Sharp vc-ga56z Service Manual page 31

Video cassette recorder
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G mechanical timing
Mode check
25
Cam mark
20
Mode detection outside
(D709 SW B)
15
Mode detection inside
(D708 SW A)
10
5
0
60
CA/END
CS/EJ
UL
0
19.812
81
10.354 12.812
EJ
UL
Mode detection outside
0
0
0
0
0
1
1
1
Mode detection inside
1
1
0
0
0
0
1
1
S sensor
1
1
0
1
1 or 0
Open
S sensor
Close
Mode detection inside
sensor A
CS/EJ
1
ULD
1
PU1
1
PU2
0
VSR
0
PB
0
SLOW
0
FF
0
STOP
0
Cam graph E
120
180
240
300
PU1
PU2
VSR
PB
SLOW
179
200
233
265
282
PU
PU2
VSR
PB
SLW
1
1
1
1
0
1
1
0
1
0
0
1
1
0
1
1
0
0
0
0
0
0
0
0
0
0
0
Mode detection outside
sensor B
0
1
1
1
1
0
1
1
0
Double action rack slides.
Loading motor starts in normal
direction and master cam counter
clockwise.
Cassette
inserting
Does mechanism position sw.
380
come off within 2.5 sec.?
FF
STOP
316
334
Are start/end sensors at low level
before cassette insertion ?
FF
STP
0
1
1
0
0
0
0
0
Pinch roller comes into contact.
Full-
Cam switch is at PB position.
loading
Loading motor stop.
Is drum FG pulse outputted ?
CASSETTE INSERTION
STOP
Insert cassette.
Cassette is ejected and loading
motor stops.
Start sensor close.
Loading motor turns in reverse
direction and master cam
counterclockwise.
NO
(Cassette is judged
caught halfway.)
YES
NO
(Cassette LED or some other part
is judged defective.)
YES
Drum motor starts.
Tape loading.
NO
YES
End
End
Unloading

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