Lexmark Optra C710 Service Manual - Page 143

5016-001 Printhead Service Check The printhead assembly does not contain any service replaceable parts or components. Do not remove any screws from the printhead cover assembly, as this might cause internal contamination or damage. 931 Error Code: This error may be caused by a failure with the HYSNC signal to the printhead or a malfunction within the printhead. Go to A. 932 and 933 Error Codes are not used. 934 and 935 Error Codes: Indicate a problem with the mirror motor circuit in the printhead assembly, the mirror motor cable from the engine board to the printhead, or the engine board. Error code 934 indicates a failure in the mirror motor locking function. Error code 935 indicates that the mirror motor turned, but did not stabilize. If you have either a 934 or 935 error code displayed, go to B. A 931 Error Code FRU 1 Interlock Switches S3, S4 (+5 V dc interlock) Action The +5 V dc interlock for the printhead prevents the printhead from powering on by the engine board if the cartridge door, fuser door or front cover are open. Check the voltage on the orange lead to interlock switch S4 at the switch. It should read approximately +5 V dc. • If incorrect, disconnect the switch and check the voltage on the cable connect and go to step 2. • If correct, check the voltage on the blue lead attached to interlock switch S3. It should read +5 V dc. • If correct, check the switches for continuity and correct operation. • If a problem is found, replace the failing switch. Diagnostic Information 2-77