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11.
Back Tension Set-up in the Fast Forward Mode
(Refer to Fig. 13)
When
adjusting
(RV702)
and
setting
up
the
forward back tension, the fast forward back tension
is automatically decided.
(fixed)
1.
The
fast
forward
(>)
output
from
IC701
passes through D740
and R791 and is added to
the base of Q735.
(path @)
®@ Q735 base voltage becomes
IC Output
(>>)
about 12V,
(
): For 7-inch reel.
i
R601 (R602)
R791 + R601 (R602)
(V).
In addition, this output is passed through R601
(R602)
connected
to
REEL
SIZE
selecting
switch
(S601-1)
and
then
grounded
through
D734 and Q720.
(Path @))
The
values
for
R791,
R601
and
R602
are
determined
to obtain the desired fast forward
back tension in the situation where the forward
back tension is adjusted.
oO
3
oO
4
>>
IC output
TC-766-2
M60
supply reel motor
$60l-1
(REEL_SIZE]
' io%
R601
O
oO
t
Fig. 13
[switch circuit board]
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