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Bearings in the drive mechanism are pre-lubricated
and sealed; no further attention is needed for these.
11.3
Fuse inspection
The scroll saw is equipped with a 5-amp fuse for
overload protection. If the saw stops working,
inspect fuse:
1. Unscrew fuse cap (Figure 11-2) and pull fuse
out of cap.
2. If fuse has blown, replace it.
3. Install new fuse into cap, then screw cap into
hole.
Figure 11-2: fuse inspection
11.4
Commutator brush inspection
To maintain motor efficiency, inspect the two carbon
brushes every two months, or more frequently if saw
is heavily used. Stalling or loss of power may be a
symptom of worn carbon brushes. If one brush is
worn out, replace both at the same time.
Continued use of a damaged or
worn brush may result in damage to motor
armature.
1. Unplug saw from power source.
2. Unscrew and remove cap with flat blade
screwdriver. See Figure 11-3.
3. Gently pry up an edge of the brass clip, until the
spring causes it to disengage from hole. (Notice
orientation of brush as you remove it; it should
be inserted in the same manner; curvature of
brush will match curvature of motor.)
4. Pull out brush and inspect. Brush should be
replaced if any of the following are discovered:
Brush has worn to about 1/2-inch long.
Signs of crumbling, burning or breaking.
End of brush is rough or pitted.
Abnormal coloration of spring
Broken lead in spring
Collapsed spring
5. Install new brush (or reinstall current brush) and
gently press it all the way into hole until the
brass clip is secured.
6. Install cap.
7. Repeat for opposite brush.
NOTE: It is recommended that saw be run without
load for several minutes to seat new brushes.
Figure 11-3: brush inspection