Power Source; Handpieces - Pace ST 45 Operation And Maintenance Manual

Power Source

Most malfunctions are simple and easy to correct. Refer to Table 3.
Symptom
No power to
system
Handpiece will
not heat

Handpieces

The following "Heater Assembly Checkout Procedures" (Table 4) is applicable to all PACE
SensaTemp handpieces used with the ST 45 or ST 55 system except for the TT-65 and DTP-80
handpieces. Refer to the applicable manuals for troubleshooting procedures pertinent to these
handpieces.
Perform the procedures with the handpiece heater at room temperature. If the heater is warm,
resistance readings will be different from those shown in Table 4. 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.
System
Handpiece does not heat
Handpiece Overheating
Fuse blows when power
source is turned on
No Ground on Tip
©2001 PACE Inc., Laurel, Maryland
All Rights Reserved
The handpiece heater assembly sensor is open. Refer to table 4
to check handpiece.
The handpiece heater assembly sensor is shorted. Refer to
Table 4 to check handpiece.
The handpiece heater assembly may be defective. Refer to
Table 4 to check handpiece.
Power source malfunction. Contact PACE or your authorized
local representative for assistance.
Table 2: LED Display Message Codes
Probable Cause Solution
Blown Fuse Check handpiece using table 4. Replace the fuse
(located in the AC Receptacle Fuse Holder) with
one of the same rated value (see Table 6, Spare
Parts)
Defective Heater See Table 4.
Power Source Contact PACE
Malfunction
Table 3: Power Source Corrective Maintenance
Checkout Procedure
Check resistance: Pin 2 to
Pin 5. Refer to heater
specifications below if
resistance is high, see
Solution
Check resistance: Pin 3 to
Pin 6. If circuit reads open,
see Solution
Check Resistance: Pin 3 to
Pin 6. Resistance should
be 110 ohms. If resistance
is less than 105 Ohms, see
Solution
Check resistance: Pin 2 to
Pin 5. Refer to heater
specifications below if
resistance is low, see
Solution
Check resistance: Pin 4 to
a new tip. Resistance
should be less than 2 ohms,
if not see Solution
Cause
Open Heater
Open Sensor
Shorted Sensor
Shorted Heater
Oxidation build-up in heater
Bore
Solution
Replace Heater Assembly
Replace Heater Assembly
Replace Heater Assembly
Replace Heater Assembly
and Fuse
Clean Heater Bore using
wire brush
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