Filter
Top Products
DC600 CONTROL
G3409-1
LED1
LED5
LED2
LED3
LED4
LED6
J2
J3
J1
2 (256)
(290) 7
(291) 8
1
(222)12
1 (210)
5 (231)
(255) 6
1
FIGURE F.2 – CONTROL BOARD LEDs
PC BOARD TROUBLESHOOTING GUIDE (continued)
CONTROL BOARD
1. With the DC-600 set for the Test Conditions, all
the LEDs except LED 4 should be lit.
2. LED 1 indicates the 120vac input to the Control
Board and should be ON whenever the Power
Switch is ON. If not check for voltage at leads 255
& 256 (J2- pin 6 & pin 3). If there is no voltage,
check the wiring from the input power circuit. See
the Wiring Diagram.
3. LED 2 indicates presence of Arc Voltage feedback
to the Control Board and should be ON. LED 2
increases in brilliance as the arc voltage increases.
If not ON check the voltage at leads 210+ (J3-pin1)
to lead 222- (J1-pin12).
4. LED 3 indicates that power is being applied to the
Fault Protection relay (CR-2) and should be ON
whenever the Power Switch is ON. Under a “fault”
condition, LED 3 will go OFF and LED 4 will turn
ON. See Protective Devices and Shutdown
Circuits.
5. LED 4 indicates an overload or “fault” condition and
is normally OFF. If it comes ON, the input contactor
(CR-1) will open and the machine will shut down.
The Power Switch must be turned OFF and back
ON to reset the welder. See Protective Devices
and Shutdown Circuits.
6. LED 5 indicates a DC control signal to the Firing
Board is present at lead 231 (J2-pin5). LED 5 will
vary in brilliance as the Control Potentiometer is
changed getting dimmer as output is increased
(opposite of LED 2)
NOTE: LED 5 will be very dim or OFF in CC (Stick)
Mode until a load is applied (arc struck).
7. LED 6 indicates a signal from the Firing Board that
a ‘trigger’ has been applied. LED 6 should be ON
whenever there is a closure of the 2 & 4 circuit. See
Firing Board information regarding LED 10.
TROUBLESHOOTING AND REPAIR
F-11 F-11
DC-600
Return to Section TOC Return to Section TOC Return to Section TOC Return to Section TOC
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC