Fan speed too low due to wiring issue.

Check/reseat the wire connections on the fan interconnection board.

Fan speed too low due to fan damage.

Remove the Light Source from the projector and do the following:

1. Remove the fan from the Light Source assembly and check if this numbered fan is not blocked.

2. If not blocked, replace the fan.

For removing the Light Source, see service procedures in "Laser Phosphor Light Source". For removing and replacing the fan, see procedure "Replacing a fan from the Light Source".

Defective Cooler Control Board.

1. Replace the Light Source Fan Interconnection board. See procedure "Replacing the Light Source Fan Interconnection Board".

2. If problem persists, replace the entire Light Source. See procedure "Laser Phosphor Light Source".