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SECTION 4
4.1 TROUBLESHOOTING
Listed below are a number of trouble symptoms
each followed by the checks or action suggested to
determine the cause. Listing of checks and/or ac-
tions is in "most probable" order but is not neces-
sarily 100% exhaustive. Always follow this general
rule: Do not replace a printed circuit (PC) board until
you have made all the preceding checks. Always
put the Power switch in off position before remov-
ing or installing a PC board. Take great care not to
grasp or pull on components when removing a PC
board. Always place p. c. boards on a "static-free"
surface. If a printed circuit (PC) board is determined
to be the problem check with your ESAB supplier for
a trade-in on a new PC board. Supply the distributor
with the part number of the PC board as well as the
serial number of the wire feeder. Do not attempt to
repair the PC board or any other component your-
self. Warranty on a PC board or control will be null
and void if repaired by customer or an unauthorized
repair shop.
4.2 TROUBLESHOOTING GUIDE
A. General
1. Check interconnection between digimig control and
power source. Make sure that the contactor and
voltage control switches are placed in the Remote
position.
2. Energize the power source and the control.
3. Immediately after the control is turned "on", a number
will appear in the IPM and VOLTS readout window
and will only be displayed for 1-second. This number
identifies the current program (E-Prom) used in your
control. When a Program is changed, the new E-
Prom will automatically identify the new program
number being used. If a revision is made to an
existing program a number .1, .2, .3, etc. indicating
the numerical revision will also appear in the VOLTS
readout window simultaneously. Then, the Power
Source and Slope settings will flash for 3 seconds.
4. After the four (4) second delay; the preset "Weld"
parameters for the "Right-Side" Torch will be dis-
played in the IPM and VOLTS windows.
5. If the control is not functioning properly (or as de-
scribed above); for example, the numbers that ap-
pear in one or both of the display windows are
meaningless (all zeroes, eights, decimals, etc.), or
are completely incorrect in relation to your settings,—
the memory must be cleared. This condition might
occur after a bad lightning storm, extremely bad
power line surge, etc. To clear the memory, do the
following:
18
TROUBLESHOOTING
a. Place the Run-Set key switch in its SET position.
b. Turn "off" the unit's 115-volt Power switch.
c. Using one hand, hold both of the Inc/Dec toggle
switches in their INC position while reapplying
110-volt power with the other hand.
d. Almost immediately after the Power has been
turned "On", release the Inc/Dec toggle switches
to the neutral (spring-return center) position and
each of the windows should display one zero,
indicating a successful reset or clearing has taken
place.
6. You can now enter the desired information as de-
scribed in this booklet.
B. No preset displays appear in windows.
1. Make sure the LED Display board harness/plug is
plugged into the P5 receptacle on the MPU board.
2. Check that 110 vac is available across terminals T1-
18 and T1-19, if present;
3. Check for plus (+) 5 volts between terminals T1-8 and
T1-9; if voltage is present, replace the MPU board. If
voltage is not present, check the voltage regulator
(VR). The voltage regulator is located on the rear
panel of the control box.
4. Check the input and output voltage of the regulator
"VR".
a. The input should be approx. 11 volts between VR-
1 and T1-9. If voltage is not present, replace I/O
board.
b. The output should be + 5 volts between terminals
T1-8 and T1-9. If voltage is not present, replace
VR, voltage regulator.
C. Preset display is provided, but cannot be varied.
1. Check normal setup procedures described in Section
VI, then;
2. Make sure the Inc/Dec key harness plug is properly
connected to receptacle P6 on the MPU board and
the lock-in key switch is placed in its SET position.
3. If neither of the above resolve the problem, replace
the MPU board.
D. Motor does not run.
1. Check to make sure all required accessories are
correctly assembled as described in Section IV.
2. Make sure that power source is connected, plug P2
is securely connected to receptacle P2 on the
Digimig's I/0 Board, and then release the clapper arm
(pressure roll) on the Accessory Support Assembly.
a.Operate the Digimig INCH switch. If motor does
not run; replace the "J" governor board, and if it still
does not run, replace I/O and MPU boards respec-
tively.
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