Sanyo RD5035 - Sanyo RD5035 Mechanism Calibration; Take-up Torque Adjustment; Back Tension Measurement; Tape Tension Adjustment

MECHANISM ADJUSTMENTS
1. TAKE-UP TORQUE 4. TAPE SPEED
Set
the
unit
to
PLAY,
F.FWD
or
REW
mode.
Remove
the
cabinet
Measure
each
torque
with
a
torque
gauge.
Connect
a
tape
speed
counter
to
LINE
OUT
terminal
Each
torque
should
be
as
follows;
(left
or
right
channel)
of
the
unit.
PLAY
35
—
60
g/cm
Load
a
test
tape
(MTT-111)
and
operate
the
unit
in
FAST
FORWARD
55
—
95g/cm
PLAY
mode.
REWIND
60
—
100
g/cm
Turn
semifixed
variable
resistor
of
the
motor
clockwise
If
each
torque
fails
to
reach
the
standard
value,
clean
the
or
counterclockwise
to
obtain
3
kHz
indication
of
the
drive
belt,
flywheel,
motor
pulley,
take-up
reel
idler
and
tape
speed
counter.
rewind
roller
with
a
cotton
swab
soaked
in
alcohol.
Figure 1.
2. BACK TENSION
To measure back tension with tension gauge, make a
hole in the side of the cassette as shown in figure two. Figure 4.
Be sure the tape does not rub against the edge of the
cassette, or correct measurement will be impossible.
PLAY Less than 5 g/cm
FAST FORWARD Less than 5 g/cm
REWIND Less than 5 g/cm
Figure 2.
3. TAPE TENSION
Cut off a length of tape. Tie one end to a thread con-
nected to the tension gauge, and leave the other end
hanging loose as shown in figure three.
Operate the unit in PLAY mode and hold the tension
gauge steady,
When the tape stops, read the tension gauge. If this
reading is over 120 gram, no adjustment is needed.
If it is under 120 gram, adjust the pinch-roller pressure.
This is done by bending the spring wire 38 (141-2-852T-
47400) shown in the mechanism exploded view. Clean
the pinch roller with alcohol so the tape will not slip.
Figure 3.
Li tian 7