I'm having the same exact problem, but with a "077-901" error code. AC button didn't work for me either. I'm going shopping for an HP tomorrow if I can't get this fixed in the next couple hours.
I found posts (more helpful and less helpful), contacted support, and scrutinized the User Manual. Based on other community posts by @llynster and @Dell- Praveen (apparently no longer listed) I want to find out where the various sensors are, and I want to find out how to manually actuate the rollers. A Service manual would be wonderful! Pictures of what parts I need to disassemble would be good.
I can get it to come up with the "Ready to Copy" message.
I can bring it up in Customer Mode and display Digital Input
JRKirk
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Posted January 19th, 2016 11:00
I'm having the same exact problem, but with a "077-901" error code. AC button didn't work for me either. I'm going shopping for an HP tomorrow if I can't get this fixed in the next couple hours.