Samsung CLX-6260FW printer prints blank pages.. most of the time

[Crowfeather]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

I tried and the service manual I found is pretty useless for low-level debugging.. no circuit schematics. Basically, it says "if blank page is printed, replace main board or LSU".
Anyway... we shall see soon.

Just had a look as I'm sure I remember there being some diagrams. It has Circuit Schematics are under Connection Diagram I believe Section 5.2 there are some other diagrams showing where the output sits around the chasis / unit.

I don't really get involved in board repairs, so I don't know what information might be needed that are missing from these diagrams.

It looks like votlage and resistance for individual components are then listed elsewhere. So I'm not sure if that helps at all.


Under troubleshooting I have the below information:

Bad contact on OPC - Check terminal to ground of OPC
LSU not working - Check LSU connector
Not working developing bias voltage on HVPS - replace HVPS

So you are looking at the second section, which is replace LSU/Connector as you checked the connector and that is where the fault seems to be.


I don't think its possible for the mainboard to cause this issue without you getting some other associated error code such as an LSU failure. The only thing loosely related would be if no image is being processed in which case reflashing firmware would fix that.

[Bojan2S]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

Just had a look as I'm sure I remember there being some diagrams. It has Circuit Schematics are under Connection Diagram I believe Section 5.2 there are some other diagrams showing where the output sits around the chasis / unit.

Could you send me a link with main board schematic diagram? It would be useful if signals are marked, with time diagrams..

LSU not working - Check LSU connector
So you are looking at the second section, which is replace LSU/Connector as you checked the connector and that is where the fault seems to be.
...

Yes...
Board is on its way, will be here tomorrow or after holidays. If the problem doesn't do away, it will be LSU or cable.
As for cable, I will probably be able to repair the existing one (cut off 1cm from ends and remove insulation for connector), but for LSU... not so sure. I haven't dismantle it yet anyway...

[Crowfeather]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

Could you send me a link with main board schematic diagram? It would be useful if signals are marked, with time diagrams..




Yes...
Board is on its way, will be here tomorrow or after holidays. If the problem doesn't do away, it will be LSU or cable.
As for cable, I will probably be able to repair the existing one (cut off 1cm from ends and remove insulation for connector), but for LSU... not so sure. I haven't dismantle it yet anyway...

I'm not sure what we're allowed to post on here, but if you search the model and service manual in google, I think it is listed on one of those manual sites which will show in the top 3 results.

[Phil B.]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

I'm not sure what we're allowed to post on here, but if you search the model and service manual in google, I think it is listed on one of those manual sites which will show in the top 3 results.

most times if other users see the contributor Badge, they are willing to help with manuals and firmware.

any contributions strictly go to keeping CTN up and running.

a good thing is to read the forum rules https://www.copytechnet.com/forums/misc.php?do=vsarules PLEASE note rule #3 ALL requests for manual are to be posted in https://www.copytechnet.com/forums/s...nual-requests/

also please reviews the FAQ's section https://www.copytechnet.com/forums/faq.php

[tsbservice]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

most times if other users see the contributor Badge, they are willing to help with manuals and firmware.

any contributions strictly go to keeping CTN up and running.

a good thing is to read the forum rules https://www.copytechnet.com/forums/misc.php?do=vsarules PLEASE note rule #3 ALL requests for manual are to be posted in https://www.copytechnet.com/forums/s...nual-requests/

also please reviews the FAQ's section https://www.copytechnet.com/forums/faq.php

Thanks brother for this as always thorough explanation.
I think Crowfeather reply was truly respectful and in perfect unison with what this site and members here may deserve and expect so I liked it

I'm not sure what we're allowed to post on here, but if you search the model and service manual in google, I think it is listed on one of those manual sites which will show in the top 3 results.

[Phil B.]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

Thanks brother for this as always thorough explanation.
I think Crowfeather reply was truly respectful and in perfect unison with what this site and members here may deserve and expect so I liked it

By all means his post was appropriate, I made the mistake of replying to him instead of the OP.
I was lazy. I should have copied, deleted, and replied to the OP, I hope I didn't offend.

Sent from my SM-G960U using Tapatalk

[tsbservice]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

By all means his post was appropriate, I made the mistake of replying to him instead of the OP.
I was lazy. I should have copied, deleted, and replied to the OP, I hope I didn't offend.

Sent from my SM-G960U using Tapatalk

No worries, no offense taken Phil. Plus I'm sure you're not lazy at all
Just wanted to give him credit he deserves for his posts(not only this one).

[Bojan2S]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

If you get an error message after replacing the board, about incompatible toners, you'll need to reset the machine and change the default country to the relevant one.

The board arrived, it is alive and I do have an error "toner not compatible".
I reset the machine and it seems it works...
But the original problem is still there.
Copy one page and that's it.
So I need to dig deeper into LSU unit.

[Crowfeather]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

The board arrived, it is alive and I do have an error "toner not compatible".
I reset the machine and it seems it works...
But the original problem is still there.
Copy one page and that's it.
So I need to dig deeper into LSU unit.

[Bojan2S]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

Yes.. this appears to be the next step... Cable is high density 0.5mm pitch.. but I will have a look the other end first, in case something else is obvious.
I found seller in US (LSU is for U$$ 68.00, not sure how much is for postage, probably arm and leg..)

[Bojan2S]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

In the meantime, I stumbled on another problem - printer doesn't start, all that's happening are clicks from speaker every 3-4 seconds.
This happened before once or twice, but after couple of 10s of seconds the printer started normally so I forgot about it.
I put in the old Main board (which was proved to be working OK), the problem remained..
The waveform below is from CON3, yellow wire (pin 1, lowest). Service manual says there should be 5V there.. and it's continuous when I disconnect the load (Main board connector).
c_141.jpg
Does anybody have SMPS schematic?
Service manual also mentions Connector 4 on SMPS, connected to CN19 on main board with cable where the 24V should be switched ON.
c_142.jpg

Thanks in advance!
Bojan

[blackcat4866]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

I haven't worked on this particular Samsung ... or any Samsungs in the last 10 years.

Typically HVT troubles manifest as:
Black or single color background, caused by lack of primary charge.
Bars in the crossfeed direction caused by varying developer bias.
Light images for black or a single color color caused by lack of transfer voltage.
On many machines that use spring contacts you can experience any/all of these same faults because of a poor spring connection.

Blank images are most often caused by the laser unit or the board that performs the image processing.

[Bojan2S]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

I loaded 5V output of SMPS with 6 Ohms (0.83 A).. and this is the result, similar to the situation when the whole printer system is connected.
c_143.jpg

SMPS is definitely faulty, it is supposed to deliver <3.5 A (17W).

Then I removed SMPS board from printer, and on the first inspection it was obvious the two caps on the below picture were swollen..
c_144.jpg

After caps are replaced, SMPS is OK (loaded with 2 A, no voltage ripples)

[blackcat4866]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

Good catch. =^..^=

[Bojan2S]

Re: Samsung CLX-6260FW printer prints blank pages.. most of the time

This printer is falling apart..
Now I have another problem "Scanner is locked"
I must have done something wrong when assembling.. When I press "Stop" button, scanner moves to the right for ~5 cm and stops.. with the same error. Now it is at the right limit, and it doesn't move to left any more

EDIT: Post corrected.. In original I swapped left and right (sometimes I am prone to errors like this).