You can also verify by doing the test the Brother Kurtius prescribed, reprinted here for your viewing pleasure:

1. Remove receiver board (right side) and insert wire into plug in black/black-white wire locations . This effectively bypasses the optics for test purposes. if you have no black/blk-white wires in the plug don’t panic, just chose the two wires beside the blank hole, not on the end.

2. test for voltage at the 4 wire harness plug, black to white and black to green…should have 120vac in both places. if not, inline fuse is open or wire is broken or separated in the liner. very bad and prolly not repairable (the broken wire not the fuse).

3. if voltage is present, hookup i/m and test at the points on the motor module head previously noted L and N…should have 120vac.

4. if voltage is present, install jumper between test points T and H…this should start the icemaker on a rotation if all the above outlined conditions are true. if it doesn’t, the motor on the module is bad. if it does start, reinstall i/m and wait till it fills and parks. remove jumpers and reinstall optics receiver. icemaker should work…if not, we have proven the icemaker assembly is good and the optics must be at fault, regardless of whether the light flashes are checking good or not.

If the board checks bad by this method, it's slam-dunk dead.

Emitter-Receiver Board

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Source: KITCHENAID