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I also have a 6500 and my printer wont recognize my ink cartridges. I purchased new HP ink yesterday and the same error still appears. I was on the phone with an HP technician for a while troubleshooting this problem. After we had tried every solution possible, the technician's supervisor came on the phone and told me that HP was sending me an electronic gift card to my e-mail address. It was for $165 to purchase a new printer from their online store. HP said that they didn't want my older printer back, so not to worry about what I decide to do with it. I ordered a new printer immediately. Sounds to me like there's an ongoing problem with that printer.
From looking at the manual it looks as if you have a faulty thermistor. When warming up, it has to heat up to at least 60 degrees. If it stays lower then 60 degrees celsius for over 35 seconds and doesn't reach 60 within that time frame then that would cause the open heat error that is happening on your machine.
It means you need to replace the photoconductor kit (the bit the toner fits into)
To reset this error, open the front door then press the cancel button for 3 seconds - all lights will cycle, close the front cover. The counter is now reset
If you have purchased the cartridges directly from dell , it will be covered under warranty for 2 years for hardware errors and you can call dell on 1800 624 9896 and get the cartridge replaced , even after the replacement of the cartridges if you have the similar issue then its an issue with the printer and needs to be replaced.
To test fuser out of circuit make sure lamp and thermal fuse are not open circuit, and thermister is neither open or shorted
Fuser repair procedure from tec manual.
Fuser Failure (U4-1, U4-2, & U4-3)
1 Switch off printer main power. Remove the Fuser Full Cover so you can observe the Heat Rods. Switch on printer main power and observe the ends of the Fuser Assembly. The Heat Rods glow.?
| Go to step 5.
2 Replace the Printer Engine Controller PWB (REP 4.10.6). The error message reappears.
| Problem solved.
3 Replace the Fuser Assembly The error message reappears.
| Problem solved.
4 Check for a broken wire or a loose connection
5 Measure the AC voltage between J23-2 and J23-6 on the AC Driver PWB. There is 110VAC (or 220VAC if the printer is the 220VAC model) between J23-2 and J23-6.
| Go to step 7.
6 Replace the Fuser Assembly (REP 4.7.1). If the problem persists, replace the Printer Engine
Controller PWB (REP 4.10.6).
7 The Fuser cycles up and down.
| Replace the Printer Engine Controller PWB 8 Measure the voltage between P401-1 and P 401-4 when the Fuser Fan cycles up and down. There is 24VDC between P401-1 and P401-4 when the fan is rotating and 0VDC when the fan is off.?
| Replace the Printer Engine Controller PWB 9 Replace the AC Driver PWB
Please rate solution to your question "How can I check that new Fuser unit is ok?"
Fuser issues - if problem is reoccuring then you are looking at more expense, are all vents free of obstructions (folders leaning on machine sides/rear) is machine being flogged, is power supply consistent, maybe even fuser bought was faulty, many options, try doing a warranty claim on fuser or replace again, even better get another printer, welcome to our throw away world!