Pfc Control Board Resistance Checks; Pfc Control Board Diode Checks - Lincoln Electric POWER WAVE S500 Service Manual

F-20
PFC CONTROL BOARD TEST (continued)
TABLE F.3 – PFC CONTROL BOARD RESISTANCE CHECKS
DESCRIPTION
INPUT POWER CIRCUIT
INPUT LINE SENSING
DESCRIPTION
MAIN BUCK DRIVE "A"
AUX. BUCK DRIVE "A"
MAIN BOOST DRIVE "A"
MAIN BOOST DRIVE "A"
AUX. BOOST DRIVE "A"
AUX. BOOST DRIVE "A"
FULL BRIDGE "A"
FULL BRIDGE "A"
FULL BRIDGE "A"
FULL BRIDGE "A"
MAIN BUCK DRIVE "B"
AUX. BUCK DRIVE "B"
MAIN BOOST DRIVE "B"
MAIN BOOST DRIVE "B"
AUX. BOOST DRIVE "B"
AUX. BOOST DRIVE "B"
FULL BRIDGE "B"
FULL BRIDGE "B"
FULL BRIDGE "B"
FULL BRIDGE "B"
NOTE: *An open or short indicates a faulty PFC Control Board.
TROUBLESHOOTING AND REPAIR
METER TEST POINTS
AND POLARITY
PLUG J26 PIN 4 (+)
TO
PLUG J26 PIN 6 (–)
PLUG J25 PIN 1 (+)
TO
PLUG J26 PIN 6 (–)
TABLE F.4 – PFC CONTROL BOARD DIODE CHECKS
POSITIVE METER LEAD NEGATIVE METER LEAD
PLUG J23A PIN 8
PLUG J23A PIN 6
PLUG J23A PIN 12
PLUG J23A PIN 4
PLUG J23A PIN 11
PLUG J23A PIN 3
PLUG J24 PIN 7
PLUG J23A PIN 3
PLUG J24 PIN 3
PLUG J23A PIN 3
PLUG J23B PIN 1
PLUG J23B PIN 3
PLUG J23B PIN 13
PLUG J23B PIN 5
PLUG J23B PIN 14
PLUG J23B PIN 6
PLUG J24 PIN 6
PLUG J23B PIN 6
PLUG J24 PIN 2
PLUG J23B PIN 6
POWER WAVE
EXPECTED READINGS
VERY HIGH RESIS-
TANCE. GREATER THAN
20,000 OHMS
VERY HIGH RESIS-
TANCE. GREATER THAN
500,000 OHMS
PLUG J23A PIN 16
PLUG J23A PIN 14
PLUG J25 PIN 12
PLUG J23A PIN 12
PLUG J25 PIN 12
PLUG J23A PIN 11
PLUG J25 PIN 12
PLUG J24 PIN 7
PLUG J25 PIN 12
PLUG J24 PIN 3
PLUG J23B PIN 9
PLUG J23B PIN 11
PLUG J25 PIN 12
PLUG J23B PIN 13
PLUG J25 PIN 12
PLUG J23B PIN 14
PLUG J25 PIN 12
PLUG J24 PIN 16
PLUG J25 PIN 12
PLUG J24 PIN 2
® S500
F-20
CONDITIONS
INPUT POWER
REMOVED. PLUG J26
REMOVED FROM PFC
BOARD
IF LOWER REPLACE
THE PFC BOARD
EXPECTED READINGS
+/– 10%*
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC
0.130VDC