Sanyo RD2016 - Mechanism Adjustments

MECHANISM ADJUSTMENTS
1.
TAKE-UP TORQUE
Set the unit to PLAY, F.FWD or REW mode.
Measure each torque with a torque gauge.
Each torque should be as follows;
PLAY 35 — 60 g/cm.
FAST FORWARD 70 — 130 g/cm
REWIND 70 — 130 g/cm
If each torque faiis to reach the standard value, clean the
drive belt, flywheel, motor pulley, take-up reel idler and
rewind roller with a cotton swab soaked in alcohol.
TORQUE GAUGE
TORQUE GAUGE
. BACK TENSION
To measure back tension with tension gauge, make a
hole in the side of the cassette as shown in figure two.
Be sure the tape does not rub against the edge of the
cassette, or correct measurement will be impossible.
PLAY Less than 5 g/em
FAST FORWARD Less than 5 g/cm
Less than 5 g/cm
REWIND
TENSION GAUGE
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 32 (141-2-852T-
47400) shown in the mechanism exploded view. Clean
the pinch roller with alcohol so the tape will not slip.
. Tape speed
. Remove the cabinet (see page 1).
. Connect a counter to playback output terminals. Load
with test tape (MTT-111, etc:). Press down PLAY lever.
. Using a screwdriver (with about 2mm wide blade),
turn semivariable resistor for adjusting motor speed until
the counter reads 3 KHz + 10 Hz.
SVR
(Tape speed adjustment)
MOTOR