Onkyo TA-630D

es)
5703 5702
REW COUNTER
Q701,970 945(K)
ene =
; tR702 R704
630K 4.7K coy
7
| ‘2
aa
(| SUMER START (4 702"2,2/S0ILL)
O . .
R717. 10K
C703[ Ta) 2.2716
oO o fe
$701-3 6701-5
3. Memory Rewind
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
Press the reset button to return the counter to 000.
Then press the memory button.
Then commence operation in playback or record
modes, but not rewind.
After reaching any desired position on the tape, press
the rewind key.
Since the deck is now in memory rewind mode, S703
and S704 will be ON. And when the tape exceeds the
original starting position (counter at 999) the counter
switch $702 will also turn ON.
The voltage at point (3) in the circuit diagram will
then increase from 0 to 12V, this signal being applied
to the gate of Q704 via R707 and C703.
Q704 will thus be turned ON.
The charge on C707 will then discharge via the
solenoid and Q704, thereby activating the solenoid.
The depressed keys are thus relased by the activated
solenoid.
Upon completion of the C707 discharge, Q704 will
be turned OFF. C707 will the commence to charge
up again via the SOL701 solenoid to be prepared for
subsequent operations.
MECHANICAL OPERATIONS
1. Drive System
Play Drive
Direct flywheel drive via flat belt passing around the
motor pulley.
Take-up reel driven by an angled belt passing around
the motor pulley and a tension pulley.
Note that because the motor and tension pulleys rotate
in opposite directions, the belt is also passed around an
intermediate pulley.
FF and REW Drive :
The flywheel driven by a flat belt passing around the
motor pulley, presses against an idler which in turn
drives the reel bases.
Q703_DN838__
Q704
2SF656
____(03P05M) 4
pL airy st
5704
PAUSE
$705
Oo oO
& C911,,0.01
PLL DC
(M) SERVO
MOTOR
Pj NATA=483)
O
$701-6
4. Auto Stop
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Motor Pulley
A magnet connected to a counter, which in turn is
connected to the take-up reel via a counter belt, is
rotated during tape transport.
This rotating magnet consequently results in the
generation of square wave output signals from the
Q703 Hall IC (4).
These signals are rectified by D701 and D702,
smoothed by C706, and then applied to the gate of
Q704 (5) which is thus kept at a negative potential.
Once the tape stops, the Q703 output signals will
cease.
C706 will thus be charged up via R714, R713, R710,
and R709, resulting in an increase in voltage. -
Q704 will consequently turn ON if the gate (5)
potential exceeds 0.6V (approx.)
The charge on C707 will then discharge via Q704 and
the solenoid. The solenoid is thus activated, releasing
the depressed keys, and bringing tape transport to a
halt.
After C707 has completely discharged, Q704 will
turn OFF. C707 will then recommence to charge up
again via the R714 solenoid in order to be ready for
the next auto-stop operation. This charge up time is
approximately 3 seconds.
Tension Pulley
Middle Pulley
h
Reel, supply
Reel, take-up
Idler lever
Flat belt