Handpieces - Pace MBT 201 Operation & Maintenance Manual

Corrective Maintenance
CORRECTIVE MAINTENANCE

Handpieces

The following "Heater Assembly Checkout Procedures" are applicable to all PACE handpieces except for
the TT-65 ThermoTweez handpiece. Refer to either of the TT-65 manuals (P/N 5050-0300 or 5050-0336)
for troubleshooting procedures pertinent to that handpiece.
Perform the "Heater Assembly Checkout Procedures" with the handpiece (and heater) at room
temperature. If the handpiece is warm, resistance readings will be different from those shown.
Symptom
No Heat
Handpiece
is
overheating
Fuse blows
when unit is
turned on.
No ground
on tip.
Checkout Procedure
Check resistance Pin 2
to Pin 5. Refer to
Heater Specs. column
at right.
If resistance is high -
Check resistance Pin 3
to Pin 6.
If circuit reads open -
Check resistance Pin 3
to Pin 6. Resistance
should be 110 Ohms. If
circuit resistance reads
less than 105 Ohms -
Check resistance Pin 2
to Pin 5. Refer to
Heater Specs. column
at right.
If resistance is low –
Check resistance Pin 4
to a new tip. Resistance
should be less than 2
Ohms.
If not -
Table I. Heater Assembly Checkout Procedures
Cause Solution
Open Replace Heater
heater assembly.
Replace Heater
Open Assembly
sensor
Shorted Replace Heater
sensor. Assembly.
Solder Remove short.
short in Replace Heater
handpiece Assembly and
Fuse F1
Shorted Replace Heater
Heater Assembly and
Fuse F1.
Oxidation Clean Heater
buildup in Bore with wire
Heater brush.
Bore
Defective Replace Heater
Heater Assembly.
Heater Specs.
SX-80 = 8.6 – 9.1 !
PS-90 = 8.7 – 9.4 !
TP-65 = 9.2 – 10.2 !
TJ-70 = 5.8 – 6.3 !
PS-70 = 11.3 – 12.3 !
TT-65 = 10.7 – 11.9 !
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