Tweco FP-38 Power Supply - Manual (Page 33)

Manual 0-2967 5-7 SERVICE
F. AC indicator ON; TEMP indicator ON
1. Air flow blocked
a. Check for blocked air flow around the unit and correct condition.
2. Fan blocked
a. Check and correct condition.
3. Unit is overheated
a. Let unit cool down for at least 5 minutes. Make sure the unit has not been operated beyond Duty Cycle limit.
Refer to duty cycle data in Section 2.
4. Faulty components in unit
a. Return for repair or have qualified technician repair per Service Manual.
G. Torch will not pilot when torch switch is activated; AC indicator ON, TEMP indicator OFF, DC
indicator OFF
1. System is in SET mode
a. Release torch trigger. Change power supply RUN/SET switch to RUN (up) position.
2. Torch Head upper O-ring in wrong position.
a. Remove shield cup from torch. Check position of upper O-ring. Correct if necessary.
Lower O-Ring
Upper O-Ring
in Correct Groove
Upper Groove
with Vent Holes
Must Remain Open
Threads
A-03640
3. Faulty torch parts
a. Release torch trigger. Turn power supply OFF. Remove and inspect torch consumable parts. Replace if
necessary.
4. Gas pressure too high or too low
a. Adjust to proper pressure.
5. Faulty components in unit
a. Return for repair or have qualified technician repair per Service Manual.