Tektronix 7704A User Manual

h elpful in localizing certain troubles
in t h e i n strument . In
some cases,
minor troubles may be reveale d and /or cor-
recte d by recali b ration .
T he following information is p
rovi de d to facilitate
troublesh ooting of t he 7704 Α
. Information contained in
oth er sections of th is
manual
s
h
ould
be used along with t h e
following
information to aid in locati n g t h e d efective
component . An u nderstan d ing of t he circuit operation is
very h el p ful in locating troubles, particularly w h ere
inte-
grated
circuits are used .
Troublesh ooting Eq ui p ment
1 . Transistor
Tester
T R O UBLE S
H
OOTI
NG
T h e following e q uipment is
useful for troublesh ooting
t he 7704 Α .
Descri p tion :
Dynamic-ty p e tester . M ust be capable of
measuring
reverse b rea k dow n voltages of at least 400 volts .
P urpose : To test t h e semicon d uctors
used in t h is
instr u ment .
Recommended type : Te ktronix Type 576 Curve Tracer
.
2 . M ultimeter
Descri p tion : VT VM, 10
mego
h
m
in
p
ut im
p edance
an
d 0
to 500 volts range, AC an d DC ; o
h mmeter, 0 to 50
mego h ms . Accuracy, wit
h i n 3% . Test pro b es must b e
ins u lated to
prevent accidental s h orting .
P urpose : To chec k voltages and for general tro ub le-
s h ooting
in
t
h is instrument .
ΝΟΤΕ
Α 20,000 ohmsl νο lt V OM can be used to
check the
voltages in this instrument if allowances are
made for
t he circuit loading of the
V
OM at
h igh-impedance
points .
3 . Test Oscilloscope
Description : F re q uency res po n se, DC to 100 mega h
ertz
minimum ; d eflection factor, 5 millivolts to 5 volts/division
a nd 1 milliampere to 1 ampere /division .
Α 10 Χ ,
10-mego h m voltage p robe s
h oul d b e used to reduce circuit
loa d
ing
for
voltage measurements .
Purpose : To check op erating waveforms in t h is instru-
ment .
Recommen ded type
: Te ktronix 7603 Oscillosco p e with
7
Α
16
Α Amplifier, 7 Α 14 Curre n t P robe Amplifier, and
Maintenance-7704A Service
71350
TimeB ase p lug-in units . U se α
Ρ 6053 10 Χ pro b e and
α Ρ 6021 Current Pro b e .
4
.
Isolation
Transformer
Description : 1 :1 tur
n
s
ratio, 500 volt-amperes
mini-
mum
rating, 50-60 cycle . Mu st h
ave
t
h ree-wire p ower cor d ,
plug, and receptacle wit h gro
un
d
con nection carrie d
t h roug h from in pu t to out p ut .
Pu r pose : To isolate t
he 7704 Α from t he line pote n tial
w h en trou b les h ooting
in t h e p ower s u pply .
Recomme n ded type
: Stancor No . Ρ6298 (for 115-volt
line only) mo d ifie d to
inclu
d
e
t
h ree-wire power cor d , pl u g,
an d recep tacle .
5 . V aria b
le Autotransformer
Description : Output varia b le from 0 to 140
volts, 10
am p
eres minimum rating . M ust have th ree-wire
power cord ,
p lug, an d
receptacle .
Purpose : To vary t
he input li n e voltage w hen trou b le-
s h ooting
i n
t
he p ower supply .
Recommen de d ty p e :
General Ra d io W10M T3 W V ariac
Autotransformer .
Troubles hooting Tec h ni q
ues
T h is tro u bles h ooting proce
dure is arrange d in an
order
w h ic h check s t h e
simple trou b le possi b ilities b
efore p r
o-
cee d ing with extensive
trou b les h ooti ng . T h e
first few
check s assure pro p er
connection, o p eration, a
n
d
cali b ra-
tion
. If t he tro u ble is not
locate d by t hese
c heck s, t he
remaining steps aid in
locating t h e defective
component .
Wh en t he defective
component is located, it s
h
o
u l d b e
replaced following t
he re p laceme n t proced ures give
n un d er
Corrective M ainte
n ance .
1 . C
heck Cont r ol Setti ngs . Incorrect
control settings can
in d icate α
trouble t h at does not exist .
If t here is any
q uestion a b out t
he correct function or o p
eration
of
any
control, see t h e O
p erators
Manual .
2 .
C h ec k Associate d Equip me
n t . B efore procee d ing wit
h
trou b les h ooting of t h e 7704
Α , check t h at t he e qu i
p
ment
used with t h is i n strument is
operating correctly . C heck t
h
at
t
he signal is properly connecte d and
t h
at
t he interconnecting
ca b les are not d efective
. Also, check t he power
source . T h e
associate d plug-in
un
its
can be checked for pr oper operatio
n
by substituting ot
h er u n its w h ic h are known to be
oper-
ati ng properly (prefera
b ly of t h e same types) .
If t he tro ub le
persists
after substitutio n , t he 7704
Α is proba b ly at fa u lt .
3-3

Tektronix 7704A Specifications

General

Brand	Tektronix
Model	7704A
Category	Test Equipment
Language	English