Help with Cannon iP4850 Printer

[selldoor]

Re: Help with Cannon iP4850 Printer

Yes try a dummy run without power to the board

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

I did it,

Dummy run -003

Power on -330

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

Good or bad?

[selldoor]

Re: Help with Cannon iP4850 Printer

Good effort - Now move to the socket at the other end of the board.
Same safety conditions apply though tests on lower voltages
Set your meter on vDC200 I cant see any pin marks unless one is a minus sign.

Basically you need to find which is ground ( May well be the one with the minus on)
see if anything goes from there to the negative side of those smaller caps?
No Power to board while your searching.

Then having established ground (switch power back on) put black probe on ground and test each pin on the socket with the red probe.

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

Heres a pic of the other side of the board. I'm not sure which would be ground?

On the actual connecter, the connection to the pin which says 1, on the connecter says H JST. The second connector says F2. There is also a little x in-between both of these connection points.

The third says 3, the fourth says 4 and the fifth says 5.

Does this help?

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

Do I need to use V Flat Line, three dots 200?

[selldoor]

Re: Help with Cannon iP4850 Printer

Do I need to use V Flat Line, three dots 200? Yes

See pic think second pin is the ground. Just check that the joints marked C-
line up with the white stripe on the side of the caps

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

Do I need to use V Flat Line, three dots 200? Yes

See pic think second pin is the ground. Just check that the joints marked C-
line up with the white stripe on the side of the caps

Thanks again, but not sure which joints marked C you are referring to?

The ones on the bottom side of the board, which say C13, C14 and C15; or the ones on the top side saying CN1, CN2, C1, C2, C4, C10A, C10B, C9, C11, C12?

[selldoor]

Re: Help with Cannon iP4850 Printer

Small red Cs in my picture - must get fonts fixed that is the only size ive got

[selldoor]

Re: Help with Cannon iP4850 Printer

Small red Cs in my picture - must get fonts fixed that is the only size ive got

Hurrah - fixed text toolbar - the wonders of google !

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

Sorry just seen your picture, yes they line up.

I'll test it like this.

Negative probe on second pin, carefully touch red probe on other pins.

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

Results.

2nd (ground) and 1st: 0.00
2nd (ground) and 3rd: 08.6
2nd (ground) and 4th: 0.00
2nd (ground) and 5th: 11.2

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

Once its switched off, do I need to touch the long nose pliers to the big cap soldering points. This drains the excess current or something doesn't it?

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

I guess you've gone offline now

[stj]

Re: Help with Cannon iP4850 Printer

no, if you do that you get a big bang and damage both the cap and the end of the pliers.

if you leave it a while it should discharge - you can test it later wih the meter to see if it's dropped.
when you do, you set the meter to dc and atleast 400v

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

OK thanks.

I'm not sure if you read the whole thread, but i've done the last test, just not sure if the results are good or bad, and what to do next?

[stj]

Re: Help with Cannon iP4850 Printer

and post a foto that shows ALL of the bottom of the board!

[stj]

Re: Help with Cannon iP4850 Printer

i skimmed over it,
if i could see all the underside of the board i'd know how the connector links up.
but i think it's o.k. or atleast it's not dead.
(obviously)

[selldoor]

Re: Help with Cannon iP4850 Printer

just getting a sandwich but i do have to go out.
I think that part is functioning ok but without a service manual or previous experience of printer voltages cant be sure

[SmartestSmarty]

Re: Help with Cannon iP4850 Printer

So basically there's nothing wrong with the power board?

What else would stop the printer not turning on?

Here's a complete pic of the power board: