Tweco 100 Auto-Cut - Manual (Page 76)

MAINTENANCE 5-4 Manual No. 0-4764
5.05 Arc Starter Service
Arc Starter Service Chart
Symptom Cause Check Remedy
No Pilot ignition:
Spark in Arc Starter
but no ignition
Coolant has become
conductive
Use conductivity meter
Flush system,
replace coolant.
Pilot return wire not connected Visual inspection Connect Wire.
Spark gap set too close Check with feeler gauge Set to 0.063" ±0.002"
High Frequency cap (C4)
possibly open
Use capacitance meter Reconnect or replace.
Broken or missing ferrites Visual inspection Replace.
Short across in inductor (L1) Visual inspection
Remove short;
increase coil gaps.
Spark gap bus caps
(C1, C2, C3)
broken or defective
Capacitance meter Replace.
Negative supply not
connected correctly
Visual inspection Reconnect.
No Pilot ignition:
No Spark
in Arc Starter
Spark gap set too large Check with feeler gauge Set to 0.063" ±0.002"
Faulty transformer Resistance measurement Replace.
No 120V supply Check input voltage at EMI filter Make connections;
replace harness.
No/ loose connection
to spark gap
Visual inspection Reconnect.
Faulty EMI filter Voltage/ Resistor measurement Replace.
No cooling or
insufficient cooling:
Leaks coolant
Loose fitting(s) Visual inspection Tighten fittings.
Failure to braze joints (L1) Visual inspection Replace HF Coil.
Damaged or punctured
coolant line(s).
Visual inspection Replace coolant line(s).
No cooling or
insufficient cooling:
No Coolant Flow
Supply & return hose reversed Visual Inspection of color-coded
connections
Match coolant connection colors
to arc starter fitting colors.
Blockage in coil or
supply/return hoses
Loosen fitting slightly and check
for coolant flow
Flush system.
Erratic System
Behavior
(EMI Interference)
Shield Drain / Torch lead inner
shield connector
missing or loose.
Visual inspection of lead
attachment to Arc Starter
Reconnect / tighten
lead connectors.
Missing or loose
ground connection
Visual inspection of ground wire
to Arc Starter
Make or tighten
connections to
good ground.
Cap C5 not connected,
open or loose
Visual inspection / capacitor
measurement
Replace PCB.