Section 5: Trouble-Shooting and Repair
MicroBlaster MB1005
Comco Inc.
5-12
Issue Date: September 2003
Inspecting and Repairing the Modulator
(cont’d)
10.
Using a 5/8" open-end wrench, remove the modulator housing from the
tank.
Note:
If it is difficult to reach the housing, it may be necessary to remove the
tank to allow better access to the modulator housing. Turn the
MicroBlaster on its side and remove the three screws from the bottom of
the unit that hold the tank legs in place. The tank will lift out, providing
access to the modulator coupling.
11.
Use a vacuum to remove any residual powder from inside the tank mixing
chamber (at the modulator connection).
12.
Make sure threads are clean and abrasive free. Install the new modulator
housing (P/N MB1301-2) to the tank. Tighten with a 5/8" open-end
wrench.
Note:
If the tank was removed per Step 10, replace it now.
13.
Slide the 1" washer over the modulator housing and then slide the
modulator coil over the modulator housing. Make sure that the end of the
coil with the wires attached is closest to the tank.
14.
Screw on the 7/8" coil retaining nut and tighten.
15.
Remove the hose connector nut from the modulator and slide it onto the
air hose. Slip the end of the air hose onto the modulator hose connector.
Tighten the nut with a 7/16" open-end wrench.
16.
Replace the MicroBlaster cover.
17.
Install the tank cover.
Moisture
If the cutting action of your MicroBlaster appears to be degraded but air is flowing freely
from the nozzle, the problem is usually caused by moisture in the abrasive powder.
How to Check for Moisture in the Powder
With the Power OFF and the unit depressurized, carefully remove the tank cover so as
not to disturb the contents. Is the powder “channeling”? In other words, are there
obvious holes or cracks through an apparently solid mass or clumps of powder? If so,
you have a moisture problem. See Section 4, “Moisture”, on how to prevent moisture
from contaminating your powder.
