Dokorder 7700 - Page 26

operating
voltage
of the
solenoid from Vr
to Vr
also lowers
the
drawing force
of
the solenoid
from
FH
to
Fr.
Yet,
F1 is
still
larger
than
force Fo
so
that
the
operation
of
the
linked mechanism
is
retained.
When
this circuit is
switched
to the STOP
mode,
the Time
Delay
switch is automaticaliy
turned
to the V;1
posi-
tion,
preparing
for
the next PLAY
operation. The
operation
princlple
of this circuit
also applies
to the FF
or
REW
mode in
the same manner,
so no explanations
wijl
be made.
.1
'(B)
Operation
Modes
The
actual
circuit of Model
7700
is shown in Fig.8-3,
with
the
components
but wirings not related
to the
sole-
noid
drive circuits
are
omitted.
Based
on
Fig.
8 3,
the
operation of
the circuit in individual
modes will
be
illustrated with figures
and brief
descriptions.
1. STOP mode
4.
Switching
from
STOP to REC mode
Fig.8-3
on this
page.
Fig.8
6 on
page
25.
2.
Switching from STOPto PLAY
mode
5.
Turning
PAUSE
switch
ON/OFF
in REC
mode
Fig.8-4
on
page
24.
Fig.8
7 on
page
2b.
3. Switching from STOP
to
FF
or REW mode
6.
Turning
AUTO
SHUT
OFF
switch
ON in
REC
mode
Fig.8-5
on
page
24.
Fig.8
8 on
page
26.
"STOP"
mode
o
Trigger Circuit
C 501,
C 502, C 503
and C 504 are all
discharged
through R
501.
o
Voltage
Control Circuit
Voltage
(14.6V)
is applied
toZenner
Diode to turn
O 501 on;O 502 and O 503 are then turned off.
-;.";;
NOTE:
REC
SW 1
-
3
FFSWl-3
REWSWl-3
PLAYSWl-3
PAUSESWl
-2
Switches are
separately
ganged
up
to operate the
deck
in
desired mode.
F
ig.8-3
23