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I agree could well be SD card but always check the RAM sticks are seated correctly,on the printer PWB,it takes no more than 5 minutes to check.

I have above,see attached.Black/broken lines in feed direction.First copy out ok after that get lines which slowly get darker.I have swapped black image units which are OM,transfer belt unit changed...

That's exactly it,you have all the icons but no reactions.

If its any help I have replaced the part shown but in all my 3 cases the screen had completely gone.The part cost around £65,Kyocera said to replace the whole control panel at several £100,

Firmware is available from www.tradenetsharp.co.uk
You can update it by USB stick via sim 49.
or via web browser which I find easiest.
Open web browser and enter...

Try 00000000 or 19660000 or 00001966

Good luck

Sim 80 is one of 6 or so secret sim codes,there is one in there as well to reset meter reading etc.From memory it is
program
*
0
clear
instead of
program
*
clear
*

yeah sorry my mistake we have mx2640,3140 and just saw 3640 tagged on the end

i have had the memory dimms fail on several Sharp devices and do you use www.tradenetsharp.co.uk,we don't have that model in the UK but do have Aries range.

Have you tried booting it up with the HDD disconneted?It is waiting for a signal from something before continuing its warm up

What state is the developer in?

You are cailbrating the developer,test command 25-02 i think from memory.also a new drum and number 1 corona unit always helps with copy quailty problems on these devices.

and reseat the network card as well

Have you tried reseating or replacing memory dimms?

The manual says this...
DescriptionThe Control Logic did not detect New Cartridge Detect Switch engagement to reset the Accumulative Dispense time NVM value to 0 when a new cartridge was installed....

Sharp SF 825,heap of mechincal rubbish!