Weller WESD51 - OPERATIONAL SETTINGS AND FEATURES; TROUBLESHOOTING GUIDE; TOOL DOES NOT HEAT

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3. Apply the Lockout Pencil to the ESD symbol on the front panel. The single decimal point in the MSD (Most Significant

Digit) will slowly blink for approximately 3 seconds. At this point, the single decimal point in the MD (Middle Digit) will

begin to flash, indicating that it is in the Offset mode. Adjust the digital display to where it matches the measured tip

temperature. Now remove the Lockout Pencil and the temperature Offset procedure is complete. The Offset is retained

when the station power is turned off.

Note: The Offset allows for approximately +/- 75° F (42° C) adjustment capability. If the measured error is greater

than +/- 75° F (42° C), the station will reject the input by continuously displaying NO on the digital display,

until the Lockout Probe is removed from the panel. At this point, the Offset procedure (Step 3 above) must

be repeated with an offset used, within the acceptable range.

RESET STATION TO FACTORY DEFAULT SETTINGS

With the station power turned Off, adjust the temperature set knob to the lowest setting: 350°F (177°C). Apply the Lockout Pencil

to the ESD symbol on the front panel and turn the station On. Remove the Lockout Pencil and the procedure is complete. Any tip

temperature Offset programmed into the memory will now be reset to the nominal factory settings. Lockout will also be cleared.

AUTO OFF FEATURE

The Weller

Model WESD51 Model Station will automatically shut off power to the tool and the digital display after 99 minutes of

inactivity of the iron. Certain applications may not be recognized by the Loading Effect or Temperature Drop on the tool and may

require more frequent wiping of the tip on the damp sponge, to recognize use.

°F/°C OPERATION

The WESD51 Station will display temperature in either °F or °C. The factory default is °F. To change the display to °C, turn the

station off and adjust the temperature set knob fully clockwise to the maximum temperature setting. Apply the Lockout Pencil to the

ESD symbol on the front panel and turn the station on. Remove the Lockout Pencil. After a brief display test, the display will read all

temperatures in °C. Repeat the procedure to toggle back to °F.

TROUBLESHOOTING GUIDE

WARNING: AC line voltage is present inside power unit even when power switch is off. Refer service to qualified personnel.

NOTE: Access to internal parts, may be gained by removing the four rubber feet, four screws under feet and top case.

TOOL DOES NOT HEAT

With line cord unplugged and power switch on, check for approximately 21 ohms at line cord blades (55 ohms for 230V unit).

· Check power switch for continuity in the On position - replace if defective.

· Check line cord for continuity - repair or replace if defective.

· Check transformer primary - replace transformer if defective.

With line cord plugged in and power switch on, check for 24VAC ±10% between pins #2 and #6 of tool recep

tacle.

· 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.

· Refer to Tool Troubleshooting Guide

· Replace printed circuit board assembly.

TOOL OVERHEATING

Replace soldering tool with known good tool and recheck.

· Refer to Tool Troubleshooting Guide

Replace printed circuit board assembly in station.

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Weller WESD51 - OPERATIONAL SETTINGS AND FEATURES; TROUBLESHOOTING GUIDE; TOOL DOES NOT HEAT

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