SX-70
14
Table 1. Heater Assembly Checkout Procedures
Sympto
Sympto
Sympto
Sympto
Checkout Procedure
Checkout Procedure
Checkout Procedure
Checkout Procedure
Ca us e
Ca us e
Ca us e
Ca us e
S o l u t i o n
S o l u t i o n
S o l u t i o n
S o l u t i o n
No heat
Check resistance - Pin 2 to Pin
5. Resistance should be 8.2
to
9.5 ohms. If not - -
Open Heater
Replace Heater
Check resistance - Pin 3 to Pin
6.
If circuit reads open - -
Open Sensor
Replace Heater
Handpiec
overheati
Check resistance - Pin 3 to Pin
6. Resistance should be 110
ohms. If circuit reads less than
105 ohms - -
Shorted Sensor Replace Heater
Fuse
blows
when unit
is
turned on
Check resistance - Pin 2 to Pin
5. Resistance should be 8.2
to
9.5 ohms. If not - -
Shorted Heater
Replace Heater
Assembly
N
Ch
k
i t
Pi 4 t
O id ti
Cl
H
t
Handpiece Connector Plug
Corrective Maintenance
Your SX-70 requires no special maintenance other than being kept clean. The heater
bore and the heater assembly set screw which secures the tip must be kept free of
oxidation and debris in order to maintain the proper tip-to-ground resistance.
Refer to the Handpiece Connector Plug pin out illustration and Table 1 for
information on troubleshooting most handpiece problems. Disconnect the
handpiece from the Power Source and perform the "Heater Assembly Checkout
Procedures" with the handpiece (and heater) at room temperature. Use a meter to
check resistance across the Handpiece Connector Plug pins as outlined in the
"Checkout Procedure" column.
