Tektronix 7704A User Manual

Maintenance-7704A Service
F ig . 3-5 . L ocatio n of Ρ 4315 and Ρ 4316 on Α 43, H orizo n tal Output
boar d .
Corrective maintenance consists of
com ponent re p lace-
ment an d instrument
re p air . Special tec h ni q ues re q uire d to
replace
com p onents in t h is instrument are given h ere .
Sol d ering Tec
h
ni
q ues
T
h e reliability
an d accuracy of t h is instrument can be
maintaine d only
if p
ro p
er sol d ering tec h ni q ues are use d
w h en repairing or re
p
lacing
p
arts .
General sol d ering tec h -
ni q ues w h ic h apply to
m aintenance of any p recision
electronic
eq ui p ment s h oul d be use d w h en wor k ing on t h is
instrument . U se only 60/40 rosin-core, electronic- gra d
e
solder
. T he c h oice of sol d ering iron is d etermine d by t
he
re p air
to
be
ma
d e . Wh en sol d ering on circuit boar d s, use α
35- to 40-watt p
encil-ty p e soldering iron with α 1/8-inc
h
wi d e, we d ge-s
h
ap
e d ti p . K ee p t h e ti p properly tinne d
for
b est h eat transfer to t h e sol d er j oint .
Α
h
ig h er wattage
sol d ering iron may se p arate t
h e wiring from t he base
material
. Avoid excessive h eat ; apply only enoug h h eat to
3- 1 0
CO RRE CTI VE M AI NT E N A
N
C
E
W A RN I N G
Disconnect t h e instrument from t h e powe r source
before soldering .
remove t h e com p onent or to ma
k e
α
goo d sol d er j oint .
Also, apply only
enoug h sol d er to ma k e α firm sol d er j oint ;
do
not apply too muc h solder .
)
CA U TIO
N C
. . .
Seve r al of t h e
circuit b oards in t h is instrument are
m ulti-layer type
boards wit h α conductive pat h (s)
laminated
between t he top and bottom board layers .
All
soldering
on
t h ese boards should be done wit h
extreme care to
prevent b r ea k ing t h e connections to
t he center
conductor(s) ; only expe r ienced main-
tenance personnel s
hould attempt repair of t h ese
b oards .
F
or metal
terminals (e .g ., switc h terminals, p oten-
tiometers, etc .), α
h ig h er wattage-rating sol d ering iron may
be
re q uire d . M atc h t h e soldering iron to t he wor k
bei n g
done .
F
or example,
if t h e com p onent is connecte d to t he
c h assis or ot
h er
large
h eat-ra d iating surface, it will re q uire α
75-watt or larger
sol
d
ering iron . T he p encil-ty p e soldering
iron use d on t h e circuit board
can be use d for sol d ering to
switc h terminals,
potentiometers, or metal terminals
mounted
in p lastic h ol d ers .
Com p onent R e p lacement
I W A RN I N G
Disconnect t
h
e
instrument from t h e power source
before replacing
components .
General . T he exp lo d e d -view d
rawing associate d wit h t h e
M ec h anical P arts L ist (Section
7) may be h el p ful in t h e
removal or d isassembly of
in d ivi d ual com p onents or sub-
assemblies
. F igure 6-2 i n t he
Diagrams section s h ows t he
location of circuit boar d s wit
h in t he 7704 Α .
P ower- U nit R emoval . T h e p ower u nit can be slid
out
of
t he rear of
t h e 7704 Α to gain better access to
the L
ogic
circuit boar
d an d for p ower-unit maintenance . To
remove
t
he
p
ower unit, first remove t he four screws w h ic
h
h ol d t
h e
power unit to t h e rear frame of t
h e instrument . Sli d e t h e
p ower unit out of t
h e rear of t h e instrument until it can be
set on
th e wor k surface (guid e t h e cables so t
h
ey d o not
catc
h
on
ot h er p arts of t he instrument) . T he power unit
remains
connecte d to t h e rest of t h e instrument so it can be
op erate
d in t h is p osition for troubles h ooting .
R everse
t
h
is
p roce d ure w h en re p laci n g t h e p ower unit ; be
careful not to
p inc h t he p ower cables as t
he p ower unit is re p lace d . B e
sure t h at all t he
securing screws
are
tig h t to h ol d t h e power
unit in p lace p ro p erly .

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English