Sage II - Intermittance Checklist; RAM Suspects; Cable and Connector Checks; Chip Seating and Solder Connections

1..
2.
3.
SAGE
rI
SERVICE
MANUAL
[1.0]
INTERI"TITTANCE
CIIECKLIST
X INTERIITITTATVCE
CHECKLIST
:
If the
system
ls
lntermittentr p€rforn
thls
checkllst,
then
re-teet
wlth
CYCLER:
RAMS
are suspect
in
intermlttent
fallures.
If RAI,IDISK
ls
belng
used,
try
operating
wlthout
it.
If
no
problen
occurs, lsolate
the
bad
RAt'{
by swapplng
one by
one
wi th a
good
RAM.
Check
all
cables
and
connectors.
Ttre
cables
should not
have
been
pinched.
Posts for
cable
connectors
ln
the
pc
boards
should
stand
so1ld
and
not
wtggle
when
touched.
Inspect for
chlps
that
are not
seated
completely lnto
the
socket.
Press down flrrnly
on
all
chlps
to
Lnsure
that they
are
naklng
good
conneetlon
wlth
the
socket.
Inspect
the
pins
of all
the
chlps to
see
lf
any
are
curled
under
the
chtp
lnstead
of
going
lnto
the
socket.
Iook
f
or foreign
matter
Jaurmed
ln wlth
the
pln
of a
socket.
Are the
caPacltors
the
rtght
values?
Check thelr voltage
ratlng.
Underrated
capacltore
(09
uf
6v)
across
the
LzV
power
supplles
may
have
rrcrked
for
some
tlne
before the
caps flnally
degraded
enough
to
cause
problems.
Even lf
the
voltages
look
ok,
ar..,.
of these
caps
MUST
be replaced
wlth
10uf
25V caps as
they
w111
cause
problems
sooner
or later.
5.
Check for
temperature
sensltlve
chlps.
Use
the
TEMPEMTURE
test.
Check for
lnproper
solder
connectlons.
Inspect
the
board
for
graylsh
solder
areas
on the
plns.
A11
feed-through
holes
should
be
fllled.
"Beads"
of solder
lnstead
of a
smooth
base
on a
pin
are
also
suspect.
Touch
up the
board
wlth
a
snall
solder
ttp
and
run
the
CYCLER
test.
h.
6.
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