Weller WESD51 - Manual (Page 4)

4
TIP TEMPERATURE TESTING ERRORS
NOTE: Tip temperature testing must be done using the K111, Type “K” Thermocoupled Tip temperature test kits. (see
Replacement Parts and Accessories Section). Other methods, which include Contact Pyrometers or large loading
devices such as heavier thermocouple wire, will cause errors. Replace soldering tool with known good tool and
recheck tip temperature.
· Refer to Tool Troubleshooting Guide
Adjust station according to Tip Temperature “Offset” Procedure.
HIGH TIP VOLTAGE
Replace soldering tool with known good tool and recheck tip voltage.
· Refer to Tool Troubleshooting Guide
Check for continuity from pin #5 of tool receptacle to line cord ground pin.
· Check wiring from tool receptacle to line cord ground pin - repair if defective.
MODEL PES51 50 WATT SOLDERING TOOL
PRODUCT DESCRIPTION
The Weller ® PES51 Soldering Pencil features a Nichrome wound, stainless steel heater element construction, a non-burning silicone rubber
cord and a large selection of Iron, Nickel and Chrome Plated, Copper tips in various styles, including tips for surface mount devices. The
handle design is lightweight, high impact ESD plastic, with controlled thermal conductivity via a foam sleeve to allow continuous use without
discomfort from heat or fatigue. The heating element is a fast response, long life, Nichrome wound, unit encased in stainless to eliminate
corrosion at high temperature.
The Weller
® PES51 tools are interchangeable without the need to make adjustments to the station “Offset” function. This is made possible by
the use of a precision temperature sensor; which is positioned deep inside the tip to insure rapid response to soldering load variations.
The Weller
® PES51 tool has been specifically designed for use at electrostatic free workstations and is completely free from stored static charges.
The plastic used in this product meets the requirements for Electrostatic Protective Materials. All Weller ® ESD tools comply with DOD-HDBK-263.
The Weller ® PES51 tool is designed to be used with the WES51& WESD51 series power units. The station and tool combination meets DOD-STD-
2000, MIL-S-2000, MIL-S-45743, W-S-570 as well as DOD-STD-1686.
PES51 SERIES SOLDERING TOOL TROUBLESHOOTING GUIDE
CAUTION: Disconnect from power unit before attempting repairs.
NOTE: If ground pin has been removed from power unit line cord, tip temperature control may be erratic.
1. Tool does not heat.
1.1 Check heater resistance from pin 2 to pin 6 (see Figure 1) of the tool connector, should measure 9 - 11 ohms.
1.1.1 Proceed to 1.2 if heater is correct.
1.1.2 Remove heater/sensor assembly from handle and check resistance at heating element wires.
1.1.2.1 Remove tip barrel/nut and tip.
1.1.2.2 Attach 3/8 - 24 nut to heater.
1.1.2.3 Release cord strain relief by pushing cord 1/4" to 1/2" into handle.
1.1.2.4 Clamp 3/8 - 24 nut in vise, pull and wiggle handle side-to-side to disengage heater.
1.1.3 Replace cord/handle assembly if heater is correct; else replace heater/sensor assembly, complete instructions are
provided with replacement part.
1.2 Check sensor resistance from pin 3 to pin 4 of the tool connector, should measure 1 - 2 ohms.
1.2.1 If sensor resistance is incorrect, remove heater/sensor assembly from handle and check at the sensor leads.
1.2.2 Replace cord/handle assembly if sensor is correct; else replace heater/sensor assembly.
1.2.3 Check resistance from pin 3 to pins 2 and 6 of the tool connector, should measure 1 meg ohm minimum.
1.2.4 Remove heater/sensor assembly from handle and check for shorts in wiring inside handle. Repair or replace as
required.
2. Tool overheating. (NOTE: Tool will overheat with tip removed).
2.1 Check resistance from pin 3 to pin 4 of the tool connector, should measure at least 1- 2 ohms.
2.1.1 Remove heater/sensor assembly and check for shorts in wiring inside handle. Repair wiring as required, or replace cord/
handle assembly, complete instructions are provided with replacement part.