Samsung CLP300 jams when normally printing, but will print test

The Lexmark Printer you are having a very sensitive printer.

Normally this tyoe of Printers are very very slow in Printing job.
Comparing with other laserjet used.

If the Laptop / Printer are under warranrty, the Service engineer
can rectifity the printer jamming.

Solutins :

Make the Printer - Monthly service compulsory.
Use only good quality paper in the Lexmark Printer.
Do not pull the paper through hand, when the print out is coming.

Regards

this printer only supports up to 120gsm paper,any thing thicker will get jamming errors

Time to change the paper pick rollers located in the tray, above the tray on an arm, or any combination of these locations.

Check if a piece of paper is still left from the paper jam. Sometimes pieces of paper get stuck behind the feeder roller if the paper is torn while removing the jammed paper

open access(load area) check feed roller take a q tip and use rubbing alcohol and clean photo eye that detects paper be sure all jammed paper is removed

most jams are at the exit and there may be some paper obstructing that area

insert card stock through the paper path

insert ine

after checking no paper left on rollers etc, turn printer of for a while and then turn back on and press the paper release button

You may need to empty the excess toner bottle, it's in the front, to the left side.

1. First, clean your printer. Get some spray-n-wipe cleaner and a clean cloth and clean the entire inside of the printer. Also ensure your paper isn't dirty. Now print a test page. Does the symptom persist?
2. Remove all jammed paper. Check the paper tray first. Look closely at the paper rollers nearest where the paper exits the printer; this is a common source of jams. If you’re trying to print labels, they will often jam just before exiting the printer.
3. Try to print a test page. Does the printer still jam? If you can find no source of the jamming, check the printer's message display window and refer to your user’s manual to look up the printer error code.

OR=

1. Check the printer and/or the software to see if "manual feed" is selected. If manual feed is selected, the printer may be looking for paper in another tray.
2. Reseat paper. Ensure printer is on-line. Check for paper jams or obstructions.
3. Likely suspect: paper-out sensor is damaged or broken. Consult a computer repair shop.

The samsung printer have three paper jam sensors. First (paper jam 0) after the feed rollers. Second (paper jam 1) at the left of the feed rollers and third (paper jam 2) at the fuser unit where it is hot. You can see the actuator between the two white rollers. Paper jam 2 is mainly cause by the scrappers out of position on the side of the upper heat rollers.You will have to clean it and put it back into position.

See the manual. It looks as if 120g/m2 is the heaviest paper it can use:
"Set Type to correspond to the paper loaded in the tray from
which you want to print. This will let you get the best quality
printout. If not, print quality may not be acheived as you want.
Thin: Less than 19 lb (70 g/m2) thin paper.
Thick: 24 lb to 32 lb (90~120 g/m2) thick paper.
Cotton: 20 lb to 24 lb (75~90 g/m2) cotton paper such as Gilbert
25 % and Gilbert 100 %.
Plain Paper: Normal plain paper. Select this type if your printer is
monochrome and printing on the 16 lb (60 g/m2) cotton paper.
Recycled: 20 lb to 24 lb (75~90 g/m2) recycled paper.
Color Paper: 20 lb to 24 lb (75~90 g/m2) color-backgrounded
paper."