10 May
2013
10 May
'13
10:25 p.m.
I have an HP 9872 plotter that just died. According to the internal self
test (very nice!)
one of the bib (MOS to TTL) drivers has failed. A scope shows one data
line not moving also.
The HP part number is 1820-1584. I can't find a cross reference on the
web for it. Does anyone
know if there's an equivalent chip? It's a 20 pin dip.
+7 volts on pin 20, gnd on 10
MOS side is pins 1-8, TTL side is 12-19
A signal called TTL on pin 9 and another control signal, BD on pin 11
I would love to get this running again.
Thanks,
Bob