Tektronix 2235 User Manual

M ainte n ance-2235 Service
14 . R ei n stall t he SE C/DI
V V
a
r
iable
kn o b on to its sh aft

reinstallation p rocedure and steps 11 t h ro ugh
14
of t
h
e
(wit h lettering h orizontal and
rig h t-si de up) an d tig h te n t he

"Timi ng Circ u it B oard" reinstallation p roce du re .
set screw .
B ottom S h iel d , Atten u ato r a
n
d
Timi ng Ci r c u it-
B oard M o du le
R emoval of t h e module consisting of
t h
e
B ottom sh ield
and t he Attenuator and Timing
circuit
boar
ds is accom-
p lis hed b y t he following ste ps :
1 . P erform ste ps 1 t h roug h 5 und er t
h
e
"Attenuator Cir-
cuit B oard" removal p rocedure .
2 . P erform ste p s 1 t h ro ug
h 4
unde
r t h e "Timi n g Circ u it
B oard" removal
.
3 . P lace t h e instrument on its side
and remove fo u r
screws h olding t he B ottom s h ield to t
h
e
M ain circ u it b oa r d .
4 . Pull t he B ottom sh iel d , alo ng wit h th e Atten uato
r
and
Timing circ u it b oards straig h t b ac k from t h e front of t
h
e
in-
str u ment until t h e i n terconnecting p
i n
s on bot
h circ u it
boards are disengaged and t he switc
h
s
h
afts are
clear of
t he h oles in t he F ro n t- P anel circ u it board ;
t h
en
lift ou t t h e
entire assem b ly t h ro ugh t
h
e top of
t he i n strument .
5 . If accessi b ility to t he bottom of
eit h
er
t he Attenuator
or t h e Timing circuit board is d esired
refer
to
ste ps 6 and 7
of t he "Atten u ator Circuit B oard"
removal proced ure and to
ste p s 5 and 6 of t he
"Timing Circ u it B oard" r emoval
procedu re .
To reinstall t he B ottom sh iel d -Atte
n uator-Timing assem-
bly, perform t he following ste ps :
6 . If o n e or bot h of t
h
e
circuit
boar
ds was removed, rei n -
stall t he ci r cuit boar d (s) to t h e B ottom s
h
ield b y refe
r ring to
ste p s 10 and 11 of t he "Atte nu ator
Circuit B
oard "
rei n stallatio n p rocedure an d to ste p s 9 and 10
of t h e "Tim-
i ng Circuit B oa r d" reinstallation p rocedure .
7 . Insert t he t h ree switc h s h afts t h ro u gh t he h oles in
bot h t he F ro n t- P an el ci r cuit boar d and t he fro n t pa n el (refer
to t he "Atten u ator Circ u it Board " a nd the "Timing Circ u it
B oar d " rei n stallatio np roce du res) .
8 . R einstall t h e four screws h olding t he B ottom sh ield to
t he M ain circuit boar d (remove d in ste p 3) .
9 . Com p lete reinstallation of t h e module by p erfo r ming
ste ps 12 t h ro ugh 17 of t he "Atte nu ator Circ u it B oard"
Fr on
t-
Pan
el
Circ u it B oard
1 . R
emove
t h
e
crt (see t he "Cat h ode- R ay Tube" removal
p roce
du re) .
2 . R emove t he B ottom s h iel d , Atte n uator, and Timing
circuit- b oard module (see
t he p receding removal p roce dur e) .
3 .
R emove t he k nobs from t he following control sh afts
b y p ulling t h em straig h t o u t f r om t h e front p anel :
α . Ch annel 1 and C h annel 2 P OSITIO N ,
b .
Α / ΒS WP SEP,
c .
H orizontal P OSITIO N ,
d .
Α TR IGG ER LEVEL,
e . Β TR IGG
ERLEVEL .
4 .
U nsolder
bot h t he resistor to t he ΕΧΤ I NPU T ce n te r
con n ector and t h e wire stra p to t h e ΕΧΤ I NPU T ground l ug .
5 . U nsolder
t h
e
single wi r e from t he PR O BE AD JU ST
connector an
d t he two wi r es from t he V A RH O L DO FF con-
trol
(leading to t h e F ro n t- P anel circuit boar d ) .
6 . R emove
t h
e
following screws :
α .
Th
ree
screws securing t he u pp er p art of t he F ront-
P anel circuit b oard to t he front p an el .
b . Two recessed
frame-secu r i ng screws at t h e left-rear
corner of
t h
e c
h assis frame .
c . Two screws
h ol d i ng t h e M ain circuit boar d to t he
c
h
assis
frame
.
d . One screw secu ri
n g
t
h
e delay
line
to
t h
e
ch assis
frame on t h e left side of
t h
e
instr
u me
n t .
e . Two recessed
frame-securi ng screws at t he rig h t
front
corner
.
7 . Pull t he front-left frame assembly a p art from t he r ea r -
rig h t frame assem b ly .

Tektronix 2235 Specifications

General

Brand	Tektronix
Model	2235
Category	Test Equipment
Language	English