Troubleshooting & repair, F-24, Procedure – Lincoln Electric PRECISION TIG 275 SVM162-B User Manual
Page 70
F-24
F-24
PRECISION TIG 275
TROUBLESHOOTING & REPAIR
HIGH FREQUENCY CIRCUIT DISABLE PROCEDURE (continued)
PROCEDURE
1. Remove the input power to the PRECISION
TIG 275 machine.
2. Using the 3/8” nut driver, remove the right
side case cover.
3. Locate the Spark Gap Assembly at the lower
rear right side of the machine. See Figure
F.2.
4. Carefully remove the three leads from the
Spark Gap Assembly. See Figure F.2.
5. Insulate the leads from each other and from
the case.
6. When voltage testing and scope measure-
ments are complete, reconnect the three
leads to the Spark Gap Assembly.
7. Reassemble the right side case cover.
FIGURE F.2 – SPARK GAP ASSEMBLY
RE
MO
RE
MO
TE
TE
LO
CA
L
LO
CA
L
MA
XIM
UM
MA
XIM
UM
DIS
PL
A
DIS
PL
AYY
MIN
IM
UM
MIN
IM
UM
MO
DE
MO
DE
A
AC
B
C
BA
LA
NC
E
AL
AN
CE
PO
ST
FLO
PO
ST
FLO
W
W
DC
ON
OF
F
PO
W
ER
AC
DC
+
PR
EC
ISIO
N T
IG
TM
375
TH
E L
INC
OL
N E
LE
CT
RIC
CO
MP
AN
Y C
LE
VE
LA
ND
, O
HIO
US
A
DO
NO
T S
W
ITC
H
W
HIL
E W
EL
DIN
G
SQ
UA
RE
W
AV
E P
OW
ER
SO
UR
CE
fea
turi
ng .
..
MIC
RO
S
TA
RT
TM
TE
CH
NO
LO
GY
~
WA
RN
ING
LIN
CO
LN
EL
EC
TR
IC
!
.015 Spark Gap
LEADS
ATTACH
HERE
VIEWED FROM ABOVE