Tektronix 2235 User Manual

M
ai
n
te
n
ance-2235 Service
el circuit board co nn ectors and t h at t he two
resistors (sol-

3 . U se α 1/16-i n ch H ex- key w r enc h to loose n two
set
dered to t h e b ottom of t h e Atte nu ator circ u it
board) do
not

screws securing t h e Α S E C/DI V dial to t he sh aft
assembly
.
touc h t h e Fr o n t- P an el ci r cuit b oa r d . Pu sh t h e
Attenuator
cir-
c
u it
boar
d forward
and,
at t he
same
time
p
r
ess
t h
e
f r
o
n
t e
n
d
of
t h
e
boar d
down
slig h tly . Align t h
e
two
AC-G
N D-DC

4 . R emove t he following connecto r s from t h
e
Timing
ci
r
switc h
sh afts
wit h t h
e
front- p
anel
h
oles by
moving
eit
h
er t
h
e

cuit board .
C han nel 1 or t he C hann el 2 AC-G N D-DC switc h k
nob .
α . Ρ 9705, an eig h t-wire connector locate d at t h
e rea
r
of
t he Timi ng circuit b oard .
10
.
R
einstall two screws and ground st r a p to t he rear of
t
h
e Attenuator ci
r
cuit boar d ( r emoved in ste p 7) .

b . Ρ 9700, α 10-wi r e con n ector locate d
on
t h
e
rig h
t edge
of t he Timing circuit board .
11 . R
ep lace t
h
e top s
h
ield an d rei n stall t he fo ur sc r ews
an
d
ground
stra p
from
t
h
e
r
ea
r
of t he attenuator b oar d to

5 . R emove o ne screw at t he rear of t he Atte nu ator cir
t h
e top s
h
ield (removed
i n
ste p 6) .

cuit b oard (securing both t he Atte nu ator and t h e Timing cir-
cuit b oards to t he B ottom s h ield) .
12 . R econn
ect
t h
ree co
nn
ectors to t he Atte n uator circuit
b oa rd d isco nn
ected
in
ste p 5 .

6 . R emove t he r emai n i n g t h ree screws securing t he Tim-
ing circuit b oard to t he B ottom sh ield .
13 . P lace t h e inst r ument on its si de and r einstall two
sc r ews to t he sub pa n el (removed in ste p 4) .

7 . Pull t he Timi ng circ u it
board straig
h
t b ack
f
r om t he
fro n t of t he instrument u ntil t he ci r cu it b
oard
i n
tercon
n
ecting
p i ns are disengaged and t he switc h s h aft
is clear of t
h
e
14 . R
esol d er
t h
e resistors to t
h
e C
H 1
a nd CH 2 input

F ro n t- Pa n el circuit b oard .
conn ectors ( d isco nn ecte d i n
ste p 3) .
To reinstall t h e Timing ci r cuit b oa rd , p erform t h
e
follow-
15 .
R
ei
n stall t h
e
two V
O
L TS/DI V k
nobs at t h e p ositio ns

ing steps :
n
oted
i n
ste p
2 .

8 . Insert t he SE C/DI V switc h s h aft t h ro u g h t he h ole i n
t he Front- P a n el circuit board, en su r ing t h at t h e i n te ι con
16 . R otate t he two V aria b le cont r ol sh afts f u lly
cloc
k -

η ecti ng p ins are aligned wit h t h e Fr o n t- Pa n el con nectors .
wise to t h ei r cali br ated dete n t p ositio ns .

P us h t he Timing circ u it b oard forwa r d i n to p ositio n .
17 . R einstall t h e V ariable kn ob s o n to t h ei r sh afts (wit h
lette r i ng h orizo n tal and rig h t-si d e up) and tig h te n t he set
screws .
Timi n g Ci r cu it B oa r d
To remove t he Timi ng ci r cuit boa r d, perform t he following
steps .
1 . U se α 1/16-inc h H ex- key wre nch to loose n t h
e set
screw of t he S E C/DI VV ariable k nob .
9 . R einstall t hr ee screws securing t he Timi ng ci r cuit
b oard to t he b ottom s h ield (removed in step 6) .
10 . R ei n stall t h
e
remai n ing
screw at t
h
e
r
ear of t he At-
tenuator circuit board securing b ot h t he Atte n
uato
r
and t he
Timi ng circuit boa r ds to t h e bottom sh
ield (remove d i n ste p
5) .
11 . R
econnect two conn ectors to t h e Timi n g ci r cu it
board ( d isco nn ected i n
ste p
4) .
12 . R einstall t he Α SE C/DI V dial i n t he p ositio n
noted
in
2 . L oc k t he Α and Β S E C/DI V kn ob s toget h er an d n ote

step 3a nd sec u
re
it wit h two
set screws .
t h e position for rei n stallatio n r eference . U se α 1/4-inc h nu t
driver to r emove t h e n ut sec u ri n g t he Β SE C/DI V knob ; pull
off
t
h
e
k
nob and collet from t he sh aft assembly .

13 . R einstall t he collet and t he Β SE C/DI V k nob
at
t h
e
positio n n oted i n ste p 2 and secure it wit h t he nu t .

Tektronix 2235 Specifications

General

Brand	Tektronix
Model	2235
Category	Test Equipment
Language	English