hp_9845
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hp_9845 [2018/09/10 13:15] cic |
hp_9845 [2018/09/11 03:03] cic |
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| [[:9845c-1742a00127|9845C-1742A00127]] | [[:9845c-1742a00127|9845C-1742A00127]] | ||
| - | These three machines were received in a group as a donation from the Eventide Corporation and were used by them as scientific calculators, process controllers and laboratory test beds for their products, including a line of memory products and HPIB multiplexors. Parts seem to have been swapped among the machines at different times. When I received them, the 9845C had the proper Option 200 power supply but the 9845T had an Option 100 power supply, underpowered for that configuration, and the 9845B lacked a power supply altogether. The only monitor received with the group was a 98780 enhanced monochrome display for the 9845T. | + | These three machines were received in a group as a donation from the [[https://www.eventideaudio.com/about/history/|Eventide Corporation]] |
| + | and had been used by them as scientific calculators, process controllers and laboratory test beds for their products, including a line of memory products and HPIB multiplexors. Parts seem to have been swapped among the machines at different times. When I received them, the 9845C had the proper Option 200 power supply but the 9845T had an Option 100 power supply, underpowered for that configuration, and the 9845B lacked a power supply altogether. The only monitor received with the group was a 98780 enhanced monochrome display for the 9845T. | ||
| As part of the restoration process, the Option 100 power supply has been returned to the 9845B and the Option 200 power supply has been transferred to the 9845T. A standard monochrome monitor has also been obtained so now I'm working on restoring the two monochrome machines and the 9845C project is currently sidelined. | As part of the restoration process, the Option 100 power supply has been returned to the 9845B and the Option 200 power supply has been transferred to the 9845T. A standard monochrome monitor has also been obtained so now I'm working on restoring the two monochrome machines and the 9845C project is currently sidelined. | ||
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| RIFA resin-encapsulated "safety" capacitors - a common vintage computer component and source of problems - were used in the AC power inlet module of the 9845s as well as in the 9845 power supplies. After the inlet filter in the 9845T failed in a dramatic and unpleasant release of smoke, I rebuilt the filter and then replaced the similar units in both power supplies. | RIFA resin-encapsulated "safety" capacitors - a common vintage computer component and source of problems - were used in the AC power inlet module of the 9845s as well as in the 9845 power supplies. After the inlet filter in the 9845T failed in a dramatic and unpleasant release of smoke, I rebuilt the filter and then replaced the similar units in both power supplies. | ||
| - | [[:ac_inlet_filter_rebuild|AC inlet module rebuild]]\\ | + | [[:ac_inlet_filter_rebuild|AC inlet module rebuild for 9845T-1838A06653]]\\ |
| [[:option_100_power_supply_recap|Option 100 power supply recap]]\\ | [[:option_100_power_supply_recap|Option 100 power supply recap]]\\ | ||
| [[:option_200_power_supply_recap|Option 200 power supply recap]] | [[:option_200_power_supply_recap|Option 200 power supply recap]] | ||
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| - | {{9845:docs:09845-90030_9845a_svcmanual_preliminary.pdf|09845-90030_9845A_ServiceManual_preliminary.pdf}} | + | {{9845:docs:09845-90030_9845a_svcmanual_preliminary.pdf|09845-90030_9845A_ServiceManual_preliminary.pdf}}\\ |
hp_9845.txt · Last modified: 2018/09/11 03:03 by cic
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