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.
TAPE END
SENSOR
CAPSTAN SERVO
CAPSTAN
DRIVER
DRUM
DRIVER
DRUM SERVO
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
BATTERY
SENSOR
LOADING
DRIVER
DEW
SENSOR
CASSETTE
SW
REC
SW
MODE
SW
TAPE LOADING
MECHANISM
Fig. 6-5. Mechanism Control Circuit
IC351
CXP80724
VOLTAGE REGULATOR
r - - - - - - - - - - - - - - - - - - - - - - - ,
UNREG
+
I
I
I
I
I
I
I
I
IC391
LB1 638
Fig. 6-6. Loading Control Circuit
- 4-36 -
S/S S V
LOADING MOTOR
