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HP 435B Service Manual

HP 435B
119 pages
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Se
rvi
ce
S
ERV
IC
E
S
HEE
T
4
(Cont'd)
Wh
e
n
t
h
e
lin
e vo
l
tage
i
s re
m
ov
e
d
,
CR
7
i
s
f
o
rw
a
rd
.-
bi
ase
d
by
t
h
e
curre
n
t
flo
win
g
to
t
h
e
P
owe
r
M
ete
r
b
eg
in
s
to
t
urn
o
ff
.
Th
e
co
ll
ecto
r
vo
l
tage
b
egin
s
to
c
ir
c
ui
ts fr
o
m
t
h
e b
atte
ry
.
CR
6
i
s
t
urn
e
d o
ff
andno
go
p
os
i
t
iv
ea
nd
t
h
e
c
h
a
n
ge
i
s tr
a
n
s
mi
tte
d
t
hr
ou
gh
curr
e
n
t flo
w
s
t
hrou
gh
t
h
e
c
h
ar
g
in
g
cir c
ui
t
.
R
51 a
nd
VR
5
to
Q18
.
A
s
Q18
b
eg
in
s
to
t
urn
off,
i
ts
co
ll
ecto
r goes
m
o
r e
n
egat
iv
e
.
Α
n
egat
iv
e
go
ing
Current
L
ί
m
ί
ter
.
t
r
a
n
s
i
e
n
t
i
scouple
d
t
hro
ugh
R
55
to
t
h
e
b
aseo
f
Q
14
whi
c
h
sp
ee
d
s
up
t
h
e
t
urn
-o
ff t
im
e
.
Th
e
p
os
i
t
iv
e
If
t
h
e
curr
e
n
t
flo
w
t
hr
ou
gh
t
h
e24
V
r
eg
ul
ato
r
w
e r
e
s
upply
v
o
l
tage
i
s r
e
m
o
v
e
d
fr
o
m
t
h
e co
ll
ecto
r
of
to
s
udd
e
nly
in
c
r
ease
to
a
ppr
o
xim
ate
ly
90
mA,Q15
Q18
a
nd
al
so
t
h
e
DC
Amplifi
e
r
.
A
s
t
h
e
b
atte
ry
w
o
uld
t
urn
ona
nd
dr
aw
t
h
e d
r
iv
e
curre
n
t
a
w
ay
v
o
l
tage
i
s
fur
t
h
e r r e
du
ce
d,
t
h
e
se
ri
es
r
eg
ul
ate
d
fr
o
m
Q16
.
Co
n
se
qu
e
n
t
ly
,
t
h
e
c
u
r r
e
n
t
flo
w
to
Q13
ou
t
pu
t
b
eg
in
s
to
d
ec
r
ease
f
aste
r
t
han
t
h
e
b
atte
ry
w
o
uld
di
sa
ppea
r
and
t
h
e r
eg
ul
ato
r
o
u
t
pu
t
w
o
uld
v
o
l
tage
and, e
v
e
n
t
u
a
lly,
t
h
e
3 vo
l t
t
hr
es
h
o
ld
vo
l t-
b
e
r
e
du
ce
d
.
age
i
s
e
x
ceed
e
d
.
Q14
i
s
t
h
e
n
bi
ase
d
on,
bu
t,
because
t
h
eb
atte
ry
v
o
l
tage
i
s
less
than
20
Vd
c,t
h
e
T
R
O
UBLE
S
H
OOTI
N
G
kn
ee
v
o
l
tage
o
f
VR
5
ca
nn
ot
b
e
r
eac
h
e
d
.
Th
er e f
o
r
e,
VR
5
d
oes
n
ot
co
ndu
ct
and
Q18
r
e
m
a
in
s
bi
ased
off
.
Set
t
h
e
LINE
swi
tc
h
to
OFF
and
r e
m
o
v
e
Α
4
Ρ
1(red
wir
e)
fr
o
m
A
4
J
1
a
nd
Α
4
Ρ
2
(blu
e
wir
e) fr o
m
A
4
J
2
.
Thi
s
di
sco
nn
ects
t
h
e
l
oa
d
fro
m
t
h
e po
w
e
r
supply
.
If
t
h
e
s
upply
vo
l
tages
a
r
e
now
cor
rect,
t
h
e
m
a
l-
If
α
b
atte
ry
h
as b
ee
n
pl
ace
d
in
t
h
e
P
owe
r
M
ete
r
as
fun
ct
i
o
n
i
s
n
ot
in
t
h
e
p
owe
r
supply
.
α
seco
nd
a
ry
p
o
w
e
r
so
ur
ce,
i
t
i
s
a
l
wa
y
s
b
e
in
g
c
h
a
r
ge
d
wh
e
n
e
ve
r t
h
e
lin
e
v
o
l
tage
i
s
coupl
e
d
to
If,
afte
r r e
m
oving
t
h
e
l
oad
,
t
h
e
ou
t
pu
t
vo
l
tages
t
h
e
in
st
rum
e
n
t
a
nd
t
h
e
LINE
swi
tc
h
i
s
ON
.
Wi
t
h
m
eas
ur
e
d
are
l
ess
t
h
an n
o
rm
a
l
bu
t
of
equ
a
l
and
ac
lin
e
(Mains)
p
o
w
e
r
supplyin
g
e
n
e
r
gy
VR
3
i
s
o
pp
os
i
te
po
l
a
ri ty, t
h
e
m
a
lfun
ct
i
o
n
is
probably
in
t
urn
e
d
on,
w
hi
c
h
bi
ases
Q12
f
o
r
α
ch
a
r
g
ing c
ur-
t
h
e
se
ri
es
r
eg
ul
ator
cir
c
ui
ts
.
r
e
n
t
of
appr
o
xim
ate
ly
90
mA
.
Thi
scurr
e
n
t
i
s
supp-
lied
t
hr
ou
gh
CR
6 to
t
h
e
b
atte
ry
ΒΤ
1
.
C
R
7
i
s
V
o
l
tages
s
h
o
wn
in
p
a
r
e
n
t
h
es
i
s
a
r e
f
o
r
b
atte
ry
r e
ve
r
se bi
ase
d
whil
e
t
h
e b
atte
ry
i
s b
e
in
g
c
ha
r
ged
.
o
pe
r
at
i
o
n
only
.
B
attery
C
h
arger
M
o
d
e
l
435
Β

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HP 435B Specifications

General IconGeneral
BrandHP
Model435B
CategoryMeasuring Instruments
LanguageEnglish

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