Denon DRM-600 - Page 20

ADJUSTING AND CHECKING THE
| MECHANISM SECTION |
1. Replacing the Pinch Roller (36)
Before replacing the pinch roller, clean the tape contact surface
of the pinch roller and the capstan shaft.
Most causes of poor tape transport can be traced to dirty pinch
roller and capstan shaft.
(1) Removing the Door Frame (42)
Remove the door spring (41) from the protrusion on the
door frame (42). Remove the two securing screws in the
bracket (L) (37). Detach the bumper (39) from the door
frame protrusion, and then remove the door frame.
(2) Removing the pinch roller (36)
Remove the clips that press the pinch roller and pull the
pinch roller forward to remove it.
After replacing, run a padless C-90 tape to check for tape curls
at the tape guide section of the head.
2. Checking the Pressure Force of the Pinch
Roller
In the playback mode, hook a spring weight onto the bracket at
the center of the pinch roller. After separating the pinch roller
from the capstan shaft, allow the pinch roller to contact the caps-
tan shaft again. Check to make sure the spring weight reads be-
tween 250 ~ 350 g when the pinch roller starts to rotate.
Replace the pinch roller (36) when it does not conform to the
standard specification values.
3. Replacing the Record/Playback Head (16)
(1) How to remove the R/P HEAD.
1) Remove securing screw (53) and azimuth adjusting
screw (53) from the récord/playback head.
2) Remove the soldered head wire and disassemble the
mechanical unit to remove the record/playback head.
(2) How to assemble the R/P HEAD.
Reverse the above 1 procedures for removing the R/P
HEAD.
* Solder the HEAD WIRE according to the diagram.
4. Adjusting the R/P HEAD (16)
Azimuth adjustments
Playback the A-BEX TCC-153 test tape. Turn the azimuth ad-
justment screw and adjust so that A of the resurge waveform is
maximum and B is minimum.
* After the adjustments, apply anaerobic adhesive on the posi-
tions indicated in the diagram.
Note: Only the azimuth adjustment is necessary; no height ad-
justments are required.
ee,
A-BEX TCC-153
Capstan shaft
BROWN
ORANGE
BLUE