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HP-97 sudden death
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12-26-2014, 07:25 PM
Post: #1
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HP-97 sudden death
Hello everyone,
I have an HP-97 on which I fixed the card reader and printer and rebuilt the battery pack. For some time all worked fine, then one day after a charge cycle the machine did not respond anymore. Battery voltage is fine. I also checked the inverter, Vss and Vgg are OK (6.25 / -12.2 V). The calculator draws ~350 mA (~140 without the printer board) but there is no display and no visible digital activity (no Phi 1/2 clock, strobe or other signals). Reset to the ACT chip is OK. Does anyone have any other ideas or do I have to assume the ACT is dead? Thanks in advance! --WD |
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HP-97 sudden death - wine+dine - 12-26-2014 07:25 PM
RE: HP-97 sudden death - PANAMATIK - 12-27-2014, 12:52 AM
RE: HP-97 sudden death - Katie Wasserman - 12-27-2014, 01:29 AM
RE: HP-97 sudden death - wine+dine - 12-27-2014, 01:21 PM
RE: HP-97 sudden death - PANAMATIK - 12-27-2014, 07:25 PM
RE: HP-97 sudden death - wine+dine - 12-27-2014, 08:30 PM
RE: HP-97 sudden death - PANAMATIK - 12-27-2014, 09:55 PM
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