Lexmark X644E Service Manual - Page 71

7002-xxx Service error codes (9xx.xx) (continued) Error code Sub codes Display text Description 937 .71 937 .80 Loss of lock detected by higher level code. Motor is type 1. Driver over temperature detection. Motor is type 0. • Defective motor cable • Defective main drive motor • Paper jams • Excessive gear loading in gearbox assembly 939 .00 RIP-engine communications lost. System board 940 .00 LVPS zero-crossing test failed. • Incorrect LVPS installed • Noisy AC power source • LVPS to system board cable loose 947 .00 948 .00 PQET RAM test incomplete, PQET RAM test did not complete, PQET RAM test failed MARCH0 PQET RAM test failed MARCH1 PQET RAM test busy failure Pel clock check failed PQET failed to pass RAM tests on the system board System board 949 .00 Delay line calibration failure System board 950 .00 NVRAM mismatch Action Go to "Main drive service check" on page 2-153. Go to "Main drive service check" on page 2-153. POR the printer several times, if the error code continues to be displayed, replace the system board. See "System board and inner shield removal -models X644e/X646e" on page 4-131. Check to make sure the correct LVPS assembly has been installed. If the correct supply is installed, check to make sure the LVPS to system board cable is installed correctly. If correct, replace the LVPS assembly. See "Low voltage power supply removal" on page 4-109. Replace the system board. See "System board and inner shield removal -models X644e/X646e" on page 4-131. Replace the system board. See "System board and inner shield removal -models X644e/X646e" on page 4-131. Replace the system board. See "System board and inner shield removal -models X644e/X646e" on page 4-131. Go to "950.00 through 950.29 EPROM mismatch failure" on page 2-120. or go to "950.30 through 950.60 EPROM mismatch failure" on page 2-121. Diagnostic information 2-33