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OWNERS
MANUAL
IGBT/MOSFET
Tester 156 114
4~
WARNING
ELECTRIC
SHOCK
cm
kill;
SIGNIFICANT DC VOLTAGE exists after
removal of
input
power.
Do
not
touch live electrical
parts.
Turn OFF
welding
power
source,
disconnect
input
power, wait 60
seconds,
measure
voltage
on
input
capacitors according
to
Service
Manual,
and wait
for
voltage
to
drop
to
zero
before
touching
any
parts.
Have
only qualified
persons familiar
with and
following
standard
safety
practices
perform
troubleshooting procedures.
July
1992
FORM: OM-156 165
Use above FORM number when
ordering
extra
manuals.
FiLE COPY
____
RETHRH
Tfl
mi
~ER
9I~
p--
~
i~
and
parts
on
circuit boards.
STATIC ELECTRICITY
can
damag
Put
on
grounded
wrist
strap
BEFORE
boards
or
parts.
Use proper
static-proof
bags.
.Ll
e
parts
handling
Before
use,
install 9V
battery.
To check
battery,
connect
RED and BLACK leads
together;,
test
light (LED)
=
ON;
battery
OK.
MOSFET
Testing
Procedure
#2
8
7
I
.5
Circuit
Diagram
Symbol
1
MOSFET Power Transistor
Check
plastic
case
for cracks in
side of
case or a
separation
of
case
from its base
plate. Replace
any
damaged
part.
Mark and disconnect all leads from
power transistor.
2
Source
2
(S2)
3
Gate
2
(G2)
4
Drain
2,
Source
1
(D2, Si)
5
Source
2
(S2)
6
Drain 1
(Dl)
7
Source
1
(Si)
8
Gate
1
(Gi)
9
IGBT/MOSFET
Tester
10 Test Button
11
Test
Light (LED)
Hook up
tester.
ON
=
Shorted:
replace
part
Press
button.
OFF
=
Fails
test;
replace
part
ON
=
Passes test
S.o717/S~66
a
Static Hazarci.
Put
on
grounded
wrist
Strap.
A
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