Lexmark MX61 Series Service Manual page 453

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* To determine what type of LSU (galvo or polygon) the printer supports and whether it is compatible with the

controller board:

Check the serial number of the printer. If the sixth digit character assigned is in the P–Z range, then the LSU

is polygon (example: 4514 2ZHH 007CR). If the sixth digit character assigned is in the 0–9 or B–N range,

then the LSU is galvo (example: 4514 20HH 007CR7.

Check the color of the controller board. For polygon LSU, the color of the compatible controller board is

blue. For galvo LSU, the color is green.

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