HP 8110A Service Manual page 235

HP 811 OA Se
r
vice Guide
Des
k
ew Boar
d
F
ig
u
re 7-6 s
h
o
w s t h
e
fun ct
i
o
n
al
uni
ts on t
h
e
D
es
k
e
w b
oard .
Th
ese
h
a
v
e bee
n numb
ered
f
or eas
y
cross-re
f
ere
n
ce
b
et
w
ee
n th e descr
ip
t
i
o
n
a
n d t
h
e d
i
agra
m
.
LEVEL
CONVERSION
Ι Ι
DELAY G
ENER
ATIO
N
Ι Ι
LEVE
L
CONVERSION
Ο -
W
N Ν E L Ι
DI
F
F
DI
FF
DI
FF
εεα
εα Εα
[DELAY
Εα
DELAY Ε
α Εα
ΕΕα
FR
O
M
Ι
At
Ι-
Α
® ~ ΤΟ
P
E
RIOD
r
-
_
101
_
OUTPUT
ι
BOARD
DI
FF
ι
DI
FF
DI
FF
BOARDS
εεα
εα
εα
DELAY
εα
DευΥ
εα
εcι
ιΣα
α~ηιΝα z ι
7- 26 Functional Desc
r
iption
ο ~CL
® α
PO
WER F
I
L
TE
R
S
D
B
1
αff
P
R
O
M
Figure 7-6. T
h
e Des
k
ew
B oard Fu
n
ctio
n
al Units
Th
e
uni
ts, a
n
d
wh at t
h
e
y
do, are as
f
o
ll
o
w
s:
Uni
t Function
1-
P
o
w
er
Fil
ters
N
o
i
se
i
s re
m
o
v
ed
f
ro
m p
o
w
er a
ppli ed to t
h
e
D
es
k
e
w B
oard .
M
ore deta
il
ed descr
ip
t
i
o
n
s o
f t h
e
fun ct
i
o
n
a
l uni
ts
f
o
ll
o
w:
TO MIC
R
O
PR
OC
E
SSO
R
2-
D
e
vi
ce
Bu
s
In
ter
f ace a
n
d co
n
tro
l
-s
i
g
n
al co
n
d
i
t
i
o
nin
g
Th
e
D es
k
e
w B
oard
u
ses t
hi s to co
mmuni
cate
wi t
h
t h
e
Mi
cro
p
rocessor
3-
L
e
v
e
l
Co
nv
ers
i
o
n
a
n
d
D
e
l
a
y p
at
h
Th
e s
i
g
n a
l f
rom t
h
e
P
er
i
od
B
oard
i
s at
EE
C
L
l
e
v
e
l
s a
n
d
i
s co
nv erted to
E
C
L l
e
v
e
l
s
f
or t
h e
de
l
a
y
s .
Th
e o
u
t
pu ts o
f
t
h
e de
l
a
y
s are t
h e
n
reco
nv
erted to
EE
C
L l
e
v
e
l
s
f
or dr
ivin g t
h
e O
u
t
pu
t
B
oards.