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The problem is simple. The Shiny Silver bar that your Print Cartridges glide back and forth on is the PROBLEM!!!
When the motor that moves the cartridges left and right HAVE TOO MUCH RESISTANCE, YOU GET THE HARDWARE ERROR: 502.
How I fixed it is simple. Take some kleenex, and with power unplugged, clean the bar very well. Then Spray some WD-40 on a Kleenex, and lubricate the shaft!!
After I did this, I could use my DelL A960 as if it were BRAND NEW!!!
Hope this helps some one out there, as I had to figure it out myself!!
Hi there maximum time we found it is a the head problem. The print head is what the cartridges sit in inside of the printer. For resolve the problem please follow these.
Open the printer and wait for the carriage to slide over. Some how if its not come then Unplug the printer & Manually slide the carriage. Now Remove the ink cartridges from the print head & Use wet warm cotton swab or use alcohol to thoroughly clean the print head. Repeat this until there is no ink residue coming off on the cotton swab. After finished it make the head dry then fix it back. Now Try to print something now
If that does not work then follow the next step.
Remove the printer data cable & restart the PC & printer. Then fit back the data cable & turn on the printer. Hope that's start working , if no luck then Uninstall the printer driver & restart the PC & Printer both again. Now install the driver of the printer and connect it with PC ,Turn on printer & go for a test print from the printer preference. Thanks & waiting for your reply.
Make sure the contacts where the cartridge goes in are clean. A cloth dampened with water should be all right. You might also try installing a different cartridge. If that doesn't solve your problem, then your printer has an internal problem.
Shut down the printer, check whether the printer has peripheral devices such as a stabilizing power supply, and disconnect them.After five minutes, restart the printer to see whether the fault corrects itself. If the fault persists, the heating component may be faulty and the printer will need to be repaired.
The "clear tape" that you are playing with is called the "encoder strip." A barcode is etched on it that tells the printer carriage where it is. If you clean this carefully (google encoder strip for best methods) you may be able to get rid of 502 error for a while.
I just sprayed windex on bottom of cartridge several times and wiped with paper towel until dark streak of black appeared. Then I dried off cartridge and replaced. It works now. Must have been clogged.
Turn the printer upside down and see if anything falls out. Look inside as well. Maybe something is askew in there. Go the the manufacturer's website to their Support section. Email them or do a live chat. I just typed "hardware eror 502" and found a lot of answers. You might even type the manufacturer's name with just "hardware error".