Tektronix 2235 User Manual

7 . R emove t h e P O WER switc h extension-s h aft assem-

16 . U se α vacuum-desoldering tool to un sol d er t he 39
b ly by first pressing in t he P O WER b utton to t he ON posi-

wire stra p s (connecting t he M ain circuit b oa rd to t he F ro n t
tion . T hen insert α scribe (or similar tool) into t h e notc h

P anel circuit boar d ) from t he M ai n circuit board .
b etween t he end of t h e switc h s h aft a nd t he end of t h e
exte n sion sh aft a n d gen tly pr y t he conn ectio n apart . Pu
s
h
t he extensio n s h aft fo r war d , t hen si deways, to clear t h e

NOTE
switc h s h aft . F inally, pull t h e extension sh aft back and out of
t he instrument .

if α vacuum-desol de r ί ng too/ is not available, lift eac h
wire stra p out of t he M ain circuit b oa rd as t he j oi n t is
h eated . U se care to mai n tai n , as n early as possi b le,
8 . Disco nn ect Ρ 9001 and Ρ 9002 from t he rear of t he

the o r igi n al s h a p e a nd s p aci n g of t he wire straps to
M ai n circuit b oa r d n ea r t he fuse h ol de r .
facilitate r ep/aci n g t he ci r c u it boar d .
9 . U nsol d er t he rear- p anel ΕΧΤ Ζ AXIS connector wire
from t he M ain ci r cuit board .
10 . R emove two screws secu ri ng t he power-s upp ly tra n -
sistor h eat-sin k assem b ly (at t h e rig h t side of t he c h assis
frame .
M ai n te n an ce-2235 Service
17 . P ush t h e wire-stra p conn ectio n e nd of t he M ai n cir-
cu it b oard d own u ntil it is clear of all wire stra p ends ; t hen
remove it t h roug h t he b ottom of t he i n str u me n t frame . En-
sure t h at t he wire st r ap s are n ot b en t ou t of p lace .
To replace t he M ain circ u it boar d , u se t h e followi n g
p rocedure :
18 . P lace t he M ain ci r c u it b oa rd i n to t he c h assis frame,
W A RN I N G

ens u ring t h at t h e boa rd is i n t h e gu i d
es at
t h
e rear a
n
d
rig h t
side of t he frame and t h at t he 39 wire straps a r e i n serte d
i n to t h eir corres p onding h oles .
Th e crt anode lead and t he output terminal to t he
H ig h - V oltage M ultiplie r will r etain a high-voltage
c h arge after t he inst r ument is turned off To avoi d

19 . R einstall t hr ee sc r ews securing t he M ain ci r cu it
electrical shoc k , ground t he crt side of t he anode lead

boa r d to t h e ch assis frame (removed in ste p 15) .
to t he mai n i n stru me n t c h assis .
20 . R esol de r 39 wire stra p s to t he M ai n circ u it board .
11 . Disconnect t he crt anode lead from t he H ig h - V oltage
M ultiplier anode lead by ca r efully pulling t h e anode pl ug o u t
of t h e j ack . Disc h arge t h e plug tip to t he c h assis .

21 . R einstall t h ree sc r ews h olding t he b ottom s h ield to
t he M ai n circ u it b oa rd (remove d i n ste p 14) .
12 . U nsol d er two sets of crt soc k et wires from t h e M ai n
circuit b oard, noting wire color and position fo r reinstallatio n 22 . R esolde r two sets of delay-line wires at t he locations
r eference .

noted in ste p 13 .
13 . U nsol d er two sets of d elay-line wires from t he M ai n 23 . R esol d er two sets of crt soc k et wires at t h e loca
circ u it boar d , n oti n g wire color and p ositio n for rei n stallatio n tions n oted in ste p 12 .
r eference .
24 . R eco nn ect t he crt a n od e lea d to t he H ig h - V
oltage
14 : R emove t h ree screws securing t he B ottom sh ield to

M ultiplier anode lead (disco nn ect in ste p 11) .
t he M ain circuit board .
25 . R einstall two securing screws in t h e powe r -supply
15 . R emove t h ree screws securing t he M ain circuit

t r ansistor h eat sin k assembly (removed in step 10) .
b oard to t he instrument ch assis f r ame (one unde r t he ΕΧΤ Ζ
AXIS connector and two alo ng t h e left side of t he M ai n cir-
cuit board) .

26 . Insert and resolder t he ΕΧΤ Ζ AXIS connector wire
into t he M ain circuit board (removed in ste p 9) .

Tektronix 2235 Specifications

General

Brand	Tektronix
Model	2235
Category	Test Equipment
Language	English