HTS-420R Maintenance Manual
17
12. Prism/No Prism Switch Motor Replacement
Unscrew the screws and remove the covers of the telescope. Pry the light out with tweezes, as shown in
the picture. Put some alcohol on the screws to melt down the glue and loosen them with the screwdriver
then pull the motor out. Cut the wires of the motor off and put the heat -shrink-tube on either of them,
then connect wires with the ones of the new motor. Solder the junction firmly and heat the
heat-shrink-tube to bind the junction tightly. Put the motor in the adapter and install them all together to
the motor holder. Turn on the instrument and switch the work mode between No-prism and prism. During
the switch, the light shutter will jump up and down correspondingly if the motor is working properly. Turn
on the EDM laser and check if the shutter lens is right in the center of the laser spot when the light shutter
is down. If it is not, put the adjusting pin into the hole of the motor adapter and twist the adapter up or
down to push the lens of the light shutter in the center of the laser spot. Finally, tighten the screw
thoroughly.
13. Light Path Switch Motor Replacement
Replace the light path switch motor in the way of Prism/No Prism-mode-switch motor replacement. Start
measuring to switch the shutter up and down, then check the shutter to make sure it does not block the
laser when it is up, and the edge of shutter head goes into the groove on the base board when it is down.
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