Weller WES50 - Manual (Page 2)

ACTIVATION OF LOCKOUT FEATURE
1. Set the temperature set knob to the desired tip temperature.
2. Apply the Lockout Pencil to the ESD symbol on the front panel until the LED starts slowly (5 hz/sec) blinking red;
remove the Lockout Pencil within 2.5 seconds and the temperature setting will be locked in. The indicator LED
will be red and turning the temperature set knob will have no effect on the tip temperature.
3. Reverse the lockout by applying the Lockout Pencil to the ESD symbol until the LED is slowly blinking red;
remove the Lockout Pencil within 2.5 seconds and the temperature set knob will function normally and the
indicator LED will be green.
TIP TEMPERATURE CALIBRATION PROCEDURE
1. Monitor the tip temperature with a 30 gauge thermocouple resistance welded to the center of the wetted area,
tinning should be removed before welding. K-111 temperature test kits are recommended; see Replacement
Parts and Accessories Section.
2. Set the temperature set knob to the desired tip temperature and allow the tip temperature to stabilize.
3. Apply the Lockout Pencil to the ESD symbol on the front panel. The LED should slowly blink red for 2.5 seconds
and then slowly blink green; set the temperature set knob to the observed tip temperature, remove the Lockout
Pencil, and the calibration procedure is complete.
RESET STATION TO FACTORY NOMINAL CALIBRATION
With station turned off, set temperature set knob to 600°F (315°C), apply the Lockout Pencil to ESD symbol on front
panel and turn station on. Remove the Lockout Pencil and the procedure is complete. Any tip temperature calibration
programmed above will reset.
7. Use the appropriate soldering tool.
With line cord plugged in and power switch on, check for 24VAC ±10% between pins #2 and #4 of tool receptacle.
• Check transformer secondary for 24VAC ±10% - replace transformer if defective.
• Check wiring to printed circuit board assembly - repair or replace if defective.
• Replace printed circuit board assembly.
Check wiring from tool receptacle to printed circuit board.
• Repair or replace if defective.
Replace soldering tool with known good tool and recheck.
• Troubleshoot soldering tool using guide in tool tech sheet.
Replace printed circuit board assembly.
TOOL OVERHEATING
Replace soldering tool with known good tool and recheck.
• Troubleshoot soldering tool using guide in tool tech sheet.
Replace printed circuit board assembly in station.
TIP TEMPERATURE TESTING ERRORS
NOTE: Tip temperature testing must be done using 30 gauge thermocouple wire resistance welded to the center of
the wetted area on the tip, tinning should be removed before welding. Other methods, or heavier
thermocouple wire, will cause errors. K-111 temperature test kits are available; see Replacement Parts and
Accessories Section.
Replace soldering tool with known good tool and recheck tip temperature.
• Troubleshoot soldering tool using guide in tool tech sheet.
Calibrate station according to Tip Temperature Calibration Procedure.
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