Tektronix 2213 - Page 92

T R O UBLE SH OOTI
N
G
E Q
U
I PMEN T
T h
e e
qu i p ment listed in Ta
b le 4-1, or e q uivalent e quip -
me n t, may b e useful w
h en trou blesh ooting th is instrument .
TR O UBLES H OOTI NG
TE
C
HN IQ UES
T he following p rocedure is arrange d in an order t
h
at
e n a b les ch ec k ing sim p le tro ub le p ossibilities
b efore
re q uiri ng more extensive troubles h ooting
.
T
he first fo ur
c h ec k s ensure p roper control settings,
connections,
o p eration, and a d ju stment . If t h e trouble is not located b
y
t h ese ch ec k s, t h e re m ai n ing ste p s will ai d in locating t
h
e
d efective compone n t . Wh en t h e d efective com p onent is
locate d , re p lace it, using t h e ap p ro p riate re
p
lacement
p roce du re give n unde r "Corrective
M aintenance" i n t h is
section .
3 . V isual C h ec k
B efore u si ng any test equipment to ma
ke measure-
ments
on static-sensitive, c urre n t-se n siti v e, o r voltage-
sensitive
com p onents or assemblies, ensure t
h
at
a ny
voltage or cu r re n t su pp lie d by t
h e
test
equipment
d oes not excee d the limits of t h e compo
n
ent to be
teste d .
1 . C h ec k Control Settings
Inco rr ect control settings can
give α false i nd ication of
inst r ument malfunctio n . If t
h ere
is any
questio n ab o u t t h e
correct fu
n ction o r o p e r ation of any con trol, r efer to
eit h er t he "O p erating Instr u ctions" (Section 2) in t h is
manual o r to t h e i n strume n t O p erators Manual .
2 . C h ec k Associate d Eq ui p ment
B efo r e p rocee d i n g, ens
u
re t
h
at any
e q ui p ment use d
wit h t h is instrument is o p
erating cor r ectly . V erify t h at
in p ut signals are p ro pe r ly
connecte d an d t h at t h e inter-
connecting ca b les are
n
ot
defective . C heck t he power-in p u t-
source voltages .
W A RN I N G
To avoi d electric s hoc k , disconnect t
he
inst
ru ment
from t h e powe r -inp u t sour ce befo r e p
erfor ming
visual
inspection .
P erform α visual i
n spectio n . T h is ch ec k may reveal
bro ken connections
or wires, d amaged com p one n ts, semi-
con du cto r s not firmly mo
u nte d ,
d
amaged circ u it b oar d s,
o r ot
h
er cl ues .
W A RN I N G
Dan gerous potentials exist at several points t hr oug h -
out t h is inst r ument . If it is ope rate d wit h th e cabinet
removed, do not touc h exposed co n nections o r
components
4 . C h ec k Instrument
P
erformance an
d
A
d j ustment
Ch ec k t he p erformance of
eit h er
t
h ose circ u its w h ere
trouble a pp ears to
exist or the en tire instr u ment . T he
a p parent tro ub le may only be t
he
r es
u
lt
of misa d j ustment .
Com p lete p erforma
n
ce c
h
ec
k
an
d ad j ustme nt i n structions
are given in Sections
4 an d 5 of t h is man u al .
5 . Isolate Trou b le to α Circuit
M ainte n ance-2213 Service
To isolate pro b lems to α particular area, use t
h
e trou
b le
sym p tom to h el p i d e n tify t
h e
circ
u it in w h ic h t he tro ub le
is located . R efer to t
he
t
r
o
u
bles
h
ooting c
h arts in the
"Diagrams" section as an ai d in locating α fa
u lty ci r cuit .
6 . C
h ec k P ower Su pp lies
W A RN I NG
It is recommen d e d for safety t h at an isolation t r ans-
forme r be con necte d between t he ac -power so ur
ce
and t h e a utotransfo r mer w h e n eve r t r ou bles
h
ooting
is done in t h e P reregulator an d the
Inverter Power
S u pply sections .
M
ost
a u totr ansfo r mers are NOT
isolation t
r ansforme rs .
Ch ec k t he power s up plies
w h enever tro ub le sym p toms
app ear i n more t h a n
one
ci
r
cu it . T
he
co
r rect outp ut voltage
a nd ri pp le fo r eac
h
s
u pply s h oul d be meas u re d b etween t he
su pp ly test
point a nd c h assis ground (see Diag r am 9 and its
associate
d ci r cuit boa rd illust r ation) . Wh en ch ec k ing power-
supply circuit r y u tilizi ng commo n as t h e refere n ce, use
eit h er α D MM or an oscilloscope an d ob serve t
h
e prece d
ing
W A RN I N G . If p ower s upp ly voltages a nd
r i pp le are wit h in
t h ei r liste d ranges, t h e supp ly can be ass u
me
d to be
operati n g correctly . If any a r e o u tsi d e t
h eir ranges, the
su pp ly may b e eit
h
e r misad j uste
d or operati n g i n correctly .
Α defective compo n ent elsew
h
ere in t
he instr u me n t can
create t he appeara n ce of α power-su pp
ly p ro b le m a nd may
also affect t he ope r atio n of ot he r circuits .
7 . C h ec
k Circuit B oar d Interconnections
Afte r t
h e trou b le h as b een isolate d to α partic u la r
circ u it, again ch ec k for loose o r br o ken co n nectio n s
and
h eat-damaged com p onents .
6-7