Tektronix 2235 User Manual

P reventive
mai n te nance performed on α r egular basis

An ill u stration
d e p icting t h e location of α circ u it b
oard
wit h in t h e inst ru
ment is s h own on t h e foldout p age ad j ace n t
s h ould reveal most p otential p ro blems b efo r e an instrume n t

to t h
e circuit board illustratio n .
malfunctions . However, s h o u ld troubles h ooti n g
b e requi
r
e d ,
t
h
e followi n g informatio n is p r ovided to facilitate location
of
α fa u lt . In additio n , t h e mate r ial p r ese n ted in t h e "T h eory
of
Operatio n " and t h e "Diagrams" sectio n s of t h is ma nu al
may

Ci r cuit B
oard
I n
te r connectio n Diag r am
be
h elpful w h ile
troubles h ooti n g .

Α circuit
b oar d cable dist r i bu tion diag r am and co nn
ector-
T R O UBLE S H
OOTI N G AIDS

p
i n locato r ta b le
is p
r ovi
d ed in t h e "Diagrams" section to ai d
i n tracing
α
sig
n al p at h or p ower sou r ce b etwee n b oards . All
Sc h ematic
Diagrams

wi r es, p
lug a
n
d j ac k num b ers are s h ow n along wit h wire
o
r
p i n nu mbe r s .
Complete sc h ematic diagrams
a
r
e located on tabbed
foldo u t p ages in t h e
"Diagrams" section
.
T h e p ortio n s of
circuit r y t h at a r e mo un
ted on eac h ci r c u it board a r e e n -
close d wit h in h eavy
blac
k li n
es . Also wit h in t h e b lac k lines,
near eit h er t h e top or t h
e bottom edge, are t h e assem b ly
num b er a n d name of t h e
circuit b oard .
Compo n e n t n
um b e
r
s a n d elect r ical val u es of com p o-
n e n ts in t h is i n strument
are s h ow n on t h e sch ematic dia-
g r ams . R efer to t h e fi r st p
age of t
h
e "Diag r ams" sectio n for
definitions of t h e refe r e n ce
d esig
n
ators and sym b ols use d to
i d e n tify com p o n ents .
Ci r c u it B oa rd Illust r
ations
Circuit board illust r ations
(s
h
owing t h e ph ysical locatio n
of eac h com p one n t) are p r ovi d
ed for u se in con jun ction wit h
eac h sc h ematic d iagram . Eac h
boa rd ill u stratio n can b e
found on t h e bac k side of α
foldout p age, p r eceding t h e
sc h ematic diagram(s) to w h
ic
h
it
r
elates . If more t h a n o n e
sc h ematic diagram is
associate d wit h α p articula r circuit
board , t h e b oar d illust r atio n
is located on α left- h an d p age
preceding t h e diagram wit h w h
ic
h
t
h
e boa rd is fi r st
associated .
Also p r ovi d ed in t h e
"Diagrams" section is an illust r atio n
of t h e bottom side of t h e M
ai
n
circuit board . T h is dr awing
facilitates trou b les h ooting by
s
h owi
n g t h e co nn ection p ads
a n d t h e locatio n of com p o n
ents t
h
at are mo un ted on t h e top
side of t h e b oar d . P ro b i n g
of
M
ai
n
b oard com p onent signals
t h at a r e i n accessi b le from t h
e to p side ca n be ac h ieved wit h -
o u t t h e n ecessity of
disassembli n g p ortio n s of t h e
i n strument .
T R OUBLE
S
H
OOTI N G
I N T
R OD U CTIO N
Ci r c u it B oa rd L
ocatio n s
P owe r Distrib
u tion Diag r am
T r o ub les h
ooting C
h
arts
M
ai
n
te
n
a n ce-2235 Service
Α P
ower Distribution diagram 8 is p rovided to aid in
t
r
o u -
bles
h
ooting p ower-sup p ly p roblems . T h
is diagram s h ows
service j um p ers used to remove power from
t h e various cir-
cuit
boar d s . E xcessive loadi n g on α power
sup p
ly
by α ci r -
c u
it
board ca n be isolated to t h e fa u lty
b oard by
d
isco
nn
ecti n g ap p ro p riate service ju mpers .
G r i d Coo r d i n ate
System
Eac h sc h ematic
diagram and circuit b oa rd illust r atio n h as
α gri d b order alo n g its
left a nd to p edges . Α ta b le located
a dj ace n t to eac h sc h ematic
diag
r
am lists t h e g r id coo rd i-
nates of eac h
compone n t s h own on t h at sc h ematic . To ai d
in ph ysically locating
α com p one n t on t h e res p ective circ u it
b oa rd , t h is ta b le
also lists t
h
e ci r c u it- b oa rd grid coo rd i n ate
of eac h com p onent .
Ad j acent to
eac
h
circ u it b oard illust r atio n is an alphanu-
meric listi n g of every
compone
n
t mounte d on t h at b oa rd . Α
seco n d col u m n in t h is listi n g
identifies t h e sc h ematic dia-
g r am i n w h ic h eac h com p o n
e
n t
can be found . T h ese compo-
n e n t-locato r tables are
es p
ecially
u seful w h e n mo r e t h a n
o n e sc h ematic d iagram is
associate d wit h α p artic u lar circuit
b oard .
T h e tro
u bles
h
ooti
n g
c h arts co n tai n e d i n t h e "Diagrams"
W avefo r m test- p oint locations
a
r
e also identifie d on t h e

section a r e to b
e used as an ai d in locati n g malf un ctio n ing
circuit boa r d illustration by h
exago
n
al-o u tlined nu mbers t h at

circuit r y . To use t h e c h arts,
begi
n
wit h t h e T r oub les h ooti n g
corres p o n d to t h e waveform nu
mbers app earing on b ot h t h e

Guide . T h is
c
h
art
will
h el p identify α p articula r pr oblem a r ea
sc h ematic diagram and t h e
wavefo
r m ill
u stratio n .

for furt h er
troubles
h
ooti n g .

Tektronix 2235 Specifications

General

Brand	Tektronix
Model	2235
Category	Test Equipment
Language	English