Tektronix 576 - Section 4 Maintenance

Introduction
T h is section of t he ma n ual provi d es informatio n for use
in p reve n tive mai ntenance, troublesh ooting and corrective
maintenance of t he Ty p e 576 .
General
Preventive mai n te n ance con sists of cleaning, visual
ins p ectio n , lubricatio n , etc . P reventive mai n te n a nce p er-
forme
d on
α regular basis will improve t h e reliability of t h is
instrume n t . T he severity of t he environ mee n t to w h ic h t he
Ty p
e
576
is s ub j ected d etermi n es t he frequency of main-
te n ance .
Cleaning
T h e Typ e 576 s hould be cleaned as ofte n as op erating
con d itio n s re q uire . Accumulatio n of dirt in t h e instrument
can cause over h eating an d com p one n t break down . Dirt on
com p onents acts as an insulating blan k et an d preve n ts
efficient h eat d issipatio n . It can also provide an electrical
con duction p at h .
Exte r io r . L oose d ust accumulated on t h e outsi d e of t he
Ty p
e 576 can be remove d wit h α soft clot h or small p ai n t
brus h . T h e p ai n t brus h is p articularly useful for d islo dging
d irt on and around t he front panel co n trols . Dirt w h ic h
remai n s can be remove d wit h α soft clot h d am pened i n α
mild d eterge n t a nd water solution . Abrasive
cleaners s
h
o
u l d
not be used .
Interior . D u st in t he interior of t h e instr u ment s hould
be remove d occassionally to p reve n t electrical cond u ctivity
u
n der h ig h - h umi d ity cond itions . T he best way to clean t he
interior is to blow ou t t h e accumulated du st wit h d ry, low-
velocity air . Remove any
dirt w h ic h remains with α soft
p aint brus h or α clot h d am p ene d with
α
mild deterge
n
t a
n
d
water solution
. Α cotton-ti pped app licator is useful for
cleaning
in
narrow
s paces
or
for clea n ing ceramic terminal
stri p s a
n
d circuit boards .
Avoi d t he u se of c h emical cleaning agents
w h
ic
h
mig h t d amage t he p lastics used i n t h is i n strume
n t .
Avoi d ch emicals w h ic h co n tai n
b
en ze n e, tolue n e,
xylen e, acetone or similar solvents .
L ubricatio n
PREVEN TI VE M AI N T EN AN C E
CAUTION
T h e reliability of p otentiometers, rotary switch es, an d
oth er movi n g p arts can be maintained if t hey are ke p t
S E CTIO N 4
M AI N T EN A N C E
C h ange informatio n , if any, affecti ng t h is sectio n will be found at t he rear of t h is ma n ual .
Ty pe 576
p ro pe r ly lubricated . U se
α cleani n g-ty p e lubricant
(suc
h as
Te ktron ix Part Νο . 006-0218-00)on s
h
aft bus
h
ings a
n
d
switc
h
contacts .
L ubricate switch d etents with α h eavier
grease (suc h as Te ktronix Part Νο . 006-0219-00) . Potentio-
meters t h at are n ot sealed s h ould be lubricate d wit h α lubri-
cant
w
h ic h will
n
ot
affect elect r ical c h aracteristics (suc h as
Te k tronix
P
art Νο .
006-0220-00) .
Do not use
excessive lub-
rication . Α l u brication kit containing t
h
e necessary
lubri-
cants and i n structions is available from Te k tronix, Inc .
(Ord er Te ktronix P art Νο . 003-0342-00) .
V isual Ins p ection
T h e Ty p e 576 s
h
ou
l
d
be ins p ecte d occasionally for such
d efects as bro ken conn ections loose p
in connections
brok en or d amage d ceramic stri p s, im p r op e r ly seated tra
n -
sistors,
damage d ci r cuit boar d s and h eat damage d p a rts .
T he corrective
p rocedure
for
most visible defects is
obvious ;
h owever, p articular ca r e must b e ta ken if h eat-
d amaged com
p one n ts are found . Over h eating usually
in d icates ot
h er trouble i n t he instrume n t ; t h erefore, it is
im portant t
h at t he cause of overh eating be corrected to
prevent recurrence of t he d amage .
Transistor
an d Integrate d Circuit
Pe
r iodic c
heck s of i nd ivi d ual transistors an d integrate d
ci r cuits are
n
ot
recomme n
d
e
d . T
he best check of t h em is
t h eir o p eration i n t h e eq ui p ment, as reflecte d by α p erform-
ance check o r calibration p rocedure . Sub-stan d a r d p e r form-
ance will normally be d etecte d at t hat time .
R ecalibration
To ensure accu rate meas u reme n ts, check t he calibration
of t h is instrument
after
eac h 1000
h
ours of o p
e r
ation or,
if
u se d i nfrequently, every 6 mo n t h s . In add itio n , re p lace-
ment
of
components may n ecessitate reacalibration of t he
affecte
d
circuits . Complete calibration instructions are
give n i n t he P e r fo r ma nce C h ec k and Cali br atio n section .
T h is proce du re may also be h el p ful in localizing certain
t r oubles in t he i n strume n t . In some cases, minor troub les
may be revealed and/or correcte dby recalibration
.
T ROUBLE S
H
OOTI
N
G
Introduction
T he following
information
is p
rovi d
ed
for use wit h t he
ot h er sections of t h is manual to facilitate trou b les h ooti ng
of
t he
Ty p
e 576 if trouble develo p s . An u nderstand ing of