Printronix L1024, Maintenance Manual

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13–40 Chapter 13 – Troubleshooting Guide
d. Replace the Engine Controller Board.
e. See the “General LSU Troubleshooting” section that follows.
29 LSU FAIL—Call Service
1. The LSU phase lock circuit is not sending its “Ready” signal to the Engine Controller Board.
a. Check the wiring to the LSU. Repair any wiring problems found.
b. Replace the L.V.P.S.
c. Replace the LSU.
d. Replace the Engine Controller Board.
e. See the “General LSU Troubleshooting” section that follows.
30 LSU FAIL—Call Service
1. LSU phase lock has been lost. The LSU either has failed to acquire phase lock, or has dropped
out of phase lock.
a. Check the wiring to the LSU. Repair any wiring problems found.
b. Replace the L.V.P.S.
c. Replace the LSU.
d. Replace the Engine Controller Board.
e. See the “General LSU Troubleshooting” section that follows.
31 LSU FAIL—Call Service
1. The LSU phase lock circuit is sending its “Ready” signal to the Engine Controller Board, but
should not be sending it, since the Engine Controller Board has not enabled the LSU motor.
a. Check the wiring to the LSU. Repair any wiring problems found.
b. Replace the L.V.P.S.
c. Replace the LSU.
d. Replace the Engine Controller Board.
e. See the “General LSU Troubleshooting” section that follows.
General LSU Troubleshooting
1. This is an error that has been detected in the LSU. Many things can cause this error. A
beam detect problem, a polygon motor problem, or abnormal power to the laser can all
cause this error.
a. The LSU cable is faulty and must be replaced.
b. The L.V.P.S. is not supplying the correct voltages to the LSU. The L.V.P.S. must be
replaced.
c. One of the above errors has occurred in the LSU and the entire LSU must be replaced.
d. The Engine Controller Board is faulty and must be replaced.