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HP-85A Dead
12-07-2014, 04:15 AM
Post: #1
HP-85A Dead
Hello Folks!

i have a HP85A , and this not working. i check the voltages, and the bad are -5 volts
this drop to near 2 volts. also the i/o chip 1MA8 0101 and the cpu chip 1MB1 0101
goes very hot. y remove this chips and the voltages come to a good value of -4,98 volts. so i suspect as this two chip as bad.

anybody kown where i can get these chips? the ones in the board are ceramic with gold plate parts. i saw these chips in plastic carriers as udes in the hp85B is true this?

thanks in advance by the help , and sorry by mi very bad english.

jj
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Messages In This Thread
HP-85A Dead - juanjo_r - 12-07-2014 04:15 AM
RE: HP-85A Dead - cruff - 12-07-2014, 10:10 PM
RE: HP-85A Dead - juanjo_r - 12-08-2014, 02:30 PM



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