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6-7. MECHANISM CONTROL
Mechanism control includes cassette tape loading and
unloading control, tape travel speed control by means of the
capstan motor, ON/OFF control, direction control and drum
motor ON/OFF control.
Precise rotation control for the capstan motor and drum
motor is carried out by the independent servo control
program in the main controller.
Details of this are described in the following chapter.
During operation of the mechanism, the various sensors are
checked , and if an abnormality is detected , a standby
operation is carried out.
IC351
CXP80724
TAPE END
SENSOR
CA P STAN SERVO
CAPSTAN
DRIVER
DRUM
DRIVER
DRUM SERVO
Fig. 6-5. Mechanism Control Circuit
r - - - - - - - - - - - - - - - - - - - - - - - ,
I
VOLTAGE REGULATOR
+
I
UNREG
I
I
I
I
I
I
Fig. 6-6. Loading Control Circuit
- 4-36 -
The standby operations are explained later.
For details on mechanism operation, refer to the chapter on
mechanism.
6-7-1 . Tape Loading Control
The drive circuit of the loading motor is shown below.
ON/OFF operations and the direction of rotation are
controlled by the LOAD and UN LOAD signals.
Power is supplied from the constant voltage supply (5 V)
from the voltage regulator circuits (IC392 and 03901 ).
{
T/E
LED
BATT.
Tape Top
{
S Reel
T Reel
DEW
{
CASS LOCK
�
REC
CFG
CAP
WM
CAP F/R
MODE
{°'"
DFG
DRUM PWM LOAD
MAIN CONTROLLER
IC391
LB1 638
BATTERY
SENSOR
DEW
SENSOR
CASSETTE
SW
REC
SW
MODE
SW
LOADING
DRIVER
TAPE LOADING
MECHANISM
S/S S V
LOADING MOTOR
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