MicroBlaster MB1005
Section 5: Trouble-Shooting and Repair
Comco Inc.
5-5
Issue Date: September 2003
Common Problems, Causes, and Solutions
(cont’d)
Table 5-2: No Abrasive Flow
Problem
Items to Check
Solution
Cutting ceases
but air is
flowing freely
√
Is
any
abrasive
flowing?
Verify the quality of abrasive flow by holding a
piece of glass or shiny metal in front of the
nozzle and depress the footswitch. If there is no
abrasive flow, see below. If flow is erratic, see
“Modulator”.
√
Is the tank empty
or almost
empty?
Switch "Power" to "Off". Fill the tank as
necessary.
√
Is the powder
“channeling”?
Carefully remove the tank cover without
disturbing the powder in the tank. Note if there
are obvious holes or cracks in the powder,
leading down to the orifice. This is caused by
damp powder or moisture in the air supply.
Check the air supply and the powder storage
conditions. Service the air dryer, or install one.
√
Is the tank orifice
plugged?
Remove the powder in the tank following normal
procedures. Remove the orifice and hold it up
to the light. If blocked, clean with high-pressure
air or a small wire.
√
Is the tank orifice
too small for the
powder?
Small orifices should not be used with some
abrasives (see Section 3, Table 3-3).
√
Is the
Modulator
functioning?
Does it hum audibly when the footswitch is
actuated? If not, or if it rattles noisily, the
modulator should be checked. See procedures
below.
NOTE:
Always start the work shift with fresh abrasive powder. Powder left sitting in
an unpressurized machine overnight can absorb moisture. This contaminated
powder can cause flow problems. Keep powder containers sealed and stored
in a cool, dry place.