Burned transistor there is always a message in the display panel that says load paper even if there are lots of paper inside the drawer.. when i checked the main board i saw burned transistors.. what was the cause and why? since i encountered this problem 3 times already with 3 different canon 6050 machines..

Is this what it's reporting on its display panel when you try to print? Most likely the paper stop in the drawer has moved or been changed to something other than letter; so the printer thinks it has something other than letter size loaded (probably got moved to A5) The printer "reads" the the drawer stops, it does not "see" the paper it needs.

If job prints from the wrong tray or on the wrong paper or specialty media, this is an indication that the operator panel menu settings do not match the media loaded in the tray.

Make sure the Paper Size and Paper Type specified in the printer driver match the paper size and type in the tray.

For further assistance, please contact Lexmark Technical Support

Hello
If horizontal output gets shorted always, something may be wrong with Line Output Transformer [LOT], or deflection yoke. If LOT windings inside is short, hrozontal output transistor will get overheated, and will be get shorted soon. If there is winding short in the Deflection yoke, even a sinlgle winding gets shorted, it puts a great load on LOT, which in turn effect horizontal output transistor. The third main reason for horizontal output transistor failure is due to an open or dry solder at the capacitor connected to its collector to negative It will be usually 2500pf to 3500pf, according to the TVs screen size. You just check these three and be sure about the fault.
Ok.

Pull paper tray out and set aside,
in the back there is white lever above the spring
push lever in ,a black actuator should drop down
if it does not it may be broken or stuck.
The tray select button on the control panel should allow you to use the side tray.

It means that you under printer properties/preferences - custom paper size have ltr size as your default, change it in desired size, eg. A4.
Then turn off and on the copier.

Or check the sensor position on your drawer. blue rail with triangle that must be on A4 or A3 depends on paper that you have in drawer.

If this is brand new, then it should be under warranty. Call the manufacturer or take it back to the store.

Since tray 2 works, I'd guess that each drawer has a "paper sensor" that sees that paper is in the drawer. You might pull both drawers all the way out, with a flashlight, if needed, look at the area inside of each where paper is fed and you can compare #2 with #1, since you know 2 is good. You may find a sensor out of place. If it's not something simple like it popped out of place, then you may need to put in a new sensor. Good luck, please rate this if it helped.

Hello there,

If you are getting "Paper Jam check drawer two message" I would suggest you to check for any paper stuck inside the paper drawer two. If you don't see any paper jammed inside drawer two, you might also want to check out if its is stuck anywhere in the paper path. Removing the paper jam should fix the issue. Try cleaning the pick rollers (the rollers which pick the paper) in drawer two. This should help fixing this issue.

Merry Christmas!

the sensor board of trays is abnormal check it

Try manually opening the drawer. There's a little hole on the front, Insert a pin or bent paper clip in the hole with the machine "on". Should open for you.