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5-6-2. Replacement
of the T Tension
Detetctor
Tool:
L-shaped
hexagonal
wrench
(across flat has
1.5 mm)
Replacement
procedure:
(1)
Disconnect
CN234
on
the
MB-139
Board
from
the back of the unit.
(2)
Remove
the
fixing
screw
from
the
T
Tension
Detector.
(3)
Remove
the TRC
Detector
Block.
(4)
Loosen
the
set
screw
of
the
Cassette
Guide
Block
and
remove
the
Cassette
Holder.
(5)
Remove
the T Tension
Regulator
Arm
and
the
T
Tension
Detector
Block
from
the
shaft.
(Note
that
there
is a spring
and
a
collar as shown
in the figure.)
(6)
Replace
the
detector
block
with
a new
one.
(7)
Join
the
T
Tension
Detector
Block
with
the
T Tension
Regulator
Arm
and
put
the
defective
parts
of
the
assembly
on
the
shaft.
Be
sure
that
the
shaft
of
the
tension
detector
is between
the
two
Leaf
Springs
as
shown
in
the
figure.
(8)
Put
the
collar,
spring
and
the
Cassette
Holder
on the shaft.
(9)
Tighten
the fixing screw
and
install the T
Tension
Detector
to the unit.
(10)
Connect
CN234
on
the
MB-139
Board
from the back of the unit.
(11)
Position
the
notch
of
the
TRC
Detector
Block
in
the
groove
of
the
Cassette
Holder.
While
pushing
the
TRC
Detector
Block
in
the
direction
of
the
arrow,
install
it on
the
unit.
(12)
Adjust as described in Section 5-12.
PTC-29 Board
fixing screw
T Reel Table
T Tension Detector Block
Cassette eee
set screw
_—*
spring
T Tension Detector Arm
shaft
T Tension Detector Block
wD
leaf springs
w
ef
Cassette Holder
TRC Detector Block
a e
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