5 Sep
2009
5 Sep
'09
1:52 a.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] Namens Tony Duell
Verzonden: vrijdag 4 september 2009 20:03
Aan: cctalk at classiccmp.org
Onderwerp: Re: Omrom programmable terminal
In most cases the fault finding tree of HP serv. doc. is more then
sufficient.
Remember those were het same engineers who build all those nice machines ;-)
And of cause by observing the behaviour(and error leds/codes) of a machine
you get a reasonable clou where to search for a fault.
I have the signature analyser and the logic
comparator.
The signature analyser is usefull if you have a HP
equipment with the
according serv. Manual under test.
Sure, the service manuals often give the signatures. So you
connect up the signature analyser (start/stop/clock leads)
and stick the probe on a given point. If the signature agrees
with the one in the manual, fine. If it doesn't, then what?
OK, there's a fault, but in a lot of complicated systesm,
particularly if state-machine or microprocessor based, a
fault just about anywherre will corrupt all the signatures,
So how do you determine which device has actually failed? > Fault finding goes rather quick then, the logic
comparator is only
> usefull with clock frequenties below aprox. 10Mhz above that the
> cable impedance is to big.
High of cause ..
Using a Fluke
9100A boardtester is much more usefull,
because you can
test in cuircit ram, drivers and processor.
I keep the HP stuff for collecting purpose ;-)
To be honest, if I saw either instrument at a low-ish price
(including shipping!), I'd probably buy it. I like HP stuff :-)
And it's nicely build...
You do not need to tell me that :-) -tony
-Rik