Advertisement
At the end of the selection, if the unrecorded
section of the tape (functioning
to change the
output from pin 13 from low to high) holds the
level continuously high for over 8 seconds, PD6006
then selects the FF mode, continuing in that mode
until the beginning of the next selection drops
the level at pin 13 low. It then rewinds ( << )
back out to the beginning of the selection, and
enters the PLAY mode.
After this 7 seconds has elapsed, it once again
retums to the FF or REW mode and cycles
through another search operation until all selec-
tions on the tape are thus indexed.
If the tape should end while the unit is in FWD
FF, or REV REW, either the STOP status would be
entered, or a direction
operation would allow
search to continue, depending on the reverse mode
switch setting.
When in INDEX SCAN operation, REW KEy
(FF KEY in REV direction) is placed ON,INDEX
SCAN is operated in REW mode as shown in Fig.
r-2t.
3. BLANK SEARCH Operation
When the BLANK SEARCH key is placed ON,
if the unit is operating in the FWD direction, the
search is started in the FF ( >> ) mode; if operat-
ing in REV, it is started in the REW ( << ) mode.
When input to the blank detector (output by pin
13 of PA3010) is held high for 8 seconds, or when
the tape end sensor is detected, the present direc-
tion of travel is reversed, and the tape returns to
the position where input to the blank detector
snapped from high to low.
From this position, the unit reenters the PLAY
mode until a point is reached where the input at
the blank detector is maintained at a continuously
high level for 4 seconds. It then goes into a STOp
status, completing the operation.
As shown in Fig. L-22 (3), in case of the un-
recorded tape, the tape retums to the tape end in
REW mode after the search had been done for 8
seconds in FF mode-
When detecting the tape end, the tape travels
the leader tape portion
for 0.8 seconds in FF
mode and then goes into a STOP.
i.-
e sec -l
I A P E E N O
l
i
I
D .
Fig. 1-20
MS/SKIP operation
2. INDEX SCAN Operation
When INDEX SCAN is activated, if the unit is
operating in the FWD direction, the FF ( >> )
mode is entered; if in REV, REW ( << ) is entered.
The unit then cycles through a search operation
to locate the beginning of a selection, then goes
into the PLAY mode. Playback of the selection
starts and continues for the 7 seconds that pin 18
of PA3010 is held low.
REW
REW KEY ON
D
I
R
E
c
T
I
N
L E A D E F i
PLAY
r 8
s e c =
F i g . 1 - 2 1 I N D E X S C A N o p e r a t i o n
Fig. 1-22
BLANK SEARCH operation
Advertisement
