Teac C-1 User Manual

TAPE TRANSPORT SECTION
4. REEL MOTOR CONTROL P.C.B.
The reel motor control circuit supplies reel motors with
drive current required for PLAY, F. FWD and REWIND.
The circuit also transmits a loading signal to pull the slack
in the tape when a cassette is loaded in the deck, and
drives reel motors to take up the tape. The circuit is divided
for functions for convenience in this Section. Refer to the
whole tape transport circuit for the function of the whole
circuit.
CONTROL PCB
PINCH
| +10V
0652
0653 S R683
4-1 TAPE LOADING
Refer to the paragraph 2.3.
4-2 PLAY MODE
When Q533 turns on (the pinch solenoid operates or
PLAY or REC/PLAY mode is selected), the collector of
Q533 goes low and Q651 and Q652 bias circuit operate.
R651 adjusts Q651 collector current and gives back-tension
torque to the left reel motor. The back-tension torque is
about 8 gr.cm R652 adjusts Q652 collector current and
gives take-up torque to the right reel motor. The take-up
torque is about 44 gr.cm in the PLAY mode.
Q533 SOLENOID
Q652 RIGHT
REEL MOTOR
pore LEFT
T-1309 REEL MOTOR CONTROL PCBS REEL MOTOR
Fig. 23 Play Mode Circuit
4-3 PAUSE MODE
The reel brake is released in the PAUSE mode. This may
cause slack in the tape owing to different timing or the
right and left pinch rollers or to mechanical vibration.
Thus, the circuit is designed so that a weak torque is given
to the right and left reel motors to extend the tape in the
PAUSE mode.
When Q531 turns on, the head solenoid is actuated. Q663
turns off in this time. When Q533 turns on, the pinch
solenoid is actuated. Point (A) goes low at this time. Point
HE
—= = so
CONTROL PCB
Q531
(A) goes high only when Q663 is off (Q531 and the head
solenoid are on) and Q533 (pinch solenoid) is off, that is,
in the PAUSE mode. When point (A) goes high, Q662
turns on and then Q661 also turns on. Then, Q661 collec-
tor current flows in routes (1) and (2) and biases the base
of Q660. The collector current of Q660 flows in routes (3)
and (4) thereby torque is given to the motor. The motor
torque is the same value as in the tape loading.
’
esa @)
RIGHT
REEL MOTOR
l®
LEFT
REEL MOTOR
REEL MOTOR CONTROL PCB | T-1310
Fig. 24 Pause Mode Circuit

Teac C-1 Specifications

General

Brand	Teac
Model	C-1
Category	Cassette Player
Language	English