Pace PRC 2000 - Power Source Fault Diagnosis; Power Source: General System Faults

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