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SECTION 5
5.2 TROUBLESHOOTING GUIDE
A. Power Light does not come on.
1. Visually inspect the machine for any damage.
2. Check following:
a. Check if the machine power cord is plugged into the input
power receptacle.
b. Measure the input power at the receptacle. If not present, then
check the wall disconnect switch and it's fuses.
c. Check Fuse (F1).
3. If above items check OK , the problem is internal. Send unit to an
Authorized Repair Station for repair.
a. Ensure that ribbon cable is connected to main PCB-1 and
front panel PCB-3
b. Measure voltage between pins P7-5 and P7-6
control board. If there is no voltage, then replace Control
Transformer (T6).
c. If the voltage is present, then the pilot light may be burnt
out.
B. No Air Flow
1. Check air inlet supply. Unit requires 350 cfh at 80psig.
2. Check air hose and connections. Tighten if leaking.
3. Does air flow when "air test" switch is in test position?
a. If not, check torch consumables, replace if necessary.
b. If above items check OK , the problem is internal. Take unit to
an Authorized Repair Station for repair.
C. The Power light is on, but nothing happens when the torch
switch is depressed. Fault light does not activate.
NOTE: Unplug high frequency connection before attempting to work
on this problem.
1. With the machine power on, depress the torch switch. On the control
board the LED 1 should be lit as long as the switch is depressed. If not
then check:
a. Turn power off to the machine. Unplug Control board. Put an
ohmmeter across J3-3 and J3-4 to take resistance reading.
Depress torch switch. Meter should read a short. If not, then
one of the following is not working properly:
b. Torch switch or the leads. Unplug the torch switch leads at the
machine. Put a meter across the two plug pins. Should read a
short when the torch switch is depressed. If not, then either
broken switch leads or malfunctioning switch.
2. Check transformer secondary voltages at the output diode modules.
164
TROUBLESHOOTING
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