37
Corrective Maintenance
Table 4. Heater Assembly Checkout Procedures
Connector
Plug Pinouts
Handpieces
The following “Heater Assembly Checkout Procedures” (Table 4) is applicable to
all PACE SensaTemp handpieces used with the ST 85 system except for the TT-
65 and DTP-80 handpieces. Refer to the applicable manuals for troubleshooting
procedures pertinent to that handpiece.
Perform the procedures with the handpiece heater at room temperature. If the heater
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
Handpiece
does not heat.
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.
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 - -
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
PS-80 = 8 - 10 o hms
PS-80 = 8 - 10 o hms
PS-80 = 8 - 10 o hms
PS-80 = 8 - 10 o hms
SX-80 = 8 - 10 o hms
SX-80 = 8 - 10 o hms
SX-80 = 8 - 10 o hms
SX-80 = 8 - 10 o hms
SX-70 = 8 - 10 o hms
SX-70 = 8 - 10 o hms
SX-70 = 8 - 10 o hms
SX-70 = 8 - 10 o hms
TP-65 = 9 - 11 ohms
TP-65 = 9 - 11 ohms
TP-65 = 9 - 11 ohms
TP-65 = 9 - 11 ohms
TJ-70 = 6 - 8 o hms
TJ-70 = 6 - 8 o hms
TJ-70 = 6 - 8 o hms
TJ-70 = 6 - 8 o hms
