Lincoln Electric 11694 Service Manual page 45

®
POWER WAVE S350
DESCRIPTION
100 OHM PRE-CHARGE
RESISTOR
PRE-CHARGE RELAY COIL
RESISTANCE
"BUCK" CONVERTER IGBTs
"BUCK" CONVERTER DIODE
"BOOST" CONVERTER IGBTs
"BOOST" CONVERTER DIODE
FULL BRIDGE HIGH SIDE IGBTs
FULL BRIDGE LOW SIDE IGBTs
SWITCH BOARD TEST
Table F.7 – Switch board resistance measurements
METER TEST POINTS AND
POLARITY
B10 (+)
TO
B12 (-)
J41 PIN 5 (+)
RECEPTACLE ON SWITCH BOARD
TO
J41 PIN 6 (-)
RECEPTACLE ON SWITCH BOARD
B12 (+)
TO
B28 (-)
B28 (+)
TO
B49 (-)
B29 (+)
TO
B49 (-)
B48 (+)
TO
B29 (-)
B48 (+) TO B37 (-)
ALSO
B48 (+) TO B41 (-)
B37 (+) TO B49 (-)
ALSO
B41 (+) TO B49 (-)
(continued)
EXPECTED READINGS
100 OHM
15,000 TO 30,000 OHMS
DEPENDANT ON METER BEING
USED. TWO DIODES ARE IN THE
CIRCUIT PATH TO THE RELAY
COIL.
HIGH RESISTANCE. GREATER
THAN 100,000 OHMS. TYPICAL
FAILURE IS A "SHORT".
HIGH RESISTANCE. GREATER
THAN 100,000 OHMS. TYPICAL
FAILURE IS A "SHORT".
HIGH RESISTANCE. GREATER
THAN 10,000 OHMS. TYPICAL
FAILURE IS A "SHORT".
HIGH RESISTANCE. GREATER
THAN 10,000 OHMS. TYPICAL
FAILURE IS A "SHORT".
HIGH RESISTANCE. GREATER
THAN 10,000 OHMS. TYPICAL
FAILURE IS A "SHORT".
HIGH RESISTANCE. GREATER
THAN 10,000 OHMS. TYPICAL
FAILURE IS A "SHORT".
TROUBLESHOOTING AND REPAIR
CONDITIONS
MACHINE "OFF" NO INPUT
POWER APPLIED.
MACHINE "OFF" NO INPUT
POWER APPLIED. PLUG J41
REMOVED FROM THE SWITCH
BOARD.
MACHINE "OFF" NO INPUT
POWER APPLIED. THE INPUT
CHOKE DISCONNECTED FROM
THE SWITCH BOARD B28.
MACHINE "OFF" NO INPUT
POWER APPLIED. THE INPUT
CHOKE DISCONNECTED FROM
THE SWITCH BOARD B28.
MACHINE "OFF" NO INPUT
POWER APPLIED. THE INPUT
CHOKE DISCONNECTED FROM
THE SWITCH BOARD B28.
MACHINE "OFF" NO INPUT
POWER APPLIED. THE INPUT
CHOKE DISCONNECTED FROM
THE SWITCH BOARD B28.
MACHINE "OFF" NO INPUT
POWER APPLIED. THE PLANAR
TRANSFORMER ELECTRICALLY
ISOLATED FROM THE SWITCH
BOARD AT TEST POINTS B37
AND B41.
MACHINE "OFF" NO INPUT
POWER APPLIED. THE PLANAR
TRANSFORMER ELECTRICALLY
ISOLATED FROM THE SWITCH
BOARD AT TEST POINTS B37
AND B41.
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