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T R O U B L E S H O O T I N G
1. CHECK CPU & PSIO BOARDS VISUALLY
a. Check CPU board to insure all integrated circuits are seated properly. Check for broken
leads on individual components. Insure ribbon cable is seated properly. (Newer version does
not have a ribbon cable.)
b. Check PSIO board for fuses in both positions. Check integrated circuit for proper seating.
Check component leads for breakage.
2. CHECK BASIC POWER REQUIREMENTS
a. Check for 110 vac input at the rear terminal strip on PSIO board.
b. Check fuse F1 (1A 250V) on PSIO board.
c. Check fuse F2 (1A 250V) on PSIO board.
d. Check for 16-18 vac from the top of D2 to the top of D3 on the PSIO board.
e. Check the 5 vdc to ground at the top left front of CPU board at JP4 test point.
3. CHECK BASIC CONTROL START UP
a. Power ON.
b. All displays dark for 1 to 2 seconds.
c. Line frequency displayed for 1 second.
d. Weld Schedule #in window and Weld Schedule LED lit or “88” if footswitch closed. (Check
ST1 and/or ST2 if lit).
e. Weld Schedule LED lit all others OFF. (Repeat, Weld, Seam & Dress LEDs independent
operation.
4. CHECK CONTROLLER INPUTS
a. Verify Weld Schedule LED lit and no 110 vac output on Air, Mtr. & Tip terminals. (Outputs
must have loads) (Mtr. and tip only if options installed.)
b. Depress footswitch, first position and verify LED D8 lights and 110 vac appears at WELD
terminals.
c. With Weld Off, depress second position and verify LED D7 lights and 110 vac at Mtr.,
terminal with SEAM option.
d. Release footswitch. Depress Key C and verify LED D9 lights and 110 vac at Tip terminal
with DRESS option.
I N I T I A L C H E C K
1. Voltages
All voltages are referenced to ground.
PSIO
JP1 11,12
Ground
JP1-13,14
12 VDC to 14 VDC
1 VAC. Max.
JPT-9
10 VAC +/- 1 VAC, 60 HZ
TBI-9
11 VDC to 13 VDC
CPU
JP4-3
5VDC +/- 0.25
5 VAC Max.