Prest-O-Lite 550 Instruction Manual page 32

sectioN 6
B. no air
Is air hose connected?
Yes
Is air adjusted to 55 - 65psi (4 - 5 bar)?
Yes
Does air come on with air check switch?
Yes
Check continuity of torch switch
OK
Repair /replace power source
c. air does not shut off
Does arc start when nozzle contacts work without depressing torch switch?
Yes
Check for short in torch switch
Does air flow even when Prest-O-Lite
Yes
Replace
solenoid valve
No
No
No
No
550 power switch is OFF?
®
Repair/replace control
32
trouBleshootiNg
Connect
Adjust
• No electrode in torch
• No valve pin in torch
• Replace electrode
• Replace valve pin
Replace torch switch
No
No
PCB