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CAVITY NUMBERING SEQUENCE
(COMPONENT SIDE OF P.C. BOARD)
1
1
4
1
5
1
3
J1
J4
J6
J8
J9
J7
J12
5
8
4
6
6
10
2
1
6
1
7
1
8
J3
J2
J5
7
12
8
9
16
14
J10
10
1
L2
L1
H5
H2
H4
H3
H1
L1
L2
5
H1
H1
H1
H1
H4
H4
H4
H4
2
4
3
1
RECONNECT
PANEL
LINE
(SHOWN CONNECTED
SWITCH
FOR 230V)
S1
W
TO SINGLE PHASE
SUPPLY LINE
B
G
TO GROUND PER
NATIONAL ELECTRICAL
CODE
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The specific diagram for a particular code is pasted
inside the machine on one of the enclosure panels. If the diagram is illegible, write to the Service Department for a replacement. Give the equipment code number.
POWER MI
MIG 255C
NOTES:
GENERAL INFOR MATION
N.A. WELDING CABLE MUST BE OF PROPER CAPACI TY FOR THE
ELECTRICAL S YMBOLS PER E15 37
CURRENT AND DU TY CYCLE OF IMMEDIATE AND
FUTURE APPLICA TIONS.
COLOR CODE:
N.B. THIS DIAGRA M SHOWS THE "ELEC TRODE" POLARIT Y
B - BLACK
"POSITIVE". TO CHANGE POLARI TY, TURN THE UNIT
W - WHITE
OFF AND REVERSE LEAD CONNECTIONS A T CABLE
R - RED
CONDUCTOR S TRAP AND WORK STUD.
U - BLUE
INDICATES CONNECTOR CAVI TY NO.
**
CAVITY
NUMBERING SEQUENCE
(NON-LEAD SIDE OF CONNECTOR)
1
2
J11
3 4
GUN
TRIGGER
1
324
2
325
3
4
354
209R
209R
208R
208R
D2
BAFFLE
SECONDARY
MOUNTED
VOLTAGES
RECTIFIER
X8
X8
DIODE
SHOWN
BRIDGE
ARE NO LOAD
116.6V
RMS VALUES
X9
X9
X5
X5
14.2V
X6
X6
208R
14.2V
208
X7
X7
H1
X1
G1
SCR 1
28.4V
H2
204
SCR
HEATSINK
H5
X2
ASSEMBLY
H3
X3
SCR 2
28.4V
H4
X4
G2
G2
G2
G2
G2
G2
H1
209
209R
POWER
TRANSFORMER
D1
206S
205
206B
C1
C3
C2
+
+
+
C1 THRU C3
204B
31,000 M FD
50V
POWER FACTOR
ENHANCEMENT
CHOKE
255C (2
(230/460/575 V)
J10
DISPLAY
BOARD
1
254A
R4
R3
256
253
254
251
252
WIRE FEED
ARC
SPEED
VOLTAGE
**
J11
1
2
325
3
J12
4
324
1
2
R
3
515B
U
4
555
B
206B
5
6
B
B
7
W
8
W
W
B
WIRE
R
T
DRIVE
A
U
MOTOR/
C
B
GEARBOX
H
206
207
207
15 OHMS
100 W
OUTPUT
CHOKE
F-2
CONTROL BOARD
352
352
253
252
251
FAN
MOTOR
552
551
256
353
353
550
254
500
515
J7
390
392
265
1
263
2
262
3
267
4
GAS
264
5
SOLENOID
260
6
7
261
8
9
10
FOR TIMER
OPTION
206B
B
W
515B
555
325
324
76
390
E
4
SPOOL GUN/
D
F
2
392
G
PUSH-PULL
75
C
A
3218
AMPHENOL
B
3214
(VIEWED
FROM REAR)
77
77
76
75
3218
3214
4
GAS
SOLENOID
2
311
311
312
312
320
320B
325B
SCR HEATSINK
OUTPUT CHOKE
ASSEMBLY
THERMOSTAT
THERMOSTAT
209
208
TO
TO
TO
WORK
WORK
WORK
206
206S
205
352
X9
354
325B
GND
320
207
353
X8
G2
204
G1
X7
X6
X5
GND
1
2
3
4
5
6
7
J2
8
9
10
11
12
13
14
1
2
3
4
5
J4
6
7
8
9
10
1
2
3
4
J1
5
6
7
8
1
2
J8
3
4
1
2
3
4
5
6
J3
J3
7
8
9
10
11
12
1
2
3
4
5
6
7
8
J5
9
10
11
12
13
14
15
16
1
2
3
J6
4
5
6
A.01
L12506
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