Xerox 7700DX Service Manual - Page 168
Step 4: RegiCon #2 In/Out Skew Adjustment, When DC685-1 or DC685-2 Fails
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Step 4: RegiCon #2 In/Out Skew Adjustment This test makes "magnification" adjustments for registration. Magnification is the length of the scan line for the four colors, so that each scan line for each color is the same length. The data output can indicate PASSED, or READJUST (PASSED), or FAILED. If the result is READJUST, the indicated adjustment values for the skew adjustment should be done. It should not be necessary to rerun the test after making this adjustment. 1. From the Service Diagnostics menu, highlight Adjustments/Calibration menu and press OK. 2. Select Regi Con 685 Setup Cycle and press OK. 3. At the prompt: Which DC685 procedure?, select #2 In/Out Skew Setup, select YES and press OK. The front panel now displays: . 4. The printer now reboots and runs the test. Wait for approximately 10 seconds after the motors turn Off and the display indicates "Ready To Print," then cycle power and enter Service Diagnostics. 5. Enter Adjustments/Calibration --> Regi Con 685 Results and press OK. 6. Wait until the test results are displayed as follows: DC685-2 Passed A Out Blocks: 24 B Out Blocks: 0 Note If the block counts are not the same number as presented here, the printer has a print-quality problem. Please refer to section "Streaks in Direction of Paper Travel" on page 3-111 to resolve the print-quality problems before proceeding further with RegiCon. 7. If the display indicates , press OK to see the second panel data. If an adjustment is needed, adjust by the amounts displayed on the front panel. Be sure to tap the screw that was adjusted with a heavy screwdriver to ensure the adjustment remains true. Skew Corr. Y: -7 clicks CCW Skew Corr. M: 7 clicks CW Skew Corr. C: -5 clicks CCW Skew Corr. K: -12 clicks CCW When DC685-1 or DC685-2 Fails The horizontal alignment error is excessive and a manual adjustment is required before the diagnostics test routines for fine skew can pass. For details of the Coarse RegiCon Init procedure, see "Coarse RegiCon Initialization" on page 4-140. 4-138 Phaser 7700 Color Laser Printer Service Manual