Samsung VP-L900, Training Manual

Page: 88 / 173

Circuit Operating Description
Samsung Electronics 6-9
6-1-2 Sensor control
(1) Tape Top/End Detect
It passes the portion where the light which occurs from the LED which is to be located in the center
department of the cassette tape TOP/END is transparent.
By the TOP/END SENSOR which is to right and left side of the mechanism it is detected and it recognizes
from the micom.
The TOP of the MICOM (IC601) or the END densor input is when the cassette becomes the LOADING, “H”.
From rising edge of the Tape LED, the MICOM input (pin#20 and 19) this falling edge inspects,
simultaneously the top the end sensor is operated.
Tape top/end detect time
CAPSTAN
T
OFF
T
ON
SPEED
Loading 2.73ms 19.11ms
1 2.73ms 131.4ms
3 2.73ms 43.8ms
7 2.73ms 32.7ms
9 2.73ms 19.6ms
15 2.73ms 10.28ms
19 2.73ms 8.19ms
T/E LED
TAPE TOP
TAPE END
MECHANISM
!
T/E LED
@
Inverter
#
Sensor out
$
Micom input
! @
#
$
9
0
T
ON
T
OFF
IC601
MICOM
Q601
Fig. 6-8