4069-XXX
| FRU | Action |
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9 | Engine Board | Turn the printer off and disconnect |
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| all the cables from the engine board. |
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| Check for +5 V dc at the engine |
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| board test point. If incorrect, replace |
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| the FRUs in the following order: |
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| engine board |
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| interconnect board |
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| If correct, turn the printer off and |
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| reconnect one cable at a time until |
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| you find the defective assembly. |
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| Service Tip: A short or low |
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| resistance load that is attached to |
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| the engine board can cause the |
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| LVPS to overcurrent and shut the |
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| +5 V dc supply down to 0 V dc. |
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| Service Tip: Check the engine board |
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| for burn marks or other damage, |
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| especially R20,R21, R22 and R23 |
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| located next to the upper left engine |
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| board mounting screw. If this screw |
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| is overtightened it might deform the |
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| engine board shield and cause it to |
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| short out these resistors. |
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