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TROUBLESHOOTING AND REPAIR
MAIN INVERTER BOARD
“WELDING LOGIC AND INVERTER” SECTION TEST (continued)
F-45 F-45
V205-T AC/DC
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TABLE F.14 LED FUNCTIONS
TABLE F.15 FEEDBACK VOLTAGE SIGNALS
Machine/Mode
ON/STICK
ON
ON
Component
L8
L9
TP31-TP9
Value
-------
-------
2.56 VDC
Condition
ON
OFF
-------
Note
POT SIGNAL
THERMAL
ALWAYS
Machine/Mode
ON/TIG
Component
TP15-TP14
Value
-2 VDC @ 100A
-4 VDC @ 200A
Condition
WELDING ON:
CURRENT
FEEDBACK
ON/STICK TP16-TP14 4.3 VDC O.C.V. WELDING ON:
VOLTAGE
FEEDBACK
ON/TIG TP19-TP14 2 VDC @ 100A
4 VDC @ 200A
WELDING ON:
CURRENT
REFERENCE
TABLE F.16 VOLTAGE CHECKS WITH 115 VAC APPLIED TO MACHINE
Generator/Mode
ON/STICK
ON/STICK
ON/STICK
ON/STICK
Component
MF11
MF12
MF15
MF16
G[+],S[-]
3.75 VDC
3.75 VDC
3.75 VDC
3.75 VDC
D[+],S[-]
178 VDC
260 VDC
260 VDC
34 VDC
TABLE F.17 LED (CHECK IN STICK MODE)
Generator/Mode
ON/STICK
ON/STICK
ON/STICK
ON/STICK
Component
L11
L12
L13
L14
Value
ON
ON
ON
ON