HP LaserJet 4100 -- Fuser Continuity Test Points

The 4100 fuser has two heaters and two thermistors. Here's a view of the fuser's connector.

The two large pins at the right are one heater's terminals -- approx 46 ohms.

The next two large pins just to the left are the other heater's terminals -- approx. 34 ohms.

The two small pins at the lower right are one thermistor's terminals -- approx. 1.7 megohms.

The next two lower small pins just to the left are the other thermistor's terminals -- approx. 5 megohms.

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The upper row of small pins is for exit sensors. The two remaining small pins are n/c.

The large pin at the lower left is chassis ground.

The large pin at the upper left is for a 'brush' that contacts the fuser's sleeve.

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