Tektronix FG 504

M aintenance-FG 504 (SN Β 040000 & UP)
Testing E quipment
Generally, α wide-band
oscilloscope, α low-
capacitance probe, and
α multimeter are all that is n eeded
to perform basic
waveform and voltage checks
for d iag-
nostic
purposes . The calibration p rocedure
lists specific
test eq uipment n ecessary to ad
equately check out the
instrument .
T RO UBLE S H OOTI
N
G
TE C HN IQ UE S
T his troubleshooting
p rocedure is arranged in an order
that checksthe
simple trouble possibilities before p ro-
ceeding to extensive troubleshooting .
Control Settings
I ncorrect
control settings can appear to bean equip-
ment p roblem . If there is any question a bout
the correct
function or operation of any
control, see the operating
instructions in Section 2
.
If the F G 504 is
operating as part of an interconnected
system or
test setup, also check control settings of the
other
instruments in t he setup . Check for proper
inter-
connections between the p ower
module and t he p lug-in
modules . Check t hatthe signal
is properly connected and
that the
interconnecting cables and signal source are
not
d efective . Check t he p ower source .
If the p
ower module is suspected, try substituting
another F G
504 k nown to be good i ntothe power
module .
If the
trouble persists after substitution, move the F G 504
to other
compartments in t he p ower module to
determine
if
the trouble is confined to one
compartment or is
common to all of them .
V isual Check
R emove the covers from
the F G 504 and look for
broken wires, loose
or unsoldered connections, or
d amage to
the circuit board . If components d amaged
from
overheating are found, d etermine the
cause of over-
heating before re p lacing
the component ; otherwise, the
new com
p onent may also b e damage d .
Static-Sensitive Components
5- 2
Static d isc h arge can d amage
any semicon d uctor
componen t in t h is
i n
st
r ume n t .
T his instrument contains electrical
components that
are susceptible to d amage from static
discharge . See
Table 5-1 for relative susceptibility of various
classes of
semiconductors . Static
voltages of 1 kV to 30kV are
common in
unprotected environments .
Observe the following
precautions to avoid damage :
1 . M inimize h an d ling of static-sensitive components
.
2 . Transport
and store static-sensitive components or
assemblies
in t heir original containers, on α metal
rail, or
on
conductive foam . L abel any package that
contains
static-sensitive assemblies or components
.
3 . Discharge
the static voltage from your body by
wearing α wrist strap w hile handling
these components .
Servicing static-sensitive assemblies
or components
should be p erformed only
at α static-free workstation by
q ualified service
personnel .
4 . Nothing capable of generating or
h olding α static
charge should be
allowed
on
the work station surface .
5 . K eep the component leads
shorted together when-
ever possible .
6 . Pickup
components bythe b ody, never by
the leads .
7 .
Do
n ot slide the components over any
surface .
8 . Avoid handling
components in areas that h aveafloor
or work
surface covering capable of generating
α static
charge .
9 . Use α
sol d ering iron t hat is connected to
earth
g round .
10 . Use only special
antistatic suction type or wick type
d esoldering tools .
Test E q uipment
B efore using any
test equipment to make meas-
urements on
static-sensitive components or assemblies,
be
certain that any voltage or current supplied
by the test
equipment d oes
not exceed the limits of the component to
be
tested .