Question about IBM 6400 Matrix Printer

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057 close platen - IBM 6400 Matrix Printer

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Load the paper and close the forms thichness guide. If the error does not clear, power off and unplug the printerRemove the paper guide assy or pedistal top cover. Disconnect connector P107from controller PCB. Check continuity of platen interlock switch from P107 to switch. Replace the platen intetrlock switch if it fails continuity

Posted on Oct 14, 2009


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The print is only clear on the left side of the forms...

Platen Gap Adjustment (Figure 35)
IMPORTANT Only do this procedure if the original equipment shuttle frame assembly or platen has been replaced by a new or
refurbished unit.
1. Prepare the printer for maintenance (page 338).
2. Remove the shuttle cover assembly (page 357).
3. Loosen the platen open belt (page 415, steps 2, 3, and 4).
4. Raise the forms thickness lever (1) to the fully open position.
5. If you are adjusting any model except the 6400-i20, select a 0.011 inch (0.28mm) flat feeler gauge.
If you are adjusting a 6400-i20, select a 0.012 inch (0.30 mm) flat feeler gauge.
ATTENTION Do not force the platen against the feeler gauge. Damage to the hammer tips will result.
6. Insert the feeler gauge (2) straight down between the hammer bank cover plate (3) and ribbon mask (4), within four
hammer positions of the left end of the hammer bank.
ATTENTION Adjust the platen set screws less than 1/4 turn on one side, then check the other side. Adjustment sensitivity is
approximately 0.03 inch per revolution of the set screw. Also, insert the feeler gauge no more than two inches down
from the top of the ribbon mask.
7. Gently close the forms thickness lever (1). As the platen is closing, gently slide the feeler gauge up and down, keeping it
between the hammer tips and ribbon mask. If the feel is too tight as the platen closes, adjust the 3/32 inch set screw (5)
counterclockwise. If the feel is too loose, adjust the set screw clockwise. With the forms thickness lever closed all the way,
the feeler gauge should contact both the tips and the ribbon mask and move with light friction. Shift the gauge slightly to
8. Repeat steps 4 through 7 at the right end of the hammer bank.
9. After adjusting both sides, check the gap again at both ends. Readjust if necessary.

Aug 25, 2009 | IBM 6400 Matrix Printer

1 Answer

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I can't remember which models have which features, but some Swintecs have pop out plantens, and some don't. If it is pop out, you will find a plastic V clip in the frame of the typewriter through which the platen shaft passes on both sides of the typewriter and platen. Pay close attention to which side the gear of the platen is situated before removing to make sure you put it back on the same side of the typewriter. Squeeze the V clips and pull the platen up and out. When re-installing, make sure the metal paper table is in correctly by aligning the fingers on each side into their mounting guides, or you will have paper jams, paper feed trouble, and other issues. You can clean the labels out with something that will not leave an oily residue on the paper table, paper feed rollers, or the platen. Re-install the platen by aligning the V clips to the frame on each side, and press them down until they snap into place.

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Its located in the adjustment section of the platen control or in the platen itself.

Lexmark may still be supporting this model printer.

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