Tektronix 2235 User Manual

M ai n te na n
ce-2235 Service
8 . Use α vacuum- d
esoldering tool to un solde r t he
39
wire straps from t he M ain
ci
r
cu it boar d (co nn ecting to t h
e
Fro n t- P anel circ u it boar d ) .
9 . R emove t he F ront- P
anel circuit b oard f r om t he i n str u -
ment and clean t h e wire-st r a p h
oles on t he Main circ u it
b oa
r
d of any remaining sol d er .
To rei n stall t h e Front- P anel circ u it
b oard, p erform t he fol-
lowing
steps :
10 .
Insert and r esolder t h e 39 wire stra p
s on t he F ront-
Pan el circuit
b oard into t h eir correspo nd ing h
oles in t he
M
ai
n
circ u it board (unsol d ered i n step 8) .
11 . Align t h e two ch assis fr ame
assem b lies d isassem-
b led in
ste p 7, ma k i ng s u re t he PO WER
switc
h
extensio n -
s h aft
button is p roperly placed in t he front
pa
n
el .
12 . R
einstall four ch assis-frame securing
sc
r
ews, two
screws secu ring
t
h
e M ain ci r c u it boa rd to t h ec h
assis frame,
and one screw securing
t
h
e delay li n e to t h e ch assis frame
(removed in ste p 6, p
arts b t h roug h e) .
13 . Pus h th
e
F
ro n t- P anel circ u it b oard forwar d
and in-
sert t he con trol
s
h
afts, p ush bu ttons, and t h ree- p
osition
slide switc hes i n to t h eir
correspo nd i n g fr o n t- p anel h oles
.
14 . R einstall t h
ree screws securing t he Fr o n t- P anel
cir-
cu it board to t h e fro n
t- p anel ( r emoved i n ste p 6, p art
α ) .
15 . R esolder t h
e single wire to t he PR O BE AD
JU ST
connector and the two wires
to t heV A RH O L
DO
FF
con trol
( u nsoldered in ste p 5) .
6-18
NOTE

16 . R esol d er t h e resisto r
to t h e ΕΧΤ I NPU T cente r co n -
At t h is p oint,
a
n y
compo n ent on t he Fr on t- P
anel cir-

nector and t he wire stra p
to t
h
e ΕΧΤ I NPU T ground lug
cuit board
may be accessed for removal a nd
replace-

(unsoldered in step 4) .
ment . Sk ip to
step
11
of t h is procedure after
component replacement .
If circuit b oard re p lacement

17
.
R ep lace t he front- p anel kn
obs (removed i n step 3) .
is
Intended,
conti nu e wit h
t he remai n ing d isassembly
ste p s .
18 . R einstall t he B ottom
s h ield, Attenuator, and Timing
circuit- board module (see t h
e p receding rei n stallatio n
p rocedure) .
19 . R einstall t h e crt (see t h e
"Cat h ode- R ay Tube"
reinstallation p roce d ure) .
M ain
Ci r cu it B oa rd
All com p one n ts on t he Main ci r cuit b
oard are accessi b le
NOTE

eit h er
directly or by removing eit h er t he crt, t h
e
B
ottom
If α vac u um-desol d ering tool
is not availa b le, lift eac h

shiel
d , Attenuator, Timi ng circuit- b oar d module,
or
t h
e Ροω -
st
r
a p out of t he Main circuit b
oard as t he j oint is

er-Su pp ly sh iel d . R emoval of t he M ain
ci
r
cuit b oa r d is re-
h
eate d .

q
uired
only w hen it is necessary to re p lace t he
boa
r
d wit h α
n ew
one .
To remove t he Main circuit b oard, p erform t he following
steps
:
1 . Disconnect
t
h
e t h ree-wire ΒD EL AYTIME POSITIO N
potentiometer
con
n
ector ( Ρ 4644) from t h e Mai n circ u it
b oard (locate d in f r
o
n
t of t he Power-Supply sh ield) .
2 . R emove
t
h
e Alt Sweep circ u it boar d (see "Alt
Swee p
Circ u it B oard" removal p
roce d ure) .
3 . R emove t he Power-Sup
p
ly
sh ield and p lastic p ower-
su pply cover
(see "
P
ower-Su pp ly S h ield" removal
pr oced u re) .
4 . Unsold er five wires from t h
e
F
ilter circuit b oard (lead-
ing to t he M ain circ u it b oard) .
5 . R emove connectors from t h
e Atten u ator a nd Timi ng
circ u it boards, noting t h eir
locatio
n
s for r ei n stallatio n
reference .
6 . R emove t he F OC U S cont r ol
s
h
aft assembly b y p u lli n g
it straig h t out from t he front panel .
REV ΜΑΥ 1983

Tektronix 2235 Specifications

General

Brand	Tektronix
Model	2235
Category	Test Equipment
Language	English