E-5

 

TROUBLESHOOTING

E-5

 

 

 

 

 

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

PROBLEMS

POSSIBLE

RECOMMENDED

 

 

(SYMPTOMS)

CAUSE

COURSE OF ACTION

 

 

 

 

 

 

PRESET & OUTPUT CONTROL PROBLEMS

Meter does not display preset

1. Faulty potentiometer R1 or its con-

 

 

 

nection

 

 

2.

Bad connection at P9 of Control

 

 

 

PC board

 

 

3.

Faulty Advanced Control PC board

 

 

 

( if present ) or its connection to

 

 

 

the main Control PC board

 

 

4.

Missing plug P3 on Control board

 

 

 

or bad connection at P3 when an

 

 

 

Advanced Control PC board is not

 

 

 

present

 

 

 

High output current in both DC & AC

1.

Bad connection at P6 of Control

polarities regardless of preset

 

PC board

 

 

2.

Bad shunt connection

 

 

3.

Faulty Control PC board

 

 

4.

Faulty SCR bridge

 

 

 

High output current in DC polarity

1.

Shorted free wheeling diode D1

regardless of preset, o.k. in AC polar-

 

 

ity

 

 

 

 

 

 

In 2-step Tig, output stays on for

1.

Bad 2/4 step switch or its connec-

more than downslope time after trig-

 

tion

ger open (machine with Advanced

 

 

Control panel only)

2.

Bad connection at P1 of Advanced

 

 

 

Control PC board

 

 

 

Output stays on after releasing

1.

Downslope is not set at min.

hand/foot

Amptrol (machine with

 

 

Advanced

Control panel only)

2.

Bad Downslope potentiometer

 

 

 

R12 or its connection

 

 

 

 

 

 

 

 

If all recommended possible areas of misadjustment have been checked and the problem persists, Contact your local Lincoln Authorized Field Service Facility.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

PRECISION TIG 275

Page 35
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Lincoln Electric IM702-A manual Preset & Output Control Problems

IM702-A specifications

The Lincoln Electric IM702-A is a versatile and innovative welding machine that has garnered attention for its advanced features and robust performance. Designed for various welding applications, the IM702-A is a go-to choice for professionals in the industry, offering precision, reliability, and ease of use.

One of the standout characteristics of the IM702-A is its advanced inverter technology. This allows for a lightweight and compact design, making it easier to maneuver in tight spaces compared to traditional welding machines. The inverter technology also contributes to energy efficiency, reducing power consumption without compromising on performance.

The IM702-A features a multi-process capability, enabling it to perform MIG, TIG, and Stick welding with ease. This versatility makes it ideal for a wide range of projects, from industrial manufacturing to home repairs. Users can seamlessly switch between different welding processes, enhancing productivity and streamlining workflow.

In terms of user interface, the Lincoln Electric IM702-A is designed with convenience in mind. It boasts a digital display that provides real-time information on welding parameters, making it easier for operators to monitor and adjust settings as needed. The intuitive controls are user-friendly, allowing even novice welders to achieve professional-quality results.

The machine also includes advanced weld control features, such as precise amperage and voltage adjustments. These controls ensure that users can achieve optimal settings for different materials and thicknesses, resulting in clean, strong welds. Additionally, the IM702-A is equipped with an automatic voltage adjustment feature, which helps maintain consistent performance under varying input conditions.

Durability is another key selling point for the IM702-A. Built with high-quality materials and engineering, this welding machine is designed to withstand the rigors of daily use in demanding environments. Its rugged construction provides reliability and longevity, ensuring that it remains a valuable asset in any workshop.

Lastly, safety is a priority in the design of the IM702-A. It includes several built-in safety features, such as thermal overload protection and a stabilized arc performance that reduces the risk of arc blow, protecting both the operator and the equipment.

Overall, the Lincoln Electric IM702-A stands out in the welding market due to its advanced technologies, multi-process capabilities, user-friendly interface, and robust safety features, making it an excellent choice for professional welders seeking high-quality performance and versatility.