Thermal Dynamics PAK Master 150XL, Service Manual

Page: 39 / 90

Manual 0-2728 5-1 REPLACEMENT PROCEDURES
SECTION 5:
REPLACEMENT
PROCEDURES
5.01 Introduction
This section describes parts replacement procedures and
all cable repairs which may be performed on the Pak
Master 150XL CE Power Supply.
Under no circumstances are field repairs to be attempted
on Printed Circuits or other subassemblies of this unit.
Evidence of unauthorized repairs may void the factory
warranty.
5.02 Anti-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 re-
move 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 equip-
ment.
5.03 Parts Replacement - General
Information
The parts replacement procedures described in this
manual require that the Power Supply be disassembled.
The part to be replaced will determine to what extent the
Power Supply must be disassembled.
Before disassembling any part of the Power Supply first
read the procedure for the part to be replaced, then pro-
ceed with the disassembly.
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 disconnecting any gas Hose As-
semblies.
Each Subsection is referenced to Section 6 for parts lists
and overall detailed drawing.