Weller DEC1001 - Manual (Page 3)

Fuse open - replace. Fuseholder located under base. Use 1.6 Amp Fuse (1 Amp 5x20mm fuse on 240VAC).
Line cord open - replace
Transformer defective - replace.
1.2 Either heater on indicator illuminates.
1.2.1 Troubleshoot soldering tool.
1.2.2 Check switch for side that is inoperative.
1.2.3 Check continuity from receptacle pins to control board. Repair as required.
1.2.4 Replace control board.
2. Tool overheating.
2.1 Troubleshoot soldering tool.
2.2 Replace control board.
3. Tool does not pass calibration check or tip temperature testing shows errors in tip temperature greater than ±10°F
(±6°C).
3.1 Tip temperature testing errors.
3.1.1 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 gauge
thermocouple wire will cause errors.
3.1.2 Replace soldering tool with different tool and recheck tip temperature. If this corrects the readings, the
sensor in the original soldering tool should be replaced.
3.2 Calibration errors.
The following assumes use of a WC1000 Calibration Reference Unit or precision resistors and 13 ohm 40 watt load
with lamp.
3.2.1
Unit out of calibration equal amount on both A and B resistors.
Loosen setscrew on temperature set knob and rotate knob to align with correct temperature.
3.2.2 Replace control board.
4. High tip voltage or indication of circuit component damage.
4.1 Check for 2 ohms maximum from tip to ground prong on line cord plug, repair as required.
DEC1001 POWER UNIT 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 four rubber feet, four bottom screws and top case.
1. Tool does not heat.
1.1 Neither heater on indicator LED illuminates.
1.1.1 Check power line for correct voltage.
1.1.2 Check for 12-15 ohms at line cord blades.