Description: Coupling Sensor Error. Coupling sensor 1 and 2 have turned on simultaneously.
Remedy: C 991 Service - Engine error. Note: This error displays when a problem exists with the coupling on and off sensors. The same error displays for either sensor. 1 Coupling On/Off Sensors Engine Board SN Cable Engine Board Turn the printer on and observe how long it takes for the error to display. If the coupling On sensor is failing, the warm-up will be shorter than the coupling Off sensor. Check the sensors by manually positioning the coupling cam disk over the coupling on (upper) sensor while turning the printer on. If the disk moves out of coupling, and the error displays, there is a problem with the coupling On sensor. If you manually position the coupling cam disk over the coupling Off (lower) sensor, while turning the printer on and the disk moves out of the Off sensor and then moves back into the sensor, there is a problem with the Off sensor. Coupling On sensor Pin # Signal Voltage Voltage Voltage Cam Disk in Cam Disk Out 1 +5 V dc +5 V dc +5 V dc 2 CUPON +5 V dc 0 V dc 3 DGND 0 V dc 0 V dc Coupling Off sensor Pin # Signal Voltage Voltage Voltage Cam Disk in Cam Disk Out 1 +5 V dc +5 V dc +5 V dc 2 CUPOFF +5 V dc 0 V dc 3 DGND 0 V dc 0 V dc If a problem cannot be isolated with the sensors, check the SN cable. • If incorrect, replace the cable. • If correct, replace the engine board. 2 Coupling Cam Check the coupling cam and associated parts for correct operation. If a problem is found, repair or replace the motor mounting stay A assembly.
Code: 992
Description: High Voltage Leakage. The high voltage leakage detection circuit has detected leakage in the high voltage system. • This symptom may require replacement of one or more customer replaceable units, designated as supplies or maintenance items, which are the responsibility of the customer. With the customer’s permission, if available, try new print cartridges. • Before proceeding with this service check, turn the printer off, wait a few minutes and turn the printer back on. If the error remains, proceed with the remainder of this service check.
Remedy: 1 Print Cartridge Open the cartridge cover and remove the cartridge in the top position of the carriage assembly. Try a new cartridge and the printer again. Verify that a 992 error check continues to display, for the cartridge replaced. • If it is not the same cartridge, try a new cartridge for each time the 992 error code displays, until you find the failing cartridge. • If the new cartridge still fails, continue to the next step. 2 HVPS Grid Block 1 Grid Block 2 Remove the HVPS from the printer. Reinstall the HVPS verifying the HVPS board touches all the appropriate contacts on grid blocks 1 and 2, and is mounted securely. • If a 992 error displays, remove the HVPS and check the contacts on grid blocks 1 and 2 for any signs of pitting, bending, deformed contacts, or contamination. Repair or replace parts as necessary. • If the source of the problem cannot be isolated, replace the following FRU's in the following order given: 1. HVPS 2. Grid block 1 3. Grid block 2
Code: 993
Description: Cam Sensor does not turn on The cam sensor did not activate.
Remedy: Error Code 993: Indicates the cam sensor has not been activated. The sensor activates when the fuser drive motor turns the cam disk. If the fuser drive motor does not turn on, or the drive parts are not operating, go to A. If the fuser drive motor turns and appears to be operating properly, and the cam is turning, go to B. If the fuser drive motor turns and appears to be operating properly, and the cam is not turning, go to C. A The fuser drive system is not operating properly. 1 Fuser Assembly Fuser Drive Motor Fuser Motor/Paper Feed Motor Carriage Unit Motor Cable Engine Board Check the fuser assembly internal drive gears for binding, or broken or worn teeth. If a problem exists, repair or replace the fuser assembly. Remove the fuser drive motor from the stay assembly, leaving the motor cable connected to the motor. Turn the printer on, but do not allow the motor to touch other areas of the printer. Verify the motor turns during POR. If it does, the problem is most likely in the motor mounting stay assembly. Go to step 2. Check the motor for shorts between the case and each motor winding. If a short is found, replace the motor. Note: Damage to the engine board may result from a shorted motor. Check the motor for open windings. If found, replace the motor. Check continuity of the fuser motor/paper feed motor/carriage unit motor cable. • If incorrect, replace the cable. • If correct, replace the engine board. 2 Motor Mounting Stay Assembly (Fuser Drive Parts) Check the fuser drive gears, gears C3-1, C3- 2, the clutch spring, motor drive gear, gear C2 and C4 for signs of chipped gear teeth, worn parts, or improper operation. If problems are found, repair as necessary. Check the cam gears and solenoid for proper operation and signs of broken or worn gear teeth or damaged parts. If found, repair or replace the motor mounting stay assembly. B The fuser drive system is operating properly and the cam disk is turning. 1 Cam Sensor (PH16) Engine Board (M4) SN Cable Be sure the cam sensor is mounted correctly and locked into place. Check the following voltages on the cam sensor: Pin # Signal Voltage Voltage Voltage Disc in Disc Out 1 (Orange) +5 V dc +5 V dc +5 V dc 2 (Brown) -CCSENS +5 V dc 0 V dc 3 (Green) GND 0 V dc 0 V dc Note: The voltage on pin 2 should vary, as the cam turns from approximately 0 V to +5 V dc. • If the voltage on Pin 1 is incorrect, check the cable. If incorrect, replace the cable. • If the cable is good, replace the following FRU's in the order shown: 1. Cam sensor 2. Engine board 3. SN cable C The fuser drive system is operating properly and the cam disk is not turning. 1 Contact Cam Solenoid CRF Cable Engine Board Check the solenoid for proper operation, making sure it picks during POR cycle. Disconnect the solenoid and check the resistance on the solenoid cable. It should measure approximately 65 ohms. If incorrect, replace the solenoid. Check the voltages on the solenoid cable connector. Check the following voltages on the contact cam solenoid cable connector: Pin # Signal Voltage Voltage Voltage Static Picked 1 (Red) +24 V dc +24 V dc +24 V dc 2 (Black) -SL2ON +24 V dc 0 V - +24 V dc Note: All voltages are approximate. If the voltage on Pin 1 is incorrect, check continuity of the CRF cable to the cam solenoid. • If incorrect, replace the cable. • If correct, replace the engine board. 2 Motor Mounting Stay Assembly Check the clutch spring, clutch boss, clutch disk and gear C4 for signs of wear, broken teeth or binds. Repair or replace the motor mounting stay assembly if a problem is found.