Table of Contents
Advertisement
WARNING:
STATIC-SENSITIVE PARTS- HANDLE APPRO
PRIATELY.
Table
4-2.
System
Checkout
and
Troubleshooting
Procedures
(Cont)
C
heckout
Procedure
I.
\'t·ri(
_
,
·
that
each
key
has
the proper
t'l
l~t·t
hy ohser\'illl( the
l.en/
Mon Mtr
di,
p
lay
and
emeri n~r
a
frequency
of
11:u
.
·
,c,7
M
Hz
a
nd
a
PL
frequency
uf
li!lll.
(
'het·k (or
prnper
cursor-key
upt.•racion.
:!.
\'
~ril~·t
h
at
t he
up and
down
I>ISI'I..'I
Y.
Fll
CTION.
and
MOI>l'
LAT IO
N keys
work
properly
and
t
h"'ir
a~"rt'ia
ted
LEOs lil(ht
up.
S~
let·t
'"mP
random
cumhinatiu
n
uf
l>ISI'J.A
Y.
Fl
'
NC'TION.
and
MOI>l
'
J.ATI
O
mode~.
S
imu
l
taneuu
~l
y
dt'l>rt-" hot
h
t·ur.ur
keys a
nd,
aft~r
a
five·
,t·t·•••HI
tl
~lfly.
tu
rn t
he$yHtem
power O
FF'.
T
urn the >Y>tem
power
hac
k
ON a
nd
"'""
th~ttht-..,tme
DIS
PLAY,
Fl
M
"1'10
1\.
11nd
MODULATION
mode>
Fault
POWER
ON
(Cont
)
System
turns un,
but
there
is
no
d
isplay
on
the
CRT
fur
any
mode.
KEYBOARD
Only
une
key is
inoperative.
More t
han
une
key
is
in<lp
erative
or
has
the
wrun~:
etfect.
Troubleshooting Prncedure
:l.
Check fur
short.• tu::round at
TP
1.
TP2,
TP~.
TP4.
TP.'\, TP6. and
TP7
of the Ou
tp
ut
board
(
A
i\).
If there is
a s
hort.
remove AS
and
recheck
for
shorts
to
ground
on
the
A5
alone at all
tes
t p
oint.•.
If there
is
still
a
s
hnrt. replace
AS.
If
there
is no
short
,
locate
the
s
ho rt
in
the
system
.
I
.
Remove the
hut
tom
cover
of the
Sy~
tem
Analyzer.
C
heck
for
approx imately
-
4.:1
Vdc
at
ed!(e-
con
nectnr
pins
27
and
28
and
fur
--
4.69
Vd
c
at
edl(e
-cunnector
p
ins :1
and
4
of the
Hi!(h· Vultal(e
Power
S upply
IAI
). If
vul tal(e~
are
not
pre~ent.
replace
A
I.
2.
C heck
for the presence
of
a
:20-k
Hz squa re
wave
s
il(na
l
at
U4
pins
I
I
and
14
uf
the
C
ontrol
hoard
(A4).
If
signals
are
not
presen t. replace A4.
:1.
C hec
k
fo
r
a pproximately-+ 110
Vd
c
at
TP
I and
-
110
Vdc
at TP7
n
f
t
he
Output hoard
(AS).
If
voltal(es are
nut
present.
rep
lace Af>.
4.
In
Gen/
Mun
Mtr
dis
p
lay.
check
for
the p
resence of
a 110-Vp-p ramp sil(n::tl at
T
P:Z.
TP:I.
TP4
,
a
nd
TP5
of the
Scope
Amplitier
hoa
rd
(A2). If
s
il( nal~
are
no
t
present. replace
A2.
5.
If
t rouhleshuotinl( s teps
1·4 check out ukay.
replace
the
CRT.
Replace
t he defective
key
switch.
Replace
the
P
ruces.
" <>r
buard.
N
O NVOLAT
I
LE M
E
MOR
Y
Any part
of
the
no
nvolatile
memury
fail
~
tu
re
member.
4-3
WARNIN\.
Lithium
Batt
Pry
Du nut multilnte
or
di
s
a
~;.~m
h
l
e
the
hanery cell. T he lit
hi
um
metal
is
a
\'ery
active
mater
ia
l
that hurr"
in
t
he
pre;.eme o
f
\\ater
or
h
•~h
humid1
ty.
Do
nut
put
the
hatter_
,
.
in
lire.
nllempt to
l'harl(e
11.
heat
it
a
hove
ll
~
l·('.
u
r
M>lder
dire\'11\'
I<>
t
ht· ('ell.
l>o
nut overdi>charl(t-
Advertisement
Table of Contents
Troubleshooting
