Teac C-1 Service Manual page 43

TAPE TRANSPORT SECTION
2-4 PLAY AND PAUSE
(1) Play
In the PLAY mode, a high level signal is output from pin 17
of the SYS-CON. The brake solenoid operates with the
current in route (1), and releases the brake. Then Q523
turns on and the base current (in the route (2) of Q511
stops and thus Q511 turns off. While Q511 is being turned
on, the tape end detection circuit is inhibited, but it is set
in the standby condition when Q511 turns off. (Refer to
the paragraph 2.7 for the tape end detection circuit). The
current in the route (3) turns on Q522 and Q531, and
actuates the head solenoid. When Q522 turns on, Q526
tuns off after about 150 milliseconds and operates the
pinch solenoid drive circuit.
With Q526 turned off, Q527 and Q533 turn on. With
Q533 turned on, the pinch solenoid operates and at the
same time a low level signal is sent to the reel motor control
PCB. This signal operates the reel motor control circuit so
that the current necessary for play operation is supplied
to the reel motors. (Refer to the Section 4)
With Q526 turned off, Q528 turns on and sends a low level
signal to the OSC PCB of the amplifier section. This signal
resets the muting of the playback amplifier.
R5952-R597
LOW MUTE OF F,
RSS6N R6O!I 1Q528
(2) Pause
In the PAUSE mode, a high level signal is output from pin
18 of the SYS-CON. This signal operates as follows and
sets the deck in the PAUSE mode.
Route (4): Turns on Q511 and inhibits the tape end detec-
tion circuit.
Route (5): Operates (or holds) the brake solenoid.
Route (6): Operates the head solenoid.
Route (7): Turns on Q526 and inhibits the pinch solenoid
circuit. Stops the reel motor control signal at
the same time. Further, turns off Q528 and
sends a high level muting signal to the playback
amplifier.
Route (8): Tums on Q502 and lights the PAUSE indicator.
In the PAUSE mode, the current in route (9) operates the
reel motor control circuit which supplies weak current to
the right and left reel motors to pull in the slack in the
BRAKE_SOL,
R600
Q526 PLAY MUTE] R599
({ i) (in MUTE ON
Vhs
tape. (Refer to the Section 4, (3))
TAPE END DETECTING CIRCUIT
DRIVER
TO REEL MOTOR
CONTROL PCBR3
TO REEL MOTOR
CONTROL PCB*IO
eno tee ia, 4 7
| R598 ey
Ss (~)a533 | peor jane
R604: NaS '
+24V
Le a ee a +10V
D632
T-1298
Fig. 12 Play and Pause Circuit
11