Tektronix 2235 User Manual

TR O UBLE S
H
OOTI
N
G
T E C HN IQ UE
T he following p rocedure is a
r
ra
n ge d i n
an
order t h at en-
ab les check ing
simp
le trouble p ossi
b ilities b efore r e q uiring
more extensive tro ub les
h ooting . T he first fou r checks en-
sure p ro p er control settings, co
nn
ections, op
eration, and
ad j ustme n t . If t h e trouble is not located b y
t h
ese c
h
ec
k s, t he
remaini n g ste ps will aid in locati ng t
h
e defective com
pone n t .
Wh en t he defective com
p
onent is locate
d , re p lace it, using
t h eap propriate re p laceme
n
t proce d
ure give n un der "Cor-
rective M aintenance" i n t
h
is section
.
CA U
TIO N
I n correct control setti ngs can give α false
i
nd icatio
n
of
i nstrument malfu n ction . If t h ere is any qu estio
n
a b out
t h
e
correct function or o p eratio
n
of any cont
r ol, refer to eit h e r
t he "Operating Instr u ctio
n
s" (Section
2) in t h is ma n ual or to
t he i n strument O p erators Manual .
2 . C
h
ec
k
Associate
d Equ i p me n t
To avoid electrical s
h
oc
k , disconnect t he instr u me n t
from t
h
e powe
r -input
sou
r
ce before
performing vis u al
i ns p ectio
n .
3 . V isual C h ec k
W A RN I NG
W A RN I NG
Da n gerous p ote n tials exist at several p oints t h ro ugh -
out t h is instrument . If it is o p erate d wit h t he ca b inet
removed, do not touc h ex p ose d co nn ectio ns o
r
components .
4 . C h ec k Instr u ment P erfo r ma n ce a nd A dju stme n t
C heck t he p erformance of eit h er of t h ose circuits w here
trouble a pp ears to exist or t h e entire instr u ment . T he
appar-
ent trou b le may only b e t he result of misad j ustment . Com-
p lete performance check a nd ad j ustment i n structions are
give n in Sectio ns 4a nd 5 of t h is manual .
B efo r e using a
ny
test eq
u i p ment to ma ke measure-
me n ts on static-se
n
sitive,
current-se n sitive, o r
volt-
age-sensitive com
p
o
n
e
n
ts or assem
b lies, e n sure t h at
an y voltage or c u rre
n
t sup p lied by
t he test equ i pme n t

5 . Isolate Trou b le to α Circuit
does not excee d th e
limits
of
t he component to be
tested .

To
isolate problems to α p articular area, use t h e tro u ble
sym
p tom to h elp identify t he circuit in w h ic h t he trouble is
locate d . R efer to t he tro ub les
h
ooting c
h
arts
in t h
e "Dia-
1 . C h ec k Co n t r ol Setti n gs

grams" section as an aid
in locating
α fa u
lty circ u it .
6 . C
h
ec
kP
ower S
u pp
lies
W A RN I NG
M ai n te
n
a
n
ce-2235
Service
Befo
r
e proceeding, ensure
t h
at any
e qu i p me n t used wit h

F or safety
r
easons an isolatio
n transformer m u st b e
t h
is
instr u ment is o p erating co r rectly . V erify t h at input sig-

con n ected w he n ever trou b les h ooting is done i n the
nals are p ro p
erly
co
nn
ected a
n
d t
h
at t
h
e inte
r connecting

P rereg u lator an d t he I nverter P ower Supply sections .
cables are n ot d efective . C
h
ec
k
t
h
e power-i
n
put-sou
r
ce
voltages .
C h eck t he p ower sup p lies w h enever trouble symptoms
appear
in
more t
h
an one circuit .
T h
e correct out p ut voltage
and rip p le for eac h su p p ly s h ould be measured b etwee n t he
supp ly test point an d ch assis ground (see Ta b le 6-4 an d
associate d circ u it b oa rd ill u stration) . V oltages may be mea-
sured eit h er b y an D MM or an oscillosco p e, w h ile t he ri pp le
measurements are accom p lis hed only wit h an oscilloscope .
B efore check ing p ower-s upp ly circ u itry set t
h
e Α INTENSI-
TY control to minim u m b rig h tness an d t he Α S E C/DI V
switc h to Χ - Υ mo de .
P erfo r m α visual ins p ectio
n . T h
is c
h
ec
k
may
r
eveal bro-
k
en
connections or wires, d amage d compo nen ts, semico n
ductors
not firmly mo un te d , damaged circ u it boar d s, or

Wh en measuring ri pp le, u se α 1 Χ p r o be wit h α b ayonet
ot
h
e
r
clues .

signal tip attac hed to t he pro b e ti p to mi n imize st r ay pic ku p .

Tektronix 2235 Specifications

General

Brand	Tektronix
Model	2235
Category	Test Equipment
Language	English