bizhub 4750/4050 — Network, Scan-to-Email & Troubleshooting

POM MIS — IT Knowledge Base

Applies to: Konica Minolta bizhub 4750 / 4050 multifunction printers — network setup, Scan to E-mail, toner, paper jams, and troubleshooting

This is a condensed field reference pulled from the full bizhub 4750/4050 User's Guide, covering the parts a store visit actually needs: getting the machine on the network, setting up and using Scan to E-mail, the Address Book, toner replacement, clearing jams, and the common error messages.

1.    Confirm which model you're working on — bizhub 4750 or bizhub 4050 — settings menus are identical between them.

2.    Have the store's network details on hand: whether this machine should use DHCP or a fixed IP address, and the subnet/gateway if fixed.

3.    Have the mail server (SMTP) hostname or IP address and port on hand if you're setting up Scan to E-mail for the first time.

4.    Have the administrator password for this machine — network, e-mail, and address book setup all require Administrator mode, either on the Control Panel or in Web Connection (the machine's web-based admin page, reached by typing its IP address into a browser).

Check the Current IP Address

1.    On the Control Panel, go to Utility > User Settings > Printer Settings > Print Reports > Configuration Page to print it out, or go to Utility > Administrator Settings > Network Settings > TCP/IP Settings to view it directly on screen.

2.    Confirm an IP address is listed. If nothing is assigned, continue with the steps below.

Set or Change the IP Address

1.    Go to Utility > Administrator Settings > Network Settings > TCP/IP Settings.

2.    Confirm TCP/IP is set to Enable.

3.    Under IPv4 Settings, either turn on DHCP (under IP Application Method Auto Setting) for an automatically assigned address, or manually enter the IP Address, Subnet Mask, and Default Gateway.

4.    If the store uses IPv6, enable it under IPv6 Setting and choose automatic or manual addressing the same way.

5.    Confirm a LAN cable is connected to the port on the back of the machine — or, if this unit is on Wi-Fi, check the wireless setup under Extended Network Settings.

Note: Deeper network options — DNS, IPsec, IP filtering — live under this same Network Settings menu, but they're much easier to configure from Web Connection's browser interface than from the small Control Panel screen.

Before anyone can use Scan to E-mail, an administrator has to point the machine at the store's mail server and give it its own "From" address. Do this from Web Connection rather than the Control Panel — it's the only place the full SMTP settings live.

1.    Confirm the network setup above is complete — this machine needs a working IP address before it can reach a mail server.

2.    In a browser, go to this machine's IP address, log in to Administrator mode, then go to Network > E-mail Settings > E-mail TX (SMTP).

3.    Set E-mail TX (SMTP) and Scan to E-mail to Enable.

4.    Enter the SMTP Server Address (hostname or IP) and Port Number (25 by default) — or turn on SMTP Server Automatic Acquisition to pull it from DNS instead.

5.    Enter the Device E-mail Address — this becomes the "From" address on everything this machine scans out.

6.    If the mail server needs encryption, set SSL/TLS to Enable or Start TLS, and check Port Number (SSL) (465 by default).

7.    If the mail server requires a login, turn on SMTP Authentication and enter the Account, Password, and (for Digest-MD5 only) Domain Name. If the environment instead uses POP-before-SMTP, configure that under POP Before SMTP instead.

Note: SMTP Server Address can't be saved until Device E-mail Address is filled in — the two fields are linked.

A saved destination is called an Address Book entry. Up to 2,000 can be stored, covering e-mail, SMB, FTP, and WebDAV destinations combined.

From Utility

1.    Tap Utility > One-Touch/User Box Registration > E-mail > New.

2.    Enter a Name for the destination.

3.    Enter the E-mail address itself.

4.    Turn on Favorite if it's a frequently used address — it'll then show up on the Favorites screen for one-tap selection.

5.    Pick an Index letter so the entry sorts and searches correctly by name.

6.    Tap OK to save.

While Sending a Scan

1.    Tap Scan to E-mail, then Direct Input, and type the address in directly.

2.    Tap Address Reg., then tap the address you just typed to save it.

3.    Give it a Name and Index, then tap Register.

1.    Load the original in the ADF or on the glass.

2.    Tap Scan to E-mail.

3.    Choose the destination — pick a saved Address Book entry, or tap Direct Input to type one in. Multiple destinations can be added to one job.

4.    Tap Application to set scan options (color, resolution, file type) if the defaults don't fit. This is also where you confirm the original's size, so double-check it — an incorrect size can cut off the scanned image.

5.    Press Start.

Note: Tap Check Settings before pressing Start to confirm the destination and options. Press Stop mid-scan to cancel it.

A logged-in user can also tap Scan to E-mail, then Me, to send a scan straight to their own e-mail address without it being in the Address Book — the [Me] key only appears when user authentication is enabled and that user has an e-mail address on file.

Checking Toner Level

1.    Tap Utility > Check Consumable Life to see the remaining toner (and Imaging Unit) life. Tap Print to get a printed list.

What the Messages Mean

Message	What It Means
Toner is low.	Running low — have a replacement cartridge ready.
Replace toner / Install toner cartridge.	Cartridge is empty or not seated correctly — replace or reseat it now.
Imaging Unit will require replacement soon.	The Imaging Unit (separate from the toner cartridge) is near end of life.

Replacing the Toner Cartridge

1.    Press the button on the right side of the machine to open the Front Cover.

2.    Hold the cartridge handle and pull the old cartridge straight out.

3.    Unbox the new cartridge and remove all packaging materials.

4.    Shake the new cartridge gently to redistribute the toner inside.

5.    Line up the arrows on the cartridge's side rails with the rails inside the machine, and slide it in until it's fully seated.

6.    Close the Front Cover.

Note: Use a genuine, unused cartridge only. A refilled or reused one can leave the toner message stuck on-screen even after replacement, and print defects from a non-genuine cartridge aren't covered under warranty.

Replacing the Imaging Unit

Same general process: open the Front Cover, pull out the Toner Cartridge, lift the handle and pull out the old Imaging Unit, unbox and unpack the new one, line up its side rails the same way and slide it in, reinstall the Toner Cartridge, then close the Front Cover.

Note: Don't touch the green drum surface on the Imaging Unit, and don't leave it sitting in direct light for more than about 10 minutes — both will hurt print quality.

Preventing Jams

•  Always square up the paper guides to the actual paper size after loading a tray.

•  Load paper print-side the way the packaging's arrow indicates.

•  Don't load folded, creased, bent, or mixed paper types/sizes together in one tray.

•  Fan a stack of paper before loading it — don't drop a fresh ream straight into the tray.

•  Don't overfill a tray or leave more than ~250 sheets sitting in the output tray.

Clearing a Jam, by Location

In every case: gently but firmly pull the jammed sheet out fully — a torn-off corner left inside will just cause another jam — then open and close the Front Cover afterward. The machine won't clear the jam message until it sees the Front Cover cycle, regardless of where the jam actually was.

Manual Feed Tray

1.    Securely hold both sides of the jammed sheet and carefully pull it out.

2.    Fan the removed paper to re-square the edges, then reload it into the tray.

3.    Open and close the Front Cover.

Tray 1

1.    Fully pull out Tray 1.

2.    Check the lever position, then pull it down to release the jammed sheet, and carefully pull the sheet out.

3.    Fan the removed paper, reload the tray, and close it.

4.    Open and close the Front Cover.

ADF

1.    Remove any originals from the Document Feed Tray.

2.    Open the ADF Feed Cover.

3.    Carefully pull the jammed sheet out, then close the ADF Feed Cover and open/close the Front Cover.

Other Locations

Location	How to Clear It
Trays 2/3/4 (optional feed unit)	Fully pull out the tray, remove the sheet, reload, close the tray, then open/close the Front Cover.
Behind the Front Cover	Open the Front Cover, pull out the Toner Cartridge then the Imaging Unit, lift the internal flap and remove the sheet, then reinstall the Imaging Unit and Toner Cartridge and close the cover.
Rear Cover	Open the Front Cover, pull down the Rear Cover, remove the sheet, then close both covers.
Output Tray	Pull the sheet out, then open/close the Front Cover.
Finisher outlet	Empty the output tray, slide the Finisher's guide plate aside, pull the sheet out, then open/close the Front Cover.
Rear of the Finisher	Open the Finisher's rear cover (and trap cover if needed), remove the sheet, close both covers, then open/close the Front Cover.

Note: The inside of the machine can be hot right after use — give it a moment before reaching behind the Front or Rear Cover.

If Jams Keep Happening

Symptom	Likely Cause / Fix
Multiple sheets feed together	Sheet edges weren't aligned, or the paper is damp — remove, fan, re-square (or dry-swap) the stack, and reload.
Jam message won't clear	A slip of paper is still stuck somewhere in the path — recheck every location above.
Jams during 2-sided printing	Paper is outside the supported weight range, or mixed types are loaded — check the printer driver's paper type setting.
Jams in the ADF	Too many originals loaded at once, an unsupported original, or the ADF width guide isn't set to the original's size.
Jams in a paper tray	Paper loaded crooked or overfilled, the paper guide isn't matched to the size, or damp/bent paper — envelopes and label sheets need the Manual Feed Tray, not Trays 1-4.
Jams in the Finisher	Paper outside the Finisher's supported size/weight range.

Clearing a Staple Jam

1.    Open the cover on the right side of the Finisher.

2.    Pull out the Staple Cartridge.

3.    Lift the face plate and remove the jammed or loose staples.

4.    Close the face plate until it clicks.

5.    Reinsert the Staple Cartridge until it clicks.

6.    Close the Finisher's cover.

Note: After clearing a staple jam, run a few idle staple cycles (2-6) before the next real job — this seats the staples properly.

Won't Power On

•  Confirm the power cable is fully seated in the outlet and the outlet/breaker is live.

•  Confirm the machine's Power Switch (not just the front Power key) is turned ON.

Touch Panel Is Blank

•  Tap the screen or press a Control Panel key — the machine may just be in Power Save/Sleep mode.

•  Press the Power key if a Weekly Timer schedule has put it into ErP Auto Power Off mode outside business hours.

•  Check Utility > Accessibility > Brightness Adjustment in case the display contrast was turned down.

Can't Print

•  "Printer is not connected" / "Print Error" — check the machine is powered on and not in ErP Auto Power Off mode, the network/USB cable is seated, and the correct printer is selected on the computer.

•  Job sent but nothing prints — check Job List on the Control Panel for a stuck or queued job, confirm the machine isn't in Sub Power Off mode, and confirm any account/user login details match if authentication is enabled.

•  Printing fine, but with the wrong paper — check the paper type/size set on the Control Panel for that tray actually matches what's loaded, and that the application's print settings aren't overriding the printer driver.

Can't Scan to E-mail or a Network Folder

Symptom	Check
Scan to E-mail fails outright	Message size may exceed the mail server's limit; confirm the network settings, the Device E-mail Address, and the network cable connection are all correct.
SMB send fails with a path error	Use backslashes, not forward slashes, in the destination file path.
SMB send is slow	Try disabling LLMNR in Web Connection.
SMB "Server connection error"	Check the network cable and that this machine's IP settings and the destination's IP address are both correct.
SMB "login error"	If using a domain account, the domain username needs to differ from any local username on the destination PC, unless both share the same password.

Print Quality Issues

Symptom	Likely Cause
Nothing prints / blank pages	Damaged Toner Cartridge or Imaging Unit, damp paper, or a printer-driver paper mismatch.
Print is solid black	Damaged Toner Cartridge or Imaging Unit.
Print is faint	Low toner, a dirty laser lens, damp paper, or the wrong paper type selected in the driver.
Print is too dark	Damaged Toner Cartridge/Imaging Unit, or copy density set too high.
Smudged background / color bleed	Damaged cartridge or Imaging Unit, or a dirty Original Glass / Original Cover Pad.
Uneven density	Toner running low, or the machine isn't sitting level.

If a message appears that isn't listed here, follow the on-screen instructions directly — this covers the ones that come up most often in the field.

Warnings

Message	What To Do
Memory Overflow	Not enough memory to finish the job — it may only print the first page. Reduce the job size.
HDD is low on disk space.	Delete unneeded data stored on the HDD.
Paper Empty	Load paper into the indicated tray.
Toner is low.	Order/prepare a replacement Toner Cartridge.
Replace toner	Replace the Toner Cartridge (Section 5).
Imaging Unit will require replacement soon.	Replace the Imaging Unit (Section 5).
Replace Staples	Replace the staple case (Section 6).
Exceeds the no. of pages being stapled.	Cancel the job or turn off the staple setting — too many sheets for one staple.
The USB device is invalid.	Disconnect the USB device; it isn't compatible.
Fax Memory Low / Fax RX Job Max Over	Print or delete stored fax jobs to free up space.
Setting an administrator password is required...	Change the administrator password from its default — self-resolves once changed.

Errors

Message	What To Do
There is an open component.	Close the open cover/door.
Paper Jam	Find and clear the jam (Section 6).
Staple Jam	Clear the staple jam (Section 6).
Imaging Unit Installation Error	Reseat the Imaging Unit correctly.
Install toner cartridge.	Reseat the Toner Cartridge and close all covers.
Replace Toner / Incorrect Toner	Replace with a genuine, correct cartridge for this machine.
Incorrect imaging unit	Install a genuine Imaging Unit correct for this machine's region/color.
Paper Size Mismatch / Paper Size-Type Mismatch	Load the correct paper into the indicated tray, or correct the size/type set on the Control Panel.
Paper Empty (during a print job)	Load paper into the tray the job is trying to pull from.
Output Tray Full	Remove the printed paper stacked in the output tray.
Stored Job Error	The machine's option configuration changed since the job was saved — resave or reconfigure to match.
HDD Capacity Over / Document Registration Overload	Delete stored data/files from the HDD.
Connection Failed	Confirm the FTP/SMB/WebDAV destination is registered correctly.
Writing Error (USB)	Confirm the USB drive isn't write-protected, then retry.
Place Original on Glass	The ADF can't handle this original's size — scan from the glass instead.
Place Original on ADF	No original detected in the ADF — load one.
Scan TX Failed	Transmission failed — wait, then retry the job.
Fax/I-Fax TX or RX Failed	Usually self-resolves; if it recurs, check the phone line or network connection.
Counter has reached its maximum allowance.	Delete stored jobs to bring the counter back under its limit.

Note: If a "Service Call" message appears, restart the machine first. If it persists, note the trouble code and sub-code shown on screen — you'll need them for a service call.

1.    If you touched network or e-mail settings, send a test Scan to E-mail to yourself to confirm it actually delivers.

2.    If you replaced toner or an Imaging Unit, confirm the warning message is cleared from the screen.

3.    If this was a service call, note the model (4750/4050), IP address, and any trouble/sub-code on the ticket.