Tektronix FG 504

M aintena
n
ce-
F
G
504 (S N Β 040000 & UP)
cable p lugs from t he board
an d remove it from t he
i n
st
ru me n t . It will be necessary to remove t h e screws
h oldi n g t h e retai n i n g cli p s if it is n ecessary to remove t
h
e
board from t h e bac k panel .
C
h ec k ing Transformer Ph asing
If t he
F
G
504 is used in early models of the TM 500-
Series P ower M odules, ri pp le on t he outp ut waveform ca
n
be excessive i n some cases . T h e ripple resultsfrom
P ower
M o du le transformer ph
asing t h at is i n compati b le wit h
F G 504 operatio
n ; h owever, t h e p roblem is easily cured .
To determin e if your P ower M od ule is properly
ph
ased,
p lace t h e F G 504 i n op eration on two exte
n der
ca
b les .
M ake certain bot h exte nder cables
are firmly con nected
(do not attem p
t
to o p
erate t he F G 504 wit h only one
exten
d er cable) .
Turn to t h e
R
ear
I n terface Connector Assig n ments
p ullo u
t at t he rear of t h is section . L ocate pin 13 Α on t
h
e
M ain boar d (left boar d wh en viewi ng t
h
e rear
of t he
instrumen t) . U sing an ac voltmeter, measure
t h e voltage
from pin 13A to c
h
assis
grou n d ( p in 9 Α ο r 9Β ) . Th e normal
voltage is
about 35 V rms . If t he voltage is about 15 V rms,
t he p h asi n g is incorrect . Correct t he p
hasing b y i n -
terc h a nging t h e wires to pins
13 Α a n d 13 Β i n t h e P ower
M od ule . M easure t h e voltage
from p in 1 Β to ch assis
grou nd and interc
hange t h e P ower M odule wires to pins
1 Α a nd 1 Β if i n dicate d . C heck all com p artments of t h e
P ower M od ule for proper ph asi ng .
M aintenance
R
efer to t
h
e TM
500-Series P ower M odule ma n uals for
com p lete mainte nance i n formation . Wh en re p
lacing cam
switc h contacts, order H ig h F re q uency
Cam Switc h
R epai r K it . See t h e M aintenance Aids .
Do
not attem p t to o p erate th e instrument unless
8Ο ΤΗ p lug in car d sare co n necte d
to t h e mainframe .
P
A R TS O R D ER I N G A N D REPL ACI N G
Or d eri ng
5-6
NO
ΤΕ
Standard P arts . All
electrical a nd mec h anical replace-
me n t parts can be o
b tained t h roug h t he local Te k tro n ix
F iel d Office or
re p rese n tative . H owever, many of t he
sta n dard electronic
components can be obtai ned locally
i n less time
t h an is re q ui r ed to or d er t h em fromTe k tro n
ix,
Inc
.
B efore p urch asi ng or ordering re p laceme
n t p arts,
check t he R eplaceable P arts lists for
val u e, tolerance,
rating, a nd d escri p
tio n . Wh en selecting re p laceme n t
parts, it is im p ortant to
remem b er t h at t he p h ysical size
an d s ha pe of t
h
e com
p
o
n e n t may affect its performance i η
an
i n strume n t . All r e p laceme n t parts sh oul dbe
direct
replaceme n ts unless it is kn own t
h
at α
d ifferent compo-
n entwill n ot adversely
affect t h e instrume n t p erformance .
Sp ecial P arts . Some
p arts are ma nu factured or selected
by
Te k tronix, I nc ., to satisfy p articular re q uireme n ts, or
are manufacture d fo r Te k tronix, Inc ., to our
specifications .
M ost of t he mec h anical
p
arts u
sed in t h is system h ave
bee n ma nufactured by Te k tronix, Inc .
Or d er all s p ecial
p arts directly from t
h
e local
Te k tronix F iel d Office or
represe
n tative .
Orderi n g Proce d ure .
Wh en or d ering replacement parts
from Te
k tro n ix, Inc ., p lease i n clu d e t he following min-
im u m i n formation :
1 . I n strument ty pe ( F G 504)
.
2 . I n strument serial n umber (for exam p le, Β 040251) .
3 .
Α d escription of t he p art (if electrical, include t he
ci r cuit
number) .
4 . Te k tro n ix part nu mber .
Please do not retur n any instruments or p arts
before
receivi ng d irections from Te k
tronix, I nc .
Α listi n g of Te k tro n ix F iel d Offices, Service
Centers,
an d Re p rese n tatives can be found
i n t he Te k tronix
P ro d uct Catalog and Su p
plements .
C U
STO M IZI N G
Customizi ng t h e Interface
I n put a nd output accesstot he F G 504 is available at t
h
e
rear of t he floati n g interface a nd mai n circ
u it boards .
F igure 5-2 identifies t h e contacts an d
t h eir respective Ι / Ο
assig n ments .
Α p ower module mainframe optio n (Option
2)
is
availa
b le t h at p rovi d es α rear- p anel, multi-pin co
nn
ector
to
w h ic h Ι / Ο lines can b e h ard-wire d for
external access .
Also p ossible are inter-com
p artment conn ections wit h
ot h er p lug-i
n
mo
d ules in multi p le-compartme n t mai n -
frames .
REV Α APR 1980