4026-0XX
Service Checks
Charge Brush Service Check
Note: The charge brush charges the photoconductor and is located inside the photoconductor unit.
| FRU | Action |
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1 | Photoconduc- | Spots and marks can be caused by a defective |
| tor Unit | charge brush inside the photoconductor unit. |
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| If there are any spots or marks, especially ones |
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| that appear in the same spot on the printed |
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| page, replace the photoconductor unit. |
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| Check the photoconductor unit for a damaged |
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| charge brush contact. |
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2 | Main Drive | Be sure the main drive motor and gears are |
| Motor Gears | operating correctly and turning the charge |
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| brush. |
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3 | Charge Brush | Check the charge brush bias contact located on |
| Bias Contact | the right side frame for damage, corrosion, wear |
| (right side | or pitting. Intermittent failure of the charge brush |
| frame) | contact can cause an all black page, horizontal |
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| black bars or lines. If any of these are found, |
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| replace the charge brush bias contact. |
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4 | Photoconduc- | Check the photoconductor unit ground contact |
| tor Unit | on the right side frame for damage. Intermittent |
| Ground Con- | failure of the photoconductor unit ground contact |
| tact | can cause print quality problems such as an all |
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| black page, horizontal black bars or lines. If any |
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| of these are found, replace the photoconductor |
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| unit ground contact. |
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5 | HVPS board | Unplug the machine and check the HVPS for |
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| correct mounting, pitted or discolored contacts. |
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| If the HVPS is damaged, replace as necessary. |
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| If no problems are found replace the photocon- |
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| ductor unit assembly. |
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