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F-50 F-50
CONTROL PC BOARD TEST (continued)
CONTROL PC BOARD VOLTAGE TEST POINTS CHART
TROUBLESHOOTING & REPAIR
SQUARE WAVE TIG 355
Special
Signals Being Expected Conditions
Test Points Checked Reading for Test
3J13 to 5J13 Regulated +15VDC +15VDC None
supply to control
board
4J13 to 5J13 Regulated -15VDC -15VDC None
supply to control
board
1J13 to 2J13 Unregulated DC +12VDC None
supply to control
board
R11 to 5J13 Low logic signal for 0 - 2 VDC TIG Mode
gas/water valve Arc Start Switch or
Amptrol must be
activated
R32 to 5J13 Low logic signal for 0 - 2 VDC If input contactor is
interlock control staying closed signal
will normally be low.
R13 to 5J13 Low logic signal 0 - 2 VDC CAUTION: High
for high frequency frequency may
damage test
equipment.
Use analog
volt/ohmmeter
TIG Mode
High frequency is
active after gas
preflow time.
R66 to 5J13 Low logic signal for 0 - 2 VDC StickMode
DC OCV Boost DC Mode
(CR3) relay
R8 to 5J13 Low logic signal for 0 - 2 VDC Stick Mode
AC OCV Boost AC Mode
(CR2) relay