Pace PRC 2000 Service Manual page 29

REPAIR
MICROCHINE HANDPIECE CONT'D
S Y M P T O M
Motor will not run.
Status LED
illuminated Red
in color.
Motor will not run.
Status LED not
illuminated Red
in color.
Motor runs
continuously.
No Ground
on tip of installed
Tool.
Table II. MicroChine Handpiece Checkout Procedures
24
CHECKOUT PROCEDURE
Unplug all SensaTemp
handpieces. If motor now runs
and Status LED turns off -
Check resistance - Pin 1 to Pin 4
with Finger Switch depressed.
If resistance is greater than 1
ohm -
Check resistance - Pin 3 to Pin
6. Resistance should be 3 to 40
ohms. If not -
Check resistance - Pin 1 to Pin
4. Resistance should read
open circuit. If not -
Check resistance - Pin 4 to a
NEW Tip. Resistance should
be less than 2 ohms.
If not -
C A U S E S O L U T I O
Repair
Shorted shorted
SensaTemp SensaTem
handpiece. handpiece.
Replace
Open Switch MicroChine
circuit. Handpiece.
Replace
Defective MicroChine
Motor circuit. Handpiece.
Replace
Shorted Finger MicroChine
Switch. Handpiece.
Clean
Oxidation in MicroChine
drill collet. Collet.
Open ground Replace
circuit. MicroChine
Handpiece.