Mechanism Adjustments - Sanyo RD5035 Service Manual

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.
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