Lexmark MS310 / MS312 / MS315 / MS317: Complete Technical Guide
Lexmark MS310 / MS312 / MS315 / MS317: Complete Technical Guide
Affordable, straightforward to service, and capable of 33 pages per minute -- the Lexmark MS310 family spent most of the 2010s showing up in small offices, home offices, schools, and light workgroup environments across the country. There are still a lot of them out there. If you're managing a fleet or trying to keep a single unit alive past its expected lifespan, this guide covers everything you need -- from identifying which variant you have, to sourcing the right parts, to deciding when repair no longer makes financial sense.
At Argecy, we've been supplying Lexmark printer parts and supporting technicians since 1985. The MS310 family is one we know well. What's here reflects real-world repair patterns, not just spec sheet data.
1. Overview -- What These Printers Are and Why They Matter
Lexmark introduced the MS310 series as a follow-on to the E-series compact laser line, targeting cost-conscious buyers who needed reliable monochrome output without a large footprint. The printer measures roughly 9 inches tall and under 15 inches deep -- a natural fit for a desktop where space is tight.
Print speed is rated at 33 ppm for letter-size output. The engine uses a standard electrophotographic process: laser exposure, toner transfer via a photoconductor drum, and thermal fusing. Connectivity options vary by model but include USB 2.0 as a baseline, with some variants adding Ethernet and wireless.
From a service standpoint, these printers matter because there are a lot of them still running daily. Lexmark built this class of printer with serviceable components -- the fuser, the toner cartridge, the photoconductor unit, and several internal assemblies are all designed to be replaced without specialized factory tooling. That makes them solid candidates for extended service life when maintained properly.
2. Model Variants and Key Differences
The four model numbers in this family share a common engine and chassis. Differences come down to connectivity, memory, and duplex capability. Know which model you have before ordering parts. Some components -- particularly the formatter board and network interface assemblies -- don't cross over between all variants.
| Model | Connectivity | Duplex | Standard Memory | Primary Market |
|---|---|---|---|---|
| MS310d | USB 2.0 only | Yes (auto) | 256 MB | SOHO, personal use |
| MS312dn | USB 2.0 + Ethernet | Yes (auto) | 256 MB | Small workgroup |
| MS315dn | USB 2.0 + Ethernet | Yes (auto) | 512 MB | Workgroup, higher volume |
| MS317dn | USB 2.0 + Ethernet | Yes (auto) | 256 MB | Budget network printing |
The MS317 came later in the lineup -- it's essentially a cost-reduced MS312. Most mechanical components are shared, but the formatter board is different, and it takes a different toner cartridge SKU (the 51B series rather than the 50F series used by the MS310, MS312, and MS315). This is one of the most common ordering mistakes we see. Always confirm your exact model number before purchasing toner or imaging units.
Mechanically, the fuser assembly, paper feed rollers, and photoconductor unit are shared across the MS310, MS312, and MS315. The MS317 shares the fuser design but has a revised paper path assembly with a slightly different pickup roller mounting location. Parts listed generically as "MS310 series compatible" may or may not fit the MS317. Verify part numbers explicitly -- don't assume.
3. Key Part Numbers for Frequently Replaced Components
| Component | Applicable Models | Lexmark OEM Part Number | Notes |
|---|---|---|---|
| Toner Cartridge (High Yield) | MS310, MS312, MS315 | 50F1H00 | 5,000 page yield |
| Toner Cartridge (High Yield) | MS317 | 51B1H00 | 8,500 page yield -- do not substitute 50F series |
| Photoconductor Unit | MS310, MS312, MS315, MS317 | 50F0Z00 | 30,000 page rated life |
| Fuser Assembly (110V) | MS310, MS312, MS315, MS317 | 40X7743 | Confirm voltage before ordering |
| Fuser Assembly (220V) | MS310, MS312, MS315, MS317 | 40X7744 | For international units |
| Pickup Roller | MS310, MS312, MS315 | 40X7593 | Tray 1 -- replace with separator pad |
| Separator Pad | MS310, MS312, MS315 | 40X7591 | Replace as pair with pickup roller |
| Transfer Roller | MS310, MS312, MS315, MS317 | 40X7592 | Replace at fuser interval |
| System / Formatter Board | MS312dn | 40X9138 | Not interchangeable with MS310 board |
Part numbers listed reflect OEM references at time of publication. Always cross-reference against your unit's serial number and firmware level. Argecy maintains a current parts database and can confirm fitment -- see contact information at the end of this guide.
4. Maintenance Kit -- Contents and Recommended Interval
Lexmark doesn't sell a pre-bundled maintenance kit for the MS310 family the way HP does for its LaserJet lines. Argecy and other experienced parts suppliers put together recommended component sets based on actual failure patterns. A practical maintenance kit for this family should include:
- Fuser assembly (110V or 220V as appropriate)
- Transfer roller
- Tray 1 pickup roller
- Separator pad for Tray 1
- Photoconductor unit (if not recently replaced)
Replace the fuser and transfer roller at 200,000 pages or roughly every three years of moderate workgroup use -- whichever comes first. Pickup roller and separator pad replacement is warranted at 100,000 pages or at first sign of feed problems. In practice, many users wait for symptoms rather than following a fixed schedule. Both approaches work. On a fleet, proactive replacement will cut your downtime significantly.
After replacing the fuser assembly, reset the fuser-related maintenance counter through the printer's service menu. Skip that step and you'll get early "fuser life" warning messages that have nothing to do with the condition of the new part.
5. Error Code Reference Table
| Error Code | Description | First Response Steps |
|---|---|---|
| 200.xx | Paper jam in input area / tray | Clear paper path; inspect pickup roller and separator pad for wear |
| 201.xx | Paper jam at fuser entrance | Clear jam; inspect registration roller and fuser entrance guides |
| 202.xx | Paper jam in fuser / exit area | Clear jam; inspect fuser pressure roller for deformation or wrapping |
| 31.xx | Missing or defective cartridge | Reseat toner cartridge; clean cartridge contacts; replace if persistent |
| 32.xx | Cartridge part number not supported | Verify correct cartridge SKU for model (MS317 requires 51B series) |
| 80.xx | Routine maintenance required | Perform maintenance; reset page counter through service menu |
| 840.xx | Fuser life warning or failure | Check fuser page count; replace fuser assembly and reset counter |
| 900.xx | Firmware / controller error | Power cycle; attempt firmware reflash; replace formatter board if persistent |
| 920.xx | Fuser temperature error (hot or cold) | Inspect fuser thermistor connections; replace fuser assembly |
| 940.xx | Transfer roller voltage error | Reseat transfer roller; check HVPS connections; replace transfer roller |
Any error in the 9xx range that persists after fuser replacement and a firmware reflash -- look at the high-voltage power supply (HVPS) board. The HVPS in this family is a discrete assembly and can be replaced without swapping the entire controller board, which keeps repair cost reasonable.
6. OEM vs. Aftermarket Guidance
The MS310 family is one of the most heavily targeted laser printer lines for aftermarket and remanufactured toner cartridges, and the quality variation in that market is wide. Here's where we stand:
Toner Cartridges: Aftermarket toner cartridges for the 50F and 51B series are available from many sources. Quality varies a lot. The most consistent failures we see from low-cost aftermarket cartridges in this family are chip-related -- either the chip doesn't communicate correctly with the printer's firmware and triggers 31.xx or 32.xx errors, or it reports incorrect page counts that cause premature "cartridge empty" messages. If you use aftermarket toner, buy from a supplier with a real quality track record and a clear return policy for defective units.
Photoconductor Units: Use OEM or high-quality compatible PC units. The imaging drum surface is a precision component, and cheap compatible units regularly produce the repetitive-dot defects and background fogging described earlier -- sometimes straight out of the box. The cost savings over OEM aren't worth the diagnostic time and image quality complaints.
Fuser Assemblies: Buy OEM or Argecy-sourced quality compatibles. Don't go generic here. We see a clear pattern of premature failure in low-cost compatible fusers for this family -- sleeve separation at the edge, early heat element burnout. A failed fuser can jam and damage other components, turning a routine maintenance item into a much more expensive repair. The price gap between a quality fuser and a throwaway one is small. The risk difference is not.
Pickup Rollers and Feed Components: Compatible feed rollers are generally fine for this family if you're sourcing from a reputable supplier. The rubber compound in OEM rollers isn't dramatically better than what quality compatible manufacturers provide in this price class.
7. Repair vs. Replace Decision Framework
The MS310 family is a low-to-mid cost printer. The repair-versus-replace decision requires honest math. This framework comes from 40 years of working on Lexmark equipment:
- Repair makes sense when the required parts cost less than 40 percent of a comparable replacement printer's current street price, the failure is in a known-serviceable assembly (fuser, feed rollers, photoconductor), and the unit has fewer than 200,000 lifetime pages on the engine.
- Repair gets questionable when multiple assemblies have failed in the same service cycle, the formatter or HVPS board needs replacement, or the unit is well past 300,000 lifetime pages without a prior full maintenance rebuild.
- Replace it when repair cost exceeds 50 percent of replacement cost, when the failure is in the main drive motor or laser scanner assembly (expensive parts, labor-intensive to swap), or when the unit's page-count history is unknown and you're already seeing multiple symptoms at once.
For fleet management, the crossover point typically lands around 150,000-175,000 pages per unit when proactive maintenance hasn't been done. Units that got regular pickup roller and fuser replacements on schedule often stay cost-effective well past 250,000 pages. Keep your maintenance records. They're the single most useful data point when you're making this call.
8. Frequently Asked Questions
Q: My MS317 keeps rejecting the toner cartridge I ordered. It worked fine in my old MS312. What is happening?
The MS317 uses a different toner cartridge series (51B) than the MS310, MS312, and MS315 (which use 50F series cartridges). The cartridges look similar but contain different chips that communicate with the firmware differently. A 50F cartridge in an MS317 will trigger a 31.xx or 32.xx error. Match the cartridge to the specific model number, not just the printer family name.
Q: The print quality on my MS310 is fine except for a small black dot that repeats exactly the same distance apart down every page. What causes this?
A repeating defect at a fixed interval is almost always a drum or roller contamination issue. Measure the distance between the dots. An interval of approximately 75 mm points to the photoconductor drum. Around 38 mm, suspect the developer roll in the toner cartridge. Closer to 63 mm, look at the fuser pressure roller. Replace the component whose circumference matches the defect interval -- multiply the interval by pi to cross-check against component diameter if needed.
Q: After replacing the fuser on my MS315, it still shows a maintenance warning. Did I get a bad fuser?
The fuser is almost certainly fine. The maintenance warning is driven by a software counter in the printer's NVRAM -- not by any direct sensing of the fuser's physical condition. You have to reset the maintenance page counter through the printer's hidden service menu after replacing the fuser. That means entering the Diagnostics menu at startup by holding specific button combinations during power-on (consult the Lexmark service manual for the exact sequence for your firmware version). Skip that step and the maintenance warning will stay on no matter how many fusers you install.
Q: Can I upgrade the memory in my MS310d to improve performance with large print jobs?
No. The MS310d ships with 256 MB of onboard memory and there's no user-accessible expansion slot. Memory is soldered to the formatter board. The MS315dn comes from the factory with 512 MB and handles complex jobs more smoothly. If memory capacity is a recurring problem with the MS310d, adjust the print driver settings to reduce spooling overhead, or consider stepping up to a unit from the MS41x or MS51x family, which have larger standard memory allotments and actual expansion capability.
Q: How do I tell if the problem I am seeing is the toner cartridge or the photoconductor unit?
Pull the photoconductor unit and toner cartridge together, then separate them in a darkened area. Inspect the photoconductor drum surface with a penlight held at a low angle -- you're looking for scratches, grooves, toner buildup in a specific pattern, or discoloration. Then check the toner cartridge's developer roll for the same kinds of defects. If you see a physical mark on the photoconductor drum that lines up with your print defect (accounting for drum circumference), the PC unit is the source. If the drum looks clean and uniform, try a fresh toner cartridge first. It's the cheaper swap, and it's the right place to start before committing to a new PC unit.
9. Closing
The MS310 family is a durable, well-supported printer line that rewards attentive maintenance and careful parts sourcing. Whether you're troubleshooting a single unit or managing a fleet, keeping these machines running comes down to using the right parts for the right model variant, following a realistic maintenance schedule, and not cutting corners on fuser and photoconductor quality. Argecy has been supporting Lexmark printer repairs since long before these models existed, and we carry the parts, the knowledge, and the hands-on experience to help you get any MS310-series unit back to full operation quickly. Browse our full Lexmark parts inventory at https://www.argecy.com/lexmark-parts, or reach out to our technical team directly at https://www.argecy.com/contact-information if you need help identifying a part, diagnosing an unfamiliar symptom, or working through a repair-versus-replace decision on a specific unit.
10. Common Failure Points in Order of Frequency
3.1 Paper Feed and Pickup Failures
The single most common complaint across all four variants is paper misfeeds and failure to pick from the main tray. The rubber pickup roller and separator pad wear out with normal use, and Lexmark's OEM rubber on these parts tends to harden in low-humidity or high-temperature environments. Symptoms include the printer cycling through the pickup motion without grabbing paper, multi-feeds, or jams right at the start of the paper path near the tray.
Start with the pickup roller. It should feel tacky and slightly yielding when pressed. Glazed or shiny? It's done. The separator pad should offer noticeable resistance when you slide paper across it. If it feels slick, replace it. These two parts almost always go together. Replace them as a pair, every time.
3.2 Fuser Assembly Failures
The fuser is the second most frequent failure. The MS310 family uses a compact fuser that runs at moderate thermal load for a 33 ppm engine, but the fuser film sleeve and pressure roller still have a finite life. Symptoms include toner that smears or wipes cleanly off the page (cold fusing -- usually a failed thermistor or heating element), vertical streaks or voids that persist after replacing the toner cartridge, and paper wrapping around the fuser roller.
Wrinkled output near the trailing edge of the page points to pressure roller wear or deformation. A shiny band across the page means sleeve degradation. Neither of those is a field repair. The fuser is a replace-as-assembly unit on this family. Don't try to rebuild it.
3.3 Photoconductor Unit Degradation
The photoconductor (PC) unit is a separate consumable from the toner cartridge -- that's the correct design. The problem is that many users and even some IT departments don't know the PC unit has its own replacement interval. It'll produce image quality defects well before it throws a hard error. Watch for repetitive dots or streaks at a fixed interval down the page (drum pitch is approximately 75 mm), gray background in white areas, and loss of fine detail in dense image areas.
Plan on replacing the PC unit around every 30,000 pages under normal conditions. Units that sit unused for extended periods -- especially with light or ozone exposure -- can degrade faster than page count alone would suggest.
3.4 System Board and Firmware Issues
The formatter board in the MS310 family is generally reliable. But it does fail -- especially in environments with unstable power, or in units that have taken a surge. A failing or failed formatter shows up as the printer hanging at the startup screen, repeated network connectivity drops on networked models, or persistent error codes that won't clear after you've done what they ask.
Before you order a formatter board, try a firmware reflash. Lexmark provides update utilities for this family, and a corrupted firmware install can mimic a hardware failure convincingly. Reflash first. Then decide.
3.5 Tray and Paper Path Mechanical Wear
On high-mileage units -- over 150,000 pages -- the plastic tray guides, registration roller assembly, and duplex path components show wear. Skewed or misaligned output at that page count usually traces back to the registration roller assembly, not the tray guides. Inspect the registration roller for flat spots and check the registration clutch for proper engagement before assuming it's a tray issue.