Xerox phaser 7750 service manual pdf

Is the voltage 0 VDC? Remove the Imaging Unit Plate cover. Replace the wiring Replace the ATC 2. Inspect the wiring harness between harness. Is the wiring harness defective? If this error is intermittant, replace the black developer clutch. Replace the toner Go to step 2. Is the wiring harness or the sensor wiring harness. Remove the rear cover and rear shield. Go to step 5. Replace the 2.

Measure the voltage at PA3 on the engine control engine control board. Measure the voltage at PA4 on the Go to step 6. Replace the engine control board. Measure the voltage at PA2 on the Go to step 7. Remove the imaging unit plate cover. Enter service diagnostics and run the Go to step 2. Does the motor operate correctly? Clean the 2nd BTR retract sensor. Go to step 3. Does the error still occur?

Use service diagnostics transmissive Go to step 4. Replace the sensor test. Does the sensor operate correctly? Check the transfer roller transmission Replace the left Go to step 6.

Are the gears damaged? Remove the left-hand rear mid cover. Replace the left- Go to step 6. Inspect the left-hand cover assembly hand cover wiring harness for damage and ensure assembly. Is the wiring harness damaged? Replace the Replace the 2. Reconnect power and enter service engine control transfer roller diagnostics. Do the 1st BTRs contact and retract? Run the 1st BTR retract sensor test.

Go to the Replace the 2. Does the status change between H transmissive accumulator belt and L? Caution If the accumulator belt is damaged, determine the cause of the damage before installing a new assembly. Remove the restraints been completely removed? Enter service diagnostics and run the Go to step 3.

Go to step 6. Clear Tech Rep Fault see pg. Does the accumulator belt rotate during the test? Remove the accumulator belt Go to step 4. Replace the assembly. Is the belt home marker present? This is a 7 mm, square, silver patch on the rear edge, inside the belt.

Rotate the belt if you cannot see the marker. On the accumulater belt assembly, Replace in the Go to step 5. Reinstall the belt assembly. Replace the accumulator belt Troubleshoot and Complete. Reflective Sensor 3. Does error 30 return? Procedure on pg. Partially remove the accumulator belt Go to step Go to step 7. Manually rotate the drive gear clockwise. Does the belt turn freely? Inspect the a. Go to step 8. Are the belt cleaner and auger clean and free of toner? Do the gears rotate freely?

Is the actuating lever broken off of the belt cleaner toner gate? Remove the waste toner cartridge. Verify the waste Go to step Enter service diagnostics and run the toner cartridge is Agitator Motor test.

Check the voltage at JA16 on the Go to step Go to step Check the voltage at J on the Replace the Go to step Check the voltage at JA17 on the Replace the Replace the harness. Remove the accumulator belt Diagnose and Since the assembly.

Does the motor turn? This failure can be caused by 1 of 3 components. Caution If the Accumulator Belt is damaged, determine the cause of the damage before installing a new assembly. Remove the accumulator belt Replace the Go to step 2.

Inspect the connector for damage. Is the connector damaged? Is the mating connector inside the Repair or replace Go to step 4.

Reinstall the accumulator belt Go to step 5. Run the Belt assembly. Edge Learn and 2. Enter service diagnostics and run the recheck. If it still Belt Edge Sensor test.

Is the result OK? Switch printer power ON. Remove the rear cover and shield. Measure the voltage between the Go to step 7. Replace in the engine control interface board and following order: JA-9 and frame ground. Measure the voltage between the Replace in the The edge sensor engine control interface board and following order: is defective, JA and frame ground.

Remove the accumulator belt Replace the Go to step 9. Enter service diagnostics and run the assembly. Steering Motor test. If the problem is 3. Measure the voltage between the Go to step Replace in the engine control interface board J following order: and frame ground.

Measure the voltage between the Replace in the Replace the engine control interface board J following order: steering drive Pins 1, 2, 3, 4 and frame ground. Inspect the DTS connector for assembly. Is the mating connector inside the Repair or replace Go to step 3. Reinstall the accumulator belt Use the Replace in the assembly. Is the value H when the belt home board marker is NOT under the belt home sensor? Turn OFF power and remove the fuser Go to step 2.

Replace the fuser assembly and allow it to cool down. Measure the resistance between the Fuser connector P and P Does the resistance measure between 30 K and K Ohms? Reinstall the fuser assembly. Go to step 4. Enter service diagnostics. From the Sensor Tests run the Fuser Temperature test. Is the temperature indicated approximately o C? Turn OFF printer power. Repair or replace 2. Measure the resistance between the wiring J 2 and J on the Engine harness.

Control Board. Turn printer power back ON. Check the AC Replace the 2. If the check is OK, replace the AC drive assembly. This is a cold condition. Replace the fuser Assembly. Measure the resistance between the fuser connector P and P Replace the Go to step 3.

From the Sensor Tests run the Fuser board. Temperature test. Replace the Repair or replace 2. Check for an open circuit or poor engine control the wiring connection between J to J board. Is the wiring OK? Replace the fuser Assembly and allow it to cool down. Measure the resistance between fuser Go to step 3. Replace the fuser connector P and P Does the resistance measure 20 Ohms or less? Turn OFF the printer power.

Check for an open circuit or poor engine control the wiring connection between J and board. AC Drive Board? Is the wiring harness OK? Replace the Drive Board. Turn OFF power, remove the fuser Go to step 2. Measure the resistance between the wiring J and J on the engine harness. The machine logic detected an open circuit in the rear thermistor.

Turn printer power OFF. Is line voltage present at FS47 on the Go to step 6. AC drive board? Replace the AC drive board. Enter service diagnostics and run the Go to step 4. Go to step 2. Does the fuser fan rotate at a high speed? Check for voltage at J Check the wiring 2. Check the wiring ON? If the problem continues, replace the engine control board. The fans are Go to step 8. Go to step 9. Enter service diagnostics and run the Go to step 7.

Imaging Unit Motor test. While running the Imaging Unit Motor engine control test, check the voltage at J and board. Is the voltage 0 VDC while the test is running? Check for a short to ground at J Repair or replace Replace the 2. Is the wire grounded? While running the Imaging Unit Motor imaging unit drive engine control test, check the voltage at J Replace the imaging unit reporting the Go to step 2.

Does the error still appear? Remove the imaging unit from the Replace the Troubleshoot the problem location and inspect the imaging unit plate wiring. If wiring is connector. OK, replace the 2. Use wirenet 8. Is the voltage at J 0 VDC troubleshoot. Remove the waste cartridge sensor Go to step 5. Measure the voltage between the yellow wire on the waste cartridge full sensor and frame ground, alternately interrupting the sensor.

Measure the voltage between the gray Go to step 4. Inspect the wiring Replace the 2. Measure the voltage at JB on harness for engine control the engine control board. Measure the voltage between the Replace the waste Inspect the wiring violet wire and frame ground. Does the voltage measure 0 VDC? Replace the Inspect the wiring 2. Measure the voltage at JB on engine control harness for the engine control board. Alternately interrupt the sensor necessary. Cycle power to the printer to clear the Complete Replace the error.

Did this clear the error? Cycle power to the printer to clear the Replace in the following order: error. Turn the printer off. Inspect the orange ribbon cable between the relay board and the engine control board. Is the connector fully seated and free from damage? Cycle power to the printer to clear the Complete. Replace the error. Replace in the error. Examine the trays and paper feed assemblies for any physical damage before starting the troubleshooting procedure. Pull out and then reseat Tray 2.

Does the lift motor operate? Did the Error Code 87 clear from the Complete. This Replace the front panel? Using Service Diagnostics test the Replace in order Go to step 5. Does the level indicate H? While still in diagnostics, pull out tray 2. Replace in order Go to step 6 2. Reseat the paper tray. Replace the paper Replace in order 2. Does SW indicate H in any feed motor. Pull out and then reseat the problem Go to step 8.

Listen for the motor, does the lift motor operate? Using service diagnostics check the Replace in order Go to step Replace in order Go to step Does SW 3,4,5, indicate H in any feed motor. An open circuit has been detected in the Paper Size Senor. Replace the Tray Go to step 4. Use the wirenets VDC? Do all checks indicate continuity? Enter service diagnostics and run the Replace the Go to step 2 Reflective Sensor test. Does the sensor change state from L to H when blocked?

Measure Pin 2 to ground. Check the wire between Pin 2 and Replace the Repair or replace engine control board Pin 8 for an open board. Replace the control board Pin 4 and Pin 5? Check the wiring to Pin 4 and sensor Replace the Replace the Pin 1 and Pin 5 to sensor Pin 3 for an engine control wiring harness.

Enter service diagnostics and run the Replace the Go to step 2. Transmissive Sensor test. Remove the sensor connector. Does the sensor now change state?

Check for a short between sensor Pin Replace the wiring Go to step 4. Is there a short? Check the wiring between sensor Pin 2 Replace the Repair or replace and engine control board Pin 8 for an affected board. Or, the staple move sensor did not turn on after the move to the staple position has completed. Error Code The staple move sensor does not turn OFF within 5 seconds after the move to the staple position has started. Or, the staple move sensor turned OFF after the staple position has been fixed.

Or, the staple move sensor does not turn OFF within 5 seconds after it has turned ON when the paper passed through the 1st position of the dual staple, moving to the rear staple position. Manually move the staple head. Diagnose and 2. Does the head move smoothly from repair the front to rear?

Use the Stapler Move Sensor test. Transmissive 2. Does the value change from L to H Sensor procedure when the sensor is blocked? Rear test in diagnostics. Does the stapler move motor run? Run the Stapler Home sensor test. Does the value change from H to L when the stapler is moved away from the home position? Measure the voltage between finisher Replace the Go to step 3. Measure the voltage at the Finisher The home sensor Go to step 4. Board connector P Replace the staple unit assembly.

Disconnect the Stapler Unit Assembly. Replace the Go to step 5. Measure the voltage between the stapler unit finisher board connector P and assembly. Enter service diagnostics and run the Replace the Go to step 7. Does the stapler motor operate board. Front Tamper Low Rear test in diagnostics. Does the front tamper guide operate? Check the Go to step 3. Check pins J A pins 1,3,4 and 6.

Check the following wires for and open Repair or replace Replace in order circuit or short circuit to ground. Is any the wiring until resolved: wire open or shorted?

Check the tamper front home sensor in Replace the Repair the sensor diagnostics. Does the value change from H to L board.

Transmissive when the tamper is moved away from Sensor the home position? Rear Tamper Low Rear test in diagnostics.

Does the rear tamper guide operate? Check pins JA pins 1,3,4 and 6. Is any wire open or shorted? JA-3 to JB-3 board 5. JA-4 to JB-4 6. JA-6 to JB Check the tamper rear home sensor in Replace the Repair the sensor diagnostics. Or, the Stack Height Sensor did not detect the tray moving up within 5 seconds after the Stacker Tray had been signaled to lift.

Actuate the stacker height sensor in Go to step 2. Troubleshoot diagnostics. Does the value change between H and L? Does the stacker tray lower? Diagnose and Go to step 4. Check the stacker motor gear, stacker tray, and belt track gear.

Does the stacker tray move up? Diagnose and Go to step 7. Actuate the stacker upper limit sensor in Go to step 2. Check the stacker motor gear, stacker tray and belt track gear. Does the head move smoothly from front repair the to rear? Use the diagnostics. Does the value change from L to H? Sensor procedure to diagnose and repair the sensor.

Defeat the front door interlock switch Replace the Go to step 4. Use the Bracket from the Finisher while leaving transmissive the connector plugged in.

Sensor procedure 2. Check the Set Clamp home sensor in to diagnose and diagnostics. Does the value change from H to L while blocking and unblocking the sensor? Reinstall the sensor in the Finisher.

And turn the printer on. Is the eject clamp up? Does the Eject Motor Run? Rotate the actuator while running the Go to step 2. Troubleshoot Decurler Cam Position test in diagnostics. If no problem is found replace the clutch. Replace the Go to step 4. Check the Set Clamp home sensor in Go to step 2. Does the value change from H to L Sensor procedure while rotating the actuator? Does the set clamp paddle turn once? Replace the Replace the set finisher control clamp solenoid. Finisher Staple Mode Logic Failure, Code There are no diagnostic routines for problems involving serial communications.

For troubleshooting problems associated with an error code or front panel error message, see "Error Messages and Codes" on page Troubleshooting procedures isolate a problem to a specific component or subassembly, in some cases including the wiring harness. Service Diagnostics The Phaser Color Laser Printer has built-in diagnostics that allow access to sensors, turning on and off motors, clutches, solenoids, built-in test patterns, cleaning maintenance operations, printer status and some NVRAM access.

Using these tests, the service technician should be able to diagnose problems quickly and isolate which component or sub assembly part needs replacement.

Service diagnostics are to be executed through the front panel by a certified service technician only. Service Diagnostics can be entered one of two ways:. Entering Service Diagnostics by Reboooting the Printer: 1.

Turn the printer power OFF. Hold down the Back and Information buttons simultaneously and turn the printer back ON. Continue to hold the buttons until the following message is displayed on the front panel: Service Diagnostics V. The front panel displays the Service Diagnostics Menu. Entering hidden service menu without rebooting the printer 1. Hold down the Up and Down buttons simultaneously. BACK Returns to the prior higher level menu structure, if available. If help text is displayed on the front panel, pressing BACK restores the current menu item and remove the help text.

Cancels current INFO display. INFO Provides help information, if available. Pressing INFO again restores the current menu item and removes the help text. UP Scrolls up one menu item within a menu list.

Used to increment data in tests requiring user input. DOWN Scrolls down one menu item within a menu list. The end of a menu list is designated by three asterisks. Used to decrement data in tests requiring user input. OK Enters the highlighted menu. Executes the current test item. Used to select a data value entered by the user. General Status Provides current print engine status. Front Panel Adjust Adjust Contrast?

The maximum fault count is and rolls to 1 on overflow. All count values are 0 at power on. Built-In Test Prints Prints pre-defined images stored in the engine firmware for troubleshooting image-quality problems. Yes Press Info to shift column. Change Duplex setting? Yes No. Set a new offset? Set New Media Type? Change Output Setting? This option is only available with an Yes optional finisher installed.

Finishing All four primaries are present on Laser Done the page. The print should appear grey. HalfTones Done. Scan Done. Sensor Tests The technician should test the functionality of each sensor by blocking the sensor and watching its state change on the front panel. Cancel Delete. Delete from my manuals? Sign In OR. Don't have an account? Sign up! Restore password.

Upload manual. Upload from disk. Upload from URL. It is only to be used along with the service manual not as a replacement for it as it applies to the appliance type, not the specific model and will go into more details on repairing the appliance.

Service Manuals generally provide information and instructions pertaining to product disassembly, schematic diagrams, parts lists, exploded views, troubleshooting guides, wiring diagrams, and much, much more.

Not all appliances and electronics have Tech Sheets or Fast Track publications.