• Code: 66.12.11
• Display: 66.12.11
• Description: Finisher error: swing motor (M36) and the swing-guide home-position sensor (PI35) Occurs when the swing guide does not leave its home position (swing-guide home-position sensor: PI35) after the swing motor (M36) is activated for 3 seconds. Also occurs when the swing guide does not return to its home position (swing-guide home-position sensor: PI35) after the swing motor (M36) is activated for 3 seconds.
• Remedy: Control-panel diagnostics: M36 (Swing Motor) and PI35 (Swing Guide Home Position Sensor) 1. Test the swing motor M36 by using the finisher component test from the controlpanel display. NOTE: When activated during the component test, the motor should rotate for about five seconds. While the motor is rotating, make sure that the swing guide is moving up or down at the exit area for stapling and stacking. • If the swing guide freely moves up and down, proceed to the next step (testing the swing-guide sensor PI35). • If the swing guide does not freely move up and down, remove the finisher rear cover and use your hand to turn the gear located to the right of motor M36 clockwise. • If the swing guide moves upward, the gears are properly working. Replace motor M36. If after replacing the motor the motor still does not turn on, replace the stacker controller PCA. • If the swing guide does not move, inspect the gears and replace damaged components as necessary. • If the sensor state does not change, perform the following steps: • Verify that the connector J707 on the stacker controller PCA is fully seated and not damaged. • Manually activate the sensor PI35 at the sensor body. If the control panel does not indicate a change of state, replace the sensor. • If raising the swing guide does not activate the sensor but it can be manually activated at the sensor body, replace the swing-guide assembly. • If the PI35 sensor state does change, check the drive gears for damage or obstructions. Replace components as necessary.

• Code: 66.12.12
• Display: 66.12.12
• Description: Finisher error - shutter movement malfunction Normal operation: When the shutter clutch (CL31) and stack-ejection lower-roller clutch (CL32) are on, the shutter moves up (closed) when the stack-ejection motor (M32) turns forward and moves down (open, delivery enabled) when the motor turns backwards. Error occurs when the shutter home-position sensor (PI45) indicates no change when the stack-ejection motor (M32) is activated for 3 seconds, indicating that the shutter is not moving.
• Remedy: Control-panel diagnostics: none 1. Inspect the shutter for damage. If the shutter cannot freely move, replace the shutter assembly. 2. Remove the lower guide (grate-shaped) and check sensor PI45 for damage. Make sure that the sensor is securely fastened to the chassis. 3. Check for proper alignment of the shutter mounted on the back of the grate-shaped lower guide and the lift mechanism on the finisher chassis. 4. Verify that connector J721 on the stacker controller PCA is fully seated and not damaged. 5. Check CL31 during operation, and verify that it is correctly functioning by activating prior to the error. Replace CL31 if necessary. 6. Only if the error persists and none of the previous steps correct the problem, replace the stacker controller PCA.

• Code: 66.12.13
• Display: 66.12.13
• Description: Finisher error - stack trailing-edge motor (M39) In order to improve stacking performance when ejecting copies, a trailing-edge assist guide is used in addition to the stack-ejection roller to support the rear end of the stack during stack ejection. Error occurs when the stacker trailing-edge guide does not leave its home position (PI39) after the stack trailing-edge motor (M39) has been turned on for 3 seconds.
• Remedy: Control-panel diagnostics: M39 process motor (stack trailing-edge assist motor) Test the swing motor M39 by using the finisher component test from the controlpanel display. • If the trailing-edge assist guide does not move, perform the following steps: • Verify that connector J722 on the stacker controller PCA is fully seated and not damaged• Also check the wiring at motor M39 and sensor PI39. • Replace the operation-tray assembly (processing tray). • Only if the error persists and none of the previous steps correct the problem, replace the stacker controller PCA. • If the trailing-edge assist guide does move, perform the following steps: • Carefully clean the sensor body by gently blowing clean air across the sensor to remove dust and debris. • Verify that the sensor flag is not damaged, moves freely, and is correctly aligned with the sensor body. • Verify that connector J722 on the stacker controller PCA is fully seated and not damaged. Also check the wiring at sensor PI39. • Replace the operation-tray assembly (processing tray). • Only if the error persists and none of the previous steps correct the problem, replace the stacker controller PCA.

• Code: 66.12.14
• Display: 66.12.14
• Description: Finisher stapling and offsetting front-aligningplate motor failure In order to neatly align the paper stack for either stapling or offsetting to take place, the front and rear aligning plates move to align each sheet when it enters the processing tray. The error occurs when the aligning plate either does not leave or when it does not return to the aligning-plate front-homeposition sensor (PI36) when the frontaligning- plate motor (M33) has been driven for 4 seconds.
• Remedy: Control-panel diagnostics: none 1. Verify that Offsetting is turned On in the Device Behavior menu. 2. Verify that connector J722 on the stacker controller PCA is fully seated and not damaged. Also check the wiring at sensor PI39 and motor M33. 3. Replace the operation-tray assembly (processing tray). 4. Only if the error persists and none of the previous steps correct the problem, replace the stacker controller PCA.

• Code: 66.12.15
• Display: 66.12.15
• Description: Finisher stapling or offsetting rear-aligningplate motor failure (M34) In order to neatly align the paper stack for either stapling or offsetting to take place, the front and rear aligning plates move to align each sheet when it enters the processing tray. The error occurs when the aligning plate either does not leave or when it does not return to the aligning-plate rear- home- position sensor (PI37) when the rearaligning- plate motor (M34) has been driven for 4 seconds.
• Remedy: Control-panel diagnostics: none 1. Verify that Offsetting is turned On in the Device Behavior menu. 2. Verify that connector J722 on the stacker controller PCA is fully seated and not damaged. Also check the wiring at sensor PI37 and motor M34. 3. Replace the operation-tray assembly (processing tray). 4. Only if the error persists and none of the previous steps correct the problem, replace the stacker controller PCA.

• Code: 66.12.16
• Display: 66.12.16
• Description: Finisher error - speed-change motor (M40) The speed-change motor M40 and sensor PI49 associated with this error have been removed from the output device prior to introduction to the field. This error message should never be seen in the field.
• Remedy: If error message appears, contact HP Support and report the error. HP Support: Report error to Technical Marketing.

• Code: 66.12.21
• Display: 66.12.21
• Description: Finisher upper-stapler motor failure (M41) Error occurs either when the stapler does not leave stapler home position (PI50) after staple motor (M41) is driven for 0.4 seconds or when it does not return to stapler home position after the staple motor has detected a motor-lock condition and the motor is driven backwards for 0.4 seconds, attempting to reach home position. NOTE: PI50 and M41 are located on the stapler assembly and can only be replaced by replacing entire stapler assembly. M41 (Staple Motor) drives the insertion and crimping of the staple only (not location of the staple on paper). PI50 senses the home position of the stapler as it is inserting and crimping a staple only (not location of the staple on the paper). The stapler-safety switch (MS34) that assures that stapler motor (M41) is disabled when it senses a finger may be in the stapler.
• Remedy: Control-panel diagnostics: none 1. Check the stapler unit for jammed staples. 2. Check the stapler unit for loose staples and paper dust. 3. Make sure that the stapler unit is fully seated. 4. Verify that connector J717 on the stacker controller PCA is fully seated and not damaged. Check the wiring at the stapler unit and the stapler PCA. 5. Replace the stapler.

• Code: 66.12.22
• Display: 66.12.22
• Description: Finisher upper stapler-shift motor failure (M35) Error occurs when the stapler does not leave the stapler-shift home-position sensor (PI40) after the stapler-shift motor (M35) has driven for 5 seconds. Also occurs when the stapler fails to return to the stapler-shift home-position sensor (PI40) after the stapler-shift motor (M35) has been driven for 20 seconds.
• Remedy: Control-panel diagnostics: M35-Staple Motor (Stapler-Shift Motor) and PI140-Stapler Home Sensor (Stapler Home Position Sensor) 1. Test the upper stapler-shift motor M35 by using the finisher component test from the control-panel display. • If the stapler unit moves properly, proceed to the next step in this section. • If the stapler unit does not move properly or moves erratically, perform the following steps: • Check the flat-flexible cable (FFC) for damage (dents, folds, and/or tears). Replace the FFC if necessary. • Check the FFC connectors and cable mounting areas. • If the error persists, replace the stapler assembly 2. Test the stapler-shift home-position sensor PI40 by using the finisher component test from the control-panel display. • If the sensor does not change state when the stapler unit is moved from the home position, perform the following steps: • Make sure that the sensor is securely fastened to the chassis. • Carefully clean the sensor body by gently blowing clean air across the sensor to remove dust and debris. • Verify that connector J1040 on the stacker controller PCA is fully seated and not damaged. Check the wiring at the sensor. • If the error persists, replace the stapler assembly. NOTE: The stapler assembly includes the stapler-shift home position sensor PI40, stapler unit, shift-position-plate assembly, and the flat-flexible cable (FFC).