HP LaserJet 4200-4300 Service Manual

Issue Description:

Some CLJ4700 customers may experience a 59.C0 error and a grinding noise during installation. When occurring out of box, a 59.C0 occurs as a result of the secondary alienation cams (on the Developer Alienation Cams) becoming caught on the sheet metal during shipment, causing a 59.C0 during installation. This document outlines how to resolve this issue.

Background

Normal Process Occurring at First Power-up

Secondary alienation cams are located on the Developer Alienation Cams. These secondary alienation cams are also called “SCIP” cams, where “SCIP” stands for “Ship Cartridges In Printer.” The sole purpose of these cams is to further alienate the cartridges during shipment. At first power-on out of box, a secondary alienation (SCIP) cam “roll over” process occurs in order to rotate the cams out of the way. This process occurs only once – during installation – and will not occur again once completed. The photo below shows how the Developer Alienation Cams should appear after successful “roll over” of the secondary alienation (SCIP) cams. Note that the Developer Alienation Cams are “phase” offset, where the top cam appears to be rotated to 6 o’clock position, Magenta cam rotated to 8 o’clock position, Cyan cam rotated to 10 o’clock position and Yellow cam rotated to 12 o’clock position. This is by design.

Developer Alienation Cams after successful

secondary alienation (SCIP) cam roll over

Solution:

59.C0 without grinding noise

Occasionally, some units may exhibit only a 59.C0 Error on the control panel display but not experience a grinding noise. The solution is to simply rotate the secondary alienation (SCIP) cams out of the way on the Developer Alienation Cams. (See photo below.)

Rotating secondary alienation (SCIP) cams out of the way

59.C0 with Grinding Noise

More often, the secondary alienation (SCIP) cams may catch on the back side of the sheet metal at the rear of the cartridge atrium. This prevents successful secondary alienation (SCIP) cam “roll over.” Because these cams are caught behind the back side of the sheet metal, the Developer Disengaging Motor will stall and make a pulsating grinding noise. See photo below for position of cams when this occurs.

Secondary alienation (SCIP) cams are

not visible after unsuccessful “roll over”

Repair Procedure

1. Power up and verify the 59.C0 error message and pulsing / grinding noise.

2. Open and remove the ETB and 4-cartridges.

3. Check the Developer Alienation cam position and verify that secondary alienation (SCIP) cams are not visible after unsuccessful “rollover.”

4. On the Color LaserJet 4700, remove the right side cover. On the Color LaserJet 4730mfp, remove the rear cover.

5. Manually rotate the Developer Drive Alienation Gear in the counterclockwise direction until the secondary alienation (SCIP) cams “pop” through the sheet metal hole.

6. Manually rotate the Developer Drive Alienation Gear in the clockwise direction for two full 360° rotations. Verify that the secondary alienation (SCIP) cams have been rotated out of the way on the Developer Alienation Cams, as pictured.

7. Install the ETB and print cartridges, then power up to verify that the 59.C0 error does not occur.

8. Print a “Diagnostics Page” to verify that all color planes are present.

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