5 Apr
2007
5 Apr
'07
12:29 p.m.
On Thu, 5 Apr 2007, Tony Duell wrote:
The chip is a 16 pin DIL package marked with the HP
house-number
1858-0054. That's not in my equivalents list. The chip seems to have been
made by RCA, and tracing the connections to it show that 2 of the pins
are grounded, but none of them go to any power line. I susepct it's a
transistor array, therefore (HP1585-xxxx numbers tend to be transistor
arrays too).
...
Does anyone have any suggestions as to what it might be? Anyone have an
HP9816 with this IC labelled with somethign other than an HP house number?
It looks like a quad NPN transistor array. This Agilent service
manual:
http://www.home.agilent.com/agilent/redirector.jspx?action=obs&nid=-357…
...shows it as Q305, and the schematic will give you the pinouts.
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/