HP Officejet Pro 8500 : Use scanner without print heads/cartridges

Hello.
I have a HP Officejet Pro 8500 (CB023A) that I bought specifically because of the automatic duplex scanner. Buying a scanner with automatic duplex instead of this multifunction printer was out of the question because the cheapest one costed over ten times more than this multifunction printer (and they still do).
I can no longer afford to keep buying print heads and cartridges just to use the scanner, as this multifunction uses ink for scanning!!! But that is beside the point.
I have read in other posts about taping sensors but I was thinking about going a little further and completely remove the printing part of the multifunction. Anyone knows if I can just disconnect the printing part from the circuit board? Or will I have to fiddle with software? Maybe some hidden option in the "Mfg Commands" (accessible by pressing * and # with the printer on) or some other hidden feature?
Considering that this multifunction takes way too long to boot because of all the print head checking/cleaning/etc, with a little luck, without the printing part the boot time will decrease to almost nothing .
Before I start disassembling I would appreciate some advice, specially if someone else has already tried it.
Thank you in advance.

Hello kamath27. Thank you for your reply.
I apologize for not replying sooner but I wanted to try and disassemble the multifunction before replying instead of just replying with an acknowledge.
Also, sorry for such a long post but I wanted to be as detailed as possible.
However, before describing what I did and found, I want to clarify something.
With the multifunction in the same condition it came from the factory, if I remove one print cartridge, or one is empty, the multifunction stops on boot with a message requesting to change the cartridge before continuing and there is no way to bypass it. When this message shows, pressing any button on the multifunction or the screen yields no result (there is no OK button displayed on the multifunction screen). It was always like this and firmware updates never solved it.
And going to the printer control panel on the connected computer says that the printer is offline even if it is connected through USB and is displayed in device manager as a connected USB device. This is the reason why I had spent so much money buying ink that I do not use. I never print anything on this multifunction. All prints that the multifunction ever performed were a dozen or so of maintenance align and test pages.
Now for what I did. I disassembled the multifunction just enough to take out the main circuit board, the wireless board, the buzzer and the door sensors. I set up the printer half and the scanner half side-by-side with the main circuit board in the middle, reconnected everything and turned it on in order to test if anything stopped working during disassembly. Everything was OK and the multifunction worked as normal (printed a test page and scanned it to the computer).
Next, while facing the main board the same way it would be faced while mounted in the multifunction, I started disconnecting the connectors (except the ones that belong to the scanner half) one by one from left to right in the following fashion: With the multifunction OFF, I disconnected one connector, turned the multifunction on, waited for any message or the main screen, tried to print a test page and then scan it, and finally disconnected the multifunction, reconnected the connector and moved on to the next one.
The results were:
- disconnected the tray feeding sensor -> Allows to boot with a paper jam message that can be bypassed with an OK on the screen. Can not print because of the alleged paper jam but can scan.
- disconnected the pump -> Allows to boot but a message keeps popping about pump motor stalled. Can be bypassed with an OK but pops right back and all jobs get aborted. Can not print or scan.
- disconnected the printer motor -> Oddly, no messages. Allows to boot and scan but not print. This was strange because when trying to print there is no message in the printer and the software on the PC only said the printer was busy. I would think the printer would eventually display a message saying the print carriage was jammed or something but nothing happened after 10 minutes. I might test again later as one test may be interfering with the next.
- disconnected the print cartridge door sensor -> Stops on boot with a message to close the door. Does not allow to print or scan.
- disconnected the print cartridges connector -> Stops on boot with message to replace cartridges. Does not allow to print or scan.
- disconnected the print heads connector -> On boot briefly displays a screen with the image of the power button and the code "C00E0060" below. Then the screen turns white and all buttons on the multifunction start blinking. It is as described here but resetting the multifunction, reconnecting the connector and turning it on took it back to operational condition.
- disconnected everything except for the scanner connectors and the tray and door sensors - Gives the exact same behaviour as the previous test (code "C00E0060").
So, from the tests it seems that I can not use the scanner if anything from the printer half is disconnected. Any ideas on how to circumvent this, if possible?
Thank you.

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Make it easier for other people to find solutions, by marking my answer with \'Accept as Solution\' if it solves your problem.
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Click the “Kudos Thumbs Up" at the bottom of this post to say “Thanks” for helping!
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
W a t e r b o y 71
I work on behalf of HP

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This question was solved.
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