Tektronix FG 504

Cleaning
PREVEN
TI VE M AI N T EN A N C E
P reventive mai ntenance steps performed on
α reg u lar
b asis will im p rove t he reliability of
t he F G 504 . H owever,
c h ecks of t he
semiconductors i n t he absence of α
malfu n ctio n are
n
ot
recommended as p reve n tive
mai n - .
te
n ance measures . T he recomme n ded
time for p erfor-
mi n g preve n tive mainte n a nce is j ust
before i n st r ume n t
a dju st m e n t .
Do not use acetone, ΜΕΚ , ΜΙΒΚ , benzene,
toluene,
carbon tetrac h lori d e, tric h loroet
h ylene, met h yl
alco h ol, met hylene c
h
loride,
sulp h uric acid, o r
F reon com p oun d s
for cleaning t he
F G
504 . U se only
clean
water an d α mil d d etergent .
E xte r ior . L oose dust may be
removed wit h α soft clot h
or dry brush . W ater and α
mil d detergent may be use d ;
h owever,
abrasive clea ners should never be used .
I n terio r . Cleaning t
h e i n terior of t he un it sh oul d
p recede
a dj ustme n t si nce t h e clea n i ng process co
u l d alter
t he setti n gs of calibration ad j ustme
n ts . Use low-velocity
com presse d air to b low
off accumulate d d ust . H ardened
dirt can be removed
wit h α soft dry brush , cotton -tip p e
d
swab, or
α clot h dam pen ed i n α solution of water a
nd mild
d eterge n t .
Ad j ustment
After clea n ing or re p airs, do t he performance
check as
d escribe d i n Sectio n 4 of t h is ma n ual
. If all functio ns are
wit h i n sp ecificatio n , no ad j
ustme n t is n ee ded . If o ne or
more of t h e specifications are not
met, calibrate t h e
instrument as d irected i n Sectio
n 4 .
L ubrication
No l u bricatio n is re q uire
d i n t he F G 504 .
T h eory of Operation
Diag r ams
Cam
Switc h C h arts
Circuit B oar
d Illust r ations
Section
5- F G 504 (S N Β 040000 & UP)
M AI N T EN A N C E A
N D I N T ERF ACI
N
G
I NF O RM ATIO
N
T R
O
UBLE S H OOTI N G AIDS
Sectio n 3 of t h is ma nu al ex p lai ns circuit o p eratio
n i n
d etail . T h e section is α troubles h ooti ng aid
w h
e
n used i n
con j un ctio n wit h the circ u it diagra
m s .
Α bloc k d iagram a nd d etailed
circuit d iagrams are
lo-
cated on fol dout
p ages in t he Diagrams sectio n . The
circuit d iagrams s
h
ow
t he com po n en t values a nd assign-
e
d circuit refere nce numbers of eac h com p onent . T
h
efirst
p age of t h e Diagrams sectio n defi n es t
h
e
circuit sym b ols
an d refere n ce design ators use
d i n t he manual . Im p ortant
waveforms and
voltages are sh own wit h i n t he d iag r ams .
Cam
switch es sh ow n on t he diagrams are code d on
c
ha r ts to locate t h e cam n um be r of t he switc h co
n tact i n
t he com p lete switc h assem b
ly,
cou
n ti n g from t h efront, or
k nob e nd , toward
t h
e
rear of t he switc h . Th e c h arts also
i n dicate
wit h α solid d ot w hen eac h co n tact is close d .
To ide n tify electrical com p onents
w h en trouble-
shooting, tur n to t he P arts
L ocation Grid t h at is locate d on
t h e back of α foldout
p age at t he left of t he related circuit
diagrams . Com
p o nen t values, descri p tions, a nd or de r
i n g
data are give n in t he R eplacea b le
E lectrical P arts list .
Compo n ent and
W i r ing Colo r Co d es
Colore d stri p es or d ots on electrical compo
nents sig-
n ify electrical values, tolera
n
ces,
etc ., accordin g to ΕΙΑ
standa r ds . Compo
n
e
n ts not color co ded usually h ave
i n formation
pri n ted on t he body . Some wiri n g co d i n g
follows t he same ΕΙΑ sta n dards .