| FRU | Action |
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3 | Thermistor | If the fuser lamp comes on and a fuser failure |
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| LED error code displays, be sure the thermistor |
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| is contacting the hot roll and the thermistor |
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| cable is firmly seated in connector CN2 on the |
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| engine board. |
|
| Check for excessive toner buildup on the surface |
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| of the thermistor. Clean or replace as necessary. |
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| Turn the printer power off and disconnect the |
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| thermistor cable from CN2 on the engine board. |
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| Measure the resistance of the thermistor |
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| between |
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| should measure 250K ohms or less. If incorrect, |
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| replace the thermistor and cable assembly. If |
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| correct, replace the engine board. |
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| Note: The thermistor assembly is fragile. Use |
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| care when handling to avoid damage. |
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|
|
4 | Fuser Lamp | If the fuser lamp does not come on and a fuser |
| Cable | failure LED error code displays, unplug the |
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| printer power cord and check the continuity |
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| between the fuser cable contacts in the lower |
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| fuser cover. If incorrect, check the continuity of |
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| the fuser lamp, thermal fuse and terminals. |
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| Repair or replace as necessary. If correct, check |
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| the continuity of the fuser lamp cable. If incor- |
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| rect, replace the cable. If correct, replace the fol- |
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| lowing FRUs one at a time in the order shown: |
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| Engine Board |
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| LVPS |
|
| If the lamp does not come on and the Error LED |
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| is on solid, go to the “Fan Service Check” on |
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| page |
|
|
|
5 | Fuser Ther- | Check the fuser thermostat if the fuser lamp |
| mostat (4026- | does not come on or if it comes on and does not |
| 06C and 06F) | go off. Unplug the printer power cord and check |
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| the thermostat to be sure that it opens and |
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| closes properly. Replace as necessary. |
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Diagnostic Information
