HP-67 1706A00901 [RA and RB with Spike, doesn't read - doesn't write]
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11-21-2021, 03:06 PM
Post: #7
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RE: HP-67 1706A00901 [RA and RB with Spike, doesn't read - doesn't write]
I have swapped the CPU board with a known working one
The spikes on RA and RB have disappeared and the original card reader worked ! I also have uploaded more pictures for this unit, and I must say that the label on the CRC chip (which I had totally ignored) probably should have inspired me a little Also for this unit, RA and RB measured at the CRC chip with the card reader disconnected are clean but when the card reader is connected the spikes show up. This happens only with this CPU board. Looks like also in this case the CRC chip is probably the one to look after .... Updated Album : HP-67 1706A00901 thanks again for the support ! take care ! Edoardo & Alberto |
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Messages In This Thread |
HP-67 1706A00901 [RA and RB with Spike, doesn't read - doesn't write] - albertofenini - 11-19-2021, 11:32 PM
RE: HP-67 1706A00901 card reader test - teenix - 11-20-2021, 01:09 AM
RE: HP-67 1706A00901 [RA and RB with Spike] - albertofenini - 11-20-2021, 09:30 PM
RE: HP-67 1706A00901 [RA and RB with Spike, doesn't read - doesn't write] - teenix - 11-20-2021, 11:47 PM
RE: HP-67 1706A00901 [RA and RB with Spike, doesn't read - doesn't write] - albertofenini - 11-20-2021, 11:59 PM
RE: HP-67 1706A00901 [RA and RB with Spike, doesn't read - doesn't write] - teenix - 11-21-2021, 12:06 AM
RE: HP-67 1706A00901 [RA and RB with Spike, doesn't read - doesn't write] - albertofenini - 11-21-2021 03:06 PM
RE: HP-67 1706A00901 [RA and RB with Spike, doesn't read - doesn't write] - AndiGer - 11-21-2021, 05:27 PM
RE: HP-67 1706A00901 [RA and RB with Spike, doesn't read - doesn't write] - albertofenini - 11-21-2021, 06:08 PM
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