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TROUBLESHOOTING & REPAIR
F-84 F-84
COMMANDER 400
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CONTROL PC BOARD REMOVAL AND REPLACEMENT (continued)
CALIBRATION PROCEDURE
(Stick and Wire Model Only)
1. Set the front control panel as follows:
”Control” dial to 0 (Min.).
“Range” dial to the ‘Wire Welding’ setting.
“Idler” switch in the “Auto” position.
“Volts/Amps” switch to the ‘volts’ position.
“Output Control switch to the “Welding
Terminals Remotely Controlled” position.
2. Connect the volt/ohm meter across the “+”
and “- WIRE” (CV) terminals.
3. Start the unit.
While the unit is running
there are high voltages
present inside the control
box. THE VOLTAGES
ARE HIGH ENOUGH TO
KILL. Keep hands out of
the control box while the unit is running.
4. As the unit begins to run, the display will step
quickly through its initialization sequence. As
soon as the display shows three dashes
(“---”) begin to toggle the “Idler” switch from
“AUTO” to “HIGH”. You must toggle the
switch a total of 5 times in 5 seconds from the
time that the dashes appeared on the display.
Failure to due so will result in the unit default-
ing to normal operation. The switch must be
returned to the “AUTO” position once the test
mode has been accessed. The display
should read “000”, indicating the step number
of the self test to be executed.
5. Toggle the “idler” switch to “HIGH” and back
to “AUTO.” The display should read “001.”
6. Toggle the “idler” switch to “HIGH” and back
to “AUTO.” The display should read “002.”
7. Toggle the “idler” switch to “HIGH” and back
to “AUTO.” The display should read “003.”
8. Set the Output Control switch to the “WELD-
ING TERMINALS ALWAYS ON” position.
9. Turn the “Control” dial until the display reads
“19.0.” Assure that there is no load applied to
the unit.
10. Toggle the “Idler” switch to “HIGH” and back
to “AUTO” continually until the voltage on the
voltmeter across the studs reads 19.0 ± .2
volts. If 19.0 ± .2 volts is passed by, continue
to toggle the “Idler” switch to “HIGH” and back
to “AUTO” and the voltage will eventually
wrap around to a value below 19 volts.
Continue to toggle the “idler” switch and try to
attain 19.0 ± .2 volts again. Once the voltage
across the terminals does read 19.0 ± .2
volts, proceed to the next step.
11. Set the Output Control switch to the ‘WELD-
ING TERMINALS REMOTELY CON-
TROLLED” position.
12. You have now completed the calibration pro-
cedure. Disconnect the volt/ohmmeter.
WARNING