brother hl-2240 printer fix

I bought a brother laser printer for almost nothing and i was hoping to sell it. It had no power at all it would not turn on. First thing i figured was bad power supply or bad fuse.

the fuses all checked good and the power supply puts out the correct volts.

so i moved on and started checking other boards inside.

i took out the usb or Logic board and noticed when i flipped it over that the spot of the pcb under one of the chips was cooked a bit.

this particular chip doesnt have any legs on it i wouldnt even know where to begin soldering it.

So i took the board out of my own personal hl-2230 printer and put it in, put it back together and turned it on.

This non-working dead printer now works fine with that board but i need that board for my good printer.

I have not been able to find a replacement for over 2 months and it looks like this otherwise working printer will be either sitting around or going to the curb if i cant find one.


im really surprised that one hasnt shown up on ebay.

Smeh, we got a new wirless color printer / scanner with ink for 30$. Not worth it these days.

I guess ill just keep it as a parts printer although i cant see anything really going wrong with mine. i surge protect most everything electronic.

that printer was probably just plugged into the wall.

Depending on how a surge hit the fuse doesnt always blow and it will move to another part.

a long time ago i had a pioneer audio amp and lightning caused 2 large capacitors inside to self destruct. the fuse never opened.

i was there when the lightning struck.

You'd be surprised.  Sometimes pcbs fry due to just poor design and not lightning bolts.  The pcb for the ac adapter for my digital camera fried because of those stupid flip-prongs.  Apparently the connection wasn't very solid with them causing the pcb to overstress which made a big power trace bubble and break.  I repaired the huge broken trace, replaced the flipping prongs with a regular power cord, and it's worked fine for years this way.

I'm not certain if fuses are meant for surges or something shorting.

The one time I suffered a lightning bolt damage the electricity went straight through my 1974 pioneer amp without damaging everything and fried the sound card in my computer that the amp was plugged into.

Drakon wrote:

You'd be surprised.  Sometimes pcbs fry due to just poor design and not lightning bolts.  The pcb for the ac adapter for my digital camera fried because of those stupid flip-prongs.  Apparently the connection wasn't very solid with them causing the pcb to overstress which made a big power trace bubble and break.  I repaired the huge broken trace, replaced the flipping prongs with a regular power cord, and it's worked fine for years this way.

I'm not certain if fuses are meant for surges or something shorting.

The one time I suffered a lightning bolt damage the electricity went straight through my 1974 pioneer amp without damaging everything and fried the sound card in my computer that the amp was plugged into.

or mabeye it just jumps the fuse from the hot side of the fuse to other parts of the pcb and just never actually passes through the fuse since its so powerful.