2065 MAINTENANCE APPROACH
(Cont)
3.
Try to isolate trouble by halving the amount
of
circuitry involved with each step.
For
example,
if
you
start at a red-light indicator driver and scope backward tluough the
ALD's a logic block at a time, you
will
reach the trouble (eventually). Rather,
go
back
to some point
in
the middle that you know must
be
good or
it
will cause the indicated
trouble. Scope it and
go
from there, forward or backward, hut PLEASE,
not
a block
at a time.
4.
If
you
seem
to
be getting nowhere in troubleshooting a particular hug, go back and
recheck
~hat
symptom you saw earlier (the one
on
which you
have
been basing all
your efforts). It's easy to misread an indication.
5.
If
you're still having trouble, look at the indicators.
6.
Do
you have more than one trouble? (Not too likely, but
it
does happen.) Also,
you
may have only one trouble (one symptom)
but
several bad components. Perhaps a
power surge or a short has wiped out more than one card
of
the same type and you've
been swapping bad cards.
S4
5/360
MODEL 65
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