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TROUBLESHOOTING & REPAIR
F-52 F-52
SQUARE WAVE TIG 275
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POLARITY SWITCH REMOVAL AND REPLACEMENT (continued)
FIGURE F.16 – POLARITY SWITCH WIRING DIAGRAM
232A
211A
R8
232
211B
211
B 232
211 X5
23VAC
212
X6
B 231
B X4
231B
115VAC
232B
B X3
W X8
W 204
18VAC
R 210
B X9
W X7
W 201
18VAC
W X10
W 209
H1
H2 (208V)
H3 (230V)
H4 (460V)
S
F
S
F
78VAC
X1
X2
E
F
D
B
C
B
A
X1
POS
B
FRONT GANG
POLARITY SWITCH MICRO SWITCH
AC A-C, D-E, B-F OPEN
DC+ B-D, C-E, A-F, G-H CLOSED
DC- B-D, A-E, C-F, G-H CLOSED
REAR GANG
MICRO-SWITCH
312
275C
NO
NC
D2
S2A
H
G
NEG
S2
POLARITY
SWITCH
(REAR VIEW, SHOWN
IN AC POSITION)
POS
(-)
SCR3
SCR4
D1
R7
X2
NEG
G1
G2
218
G3
217
220
220A
(+)
G4
216
L1
115VAC
CB
CB232C
C7
W 221
R 222
R6
253
252
BYPASS /
STABILIZER
PC BOARD
WORKELECTRODE
247
S
SPARK
GAP
F
ARC STARTER AS'BLY
115VAC
C5
L3
T2
L4
T1
SCR2
SCR1
T3