2.1 TROUBLE SHOOTING GUIDE
Forward / Reverse
revolutions not functioning
correctly.
A. Footswitch is damaged
：
(1) Measure footswitch connector Pin 1&2, step on the footswitch and
measure Pin 1&2 is shorted. if not, replace a new footswitch.
(2) Step on the footswitch and check if relay board D11 illuminates, if
yes ,but has no action, replace a new relay board.
B. Forward / Reverse revolution switch is damaged
：
(1) Switch to "Forward" position and check if Relay board D3
illuminates, if not, please replace the front panel board.
(2) Switch to "Reverse" position and check if Relay board D4
illuminates, if not, please replace the front panel board.
C. K1 ~ K4 relay is damaged
：
(1) Switch to "Forward" position and if Relay board
relay has no action, please replace the relay board.
(2) Switch to "Reverse" position and if Relay board
relay has no action please replace the relay board.
Can not adjust speed.
A. Motor control PCB is damaged
：
(1) Check the motor control PCB. It should have an input voltage of
30VDC between DC+ & DC-.
(2) Adjustment weld speed, measure A1 & A2, it should read approx.
6.5VDC, if not, voltage replace the motor control PCB.
B. Weld / Speed switch is damaged (Weld /Full speed)
：
(1) Switch to Manual mode and adjust the weld speed dial to about 50%
of the full speed, then step on the footswitch.
(2) Switch to both weld and speed positions, the motor should respond
with slow and fast speeds respectively, if not then replace a new front
panel board.
C. The potentiometer is damaged
：
(1) Detach the Front panel board CN2 connector, use ohmmeter to
measure Pin 1 & 2.
(2) Rotate the weld speed variable resistor's and check if the resistance
value is changing. If not, please replace VR1.
Weld timer not functioning
A. T1 Timer is damaged
：
(1) Switch to "Auto" position and step on the footswitch.
(2) CheckT1 the motion window of the timer, the "UP" signal should lit, if
not, please replace relay board.
B. T1 The Timer is unable to stop
：
(1) Detach the Relay board J1 connector, measure Pin 1&2.
(2) T
Rotate the timer knob and see if the resistance between Pin 1&2 is
changing from 0~1M ohm. If not, please replace the VR2 (Timer
knob).
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