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System booklet (PACE P/N 5050-0251) as a guide to accurately set and maintain a true tip
temperature for any size and type of SMT tip.
Variable Temperature Control
Adjust the Variable Temperature Control Knob to the desired temperature
setting.
Notice that the control panel has an outer graphic scale denoting
temperature in °C (Celsius) and an inner graphic scale denoting temperature in
°F (Fahrenheit). These numerical scales denote the set tip temperature times
100 (e.g., "3" on the outer scale is 3 x 100 or 300°C).
Temperature/Dial Lock
The Variable Temperature Control Knob can be locked in position to avoid
accidental or unauthorized changes of the temperature setting.
1. Adjust the Temp. Control Knob to the desired temperature setting.
2. Using the Temp. Locking Key (hex key supplied with system), tighten the
set screw on the Temp. Locking Ring closest to the front panel.
LED Operation
The Green colored LED on the power source front panel indicates System Status and Power
Receptacle output status (LED OFF, ON or Flashing).
LED Full On - Continuous power is being delivered to the handpiece.
This condition is evident when the system is first powered up (handpiece
heater cold) or the Variable Temperature Control setting is increased.
LED Flashing - Indicates that the set tip temperature (as set on the
Variable Temperature Control) has been reached.
handpiece is cycling Off and On to maintain set temperature.
LED Off - No power is being delivered to the handpiece heater. This condition is evident for a
short period of time when set temperature is reached and stabilizing or if the Variable
Temperature Control setting is decreased.
handpiece (see Corrective Maintenance section). Also, if no handpiece is connected to the
power source, the LED will not illuminate.
Temperature Dial Adjustment
The ST 125 system is tested for temperature accuracy at the factory and can be checked for
calibration according to PACE requirements.
operator can be adjusted to the precise temperature indicated on the Dial/Display. No internal
adjustments can be made to the power supply. To verify calibration of the Temperature selection
dial, perform the following procedure.
1. Install a tip with an embedded thermocouple into the handpiece connected to
the system. Tips with K type thermocouples are available from PACE.
2. Connect the thermocouple assembly to an appropriate temperature meter.
3. When set fully counterclockwise, the pointer of the Variable Temperature
Control knob will align to the Calibration Mark as shown. With the system turned on,
adjust the Variable Temperature Control to obtain a stable tip temperature of 300°C (for
©2004 PACE Inc., Annapolis Junction, Maryland
All Rights Reserved
Power to the
If the LED never illuminates, check for a faulty
Also, a temperature setting normally used by the
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