37
Corrective Maintenance
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
Cause
Solution
No heat on
handpiece.
Check resistance - Pin 2 to
Pin 5. Refer to "Heater
Specifications" column.
If resistance is high - -
Open Heater.
Replace Heater Assembly.
Check resistance - Pin 3 to
Pin 6. If circuit reads open - -
Open Sensor.
Replace Heater Assembly.
Handpiece
overheating
LED is Red.
Check resistance - Pin 3 to
Pin 6. Resistance should be
110 ohms. If resistance is
less than 105 ohms - -
Shorted
Sensor.
Replace Heater Assembly.
Fuse blows
when unit is
turned on.
Check resistance - Pin 2 to
Pin 5. Refer to "Heater
Specifications" column. If
resistance is low - -
Solder short in
Handpiece.
Remove Short. Replace
Heater Assembly & Fuse.
Shorted
Heater.
Replace Heater Assembly
& Fuse.
No Ground
on Tip.
Check resistance - Pin 4 to a
NEW Tip. Resistance should
be less than 2 ohms. If not - -
Oxidation in
Heater Bore.
Clean Heater Bore using
appropriate wire brush.
Defective
Heater.
Replace Heater Assembly.
Heater
Specifications
Connector Plug
Pinouts
SP-1A
SP-2A
SX-70
TP-65
TJ-70
= 10-12 ohms
= 8-10 ohms
= 8-10 ohms
= 9-11 ohms
= 6-8 ohms
Table V. Heater Assembly Checkout Procedures
Содержание ST 40A
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