Handpieces - Pace ST 40A Operation & Maintenance Manual

Handpieces

The following "Heater Assembly Checkout Procedures" (Table V) is applicable to
all PACE SensaTemp handpieces used with the ST 20 system except for the
ThermoTweez (TT-65) handpiece. Refer to either of the TT-65 manuals (5050-
0300 or 5050-0336) for troubleshooting procedures pertinent to that handpiece.
Perform the procedures with the handpiece (and heater) at room temperature. If the
handpiece is warm, resistance readings will be different from those shown.
Disconnect the handpiece from the power source. Use a meter to check resistance
across the handpiece connector plug pins as outlined in the "Checkout Procedure"
column.
Symptom Checkout Procedure
No heat on Check resistance - Pin 2 to
handpiece. Pin 5. Refer to "Heater
Specifications" column.
If resistance is high - -
Check resistance - Pin 3 to
Pin 6. If circuit reads open - -
Handpiece Check resistance - Pin 3 to
overheating Pin 6. Resistance should be
LED is Red. 110 ohms. If resistance is
less than 105 ohms - -
Fuse blows Check resistance - Pin 2 to
when unit is Pin 5. Refer to "Heater
turned on. Specifications" column. If
resistance is low - -
No Ground Check resistance - Pin 4 to a
on Tip. NEW Tip. Resistance should
be less than 2 ohms. If not - -
Heater
Specifications
SP-1A = 10-12 ohms
SP-2A = 8-10 ohms
SX-70 = 8-10 ohms
TP-65 = 9-11 ohms
TJ-70 = 6-8 ohms
Table V. Heater Assembly Checkout Procedures
Cause
Open Heater.
Open Sensor.
Shorted
Sensor.
Solder short in
Handpiece.
Shorted
Heater.
Oxidation in
Heater Bore.
Defective
Heater.
Connector Plug
Pinouts
Corrective Maintenance
Solution
Replace Heater Assembly.
Replace Heater Assembly.
Replace Heater Assembly.
Remove Short. Replace
Heater Assembly & Fuse.
Replace Heater Assembly
& Fuse.
Clean Heater Bore using
appropriate wire brush.
Replace Heater Assembly.
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