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Perform the "Heater Assembly Checkout Procedures" shown below with the
handpiece (and heater) at room temperature. If the handpiece is warm,
resistance reading will be different from those shown in the table below.
SYMPTOM
CHECKOUT
No heat
Check resistance - Pin 2 to 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 Pin 6.
overheating
Resistance should be 110 ohms.
If resistance reading is less than
105 ohms - -
Fuse blows
Check resistance - Pin 2 to Pin 5.
when unit is
Refer to "Heater Specifications"
turned on.
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 - -
Table 6. Heater Assembly Checkout Procedures
PROCEDURE
CAUSE
Open Heater
Open Sensor
Shorted Sensor
Solder short in
Handpiece.
Shorted Heater
Oxidation buildup
in Heater Bore.
Defective Heater
NOTE
SOLUTION
Replace Heater
Assembly.
Replace Heater
Assembly.
Replace Heater
Assembly.
Remove Short.
Replace Heater
Assembly & Fuse F1.
Replace Heater
Assembly & Fuse F1.
Clean Heater Bore
using appropriate wire
brush.
Replace Heater
Assembly.
HEATER
SPECIFICATIONS
SX-70
= 8 - 10 ohms
SP-1A
= 10 - 12 ohms
SP-2A
= 8 - 10 ohms
T P - 6 5
= 9 - 11 ohms
TJ-70
= 6 - 8 ohms
105
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