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HP 435B - Troubleshooting

HP 435B
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Se
rvi
ce
S
ERV
IC
E
S
HEE
T
5
(Cont'd)
N
at
i
o
n
a
l
Bur
eau o
f
Sta
nd
a
rd
s
.
W
h
e
n
sett
in
g
t
h
e
,-
po
w
e
r
l
e
ve
l,
α
t
r
a
n
sf
er e rr
o
r o f
±0
.2%
is
in
tr
o
du
ce
d
Fr
e
qu
e
n
c
y
s
h
aping co
mp
o
n
e
n
ts
R
8,
R
10,
R
11
a
nd
m
a
kin
g
t
h
e
tota
l
e
rr
o
r
±0
.7%
.
If
α
s
y
ste
m
t
hi
s
C8
dete
rmin
e
t
h
e
upp
e
r
limi
t
o
f fr
e
qu
e
n
c
y
r
e-
accur
ate
i
s
a
v
a
il
a
bl
e
i
t
ma
y
be
u
se
d
to
set
t
h
e
s
po
n
se
o f t
h
e
AL
C
loop
w
hi
c
h
pr
e
v
e
n
ts
s
puri
o
u
s
pr
ope
r
ou
t
pu
t
l
e
v
e
l
.
Ot
h
e
rwi
se,
H
e
wl
ett-
P
ac
ka
rd
osc
ill
at
i
o
n
s
.
r
eco
mm
e
nd
s
r
et
urnin
g
t
h
e
Po
w
e r
M
ete
r
so
i
t
ca
n
b
e
r
eset
at
t
h
e f
acto
ry
.
Con
tact
y
o
ur
n
ea
r
est
H
e
wl
ett-
P
acka
rd
o
ffi
ce
f
o
r
m
o
r
e
inf
o
rm
at
i
o
n
.
+5
V
P
O
WER
S
UPPL
Y
A
3
VR
2
pr
o
vid
es
α
r
efe
re
n
ce
v
o
l
tage
o
f
-6
.2
Vd
c
to
t
h
e
powe
r s
upply
r e fe r
ence a
mplifi
e
r
A
3
UL
Th
e
ga
in
o
f
t
h
e
re
f
e
r e
n
ce
a
mplifie
r
i
s
set
by
R
3,
R
4
a
nd
5~
MHz
Osc
i
llator
R
5
a
nd
i
s
a
ppr
o
xim
ate
ly
-0
.8
wi
t
h
R
4
ce
n
te
red
.
M
alfun
ct
i
o
n
s
o
f
t
h
eosc
ill
ato
r
c
ir
c
ui
ts
will
occuras
Th
e
very
sta
bl
e
ou
t
pu
t
i
s
co
upl
e
d
t
hr
o
ughC
R
1
as
α
wr
o
ng
ou
t
pu
t
fr e
qu
e
n
c
y
o
r
as
an
a
bn
o
rm
a
l
o
u
t-
t
h
e r
e
f
e
r e
n
ce
v
o
l
tage
inpu
t
to co
mp
a
r
ato
r
U
2
.
pu
t
l
e
v
e
l .
Th
e
v
o
l
tage
at
ΤΡ
2
will
indi
cate
if
t
h
e
Di
od
e
C
R
1
te
mp
e
r
atur
e
co
mp
e
n
sates
C
R
2
.
AL
C
loop
i
s t
rying
to
co
mp
e
n
sate
f
or
an
in
co
rr
ect
o
u
t
pu
t
l
e
v
e
l
.
T
R
O
UB
L
E
S
H
OOTI
N
G
General
A
L
C
Loop
and
P
ower
Supply
M
od
e
l
435
Β
M
odul
at
i
o
n
o
f
t
h
e
50
MHz
s
i
g
n
a
l
o r s
puriou
s sig-
nals,
whi
c
h
a
r e
pa
r
t
o
f t
h
eo
u
t
pu
t,
ma
y
b
e
ca
u
se
d
by
d
e
f
ects in
R
8,
R
10,
R
11
o
r
C8
in
t
h
e
AL
C
l
oo
p
.
Be
f
o
r
e
t
ryin
g
to
t
roubl
es
h
oot
t
h
e
Α
3
asse
mbly
,
ve
rify
t
h
e
pr
ese
n
ce
of
+12
Vd
c a
nd
-12
Vd
c
on
t
h
e
c
ir
c
ui
t
boa
rd
.
Pr
o
bl
e
m
s
in
t
h
e
AL
C
Loop a
nd
P
o
w
e r
S
upply
c
ir-
If
α
de
f
ect
in
t
h
e
Α
3 asse
mbly
i
s
i
so
l
ate
d a
nd
c
ui
ts
ma
yb
equickly
i
so
l
ate
d
by
m
easuring do
vol-
repaired,
t
h
e
co
rr
ect
ou
t
pu
t
l
e
v
e
l
(1
mW
±0
.7%
ο
)
tages
at
t
h
e
inpu
ts
a
nd
o
u
t
pu
ts
o
f
t
h
e integrate
d
mu
st
be
set
byα
v
e
ry
acc
ur
ate
po
w
e r
m
eas
ur
e
m
e
n
t
c
ir
c
ui
ts
.
F
o
r
a
dd
e
d info
rm
at
i
o
n
on
t
ro
ubl
es
h
oot-
s
y
ste
m
.
H
e
wl
ett-
P
ackard
e
mpl
o
y
s
α
s
p
ec
i
a
l
s
y
s-
in
g
in
teg
r
ate
d
c
ir
c
ui
ts,
r
e fe
r
to
Ge
n
e
r
a
l
Se
rvi
ce
te
m
,
acc
urate
to
±0
.5% a
nd
t
r
acea
ble
to
t
h
e
Inf
o
rm
at
i
o
n
in
Sect
i
o
n
VIII
.

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