4059-XXX
Hot Fuser Service Check
Error codes 923 and 924 may display for a hot fuser failure.
CAUTION: The fuser may be hot, use caution before removing or servicing.
| FRU | Action |
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1 | Fuser Cover Assembly | Check for damage to the thermistor |
| (Assembly includes | assembly. Check the resistance of |
| Thermistor and Thermal | the themistor: |
| Fuses.) | HOT - |
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| |
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| COLD =150K ohms to 260K ohms |
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| Check the continuity from each pin |
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| of J2 to ground. If there is continuity, |
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| replace the fuser cover assembly |
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2 | Engine Board | Error code 924 indicates the engine |
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| board detects an open circuit in the |
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| thermistor circuit for the fuser |
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| assembly. The voltage on |
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| the engine board measures |
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| approximately +5 V dc. If incorrect, |
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| replace the engine board. If correct, |
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| check the continuity of the DC fuser |
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| cable connected between J2 on the |
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| engine board and J1 on the fuser |
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| control board. In there is no |
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| continuity, replace the cable. If there |
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| is continuity, check the voltage on |
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| |
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| measures approximately +5 V dc. If |
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| incorrect, replace the fuser control |
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| board. |
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3 | Fuser Hot Roll | Examine the fuser assembly for |
| Backup Roll Bearings | signs of overheating or damage. |
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| Check the hot roll and backup roll for |
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| signs of excessive toner, label glue, |
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| labels or other contaminants. If any |
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| are found, repair as necessary or |
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| replace the fuser assembly. |
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