Weller WESD51 User Manual

Page 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.

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.

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.