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C806, R809
pb
equalizer
0804, Q805
audio
© pb output
Fig. 8-9.
Playback mode audio circuit
8-3-2.
Playback Mode Audio Circuit
Playback
audio
output
is supplied
to the RF
modulator
and
the
monitor/TV
in the TV
mode,
while
it is supplied
to only the RF
modulator
in
the
camera
mode.
The
playback
signal
from
the audio
head
is
amplified by Q801, Q802, Q804 and Q805, and then
supplied
to
the
audio
output.
C806
and
R809
provide negative feedback.
8-3-3.
Audio Dub Mode Circuit
In
the
audio
dub
mode,
the
video
circuits
remain in the playback mode while the audio circuit
is in record.
The erase current normally fed to the
video
heads
is by-passed
to a dummy
load
L803
so that an equal amount
of erase current is fed to
the
audio
erase
head
in both
normal
record
and
audio dub
modes.
8-8
8-4,
POWER
SUPPLY
The internal BP-20 battery or an external power
supply (AC-3420CE)
supplies dc power of 12 V ~
13 V between
Pin 2 (hot) and Pin 4 (ground) of
CN3. Current passes through a 3A
fuse, automatic
shut-off switch S10, and a seires regulator power
supply (Q901
Q903) to provide a Bt of 9 V dc.
The battery meter is connected
between +12V
dc and
+9V
dc.
The meter pointer
stays in the
boundary
region between red and white areas when
+12V
input drops to +11V
dc.
8-5.
CAMERA
REMOTE
CONTROL
CIRCUIT
The Videocorder
has a camera
remote control
circuit
consisting
of Q951
through
Q955
that
is
connected
to the AVC-3420CE
trigger lever micro-
switch
through
camera
connector
CN1.
De +12 V
power is supplied from Videocorder
to the camera
through
CN1
pin 10. When
camera
trigger lever is
switched
on, +12 V is fed back to Z board D951
anode through
CN1
pin 6 to conduct
Q951, Q952,
Q954 and Q955 to energize solenoid.
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