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Se rvi ce
M
o del 435 Β
8-4
Soldering
Unsold ering
Unsold ering
Aid
Ι from conn ection
Resin (fl ux)
Solder
Protective
coating
R
emove e xcess flux fro m
soldered area before
application
o
f protective
coating.
Component
r
epl acement
Circuit
b
oard repa ir
W
iring
corrosi on protection
Next, ch eck
t
he amplifier 's o u tput
v
o l tage. It will
probably
a
lso
b
e close to one of
t
h e s upply voltages
(e.g., ground, +12V, or -12V) . Ch ec k to see th at the
output conforms to the inputs.
F
or
e
xampl e, if
t
h e
inverting input is
m
ore
p
os i t iv e t h an
t
h e non-
inverting input, the output should be
n
egat iv e; if
t
he non-inverting input is
m
or e
p
osi tive th an
t
he
inverting input, the output should be
p
ositive. If
t
he
output conforms to the inputs, check
t
he amplifier's
external
c
ircuitry. If
t
he amplifier's output
d
oes
n
ot
conform to its inputs, it is probably defect ive .
Ta
b
le 8-1 .
E
tc
h
e
d
Circ
u
it Sol
d
ering
E
q
u
ipment
S
p
ecificat i on .----~ -
Item
R
ecommen
d
e
d
W
attage
r
at ing : 47 1/2-561/2
Un gar No. 776
h
andle with
Tip Te mp : 850-900
d
egrees
* Ungar No. 4037
H
eating
Uni t
Soldering tip*
Ι Soldering
Ι *Sh ape:
p
ointed
Ι
*
Ungar No. PL 111
Suction device
So ldapult b y Eds yn Co.
Arleta, California
Must
n
ot dissolve etche d
c
ir-
Freon,
A
ceton,
L
ac qu er
c
uit
b
ase
b
oard material
o
r
Thinner,
I
sopropyl Alcohol
conductor bonding agent.
(100%ο dry)
R
esin (fliιx) cor e, high tin
co ntent (60/40 tin/lead),
18 gauge (SWG) preferre d
Contamin ati on,
Ι Goo d el ectrical ins ul ati o n,
Ι Sili con e
R
es in
s
uc h as
corrosi on-prevention pr op erties Ι GE DRI-FILM **88 -~
*
Forworkingon etched boards ;
f
or general purpose work,
u
se Ungar No. 1237
H
eating Unit (37.5
W
, tiptemperature of 750-800degrees) and
Ungar No. PL113, 1/8-inch chisel tip .
**General Electric Co ., Silicone Products Dept., Waterford,
N
ew York,
U
.S.A .
Operational Amplifiers (Cont'd)
Figures 8-2, 8-3, a nd 8-4 sh ow
t
ypi ca l
o
pe rat iona l
When troubleshooting an operational
a
mplifie r
c
ir-
ampli fier co nfigurat i o n s . Fi g ure 8-2 s h o w s α ηοη -
cuit,
m
easure the
v
oltages at the two inputs ; th e
inv ert ing buffe r
a
mplifi e r wi t h α ga in
o
f 1 . Fig ur e
difference
b
etween
t
hese
v
oltages should be less
8-3 is α non-inverting amplifier wit h ga in d ete r-
than 10 mV. (Note : This troubl es hooting procedure
mind ed by R 1 and R2. Figure 8-4 is an inverting
will not
w
ork for
o
peration al
a
mplifiers whic h
a
re
amplifier with α gain d etermin ed by R 1 and R 2 .
configured as comparato rs .) Α differe nce
v
ol tage
muc h
g
reater
t
han 10 mV indicates troubl e in
t
h e
amplifie r
o
r its external
c
irc uitry.
U
s ually, this dif-
f e r ence w ill b e severa l volts and
o
n e of
t
h e inpu ts
will b e
v
ery
c
lose to on e o f
t
h e s upply vo l tages (e.g.,
+12V
o
r -12V).
I
NPU
T
I
NPU
T I
MPE
DA
N
C
E-VER
Y
H
IG
H
OU
T
PU
T I
MPE
DA
N
C
E-VER
Y
L
O
W
F
ig
u
re 8-2 . Non-inverting Amplifier (Gain =1)
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