![]() ![]() I thought i'd try doubling ratings from 0.25A and seeing what happens. 0603 fuses seem to range from about 200mA to 6A. ![]() I will then put a fuse in series with current shunt resistor so I can measure the current and see what happens. It is a huge PITA to assemble/disassemble with no way of being able to test it disassembled. like the print head! My plan is to put a pair of leads on the fuse terminals then reassemble the printer. The service manual says for engineers to replace the main PCB, which would be pretty stupid if the cause of the fuse blowing was external, e.g. The fuse is really not designed to be replaced. Sure enough, there is an 0603 part on the main PCB labelled F1 which is open circuit - see pic. In the service manual the error code is listed with the only possible reason being a fault on the main board: "Circuit error (include blowout of a fuse), possible cause Main Board failure". It developed the fault while printing and has had regular but not heavy use. It shows an error code immediately on startup before activating any motors etc. The printer is an Epson printer WF-7610, pretty large and complex beast, A3 size with ADF & Scanner. I'm interested to know if anyone could guess what this fuse is protecting and/or has advice on how to approach replacing it and testing. I have a fault which I believe is at least due to an SMD fuse blowing. ![]()
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