HP ENVY 6120e
HP ENVY 6120e: replace ink and check estimated levels
Remove and seat the cartridges in an HP ENVY 6120e, check estimated ink levels, and know when alignment is expected after fitting a new cartridge.
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Ink & toner
Find model-specific help with printer ink and toner.
Brother HL-L2445DW
Check the Brother HL-L2445DW toner level
Find the black toner supply indicator in Brother Mobile Connect, or check estimated toner and drum life on the printer’s LCD.
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Brother HL-L2445DW
Replace the Brother HL-L2445DW drum and reset its counter
Move the toner cartridge into a new drum, reinstall the assembly and reset the drum counter. Reset the counter only when a new drum has been fitted.
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Brother HL-L2445DW
Install or replace toner in the Brother HL-L2445DW
Fit the toner into its separate drum unit, clean the corona wire and refit the assembly. Initial installation and replacement have different starting points.
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Canon PIXMA G3590
Deep-clean the Canon PIXMA G3590 print head when needed
Use a nozzle check to choose normal cleaning or Deep Cleaning on the Canon G3590. Check ink and maintenance-cartridge capacity, and leave the printer plugged in during the required wait before repeating a deep clean.
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Canon PIXMA G3590
Refill Canon PIXMA G3590 ink tanks and check the level count
Refill the Canon PIXMA G3590 with the correct ink colours up to the upper limit line, close the tanks and reset the level count only when the required tanks are full.
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Canon PIXMA G3590
Replace the printheads on a Canon PIXMA G3590
Use the G3590 Head Replacement menu, check ink and maintenance capacity, fit the colour and black heads in their correct holders, then check the output.
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Canon PG-540 black and the colour cartridge shown
How to refill Canon black and colour ink cartridges
Refill the PG-540 black cartridge and the colour cartridge shown in Professor Printer’s video, using separate syringes, the demonstrated ports and slow injection.
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Canon PIXMA MG3620
Check ink levels on Canon PIXMA MG3620 and MG3650
Read the black and colour cartridge estimates in Canon PRINT, a browser or the Canon Windows driver. Used or refilled cartridges can report unreliable levels; an error needs its actual support code.
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Canon PIXMA MG3620
Clean the print head on Canon PIXMA MG3620 and MG3650
Use ordinary cleaning only when the nozzle pattern needs it. After two unsuccessful standard cleanings, Canon allows deep cleaning, with a 24-hour wait before repeating that deeper cycle.
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Canon PIXMA MG3620
Handle ink warnings 1686 and 1688 on Canon MG3620 or MG3650
Read the exact error before acting. Replacing the affected cartridge is one option; the documented five-second Stop action for 1686/1688 disables ink monitoring and does not refill or repair a cartridge.
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Canon PIXMA MG3620
Print a nozzle check on Canon PIXMA MG3620 and MG3650
Print the diagnostic pattern with one Alarm flash, then look for missing lines or white streaks before deciding whether cleaning is needed.
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Canon PIXMA MG3620
Replace ink cartridges in Canon PIXMA MG3620 and MG3650
Confirm the regional cartridge number, wait for the holder to stop, then fit colour on the left and black on the right. Never force the head cover open.
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Canon PIXMA TR4755i
Check ink levels on Canon TR4755i and TR4720
Open Setup → Ink information → Remaining ink to read the cartridge indicators. Treat a low-ink warning and an ink-recognition error as different conditions.
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Canon PIXMA TR4755i
Print a nozzle check on Canon TR4755i and TR4720
Use Setup → Maintenance → Nozzle check, then inspect missing lines, horizontal streaks or absent colour before deciding whether to clean.
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Canon PIXMA TR4755i
Faint or missing colours on Canon TR4755i and TR4720: check and clean
Match paper settings, check ink and print a nozzle pattern. Use ordinary cleaning only for a deficient pattern, then follow Canon’s limited deep-cleaning sequence if needed.
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Canon PIXMA TR4755i
Replace ink cartridges in Canon TR4755i and TR4720
Check the exact regional ink number, wait for the holder to stop and fit colour on the left, black on the right. Lock each cartridge until it clicks, then check the LCD and next print.
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Canon PIXMA TS3750i
Check estimated ink levels on a Canon PIXMA TS3750i
Open your printer in Canon PRINT to view the ink estimates. You can also read the black and colour ink lamps; a flashing error needs its exact LCD code, not just a low-ink guess.
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Canon PIXMA TS3750i
Clean the print head on a Canon PIXMA TS3750i
Use Setup code 2 for ordinary cleaning, then print and compare a nozzle check. Clean only for a deficient pattern and follow Canon’s limited escalation if two ordinary cycles fail.
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Canon PIXMA TS3750i
Install or replace ink cartridges in Canon PIXMA TS3750i
Fit the colour and black cartridges in the TS3750i, secure the locking levers, then complete Canon’s alignment check.
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Canon PIXMA TS3750i
Print and read a nozzle check on a Canon PIXMA TS3750i
Use Setup code 1 to print a Canon PIXMA TS3750i nozzle check, then look for missing lines, horizontal white streaks or a missing colour.
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Epson EcoTank ET-2850
Epson ET-2850 sublimation setup: Professor Printer’s method
Prepare a new, unfilled EcoTank for sublimation using the ink-first setup sequence explained in the video, followed by charging, nozzle checks and sublimation paper.
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Epson EcoTank ET-2856
Check ink levels on an Epson ET-2856 or ET-2850
Look at all four tank windows to check the ink actually remaining. Smart Panel shows an estimate; a full-looking app indicator is not proof that a tank is full.
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Epson EcoTank ET-2856
Check missing colours on an Epson ET-2856 or ET-2850
Use a nozzle pattern to distinguish missing ink from an alignment issue, clean only when needed and observe the ink-level and waiting limits before Power Cleaning.
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Epson EcoTank ET-2856
Print a nozzle check on an Epson ET-2856 or ET-2850
Print the nozzle pattern from Maintenance and inspect each black and colour line. Choose the next action from missing segments, rather than cleaning a printer whose pattern is already complete.
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Epson EcoTank ET-2856
Refill ink in an Epson ET-2856 or ET-2850
Use the correct ink for the exact model and region, fill the matching tank to its upper line without squeezing the bottle, then update only the levels you actually refilled.
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Epson EcoTank ET-2856
Set the recorded ink level on an Epson ET-2856 or ET-2850
Use Settings → Maintenance → Set Ink Level to match the stored estimate to the ink you can actually see. This is different from filling a tank or resetting it to 100%.
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Epson EcoTank ET-2950
Clean the printhead on an Epson ET-2950 or ET-2959
Choose ordinary or power cleaning from the nozzle pattern, let the cycle finish and check again. Use Epson’s waiting limits instead of repeating maintenance indefinitely.
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Epson EcoTank ET-2950
Print a nozzle check on an Epson ET-2950 or ET-2959
Print and inspect the nozzle pattern before choosing maintenance. Complete lines need no cleaning; missing segments call for the appropriate next check.
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Epson EcoTank ET-2950
Refill the ink tanks on an Epson ET-2950 or ET-2959
Choose the correct ink for your exact printer and region, refill each matching tank to its upper line, then complete the ink-level setting. Adding ink alone does not update the displayed estimate.
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Epson EcoTank ET-2950
Set the estimated ink levels on an Epson ET-2950 or ET-2959
Match the printer’s ink estimate to the visible tank levels with Set Ink Level. Use the separate full reset only after the corresponding tank has been refilled.
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Epson EcoTank ET-2950
Epson ET-2950 sublimation setup explained
Use sublimation ink at the first fill of a new EcoTank: follow Professor Printer’s explanation of the initial charging stage, matching tanks and careful bottle handling.
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Epson Expression Home XP-2205
Epson XP-2205 cartridge not recognized: checks to make
Check the exact cartridge message, regional compatibility, tape and seating before replacing more parts or changing settings.
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Epson Expression Home XP-2205
Check Epson XP-2205 ink levels in Smart Panel
Open the selected XP-2205 in Epson Smart Panel and read its cartridge estimates. Use low-ink information for planning, without treating it as an exact quantity.
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Epson Expression Home XP-2205
Clean Epson XP-2205 print heads for missing lines or colours
Check the nozzles first, run a cleaning only when needed, and follow Epson’s limits before repeating or using Power Cleaning.
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Epson Expression Home XP-2205
Print and read an Epson XP-2205 nozzle check
Print the XP-2205 nozzle pattern using Power and Stop, then decide whether cleaning is needed from the missing lines.
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Epson Expression Home XP-2205
Replace Epson XP-2205 ink cartridges
Move the cartridge holder using the correct ink-light condition, fit the replacement securely and complete charging before printing.
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HP Color LaserJet Pro MFP 3301fdw
Check estimated toner levels on the HP Color LaserJet Pro MFP 3301fdw or 3302fdw
Open Supplies → Cartridges on the touchscreen or view the selected printer in the HP app. Use the estimates for planning rather than treating them as exact measurements.
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HP Color LaserJet Pro MFP 3301fdw
Replace toner in HP LaserJet Pro 3301fdw or 3302fdw
Open the toner drawer, match the replacement to its colour slot and close the drawer and access door before checking the printer.
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HP DeskJet 2600 series
Check estimated ink levels on an HP DeskJet 2600
Read the DeskJet 2600’s ink indicators, print its status report or view estimated levels in the connected HP app.
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HP DeskJet 2600 series
Find the correct ink number for an HP DeskJet 2600
Use the printer’s own supply label and HP’s regional information before buying a cartridge; a matching shape is not enough.
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HP DeskJet 2600 series
HP DeskJet 2600 blank pages: manually clean and soak the cartridges
Follow the source video’s three-stage cartridge clean: cotton bud, damp-paper dabbing and a shallow soak, followed by drying, reinstallation and a test print.
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HP DeskJet 2600 series
HP DeskJet 2600 not printing black or colour: clean through the HP app
Check missing black or colour on a DeskJet 2600, run the HP app’s cleaning tool, inspect the test page and decide when to stop.
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HP DeskJet 2600 series
Replace ink cartridges in an HP DeskJet 2600
Release the old DeskJet 2600 cartridge, install the correct regional replacement and complete the alignment requested after new ink.
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HP DeskJet 2920
Align HP DeskJet 2900 cartridges in the HP app
Print an alignment page, position it on the scanner and complete the app’s scan prompt to check blurred or misaligned output.
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HP DeskJet 2920
Check estimated ink levels on HP DeskJet 2900
Read the cartridge icons, HP app estimates and local supply-status page, while distinguishing low ink from a cartridge error.
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HP DeskJet 2920
HP DeskJet 2900 blank pages or missing ink: use cartridge cleaning
Check paper and ink status, run the HP app’s cleaning routine and inspect its test page before deciding whether a further cleaning is needed.
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HP DeskJet 2920
Find the right ink cartridge number for HP DeskJet 2900
Read the cartridge label inside a DeskJet 2920 or 2955 and check HP’s regional supply information before choosing a replacement.
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HP DeskJet 2920
HP DeskJet 2920 missing black or colour: manually clean the cartridge
Use Professor Printer’s DeskJet 2900-series manual method: remove the affected cartridge, dab its printhead, optionally soak the base, then dry and reinstall.
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HP DeskJet 2920
Replace ink cartridges in an HP DeskJet 2900
Install the correct regional cartridges in a DeskJet 2920 or 2955, check left and right positions, and complete the new-cartridge alignment.
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HP DeskJet 3755
Check estimated ink levels on the HP DeskJet 3755
Read the black and tri-colour indicators on the printer or open the supply display in the HP app, while treating every reading as an estimate.
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HP DeskJet 3755
Fix missing colours or streaks on an HP DeskJet 3755
Check ink, paper and job settings, then use the printer’s automatic cleaning tools and inspect the diagnostic page. Use alignment for crooked lines and stop when the output is acceptable.
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HP DeskJet 3755
Install or replace ink cartridges in an HP DeskJet 3755
Wait for the carriage to stop, release the old cartridge downward and install the correct replacement at a slight upward angle until it clicks. Check the printer and a completed page afterwards.
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HP DeskJet 4320
Check estimated ink levels on HP DeskJet 4320 or 4355
Read the colour and black level icons or view estimated supplies in the HP app. Use the estimates to plan, alongside the actual print quality and cartridge messages.
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HP DeskJet 4320
Resolve E0 and blinking ink icons on HP DeskJet 4320 or 4355
Identify the affected cartridge, check compatibility, tape and seating, then use HP’s E0 restart or replacement steps only if the error remains.
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HP DeskJet 4300 series
HP DeskJet 4300 series blank pages: manually clean the cartridges
Follow Professor Printer’s DeskJet 4300-series method: dab the cartridge printheads, optionally soak their bases, dry and reinstall, then check the printed result.
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HP DeskJet 4320
Choose and replace ink in HP DeskJet 4320 or 4355
Check the supply number for your printer’s region, replace the required cartridge with the carriage stopped, and complete the alignment if a new-cartridge page prints.
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HP ENVY 6010e
Replace ink cartridges in an HP ENVY 6010e
Open the cartridge access door, use the hinged cartridge latches and complete the new-cartridge alignment scan.
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HP ENVY 6100 series
Align the cartridges on an HP ENVY 6100e
Print the alignment sheet from the touchscreen, place it face down on the scanner glass and choose Scan to complete calibration.
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HP ENVY 6100 series
Check a missing or incompatible cartridge error on HP ENVY 6100e
Check the exact cartridge message, confirm the correct regional supply and reseat the cartridge without touching its nozzles or contacts.
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HP ENVY 6100 series
Check estimated ink levels on an HP ENVY 6100e
View the ENVY 6100e’s estimated ink on its touchscreen, in the HP app or on its local settings page without mistaking an estimate for a print-quality test.
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HP ENVY 6100 series
Fix poor or blank prints on HP ENVY 6100e
Check paper and ink, inspect a diagnostic report, then choose cartridge cleaning, alignment or smear cleaning for the actual print defect.
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HP black and tri-colour cartridges shown in the video
How to refill HP black and colour ink cartridges
Follow Professor Printer’s syringe-refill method: peel back the labels, add ink slowly to the demonstrated black and colour ports, then replace the labels.
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HP OfficeJet Pro 8124e
Check a missing or unrecognized cartridge on an HP OfficeJet Pro 8124e
Identify the exact cartridge message, check the correct regional supply and reseat the indicated cartridge without touching its contacts.
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HP OfficeJet Pro 8124e
Check ink levels and printhead status on an HP OfficeJet Pro 8124e
Use Supplies on the touchscreen to inspect estimated cartridge levels and the separate printhead status. The HP app also shows supply estimates.
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HP OfficeJet Pro 8124e
Replace ink cartridges in an HP OfficeJet Pro 8124e or 8135e
Open the cartridge access door, release the old cartridge and seat its replacement in the matching color slot. Check the cartridge number for your region first.
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HP Smart Tank 5107
HP Smart Tank 5107 not printing black: manual printhead cleaning
Follow Professor Printer’s manual black-printhead cleaning method for the HP Smart Tank 5107, including access, dabbing, optional soaking and refitting.
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HP Smart Tank 5107
HP Smart Tank 5107 not printing colour: clean the colour printhead
Professor Printer’s HP Smart Tank 5107 colour-printhead cleaning method: remove the head, dab its ink outlet, check the colour marks and refit it.
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HP Smart Tank 5107
Choose the correct ink and refill an HP Smart Tank 5107
Check the bottle numbers on your own printer, match each ink colour and refill without squeezing the bottle or tilting the printer.
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HP Smart Tank 5107
HP Smart Tank 5107: the video’s method for removing tank ink
Professor Printer explains draining an HP Smart Tank 5107 back into an ink bottle by inversion, including preparation and spill precautions. Drainage is not filmed.
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HP Smart Tank 5107
How to remove and refit HP Smart Tank 5107 printheads
Follow Professor Printer’s HP Smart Tank 5107 printhead access and replacement method, including release, orientation, refitting and clearing the access error.
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