Lincoln Electric RANGER 3PHASE SVM207-A Service Manual page 58

F-20
OUTPUT RECTIFIER BRIDGE TEST (continued)
TO POLARITY SWITCH (S2)
TEST PROCEDURE
1. Remove the spark plug wires to prevent accidental
engine kickback or starting.
2. WIth a 5/16" nut driver or socket, remove the 6
sheet metal screws from the case top.
3. Remove the rubber gasket (cover seal) from the lift
bail.
4. Remove the fuel cap. The rubber gasket for the fill
tube will come off with the case top.
5 Remove the case top, then replace the fuel cap.
6. Rremove the 5 screws holding the right case side.
7. Remove the right case side by lifting up and out.
8. Conduct the test with the gasoline engine OFF.
9. Locate the Output Rectifier Bridge behind the
machine case front.
10. Put the Polarity Switch in the AC Mode.
11. Unplug the 12 pin connector (J1) from the Control
Board.
TROUBLESHOOTING AND REPAIR
FIGURE F.5 – OUTPUT RECTIFIER
LEAD 8
(—)
(+)
TO CHOKE
(L1)
RANGER® 3 PHASE
TO STATOR (LEAD W1)
AC1
AC2
LEAD 254
12. Use an Ohmter (analog meter preferred) to test the
Output Rectifier per the following chart:
+ Meter Lead — Meter Lead
AC 1
+ AC 1
AC 2
+ AC 2
AC 1
— AC 1
AC 2
— AC 2
NOTE: Meter readings may vary depending on the
type of meter. Typically, all "LOW" readings and
all "HIGH" readings should be similar.
If any of the readings are not correct, disconnect the
leads at those terminals and re-test. If still not correct,
replace the Output Rectifier.
If the readings are now correct, check the leads that
were disconnected for shorts or grounds.
F-20
TO RANGE SWITCH (S1)
TO STATOR (LEAD S2)
Meter Reading
+ LOW < 100Ω
HIGH >1MΩ
+ LOW < 100Ω
HIGH >1MΩ
— HIGH >1MΩ
LOW < 100Ω
— HIGH >1MΩ
LOW < 100Ω