LINK & BEARING AS 2512655 - Caterpillar

No power to the data radioProbable Causes
Display not turned on
Fuse blown or Circuit Breaker Open
Failed AccuGrade Radio
MPT or Power Jumper
Power Module
Damaged harness or connectorNote: The D8T and D9T do not use a power module. Power is supplied directly to the AccuGrade radio via a fuse.Problem Isolation
Test Step 1. VERIFY THE DISPLAY WILL POWER UP
Ensure the battery disconnect switch and the key start switch are in the ON position.
Turn on the display.Expected Result:The display turns ON.Results:
OK - The display turns ON. Proceed to Test Step 2.
NOT OK - The display does NOT turn "ON".Repair: Perform the "Display Does Not Turn On" procedure. Stop.Test Step 2. VERIFY THE ACCUGRADE RADIO POWERS UP.
Verify that the power LED on the AccuGrade radio is illuminated.Expected Result:The power LED on the AccuGrade radio is illuminated.Results:
OK -The power LED on the AccuGrade radio is illuminated.Repair: The problem was caused by the diplay being turned off. Return the machine to service.Stop.
NOT OK - The power LED on the GPS receiver(s) is not illuminated. Proceed to Test Step 3.Test Step 3. CHECK THE POWER TO THE GPS RECEIVERS.
Disconnect the harness connectors from the from AccuGrade radio connector.
Measure AccuGrade radio.Expected Result:The measured voltage is approximately machine voltage.Results:
OK - The measured voltage is approximately machine voltage. Repair: The AccuGrade radio has failed. Replace the failed AccuGrade radio.Stop.
NOT OK - The voltage is not approximately machine voltage. Proceed to Test Step 4.Test Step 4. CHECK FUSE OR CIRCUIT BREAKER.
Check the fuse or circuit breaker.Note: Use the machine schematic in order to identify the correct fuse or circuit breaker.Expected Result:The fuse or circuit breaker is "OK".Results:
OK - The fuse or circuit breaker is "OK". Proceed to Test Step 5.
NOT OK - The fuse or circuit breaker have failed.Repair: Replace the fuse or circuit breaker.Stop.Test Step 5. CHECK FOR AN OPEN POWER JUMPER OR A FAILED MPT IN THE POWER CIRCUIT IN THE HARNESS.
Use the AccuGrade Electrical Schematic for the machine in order to determine if a power jumper or an MPT is used.
Disconnect the power jumper or MPT.
Place a jumper between pin B and pin C at the connector of the display harness.
Turn on the displayExpected Result:The AccuGrade radio powers upResults:
OK - The power jumper or the MPT has failed.Repair: Replace the power jumper or the MPT.Stop.
NOT OK - The AccuGrade radio does not power up. The power jumper or the MPT are not the cause of the failure. Proceed to Test Step 6.Test Step 6. CHECK FOR A SHORTED POWER CIRCUIT IN THE HARNESS.
Check the display harness for a short circuit condition.Note: Use the machine schematic to