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WARNING
:
STATIC-SENSITIVE
PARTS
-
HANDLE
APPROPRIATELY.
Table
4-2. System Checkout and Troubleshooting
Procedures
(Cont)
Checkout
Procedure
Fault
Trou bleshootinl(
Procedure
FREQUENCY COUNTER
(Cont)
read
in!( of
5 kHz.
Connect the
Mod
Out port
to
the
Counter
In port
of
the
UUT.
Select
F'req
Counter
display
and
verify
a
nominal frequen
cy
reading
of
I
kHz.
DVM
I.
Maintainin!(
the same conditions as
DVM
AC
mode does
not
I.
Check for
the DVM
si!(nal
at pin
22
of
t he
Front-
with
FREQUEN
CY C
OUNTER
work
.
Panel
Interface
board
(A
1
5). If
it
is
not
present,
C
heckuut Procedure
2.
select
DVM
replace
t
he Front-Panel Interface
board.
dis play
and AC
m(>de on
the
dis
play.
Verify
a DVM
reading
of0.707
Vrms
2.
Check
for short
bursts of
the DVM
AC
signal at
:r
0.04
Vrms
TP2 uf the
~cupe/DV
M
Control board
(A7).
If the
signal
is
not
present
at
TP2,
replace
the
2.
Select
DC
mode and
verify
a
de
Srope/DVM
Cont
rol
board.
read
in!(
uf
near
zeru
vult.s.
3.
If
the
signal
is
okay
tu TP2
of
A7,
replace
the
Processor
Interface
board (A
Ill.
DVM DC
mode
does
not
I.
Check for
t
he
de
input
level attenuated
by
factors
work.
of
I
0
to
less
than
I
volt
at
pin
22
of
the
Front-
Panel
Interface
boa
rd
(A
15).
If it
is
not
present,
or
if it
is
greater
than I
volt,
replace
the
Front·
Pone
l
Interface
hoard.
2.
Check
for the
same voltage
at TP2
of A
7.
If
t
he
sil(nal
is not present, replace
A
7.
3.
If
the signal
is
present
at
TP2, replace
the
Processor
Interface
board
(A
II).
S
C
OPE
I.
Set the
UliT
to
Scope
AC
display
and
No
vertical
d
isplay.
I.
Check
fu
r
the input
signal at TPl
of
the Scope
cunnectthe scope's
vertical
input port
Amplifi
er
board
(A2).
If
it
is
nut present. replace
(Vert
In)
tn
t
he Mod
Out
port. Enable
the
Front-Panel
Interface
board
(AI5).
the internall
·
kHz
modulation
source.
Verify
the
operation
of
each
position
of
2.
If
the
signal
is okay
at
TP
I
, replace the
Scope
the vertocal-input
ran!(e
switch
and
the
Amplifier
board
(A2).
vertical vernier·gain
control.
:l.
With
the
same connection
as
in
s
tep
1,
No
horizontal
sweep.
I.
C'heck
for
a
volta;~e
level
he
tween
-
2.0
V de
and
verity
t he
operat ion
of
each positihn
of
+ :1.0
Vdc at
TP
I
of
the ScopP.
Amplifier
hoa
rd
the
hcorizontal control
and the
(A2l.
If the
,·oltal(e
ca
nnot
he
hrcou~:ht
wothin
ra n~:e
horizon
tal
t
imebase
vernier.
with
eother the'
ertical
ranl(e ottenuator
or
t he
vertical
JJI"ition
t"ntrul,
reptOCe
the
rrunt-
J'anel
:t.
\\'ith
the
horizontal
contrul
set
to
Interface
hoard lA
I
i>l.
externa
l
mode
(Ext
). connect the
external horizonta
l
port
(Ext
Hori?.)
lU
:!.
It
the
\oltlll(t! at T
l'l
'
'okay.
replate the
Sc·upe
the Mode
Ou
t
port.
Verify t
hat
a
Amplitier
hnard
IA:ll.
4-7
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Table of Contents
Troubleshooting
