Maintenance; Preventive Maintenance; General Information; Cleaning - Tektronix 7a11 Instruction Manual

General I
n
formatio
n
T
h
e 7 Α 11 Am
p
lifier s
h
o
u
l d
b
e cleane
d
, l
u
bricated, in-
specte
d
, a
n
d recalibrated at regular i
n
tervals . Α recommen
d
-
e
d
sc
h
e
d
ule for ave
r
age o
p
e
r
ati
n
g co
n
d itio
n
s is every 6
mont
h
s or every 1000
h
o
u
rs of o
p
eration, w
h
ic
h
eve
r
occurs
first .
Cleaning
K eepi
n g t
h
e e
qu
i
p
ment clean can
h
el
p
to maintai
n
pea
k
p
erforma
n
ce a
n
d lengt
h
en its operating life . Dirt on com-
p
o
n
e
n
ts can result in s
h
ort circ
u
its or re
d
uce
d
fre
qu
e
n
cy re-
s
p onse . Α dry, soft clot
h
a
nd
α soft-
b
ristle
d b
r
u
s
h
are
recomme
nd
e
d
fo
r
removing loose d irt from t
h
e outsi
d
e of
t
h
e i
n
st
r
ument . Dirt on
t
h
e i
n
side s
h
o
u
ld be loosened wit
h
α soft-bristle
d b
rus
h
a
n
d removed b y usi
n
g α vac
uu
m clea
n
-
er or α st
r
eam of low-pressure ai
r
. High-pressure air can
d
amage t
h
e e
qu i p
ment a
nd
s
h
oul
d n
ot
b
e used .
U
se an eyeshield
w
hen cleaning
w
ith pressurized air.
H a
rd
e
n
e
d d
irt s
h
o
u
l
d b
e removed
b
y usi
n g α mil
d d
eter-
ge
n
t an
d
water solutio
n
on α cotto
n
-ti
p
pe
d
swa
b
or α soft
clot
h
. Disconnect t
h
e e
q
ui p me
n t from p owe
r
so u rces
b
efo
r
e
u
si
n
g t
h
e solution . Avoi
d
excessive use of wate
r
. Do
n
ot
allow wate
r
to penetrate any parts. Dry t
h
e instr
u
me
n
t
t
h
oro
u
g
h
ly before e
n
e
r
gizing it. Avoi
d
t
h
e use of abrasives
and c
h
emical cleaning agents . P rotect t h
e e
qu
i
p
me
n
t from
d irt and d a m
age b y
k
ee
p
ing it cove r
e
d wh
e
n
not in
u
se .
Visual Inspection
Afte r cleani
n
g, t
h
e e
qu
ipment s
h
ould be carefully i
n
-
specte
d
for defects s
u
c
h
as poor co
n
nections, damage
d
parts an
d
impro
p
erly seated
t
r
a
n
sistors a
nd
integrate
d
cir-
cuits . Damaged
p
arts re
q
uire t
h
at t
h
e cause of t
h
e damage
b
e eliminate
d b
efore ope
r
ation is resu
m
e d .
L
ubrication
Ο
PREVE
N TI
VE M
AI
N
T
EN
A
N
C
E
WA RN ING
T
h
e
V
O
L
TS/DI
V
cam switc
h d
ete
n
t a
nd
t
h
e VARI-
ABLE slide switc
h
t
r
ac
k
s s
h
oul d be give
n
α very lig
h
t
S
E CTIO N 4
MAINTENANCE
C hange information if any, affecting this section will be fo un d at the
r ear of the manual.
7 Α 11
ap
p
licatio
n
of l
u
brica
n
t w
h
e
n
mainte
n
a
n
ce a
nd
calibratio
n
is being performe
d
. U se B eaco
n
no . 325 g
r
ease or e
q
uiva-
lent, Te
k
tronix Part No . 006-0147-00 . Do
n
ot lu
b
ricate t
h
e
O
FF
S
E
T pote
n
tiometer beari
n
gs . Co
n
tact α Te
k
tronix
F iel
d R
e
p
resentative i f
add
itio
n
al i
n
formation regardi
n
g
lu
b
ricants or l
u
brication is r e
qu
ire
d
.
Transistor an d Integrate
d
Circuit C
h
ec
k
s
Ch
ec
k
i
n
g t
r
a
n
sisto
r
s a
nd
integ
r ate
d
circ u its as α preve n
-
tive mai n
tenance f
un
ctio
n
is not recomme
nd
e
d
. Ci
r
c
u
it per-
fo
r
mance is t
h
o
r
oug
h
ly c
h
ec
k
e
d dur
i
n
g cali
br
ation ; unac-
ceptable d evices will
b
e d etac h
ed at t
h
at time .
R
ecalibration
T
h
e cali
br
atio
n
stat u s of an instr
um
ent s
h
o
u
l
d b
e deter-
mi
n
e
d
as α part of
pr
eventive mainte
n
a
n
ce fo
r
several
reasons : (1) t
h
e performance of an i
n
strument c
h
a
n
ges
slig
h
tly wit
h
age, use a
nd
operating co
nd
itions ; (2) perfor-
mance may be affected by t
h
e clea
n
i
n
g process; and (3)
c
h
ec
k
i
n
g t
h
e calibratio
n
stat
u
s may reveal tro
ub
les w
h
ic
h
a
r
e
n
ot o
b
vious du
r
i
n
g regula
r
o
p
eratio
n
.
T
h
e calib
r
ation stat
u
s can be dete
r
mi
n
e
d r
a
p i d ly by
accom
p
lis
h
ing t
h
e Pe
r
forma
n
ce C
h
ec
k
contai
n
e
d in
section
five .
Test E qui p ment
T
R
O
UBLE
S
H
OOTI
N
G
T
h
e test e
qu
ipment listed
h
ere s
h
o
u
l
d
s
u
ffice for most
troubles
h
ooti
n
g
j
obs on
t
h
e 7 A 1 1 Amplifier :
H
ig
h
Im
p
e
d
a
n
ce
V
oltmeter ; 10,000 ΩΝ DC o
r
greater .
O
h
mmete
r
; 1-1/2 -
V
so
ur
ce s
u
pplyi
n
g less t
h
an 2 mA
of cu
rr
e
n
t on t
h
e Χ 1
k
scale.
Test oscillosco p e ; 2 MHz ban d
wi
d
t
h
(sampli
n
g oscillo-
sco pe re q
uire
d for t r
o
ub
les
h
ooti
n
g
V
ertical Amplifie
r
h
ig
h
freq ue
n
cy pro
b
lems) .