Sharp VT-3418X, Service Manual, Page: 47 / 170

n
MECHANISM OPERATION FLOWCHART
CASSETTE INSERTION STOP
0
l
This flowchart describes the outline of the mechanism’s operation, but does not give its details.
l
Function of cam switch bit reading.
The on/off of cam switch is cam position switch input signals in conditions as shown in below.
End
I
J
I
1
Insert cassette.
I I Cassette is ejected and loading I
SW SW SW
‘ON’ ‘ON’ ‘ON’ ‘ON’ ‘ON‘ ‘ON’ ‘OFF’
Mechanism position SW input L H H H H L H
I
t
,
motor stops.
I
Turn off cassette switch.
I
t
Cassette switch turns on.
I
1
I
Mechanism input H L H H L I
Mechanism position input H L I L I H
I I
I
Loading motor starts in normal
direction and master cam clockwise.
Loading motor turns in reverse
direction and master cam
t
counterclockwise.
Does cassette control clutch come
off within sec. after cassette
t
switch has turned off?
(Cassette is judged caught halfway.)
Mechanism position SW input
H H H L L
H
Cassette
inserting
Are start/end sensors at low level
before cassette insertion?
NO
(Cassette LED or some
judged defective.)
input
input
input
Input
Mechanism position SW
Mechanism position SW
Mechanism position SW
Mechanism position SW
SW
part is
I
Drum motor starts.
I
t
Pinch roller comes into contact.
Mechanism
position SW
h
Cam switch is at position.
position SW
Mechanism
position
.
:
:
: :
. .
. ,
: : :
: : :
: :
:
. : :
. .
: :
. .
. .
. .
: :
:
:
:
:
:
. .
: : :
: :
. ,
: .
: :
: :
: :
:
. Shift zone
: :
.
: .
:
: :
: :
. .
Is drum pulse outputted?
Unloading
I
End
CAM SW
SW
CD SW SW
SW