QMS Magicolor WX User Manual page 191

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Sharp Horizontal Lines (across the feed direction)
Place a service call (see "Placing a Service Call" on page 1-36).
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Transparency Quality Problems
Make sure the printer is set for transparency printing: use the
printer driver to tell the printer transparencies are in the currently
selected cassette. See chapter 2, "Printing," for information on
using the printer driver.
Make sure the transparency stock is in good shape and meets all
the specifications in chapter 2, "Printing."
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Vertical Streaking
Vertical streaks in printouts usually indicate a problem with the
OPC belt. If you see vertical streaks, try the following procedures
(see chapter 5, "Maintenance," for illustrations of these
procedures).
Caution: The OPC belt is extremely sensitive to bright lights and
direct sunlight. Limit exposure to light to under 2 minutes. Also,
handle the belt carefully, using either the two green side-handles
or using the green end-handle when possible. Set it down only on
a clean, lint- and dirt-free surface, such as fresh paper.
a Reset the OPC belt cartridge: open the manual-feed tray and
pull the OPC towards you about 4" (10 cm) and reseat it.
Repeat this twice. Print a page to see if this solved the
streaking problem.