Operating instructions

NOTE: This adjustment is not critical to the performance to the machine. A
150-200 gram difference in tension between the Supply and Take-up sides is
acceptable for balanced braking in case of a power failure.
5. If the tension is not within acceptable limits, loosen the tension bracket
locking screw and adjust the tension adjustment nut on each brake
assembly. The adjustment nuts are accessible by either removing the
side panels or by lowering the VU meter panels.
6. Check the feed tension by repeating the above procedure by winding the
string on the reel in the opposite direction from that used to measure the
holdback tension and pulling steadily on the spring scale. The feed
tension should be one-half or less of the holdback tension.
6.1.8 Reel Turntable Height
This adjustment is not necessary unless the Reel Table has been removed or
the tape is obviously rubbing on a Reel Flange. The rubber surface of the
Reel Table should be 1.5mm (0.06") above the Reel Table Guard Ring. If the
height is not correct or if the tape rubs on a Reel Flange, adjust as follows.
1. Loosen the set screw in the hub of the Reel Table as shown in Figure
6-8.
2. Turn the Reel Table counterclockwise to raise it or clockwise to lower it.
Each revolution of the Reel Table changes the height approximately 0.5
mm (0.02").
NOTE: Reel Table height measurement should be performed at the side of
the Reel Table nearest the rear of the machine.
3. When the height is correct, lift the reel table from the motor shaft and
check that the reel table set screw is aligned with the flat sides of the
motor shaft. When aligned, lower the reel table and tighten the screw.
4. Run an adjustment tape through the machine to confirm that the height
is correct.
CAUTION: Be sure to align the set screw with the flat side of the motor shaft.
There is only one flat side of the shaft, so turn the Reel Table until the set
screw is aligned with the flat side of the shaft.
REEL TURNTABLE
1.5 MM ~ 2.0 MM
REAR OF THE MACHINE
GUARD
RING
SET SCREW
Figure 6-8
Reel Turntable Height Adjustment
MTR-90III Operation and Maintenance Manual
October 1990
Section 6 Alignment
6 - 11