Reel Motor Drive Circuit - Tascam 122 Service Manual

122
U601 Pin 12
HIGH
l OW
OSOI
OFF
ON
0514
OFF
ON
HIGH
[BASE
lOW
OSIS
COLLECTOR
HIGH
lOW
0518
OFF
ON
HEAD 8ASE
SOLENOID
OFF
OS02
ON
OFF
0508
O N
OFF
0509
ON
HIGit
[BASE
lOW
0511
HIGH
COLLECTOR
lOW
OFF
0510
O'
PINCH ROLLER
SOLENOID
II
I \
l J
I (
h
;(
\
I \
'"
\
[ \
(
+39V
+24V
+9V
OV
\
\
/
/
I~
(~
1
(
(
' -
i l
(X
I)
+24V
+9V
ov
Approl . Apprat.
400mSIC
IOOmSec;
STO P DELAY
PLAY
Fig. 3-8 Timing diagram of solenoid operation (in repro­
duce model
\
3-4. REEL MOTOR DRIVE CIRCUIT
3-4-1 Direction of motor rotation
The reel motor drives the left or right reel disk
to take up the tape. Torque is transmitted from
the reel motor to one of the reel disks during
the reproduce, fast-forward, and rewind modes
by the processes shown in Fig. 3-9 - 3-11 (as
seen from the front of the deck). As seen from
Fig. 3-9 and 3-11, the reel motor rotates in the
same direction during the reproduce and rewind
modes and the fast-forward pulley mechanically
selects either the left or right reel disk and drives
it in accordance with the direction of reel motor
rotation. In the pause mode, the reel motor does
not rotate.
MOTOR PULLEY
- - - i ' - - - - i " 4
RIGHT-HAND
REEL DISK
Fig. 3-9 Reel disk drive (reproduce mode)
INTERMEDIATE
PULLEY
RIGHT-HAND
REEL DISK
REEL MOTOR
Fig. 3-10 Reel disk drive (fast-forward model
REEL MOTOR
INTERMEDIATE
PULLEY
Fig. 3-11 Reel disk drive (rewind model
15