General information
The Lexmark
TM
MS312 is a single‑function monochrome laser printers designed for small and mid‑sized
workgroups. All information in this service manual pertains to all models unless explicitly noted.
The printers are available in the following models:
Model Configurations Machine type / model
MS312dn and
MS317dn
Duplex, Network (10/100 Ethernet) 4514‑330
The diagnostic information in this manual leads you to the correct field replaceable unit (FRU) or part. Use the
error code charts, symptom index, and service checks to determine the symptom and then repair the failure.
After you complete the repair, perform tests as needed to verify the repair.
To begin diagnosing a problem, go to
“Diagnostics and troubleshooting” on page 37. See “Parts removal”
on page 183 for information about removing and reinstalling parts. See “Parts catalog” on page 292 to help
identify parts.
Media guidelines
Paper guidelines
Selecting the correct paper or specialty media reduces printing problems. For the best print quality, try a sample
of the paper or specialty media before buying large quantities.
Paper characteristics
The following paper characteristics aect print quality and reliability. Consider these characteristics when
evaluating new paper stock.
Weight
The printer trays can automatically feed paper weights up to 90‑g/m
2
(24‑lb) bond grain long paper. The
multipurpose feeder can automatically feed paper weights up to 163‑g/m
2
(43‑lb) bond grain long paper. Paper
lighter than 60 g/m
2
(16 lb) might not be
sti
enough to feed properly, causing jams. For best performance, use
75‑g/m
2
(20‑lb) bond grain long paper. For paper smaller than 182 x 257 mm (7.2 x 10.1 inches), we recommended
to use 90 g/m
2
(24 lb) or heavier paper.
Note: Two‑sided printing is supported only for 60–90‑g/m
2
(16–24‑lb) bond paper.
Curl
Curl is the tendency for paper to curl at its edges. Excessive curl can cause paper feeding problems. Curl can
occur after the paper passes through the printer, where it is exposed to high temperatures. Storing paper
unwrapped in hot, humid, cold, or dry conditions, even in the trays, can contribute to paper curling prior to
printing and can cause feeding problems.
4514-330
General information
27
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