 PM
RE: HP21 problem - PANAMATIK - 12-18-2014, 05:55 PM
RE: HP21 problem - vk6ti - 12-19-2014, 12:07 AM
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