Lincoln Electric IDEALARC DC-1500 Service Manual page 77

F-43
ACTIVE SCR TEST PROCEDURE (continued)
C A T H O D E B A R H E A T S I N K B O T T O M S C R A N O D E H E A T S I N K J U M P E R B O T T O M S C R & S N U B B E R C A T H O D E H E A T S I N K
C A T H O D E T O P S C R A N O D E T O P S C R G A T E L E A D S T O P S C R H E A T S I N K
TOP SCR
CATHODE
HEATSINK
CATHODE
JUMPER
BAR
BOTTOM SCR
ANODE
HEATSINK
3. Perform test procedure as follows. Refer to
Figure F.17. Repeat test for all six SCRs.
NOTE: DO NOT DISASSEMBLE THE HEAT
SINKS. THIS TYPE OF SCR NEEDS TO
BE COMPRESSED BETWEEN THE FAC-
TORY HEATSINK IN ORDER TO CON-
DUCT CURRENT.
TROUBLESHOOTING AND REPAIR
FIGURE F.17 – SCR/HEATSINK LOCATION(S)
IDEALARC® DC-1500
F-43
TOP SCR
ANODE
HEATSINK
TOP SCR
GATE LEADS
& SNUBBER
BOTTOM SCR
CATHODE
HEATSINK