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WARNING
ELECTRIC SHOCK can kill.
Proceed with caution. Be careful not to touch any inter- nal machine components during the remainder
of the test procedure.
9.Check for +15 VDC between plug J50 - pin 3+ and J50 - pin
10.Carefully move the probes, placing the negative probe
11.If the voltage readings are NOT correct, check the associated wiring to the control board. If the wiring is okay, the control board may be faulty. Replace the control board. Refer to the Printed Circuit Board
Removal and Replacement Procedure in this section of the manual.
12.If the supply voltage readings are correct, load the machine to 400 amps.
CAUTION
Do not run the machine under load for more than 15 sec. with case removed.
13.Use a current probe to check for 5 ma of current through lead #218 (plug J50 - pin 4). This also reads approximately 1 VDC if you use a voltmeter.
14.If the current reading is NOT correct, the shunt amplifier board may be faulty. Replace the shunt amplifier assembly and perform current calibration.
15.If the current reading IS correct, the con- trol board may be faulty. Replace the con- trol board. Refer to the Printed Circuit Board Removal and Replacement proce- dure in this section of the manual.
16.After the test is completed and the prob- lem successfully repaired, install the machine case sides and top.
17.Install the handle and the lift bail rubber gasket.
