Good day everyone, this is my first post and first of all let me tell you i'm working with printers sharp, the most common thing of the error code F2-40 is from failure from the HV PWB board(RDENU0058QSPZ), because the technicians change this board and the printer works normally, i've already searched over the internet for a posible solution but i doesn't find anything, i just found this Sharp MX-M264N, MX-M264NR, MX-M264NV, MX-M264U, MX-M314N, MX-M314NR, MX-M314NV, MX-M314U, MX-M354N, MX-M354NR, MX-M354U (SERV.MAN52) Technical Bulletin — View online or Download repair manual | Updated HV PWB (Light prints copies). related on the board, i know that the problem of light copies, dark copies(almost the entire page black), waste of developer and the error code F2-40 is from the board, i hope anyone can help me fix the problem, by the way the other HV board of a MX-3115 have the problem with code C4-00 is from the transistor Q110 C2028(the real code is KTC2028) or Q109, or maybe both, changing it for a TIP122(putting an insulator) and changing the fuse IP101(N50) for a fuse type resistor of 2 A solve the problem and make the board run again, but in this board no component is damaged, i think the component damaged is the OPAMP LM224(IC351 and IC12) but i'm not sure.
I leave the datasheets from the components of the 3115 printer
I leave the datasheets from the components of the 3115 printer