Greddy profec B spec II circuit diagram / PCB pics

[kamineko]

GAH sorry for suggesting it was a capacitor. I now believe its a 2.5A fuse

actually i can't back this up. but it looks identical to a smd fuse used on a playstation mobo

[Guest loren]

 kamineko said:

GAH sorry for suggesting it was a capacitor. I now believe its a 2.5A fuse

actually i can't back this up. but it looks identical to a smd fuse used on a playstation mobo

hah... a blown fuse ;D

I like that outcome 8)

And possibly resettable as well? edit: actually don't think so... just seen a link about these being the most commonly replaced part on a motherboard.

Thanks for the help everyone

[Guest loren]

Why do you say 2.5A? how do you decode the number, or is it exactly the same as the playstation fuse?

Do you know where to buy them from?

[kamineko]

i had a look online and havn't find any means to decode them yet. i'm only going on an identical looking device on a PS2 motherboard.

the resetable ones are usually flat, and it would have already reset when it cooled down

infact i wouldnt mind desoldering one and posting it, i have a bunch of old ps2 mobos

[kamineko]

http://www.koaspeer.com/circuit_protection.asp?part=2

this is the closest information i can find. usually smd fuses are rated with a standard letter system..

current ratings on that table check out with the fuses on my ps2 mobo's

so, what i can tell, its a smd 1210 package aka chipfuse

the 50 on the device denotes the 5.0amp fusing current.

[Guest loren]

so many surface mounted fuses to choose from, it's unbelievable. I have no idea what characteristics

it needs or how critical the characteristics are ???

http://nz.farnell.com/surface-mount-fuses

[Optical]

best hook it up without the fuse, see how much current is drawn, then get a fuse rated a little bit higher than normal operation

[Guest loren]

 Optical said:

best hook it up without the fuse, see how much current is drawn, then get a fuse rated a little bit higher than normal operation

Someone at work said it would need to take largish spikes (from the solenoid) so should be rated quite a bit higher

than the amount of static current... but also should be a slow blow type fuse, also because of the spikes. The spikes

themselves would be dealt to by the diode and a capacitor. make sense?

[Optical]

yep to all that, you might be better off working out the current actually from the solenoid resistance, the current drawn for a fluctuating voltage can be hard to measure without a scope. I assume it's a 12V peak voltage fed to the solenoid. If the solenoid is 300 ohms (for example), then peak current draw is 40mA at 100% DC

[Durty-Sanchez]

'50' SMD fuses are rated at 2A (Fusable current of 5A) .. +1 on the slow blow type

Edit: I found the datasheet for this badboy (I think) .. might help in the search

[Guest loren]

certainly looks like it. good work

[Stoffa]

wholey crap, you guys sound far to intellectual for my wainuiomata ed-u-cation

[Guest loren]

So finally got round to replacing the fuse... I had 10 arrive a few weeks ago (minimum I could buy).

The new fuses were the same width and diameter etc but only a mm high, so needed tweezers instead

of pliers to put it in place I thought it was going to be a difficult solder job, but was really easy... whole operation of removing old fuse and soldering new, took less than 5 minutes.

Went for a test drive this morning, and it's working again, so the fuse was definitely the culprit

If anyone needs a fuse, let me know.

[kamineko]

sweet. good conclusion

[b18cek]

Hi,

I know this thread is super old, but my Profec B Spec 2 is not working as well. Could you please tell me which component on the circuit board you replaced? Perhaps circle it from the picture of the circuit board on page 1.

Thank you kindly!

[loner]

Pretty sure it was this one. I still have 9 of these fuses knocking around my garage somewhere.

[b18cek]

 loner said:

Pretty sure it was this one. I still have 9 of these fuses knocking around my garage somewhere.

Thanks. How much would you want and where are you located?

[loner]

I don't want anything... I'll just send you a couple... providing I can find them. Pretty sure I'll be able to.

[Ollieh17]

Digging this thread up again! I have a similar problem with my greddy. Could you point me in the direction of the fuse you needed? Or the specs of the fuse. Im in the UK so postage may be a *****

[loner]

Luck for you they are in the UK... plus shipping would be minimal anyway as they weigh nothing at all.

http://uk.farnell.com/bourns/sf-1206s500-2/fuse-5a-24vdc-smd-slow-blow/dp/1652166

[Ollieh17]

 loner said:

Luck for you they are in the UK... plus shipping would be minimal anyway as they weigh nothing at all.

http://uk.farnell.com/bourns/sf-1206s500-2/fuse-5a-24vdc-smd-slow-blow/dp/1652166

Cheers! Found one one bay, samw specification just the voltage rating

Is higher, will this be okay?

[loner]

A piece of wire will work... it's just a fuse... it won't provide any protection though.

I recommend using the correct fuse to prevent more extensive damage should the same fault

occur.

[Ollieh17]

This is the one i found, i assume its the fuse current that is important not the voltage rating. So this fuse will work just as well?

FUSE, SMD, 5A, 0603, SLOW BLOW

Voltage Rating V DC:32V

Fuse Current:5A

Breaking Capacity:50A @ 32V DC

Blow Characteristic:Slow Blow

Series:SF-0603S

Fuse Case Style:0603

SVHC:No SVHC (16-Dec-2013)

MSL:-

Packaging:Cut Tape

[boon]

Voltage rating just has to match or exceed whatever you're using it for.

Check that the case style is compatible, earlier in the thread someone mentions a 1210 style case but 0603 is probably near enough unless the solder pads are tiny.

I hope you have steady hands, soldering SMC sucks if you haven't done it before.