Denon DR-M33HX - Erasing Head Adjustment and Replacement; Tape Guide Height Adjustment; Capstan Shaft Thrust Play Check; Take-up Torque Check

5. A djustment and Replacement of Erasing Head
(15)
(1) Height Adjustments
Set the IVI-300 Tool Plate on the mechanism unit. Us¬
ing a surface measure of 3.8 mm from the M-300 Tool
Grip, turn nut (311) and (171) and adjust the height
of Erasing Head's center to coincide with the center of
the l\/l-300 Tool Grip. After adjustment, place the M-
300 Tool Grip on the Erasing Head, check to see that
the M-300 Tool Plate and the M-300 Tool Grip are
parallel, and that the Tilt Angle has not changed. Lock
after adjustment.
(2) Tilt Angle Adjustment
Set the M-300 Tool Plate on the mechanism unit.
Place the M-300 Tool Grip on the Erasing Head, and
check the gap between the M-300 Tool Plate and the
Tool Grip. If the M-300 Tool Grip is tilting toward the
front, loosen the Tilt NUT (311) If it is tilting to¬
ward the rear, tighten it and adjust the Tilt NUT (311)
until the M-300 Tool Grip becomes parallel with the M-
300 Tool Plate.
CAUTION; After adjusting the Tilt Angle, height adjust¬
ment may sometimes be warped. Recheck
height adjustment. If it is warped, readjust
the height. After adjusting, fix nut (311) and
(171).
(3) Erasing Head Replacement
Erase Head may be replaced after removing nut (311)
and (171) which affix it to the deck mechanism.
After replacement, adjust the height and the Tilt angle.
6. H eight Adjustment of the Tape Guide 103
Set the M-300 jig plate onto the mechanism unit and ad¬
just the height by rotating the height adjustment nut 100
so that the 3.8mm section of the M-300 jig can pass
through without contacting the tape guide section of tape
guide 103.
7. T hrust Play Check and Adjustments of the
Capstan Shaft
Thrust Play check and Ad justrnen ts of the Capstan Shaft
45, 111. From the frorit"bf The mechanism, grasp the
capstan shaft and move back and forth in the axis direction.
Check to rhake sure there are thrust play in the right
side capstan shaft 45. Rotate and adjust capstan support
,110 so that the range of the thrust play of the left side
capstan shaft 111 is within 0.2mm—0.4mm. After adjust¬
ing, apply anaerobic adhesive to the capstan support 110.
110 Capstan support
8. Checking the Take-up Torque
Load the cassette type torque meter. Check to make sure
that the torque meter average reading is within 50 ~ 100
g-cm during playback. If it is not within this range, check
the voltage (3.5V ± 0.3V) of the reel motor. If the voltage^-^^
is low, the torque will be weak; if it is high, the torque will
be strong. In addition, check for reel thrust movement
in section 9,
9. Adjusting the Reel Thrust Movement
Check to make sure that the reel thrust movement is
within 0.2—0.4 mm.
10. Checking the FF and REW Torques
* When using the cassette type torque meter.
Check to make sure th? torque meter indicates more
than 70 g-cm at the end of FF and REW.
* When using a modified cassette half.
Load the modified cassette half; hook the end of the dial
tension meter (full scale 100—300 g) onto the triangle
section. In the FF (REW) mode, feed the tape in at a
rate somewhat slower than the take up speed. Check _
to make sure the dial tension meter reads more than 60
g-cm.
11. Checking the Back Tension Torque During
Record/Playback
Load the cassette type torque meter; check to make sure
the torque meter reads between 7 ~ 13 g-cm during play¬
back and that there is no unevenness.
If it is not within this range, check the section on adjust¬
ing the reel trust movement; or replace the spring 109.
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