14 Apr
2008
14 Apr
'08
2:35 p.m.
Sorry, I need to replace both and ment that the 2n2222 isn't a problem, but
the QP1008 is.
The PSU isn't build by HP but by RTE POWER/MATE a firm with doesn't exist
any more.
The text on the QP1008 (TO3) is QP1008 and the date stamp 8413 and the
Motorola sign.
I do have a Motorola component cataloge from '83 but can't find the part in
there and in my other books.
On the schematics of Tony the part is mentioned as QP1008
http://www.hpmuseum.net/document.php?hwfile=4020
I need to know witch transistor I can use to replace it.
Rik
----- Original Message -----
From: "Eric Smith" <eric at brouhaha.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Monday, April 14, 2008 11:13 PM
Subject: Re: Replacement for QP1008 (HP9816 PSU)
Rik wrote:
I aquired a HP 9816 with a faulty power supply.
Thanks to the diagrams of Tony I found out that the switching transistor
QP1008 is shorted and a 2n2222 but thats no problem.
I googled for it and searched my datbooks but can't find any replacement
or
datasheet for it.
So does somebody knows the specs or a replacement for this transistor ?
Maybe I don't understand what you're asking, but the replacement for a
2N2222 is a 2N2222. They're still made, and not at all hard to find.
If that's not what you're trying to replace, what is the part number
you're replacing? I could be wrong, but QP1008 looks like a component
designator, not a part number. Even if there's only an HP part number
(e.g., 181x-xxxx), that's more useful for finding a replacement than
a component designator.
Eric