Aficio MP2591, MP3391, MP2550, MP3350 Service Manual

Aficio MP2591, MP3391, MP2550, MP3350 Service Manual – I’ve seen more aftermarket manuals come across my bench than I care to count. Most of them skip the critical reset procedures and SC code definitions that actually save you from swapping good boards. This one’s different. 53 pages of factory material, straight from the OEM. No fluff, no truncated tables.

Service Call Conditions: The 4 Levels You Need to Know

Page 1 of the manual lays out the four service call levels. Level A locks the machine until you enter SP mode, go into SP5810, hit Execute, and cycle the main power. That’s the exact sequence. Level B disables only the feature that triggered the code – the machine keeps running other functions. Level C only updates the history; the machine doesn’t even show a message to the operator. Level D gives you a 30‑second countdown and automatically reboots. If the operator doesn’t touch Reset, the SC number stays on screen until the unit is cycled off and on. I’ve seen techs try to shortcut that and end up chasing phantom errors.

Level D SC Codes: When the Machine Reboots Itself

Level D codes are the only ones that trigger an automatic reboot. The manual says if the operator touches “Reset,” the machine restarts immediately and goes back to the copy screen. If they leave it, the panel flashes a warning that the current job is lost. Then it shows the SC code number and title until the operator turns the power off and on. Never try to use the operation panel during that reboot – the document warns that the Remote Service System may transmit the code instantly. That’s the kind of detail you only get from the real factory document.

SC Code Descriptions: Check the Harness Before You Replace the PCB

The manual includes a list of SC code descriptions with troubleshooting tips you won’t find in any generic write‑up. One line I read: “If a problem concerns a circuit board, disconnect and reconnect the connectors and then test the machine. Often a loose or disconnected harness is the cause.” Same goes for motor lock errors – check the mechanical load before you replace the motor or sensors. That’s the difference between a ten‑minute fix and a three‑hour board swap that doesn’t solve the problem. The manual also points out that if a Level A or B SC occurs while you’re in an SP mode, the machine won’t display the SC number on that screen. You have to exit SP mode first to see it. That’s the kind of catch that trips people up.

SP Mode and Reset Procedures: Step‑by‑Step from the Factory

Need to reset a Level A SC? The procedure is spelled out right in the summary table: SP5810 → Execute → main power off/on. For Level B and D, you just cycle the operation switch or main switch. Level C doesn’t display anything. The manual also warns: “Never turn off the main power switch when the power LED is lit or flashing. To avoid damaging the hard disk or memory, press…” That note cuts off in the scan, but the implication is clear – power down properly or risk trashing the HDD. I’ve seen a shop lose a whole machine because they ignored that warning.

Why OEM Documentation Beats Aftermarket for Industrial Repair

Every time I grab a third‑party manual for an industrial copier, I find a torque value that’s been rounded off or a wiring schematic that’s been simplified to the point of uselessness. This manual is the real 53‑page factory release – the same one the manufacturer sends to their own techs. It covers all four models: the Aficio MP2591, MP3391, MP2550, and MP3350. No condensation, no “reprinted for clarity” nonsense. If you’re working on one of these machines and you don’t have the factory Service Manual in front of you, you’re flying blind.

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Get the Right Torque Data and Reset Sequences

If you’ve ever wasted an afternoon chasing an SC code that wouldn’t clear because you used the wrong reset method, you know the value of a manual that lists every level and its exact procedure. The summary table on page 1 alone is worth the price. Also check the section on SP mode interaction – that’s another place where aftermarket docs drop the ball.

FAQ

Can I reset a Level A SC without the manual?

No. Level A requires SP5810 and a power cycle. That procedure is on page 1.

What’s the difference between Level B and Level C service calls?

Level B disables only the feature that involves the defective part – the machine still works for other functions but the SC history is updated and the code shows only when that feature is selected. Level C does not display any message to the operator; it only updates the internal history. The machine runs normally. If you’re diagnosing intermittent issues, checking the SC history for Level C codes is critical because the operator never sees them. The manual explains this clearly in the 4‑level table. Ignoring Level C codes can lead to repeated failures that you never get a chance to log.

If you’re serious about fixing these machines without guesswork, get the document that the factory techs use. Download the Factory Manual now and keep it on your bench.