asked Apr 30, 2006 at 4:49pm
Hp HP LaserJet 4100

LJ 4100 Fuser Testing

Does anybody have a diagram showing the test points for a LJ 4100 fuser? I have the HP service manual, but it doesn't show where they are; it just lists them.


With the connector at the bottom, you'll see 3 pairs of pins. The left set reads infinity. The center set reads 34 ohms and the right set reads 47 ohms.
by moe on Apr 30, 2006 at 5:47pm Add comment
I'm assuming that if the left set reads "open" instead of infinity that the thermo disk or temp sensor is faulty and that if the other 2 sets are reading ok that the heater is ok. Is this correct and if so where can I get a replacement sensor?
by jbyrum1965 on Sep 11, 2006 at 10:11am Add comment
Open is the same as infinity.

Shorted would be 0 ohms, the opposite of infinite resistance.
by Stephen on Sep 12, 2006 at 6:59pm Add comment