SERVICE TROUBLESHOOTING
20
Manual 0-2587
A-01400
Pilot Output PC Board
E23
Wire #17
E24
Wire #16
7. Faulty Logic PC Board
Measure for 15 VDC on Logic PC Board from J5-6
to J5-7.
a. If voltage is less than 10 VDC, replace Logic PC
Board
8. Faulty PCR Relay
Install a jumper between wires #12 and #14. Re-
try piloting again.
a. If torch pilots with jumper installed, replace PCR
Relay
4.08 Main Arc Problems
Locate your symptom below:
A. Main cutting arc will not initiate
1. Work cable not connected.
a. Connect work cable.
2. Work cable not routed properly inside power supply
a. Check that the end of the work cable passes
through the current sensor on the Logic PC
Board.
b. Check that the ring terminal on the end of the
work cable is securely connected to the Output
PC Board at E29.
3. Faulty current sensor
Check the following indicators inside the Power
Supply:
• Pilot indicator (D33) on the Logic PC Board is
ON during pilot then OFF during main arc
transfer
• CSR indicator (D31) on the Logic PC Board is
OFF during pilot then ON during main arc
transfer
A-01393
Logic PC Board
D31
D33
4.09 Test Procedures
The test procedures in this subsection are referenced in
the troubleshooting section.
A. Safety Precautions
1. Significant DC Voltage exists after removal of input
power. Allow 2 minutes for discharge time. Voltage
measured on input capacitors must be zero before
performing service on the power supply.
2. Do Not touch electrical components with any part of
the human body when power is applied.
3. Keep away from any moving parts.
4. Hot surfaces can cause severe burns. Allow equip-
ment to cool before servicing.
5. Electrostatic discharge can damage printed circuit
board assemblies. Transport printed circuit boards in
proper anti-static shielded packages. Use proper
grounding techniques with wrist strap before handling
printed circuit boards.
Summary of Contents for Thermal Dynamics PAK MASTER 50XL
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Page 16: ...INTRODUCTION 10 Manual 0 2587...
Page 45: ...Manual 0 2587 39 PARTS LISTS A 01381 2 1 3 4 5 2...
Page 47: ...Manual 0 2587 41 PARTS LISTS A 01065 1 2 3 4 5 6 7 8...
Page 49: ...Manual 0 2587 43 PARTS LISTS A 01382 2 4 1 3 5...
Page 53: ...Manual 0 2587 47 PARTS LISTS A 01068 1 6 2 14 12 16 10 15 9 8 7 3 5 5 4 13 17 11...
Page 55: ...Manual 0 2587 49 PARTS LISTS A 01383 14 6 2 11 13 15 7 12 3 8 10 9 4 1 5...
Page 72: ...APPENDIX 66 Manual 0 2587 APPENDIX XII SYSTEM SCHEMATIC A 01370 1 2 1 2...
Page 73: ...Manual 0 2587 67 APPENDIX A 01370 B EC 8055 HAS 11 23 98...
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