Illustration 1 g01619517 Partial SchematicThis procedure should only be used if the display will not turn on. If the display powers up and proceeds to then turn off, there may be a problem with the following: Base station Avoidance zone settings within the design fileThe conditions that are listed below may cause the display to not power up: Disconnect Switch or Key Start Switch in OFF position Fuse Circuit Breaker Wiring Failed DisplayTest Step 1. CHECK THAT THE DISCONNECT SWITCH AND THE KEY START SWITCH ARE IN THE ON POSITION Ensure that the disconnect switch for the battery and the key start switch are in the ON position. Turn on the display.Expected Result:The display turns on.Results: YES - The display turns on.Repair: The disconnect switch or the key start switch was in the OFF position. Return the machine to service.STOP NO - The display does not turn on. Proceed to Test Step 2.Test Step 2. CHECK THE FUSE Disconnect the 10 amp "AccuGrade" fuse (Fuse 9) from the fuse panel. Check the resistance across the two contacts of the fuse. Expected Result:The resistance measurement is less than 1.0 ohm.Results: YES - The resistance measurement is less than 1.0 ohm. The fuse is not open. Proceed to Test Step 3. NO - The resistance measurement is greater than 1.0 ohms. The fuse is open.Repair: Replace the fuse. Return the machine to operation.STOPTest Step 3. CHECK THE CIRCUIT BREAKERAn open "Main Breaker" circuit will disrupt power to the display. Place the key start switch and the disconnect switch in the OFF position. Check for an open at the 80 amp "Main Breaker" circuit breaker.Expected Result:The 80 amp "Main Breaker" circuit breaker is open.Results: YES - The circuit breaker is open.Repair: Reset the open circuit breaker. Resume the operation of the machine.STOP NO - The 80 amp "Main Breaker" circuit breaker is not open. Proceed to Test Step 4.Test Step 4. CHECK THE POWER SUPPLY CIRCUIT AT THE DISPLAY Place the key start switch in the OFF position. Disconnect the harness connector for the display. At the harness connector for the display "CE-C4", insert multimeter probes along contact "D" wire (110-RD) and along ground contact "F" wire (200-BK). Measure the DC voltage.Expected Result:The voltage measurement is between 18 VDC and 32 VDC.Results: YES - Each voltage measurement is between 18 VDC and 32 VDC. The voltage supply is correct. The display has failed.Repair: Replace the display. Resume the operation of the machine.STOP NO - The voltage measurement is less than 18 VDC. There is an open or a bad connection in the machine harness.Repair: The machine harness is faulty. There is an open, a short to ground or a bad connection in the machine harness for either the power supply circuit wire (110-RD) or a ground wire (200-BLK). Proceed to Test Step 5 in order to isolate the problem.Test Step 5. CHECK THE POWER SUPPLY CIRCUIT FOR AN OPEN Turn the disconnect switch and the key start switch to the OFF position. Remove the "AccuGrade" fuse from the fuse block. The "AccuGrade" fuse is number "9". Disconnect the harness connector from the display. With the "AccuGrade" fuse removed from the fuse
