I'm an idiot

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Things are progressing rather slowly as my 3rd year project takes up more time. I was on the brink of keeping the printer happy through a complete print when suddenly the transfer belt lift clutch, cleaning roller cam clutch and feed motor all stopped working! I looked at the paper feed PCB, to which they are all connected and saw a small axial component the size of a standard resistor but without colour bands with "FU101" on the silkscreen.

As I reached for the multimeter I thought how rarely it is that fuses actually blow, and given that this was a stupendously rare piece of electronics coated in irreplacable, datasheet-less  parts it was virtually certain that the fuse would be fine and some horribly exotic component would be at fault.

I put it down to working last thing at night, having run out of all coloured wire except red and black!

Miraculously, the fuse was blown. Even more miraculously, it had 3000 written on the side, which I can only assume means mA.

I'm lacking anything but 500mA fuses at the moment, and they're in massive glass tubes, not little axial packages. I'll have to wait for a farnell order.

Or with any luck I'll win this ;-) 

 

Submitted by jeff on Sat, 04/07/2007 - 15:47. categories [ ]

Other printers

Can't you rescue a fuse of the older printer?

'fraid not

'fraid not, I have two 2100s but only one 4550. They aren't even slightly similar. I haven't checked for fuses, but I'd be pretty surprised. I want another 4550 anyway - it's the cheapest way of buying consumables!

eBay

That is one seriously fortuitously located eBay auction.

divine intervention

nope, it's just a sign ;-)

PCB Printer

Any more progress?

Not much

I replaced the fuse, and the printer now works again. I've added a microcontroller to fool the correct sensors at the correct times during a print run so the printer can print continuously rather than printing one sheet, claiming a paper jam and requiring a reboot. A reboot of the 4550 takes an AGE. I started knocking together a simple state machine implementation on an MSP430 but haven't finished it yet.

The project has been put on hold, rather, as I've kinda got bored with it. I'm fickle like that! Also I've just moved house, and am yet to unpack properly. I've got piles of other projects on the go too - most notably a CNC machine for drilling PCBs. One axis is complete and moves, the other will hopefully start to move tonight. It will be blogged about soon.

I am still generally thinking about PCB development techniques (as my recent blog posts discuss) and have not given up on the direct toner approach just yet. Watch this space.

Thanks for your interest,
Jeff