Question about Office Equipment & Supplies
You don't mention the make or model of your printer/copier, but a quick Google would indicate that it is a Ricoh machine.
I give below a link to a site which lists many models of many makes of printer and error codes. their description and cause, which will help you identify what is wiring and correct it:
Error Codes Ricoh Aficio SP4100N Code 900
On this site you can change the make, model, and error code on your machine by using the drop down menus near the top of the page. Also you can download a pdf format Service Manual for the machine by using the link just above the error table.
Hope this is helpful, if so would you please register that with Fixya
Posted on Nov 30, 2014
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Posted on Jan 02, 2017
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[SC900] - replace fuse 8 0 4, DC power supply
[SC900] - replace black total counter
[SC900] - CN4 0 3 SCU PCB, poor connection
[SC900] - replace SCU PCB, see FSM page 5 64 for rom and dip switch info
Total counter error: Fuse #5 on PSU blown
Total counter error: Total counter defective
[SC900] - NV ram defective
[SC900] - re load copier firmware
[SC900] - replace counter harness
Electrical counter fail - Replace Mechanical Counter
Electronic counter error - Replace NVRAM-B098 9590.
[SC900] - replace IOB PCB
[SC900] - NVRAM defective
Electrical total counter error - NVRAM data defective
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