Owner`s manual

OM-172 324 Page 69
12-5. Interface Board PC5 Diagnostic LED’s
1 Diagnostic LED’s Cover
Remove cover.
2 Interface Board PC5
Diagnostic LED’s are visible inside
unit, located on edge of Interface
Board PC5 facing front of unit.
Refer to Section 12-6 for information
on diagnostic LED’s.
Reinstall cover after checking diag-
nostic LED’s.
LED1
LED2
LED9
LED8
LED4
LED7
LED6
LED3
LED5
ST-800 755-B / ST-801 094
2
1
12-6. Diagnostic LED’s On Interface Board PC5
LED Status Diagnosis
1 On Indicates +15 volts dc present on interface board PC5 with respect to power source common.
Off If LED 1 is off and LED’s 2 thru 5 are on, replace interface board PC5. If LED 1 is off and LED’s 2 thru 5
are off, check Power switch S1, integrated rectifier SR1, and motor board PC3. Replace S1, SR1, and
PC1 if necessary.
2 On Indicates –15 volts dc present on interface board PC5 with respect to power source common.
Off If LED 2 is off and LED’s 1, 3, 4, and 5 are on, replace interface board PC5. If LED 2 is off and LED’s 1,
3, 4, and 5 are off, check Power switch S1, integrated rectifier SR1, and motor board PC3. Replace S1,
SR1, and PC1 if necessary.
3 On Indicates +15 volts dc present on interface board PC5 with respect to dc circuit common.
Off If LED 3 is off and LED’s 1, 2, 4, and 5 are on, replace interface board PC5. If LED 3 is off and LED’s 1,
2, 4, and 5 are off, check Power switch S1, integrated rectifier SR1, and motor board PC3. Replace S1,
SR1, and PC1 if necessary.
4 On Indicates –15 volts dc present on interface board PC5 with respect to dc circuit common.
Off If LED 4 is off and LED’s 1, 2, 3, and 5 are on, replace interface board PC5. If LED 4 is off and LED’s 1,
2, 3, and 5 are off, check Power switch S1, integrated rectifier SR1, and motor board PC3. Replace S1,
SR1, and PC1 if necessary.
5 On Indicates +5 volts dc present on interface board PC5 with respect to dc circuit common.
Off If LED 5 is off and LED’s 1 thru 4 are on, replace interface board PC5. If LED 5 is off and LED’s 1 thru 4
are off, check Power switch S1, integrated rectifier SR1, and motor board PC3. Replace S1, SR1, and
PC1 if necessary.
6 On Indicates contactor is not energized, normal standby mode.
Off Indicates contactor is energized.
7 On Indicates CV mode is selected.
Off Indicates CC mode is selected.
8 On Indicates gas valve GS1 is not energized, normal standby mode.
Off Indicates gas valve GS1 is energized.
9 On Indicates wire feed motor M1 is not running, normal standby mode.
Off Indicates wire feed motor M1 is running.