LPS communication cable disconnected from the CTLB-IN port of the first LPS unit in the LPS rack.

Check if the LPS communication cable (reference 4 of image "Data connection LPS side") is connected with the CTLB-IN port of the first LPS unit in the LPS rack of the projector.

Disconnected blue LPS cascade wire unit (CTLB-IN / CTLB-OUT).

Reconnect the blue wire unit (reference 5 image "Data connection LPS side") between the “CTLB-IN” and “CTLB-OUT” sockets of the LPS units.

LPS communication cable disconnected form the Signal Backplane.

Check if the LPS communication cable (reference 7) of image "LPS data connection Signal backplane") is connected with the Signal Backplane.

Malfunction of one of the LPS modules. The red LED “ERR” of the malfunction LPS module lit up.

Replace the malfunction LPS unit. See chapter "Lamp power supply".