SECTION 5:

REPAIRS & REPLACEMENT

PROCEDURES

5.01 Introduction

This Section describes parts replacement procedures and all repairs which may be performed on the Merlin 3000 Power Supply.

Under no circumstances are field repairs to be attemped on Printed Circuit Boards or other Subassemblies of this unit. Evidence of unauthorized repairs may void the fac- tory warranty.

5.02Anti-Static Handling Procedures

A. General

CAUTION

PC boards can be irreparably damaged by improper handling due to electrostatic discharge (ESD).

Replacement PC boards are shipped in a protective en- closure to prevent damage from electrostatic discharge (ESD) during shipping. Included with each replacement board is a ground strap to prevent static damage during installation.

WARNINGS

Read and understand these instructions and the instructions on the grounding wrist strap package before opening the equipment enclosure or remov- ing the replacement PC board from its protective enclosure.

Disconnect primary power to the system before dis- assembling the torch, torch leads, or power supply enclosure.

Do not operate the equipment or test equipment under power while wearing the grounding wrist strap.

B.Procedure

1.Open the wrist strap and unwrap the first two folds of the band. Wrap the adhesive side firmly around your wrist.

2.Unroll the rest of the band and peel the liner from the copper foil at the opposite end.

3.Attach the copper foil to a convenient and exposed electrical ground.

4.Connect the equipment primary cable ground to the same electrical ground as the wrist strap.

5.Open the equipment enclosure (see instruction manual for the appropriate equipment) and re- move the failed PC board.

6.Carefully open the ESD protective bag and remove the replacement PC board.

7.Install the replacement PC board in the equipment and make all necessary connections.

8.Place the failed PC board in the ESD protective bag and seal for return shipping.

9.Reassemble the equipment enclosure (see instruc- tion manual for the appropriate equipment).

10.Remove the grounding wrist strap from your wrist and from the electrical ground connection before reconnecting primary power to the equipment.

5.03Parts Replacement - General Information

The parts replacement procedures described in this manual, except for Rear Panel Coolant Filter and exter- nal Fuse(s) replacement, require that the Power Supply be disassembled. Depending on the part to be replaced will determine to what extent the Power Supply must be disassembled.

NOTES

Before removing any electrical connection mark each wire with the connection designation. When reassembling this makes sure the wires go to the proper terminals.

Note the routing of wires and make sure the wires are put back in the same place when reassembling the unit.

Turn OFF all gas inputs to the Power Supply at the source before diconnecting any gas Hose As- semblies.

Each Subsection is referenced to Section 6 for parts lists and overall detailed drawing.

Manual 0-2533

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REPLACEMENT PROCEDURES

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Thermal Comfort 3000 manual Section Repairs & Replacement Procedures, Anti-Static Handling Procedures, General
Page 36 Page 38

3000 specifications

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