Eastwood MIG 175, Service Manual

Page: 13 / 20

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13
SYMPTOM POTENTIAL PROBLEM DIAGNOSTIC TEST SOLUTION
Power Switch in ON Position
- Power light on Control
Board OFF
- Fan not running
No or low A/C Voltage Source Check A/C Voltage at Wall Outlet Circuit breaker or wall circuit
Loose or open connections at
Power Switch
Visual and continuity test at
switch connection
Repair loose/open connection
Faulty Power Switch Verify power switch function Replace faulty power switch
Faulty Overload Switch
Reset Overload Switch, faulty if
trips again immediately
Replace faulty Overload Switch
Faulty Control Board
240V AC across pin 1 on CON 1
and pin 2 on CON 3
Replace Control Board
Power Switch in ON Position
- Power light on
- Fan not running
Open or Loose connection in Fan
Circuit
Visual/Continuity Check of Fan
Connections
Repair loose/open in Fan circuit
Faulty Fan
Check for 240V AC across pins
1 and 3 on CON 9 on Control
Board
If 240V AC, replace Fan
Faulty Control Board
0V AC across pin 1 and 3 on
CON 9
Replace Control Board
Unit Powers up
- Torch Trigger Pulled
- Gas Flowing
- No Wire Feed
- Drive Roller not Turning
Wire feed mode not selected
Check position of spool gun
transfer switch
Move switch to wire feed mode
Loose or Open Connection in
Gun Trigger Circuit
Visual and continuity check of
trigger wiring and connections
Repair loose/open connection
Faulty Gun Trigger
Measure resistance across
trigger terminals when trigger
pulled (should = 0 ohms)
Replace Torch if switch faulty
Faulty Control Board
With torch switch on, check
voltage across pins 1 and 2 on
CON 6
If no voltage, replace control
board.
Faulty Drive Motor
With torch switch on, check
voltage across pins 1 and 2
on CON 6
If voltage (24V DC), replace
Drive Motor
Unit Powers up
- Torch Trigger Pulled
- Gas Flowing
- Drive Roller Turning
- No or Erratic Wire Feed
Wire Feed set too low
Check wire feed setting on front
panel
Adjust wire speed if needed
Gun Cable damaged or bent Visual check of Cable Straighten or replace Cable
Contact Tip blocked Visual Check of Tip
Clear blockage or replace
Contact Tip
Incorrect Inlet Guide or Contact
Tip
Confirm correct consumables for
wire size
Replace with correct size
consumables if needed
Hub tension too high Check wire Hub tension Adjust tension as needed
Drive Roller pressure too low Check Drive Roller pressure
Adjust Drive Roller pressure as
needed
Incorrect Drive Roller
Confirm correct drive roller for
wire size
Replace with correct drive roller
if needed
TROUBLESHOOTING TABLE
See page 17 for test points and values.
See page 18 for parts location.