HP 182C Operating And Service Manual page 26

Model 182C
Theory
4-74.
Diodes
A5CR9/A5CR10
and
A5CK4/A5CR5
limit
the
output
to the
deflection plates to prevent overdriving.
Diodes
A5CR8
and
A5CR3
ptevetU
A5Q5
and
A5Q7,
respectively,
from
saturating.
4-75.
Depressing the
FIND
BEAM
control disables
diode
limiter
A5CR4/A5CR5
and blocks the
signal
to
A5Q8.
The
differential
gain
is
effectively
cut
in half,
and the
horizontal deflection of the
beam
is
confined to the
limits
of the
CRT.
4-76.
POWER
SUPPLY DECOUPLING.
4-77. Decoupling networks
are used
on each etched
cir-
cuit
assembly
for
the
supply
voltages.
The
use
of
decoupling
i$
important
to
prevent extraneous
signals
or
noise
from
being introduced
into circuitry
from
the
power
supplies or supply
leads.
Decoupling
also
prevents
transients originating
in
other
circuits
from
being
intro-
duced.
4-7