A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.
Blessed are they who can laugh at themselves, for they shall never cease to be amused.
I don't reply to private messages from end users.
Last edited by Bojan2S; 04-01-2021 at 08:21 AM.
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
Last edited by Bojan2S; 06-12-2021 at 08:21 AM. Reason: More info
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.
Last edited by blackcat4866; 06-12-2021 at 09:42 PM.
If you'd like a serious answer to your request:
1) demonstrate that you've read the manual
2) demonstrate that you made some attempt to fix it.
3) if you're going to ask about jams include the jam code.
4) if you're going to ask about an error code include the error code.
5) You are the person onsite. Only you can make observations.
blackcat: Master Of The Obvious =^..^=
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)
Last edited by Bojan2S; 06-13-2021 at 01:37 AM. Reason: More info
Good catch. =^..^=
If you'd like a serious answer to your request:
1) demonstrate that you've read the manual
2) demonstrate that you made some attempt to fix it.
3) if you're going to ask about jams include the jam code.
4) if you're going to ask about an error code include the error code.
5) You are the person onsite. Only you can make observations.
blackcat: Master Of The Obvious =^..^=
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).
Last edited by Bojan2S; 06-13-2021 at 04:48 AM.
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