Tektronix 576 - Troubleshooting Procedures

Sig n ifi-
Mu lti p lie r I Tolerance
ca n t R esis-
Ca p aci- Resis- Capaci-
Colo r F ig ur es tons to r s Ι
toys

tors
R esisto
r an d
Ca
p acitor Colo r Co d e
10 2
10 2
±2%
±2%
10 3 1
10 3 1 ±3%
r±3%
* F or ca p acitance of 10 pF o
r
less .
(DO
a
nd

3 Ο

1 st, 2 d an d3 r d sig n ifica
n t
fig ur es- ;
Ο -m u lti p lie r ; Ο -tole r an ce
;
@
-tem pe r at ur e coefficient .

NOTE : (D a n d/o r
Ο .
colo r co d e fo r ca p
ac i to r s dep e nd s
upon
m a nu fact ur er a n d capacitor ty pe . May not be pr esent
in some
cases .
coded blue or p i nk
-brown-grey-green in d icates Te k tronix
P art N umber 152-0185-00) . T
h e cat hode a n d ano d e en d s of
metal-encase d d iodes can be i d entifie d by t he d iode
symbol
mar ked on t h e body .
T r a n sistor an d Integrate d Circuit L ea d Co n figuration .
F
ig .
4-2
s
h
ows
t he lea
d
configurations of t he transistors
an d integrate d circuits u se d in t h is instrument .
T h
is view
is
as seen from th
e
bottom of t h
e
d
evice .
Troubles h ooting
Eq
ui p
ment
T he following eq ui p ment is useful for troubles
h
ooti
ng
t he Ty p e 576 :
1 . Semiconductor Tester-Some mea
n
s of
testing t h e
transistors, d io d es an d FE Ts use d
in t h is i n strument is h el p -
ful . Α transistor-curve tracer suc
h as t he Te k t r onix Ty p e
576 will give t h e most com p lete information
.
2 . DC V
oltmeter and O h mmeter- Α
voltmeter for
c h ec k
ing voltages wit h t h e circuit an d an o
h mmeter for
c h ec k ing resistors
an
d d io
d es are re q uire d . F or most a pp
li-
cations α 20,000 oh m/volt VO M ca
n be use d to ch ec k volt-
ages and resistances, if allowances are ma
de for t h e circuit
Fi g . 4-1 . Color-code f o r r es i sto
r
s
and ceram ic
capacitors .
M ainte na n ce-Ty p e 576
loa d i n g of α VOM wh en ma k ing voltage measureme
n ts at
h ig h -im pe d ance p oi n ts .
3 . Test
Oscillosco p e- Α test oscillosco pe is require d to
view waveforms at different p oi
n ts i n t he ci r cuit . An
oscillosco pe with DC to 10 MH
z fre
q uency res
p onse and 10
m V to 10 V / d ivision vertical d eflection factor is
suggeste d .
Α 10 Χ probe s
h
ould
be used
to
re duce circuit loa d ing .
Troubles h ooting Tec h ni q ues
T h is troubles
h ooting procedure is arrange d in an or d er
w h ic h ch ec k s t
h
e simp le trouble p
ossibilities before p ro-
cceding wit h extencivo troubles h ooti ng . T h e first few
ch ec k s ens u re
p ro p er connection, op eration and calibration .
If t
h
e trouble
is not locate d by t h ese ch ec k s, t he remaining
ste p s ai d in locating t he d efective com
ponent . Wh en the
d efective com p on ent is locate d , it s h oul d be re p lace d fol-
lowing t he
replacement p roce
d
ure given under Corrective
M aintenance .
1 . Ch ec k Co n t r ol Settings . Incorrect control
settings
can i nd icate α trouble t h at d oes not exist . If
t h ere is any
q uestion about t he correct function or op eratio
n of
any
control,
see t he O p erating Instructions sectio n of t h is
manual .
4-
3
Yellow 4 10 4
10 4
±4%
+100%
-0
Green 10 5
10 5 ±0 .5% _-L5 0 / . or
0 .5 pF *
B l u
e
~
- 6-
10 8 1
6
V
iolet
Ι
7
1
---
G r
ay
8 --- 10-2
+80%
-20%
or 0 .25 p F *
Wh ite 9 ---
10-1
±10%
or
1 p F *
( n on e) ±20%
±10% o r
1 p
F *