Lincoln Electric RANGER 250 SVM150-A Service Manual page 84

F-34
ANALOG POWER PC BOARD VOLTAGE TEST (continued)
C1
CONTROL CIRCUIT
INPUT POWER
TEST PROCEDURE
1. Turn the engine off.
2. Perform the Case Cover Removal proce-
dure.
3. Locate plugs J41 and J42 from the Analog
Power PC board. See Figure F.14.
4. Start the engine and run it at high idle (3700
RPM) with no load.
5. Check for the correct Analog Power PC
board input voltage:
a. Set the volt/ohmmeter to the Volts DC
position.
b. Place the negative probe on J41 pin 2 and
the positive probe on J41 pin 1.
c. The reading should be between 75 and 85
VDC.
TROUBLESHOOTING & REPAIR
FIGURE F.14 – ANALOG POWER PC BOARD
RESISTOR R3
(0N BLOWER
SIDE OF
BAFFLER)
C2
13 1J41 to POS TERMINAL ON C2 - 85V SUPPLY
14 2J41 to NEG TERMINAL ON C2 - 85V SUPPLY
BLOWER BAFFLE - SIDE OPPOSITE BLOWER
RANGER 250
PCB2
ANALOG POWER
1
PC BOARD
J41
1
J42
If the reading is not correct, the stator output may
be incorrect, the rectifier output may be incorrect,
the capacitors may be faulty or the Power Module
PC board may be faulty.
Voltage Test, the Output Rectifier Bridge Test,
and the Power Module PC Board Test. The
capacitors C1 and C2 may be faulty. Test and
replace if necessary.
6. Check for the correct output voltage readings
per Table F.1. If any of the readings are not
correct, the Analog Power PC board may be
faulty.
PCB5
BY-PASS
PC BOARD
J60
1
3 1
J61
1
4 2
J62
J41
1
GND K
6 1
2
7
GND L 3
8
9 4
5
10
J42
Perform the Stator
F-34