trouble shooting low voltage power on canon IR C2550i

[shizam]

Hi All,

Second attempt on this post so apologies if it ends up double posting.

I have an IR2550i which fails to warm up when the power is switched on. It halts, maybe a second or two after power is switched on with either a 227-001 or 227-004 error, depending on whether or not the reader "twitches" once on power up.
I have disconnected , cleaned, and reconnected all the PCI cards and ram on the mainboard as I was originally getting random errors including a 747, but now only get the 227 errors.

The one time I managed to get it to startup, after I cleaned all the connections on the main board, it had a false message about the front door being open, then the side door when they were both closed.

How can I troubleshoot the low voltage power to see if it requires a new low voltage power supply?
The symptoms sound exactly like the FM3-8179-010, technical bulletin ref F2-T01-N13-10061-01? for the 2020i series, but I think I have a different LVPS configuration/PCB.


Any tips on diagnosing if it needs a new power supply?
It seems, on the 2550i, that the LVPS is part of the Main power supply "module" bottom right in the back of the machine.

Thanks!

[shizam]

I can't seem to track down a service manual for this machine, but I do have a 3380/2880 series service manual which, I think, is similar, however the PCB part numbers do not match whats in my machine...

[teckat]

Replace power supply

U probably have a poor 24v.
Check the connections__remove>reseat.
Check 24v

[shizam]

tried reseating all connections with no luck.
Replaced the power supply and all is working AOK.

Thanks

[teckat]

tried reseating all connections with no luck.
Replaced the power supply and all is working AOK.

Thanks

Welcome :-))

[shizam]

Seems like such a waste.
The whole new power supply has a cage, and 2 PCBs full of components. It looks like a single big diode on the old board failed/overheated causing all the problems....but no time to troubleshoot component level repairs!

Image quality is great and the machine is quite low mileage......now that I can turn it on!


Cheers
S

[teckat]

Seems like such a waste.
The whole new power supply has a cage, and 2 PCBs full of components. It looks like a single big diode on the old board failed/overheated causing all the problems....but no time to troubleshoot component level repairs!

Image quality is great and the machine is quite low mileage......now that I can turn it on!


Cheers
S

A+ C-.jpg

Think of a diode as a one-way street for electricity. When the diode is in forward bias, the diode allows traffic, or current, to flow from the anode, towards the cathode leg. In a reverse bias current is blocked so there is no flow of electricity through the circuit.
When current is flowing through a diode, the voltage on the positive leg is higher than on the negative leg, this is called the diode's forward voltage drop. The severity of the voltage drop is a function of the semiconductor material that the diode is made from.
When the voltage across the diode is positive, a lot of current can flow once the voltage becomes large enough. When the voltage across the diode is negative, virtually no current flows.

[shizam]

More precisely, the component is a rectifier/SIP ul bridge. So like 3 diodes in a single package . I haven't confirmed it for sure, but it definitely looks smoked!

component part is a D15XB60, 4 pin SIP.

all academic now though as I have another power supply working well.

[teckat]

More precisely, the component is a rectifier/SIP ul bridge. So like 3 diodes in a single package . I haven't confirmed it for sure, but it definitely looks smoked!

component part is a D15XB60, 4 pin SIP.

all academic now though as I have another power supply working well.