Troubleshooting

Network Board Service

Commonly Used Abbreviations:

FEC - Front-End Control – the Dryer/Tumbler Control, Top-Load Washer Control, Front-Load Washer Control, and Washer/Extractor Control are all referred to simply as the Front-End Control throughout this document

NWB – Network Board

NIB – Network Interface Board

LED – Light Emitting Diode

Network Board LED

When the operation of the Network Board is suspect, the state of the LED may be examined to determine whether the Network Board is operating properly.

Network Board Operating LED Test

LED is Flashing One Second On / One Second Off -

This is what the LED should be doing in normal operation. If the LED is following this sequence, the processor on the board is executing the code correctly. However, there may still be other problems with the board.

LED is Constantly Off - If the LED is constantly off, there is probably no power to the NWB. There must be 24VAC across pins 6 & 7 on header H1 for the NWB to operate. If there is 24VAC across pins 6 & 7 and the LED is a constant off, the NWB will need to be replaced.

LED is Flashing Rapidly or is Constantly On - If the LED is constantly on or is flashing rapidly or erratically, the NWB may be in a lock-up state or may be bad. Remove power from the board by pulling header H1, and then put the header back again. If the LED begins to flash one second on / one second off, the board is probably OK. If this does not happen, the NWB will need to be replaced.

LED Flashes Rapidly 3 Times - This sequence indicates the beginning or end of a communication sequence with the FEC. The service personnel may determine if the NWB is communicating with the FEC by following the procedure in the following section.

Network Board Communicating LED Test

Test of Communications Between FEC and NWB Using LED - Power down the NWB by disconnecting header H1. Re-connect H1. Approximately 15 seconds after H1 is reconnected

(7 LED flashes), the LED should flash rapidly 3 times, indicating that it is beginning communication with the FEC. Two LED flashes later, the LED should flash rapidly 3 times again, indicating the end of a successful communication sequence. If this does not occur, the NWB is not communicating with the FEC.

Once it has been determined that the processor on the NWB is correctly executing the NWB code, the service personnel may now check for the following other possible malfunctions of the NWB (and/or the FEC).

•NWB is not communicating with the FEC

•NWB is not allowing the Card Reader to communicate with the FEC

•NWB is not communicating with the PC

Network Board to Front-End Control Communication Problems

NWB will not Communicate with FEC - If the NWB is not communicating with the FEC, the NWB, FEC, or Harness may be at fault. For the following cases, use the Network Board Communicating LED test previously described to test the communication link between the FEC and the NWB using the LED.

The FEC must supply 5 VDC to the NWB via pins 1 & 2 on H1 for the NWB to function correctly. If the 5VDC is not present, the NWB can in no way communicate with the FEC. If this voltage is not present, the harness or the FEC may be at fault.

If there is 5VDC across pins 1 & 2 of H1 and the NWB will not communicate with the FEC, swap the harness between the FEC and NWB with an known good harness. If this fixes the problem, the harness is at fault.

If the harness is not at fault, the NWB should be swapped with a known good board. If this fixes the problem, the NWB needs to be replaced. If after changing out the NWB and the harness with known good samples the NWB will not communicate with the FEC, the FEC must be at fault.

In general, there are three possible sources of failure, the NWB, the FEC, and the Harness. Parts may need to be swapped out individually to isolate the problem.

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