Service History — Arlington, TX

Problem: Zebra ZT410 thermal printer due for sixth scheduled preventive maintenance service at a DeSoto, TX facility.

Solution: Completed PM6 service on the Zebra ZT410. Replaced the 203 DPI printhead (P1058930-009), platen roller (P1058930-080), toggle, ribbon sensor, and media sensor. All components were tested post-installation.

Problem: Zebra ZT410 thermal printer presented with a slipping drive system — gears failing on the main motor, requiring inspection of the full drive assembly and platen roller.

Solution: Technician vacuumed and cleaned the internal cavity, then replaced the drive gears (P1058930-039), drive motor (P1058930-040), and platen roller (P1058930-080) with Zebra OEM components. The belt showed a torn section with missing teeth but remained functional; drive system was restored and tested c

Problem: Zebra ZT510 industrial thermal printer was due for a scheduled preventive maintenance visit (session 4 of 6 in an ongoing PM cycle).

Solution: Technician performed scheduled preventive maintenance on the Zebra ZT510, including full cleaning of internal components and functional testing to confirm proper operation.

Problem: HP LaserJet MFP M521dn reported needing a full maintenance kit, with heavily worn Tray 1 pickup and separation rollers and ADF pickup rollers and separation pad due to high-volume use of both paper paths.

Solution: Installed a complete maintenance kit, then followed up with replacement of the Tray 1 pickup roller, Tray 1 separation pad, and ADF maintenance kit components. Cleaned and tested the printer after all parts were installed.

Problem: Zebra ZT230 thermal printer producing a persistent vertical black line on the far left edge of printed barcodes, outside the intended label image area.

Solution: Technician investigated a vertical black line appearing on the far-left margin of barcode labels. After on-site evaluation, the defect was traced to the label printing software rather than a hardware component. No parts were replaced; the case was monitored and closed after the issue did not recur.

Problem: Lexmark T640 laser printer presented with print quality issues including drag marks and indentations, attributed to a failing fuser unit and worn feed rollers.

Solution: Cleaned internal components and rollers of dust accumulation. Replaced worn feed rollers (part 99A0070) and fuser assembly (part 40X2592) from stock. Printer tested and confirmed operational post-repair.

Problem: Brother MFC-L3770CDW (page count: 4,831) presented with faded color output and failed paper pickup from the lower tray.

Solution: Technician cleaned internal components and confirmed the media feed issue resolved. Faded output traced to non-OEM compatible toner cartridges and drum units. Customer swapped all toner cartridges and drum units from a same-model unit in the office running OEM supplies; image quality returned to acc

Problem: Zebra QLN420 mobile thermal printer reported inadequate media grip and feed issues traced to a worn platen roller requiring replacement.

Solution: Technician replaced the platen roller assembly using kit P1050667-008 (QLn420 Platen/Gear with Holder, Linered) and confirmed proper grip and print registration through post-repair testing.

Problem: Zebra 140xi4 thermal printer required ribbon strip plate replacement — part of a multi-unit service continuation addressing recurring label creasing every 20th label.

Solution: Replaced ribbon strip plate and static brush on the Zebra 140xi4, mirroring the repair performed on a companion unit. Multiple mechanical tweaks and adjustments were attempted to fully eliminate the 20-label creasing interval; issue was partially mitigated and escalated for further follow-up.

Problem: HP LaserJet M402n tray 2 cassette would not fully extend or remove from the printer.

Solution: Inspection revealed a broken tray 2 paper cassette guide assembly on the lower right side of the unit. The damaged guide prevented the internal metal lift plate from lowering, blocking cassette removal. The faulty guide assembly was replaced to restore full tray operation.

Problem: Lewisville, TX customer required a new Lexmark MS821dn laser printer configured with three additional paper trays.

Solution: Delivered and installed a new Lexmark MS821dn with three supplemental trays. Unit was tested prior to delivery; an existing Lexmark T654 was disposed of and removed from service.

Problem: Zebra ZT510 industrial thermal printer due for quarterly preventive maintenance as part of a scheduled five-unit PM cycle at a Grapevine facility.

Solution: Performed quarterly PM on the ZT510. Inspection revealed a curved platen roller requiring replacement. Installed OEM platen roller (P1083347-012), tested print quality, and confirmed the unit was ready for return to service.

Problem: Zebra 105SL Plus thermal printer producing barcodes with visible horizontal lines, indicating a failing or contaminated printhead.

Solution: Replaced the printhead using a unit from the customer's own stock, cleaned the print path, and tested output to confirm clean, line-free barcode printing.

Problem: HP Color LaserJet M577 displayed a 49.38.07 firmware error, traced to a hung remote print job halting normal operation.

Solution: Performed a partial system clean and cleared the stalled remote print job from the queue. Unit was tested and returned to normal operation.

Problem: Zebra GX430t thermal printer due for scheduled preventive maintenance (service interval 5 of 7).

Solution: Performed preventive maintenance on Zebra GX430t at 551,285 inches of print history. Cleaned internal components and verified printer configuration.

Problem: Zebra ZT410 reported with label guide misalignment and significant vertical lines appearing across print output.

Solution: Replaced the printhead, which showed heavy vertical line defects. Repositioned the media sensor from the far-left position to center. Label guides inspected and adjusted to the installed media roll; no structural guide defect found. Unit tested and confirmed operational.

Problem: Zebra 105SL thermal printer reported sensor and printhead issues affecting print quality and reliability.

Solution: Technician cleaned the printhead and adjusted printhead pressure. Printer was tested and confirmed operating within normal parameters. No parts required.

Problem: Kennedale, TX customer required a replacement for a Lexmark MS810 laser printer that had reached end of service.

Solution: A new Lexmark MS821dn was sourced as a direct replacement for the MS810 and shipped to the customer's location.

Problem: Lexmark T650 laser printer reported with toner spill and recurring paper jams.

Solution: Service call for toner spill and jamming on Lexmark T650 was cancelled before repair work was performed.

Problem: Brother MFC-L8900CDW presented a persistent jam error code that could not be cleared. The fuser sensor flag was found broken, and two toner cartridges were leaking.

Solution: Replaced the fuser cover assembly (LY7727002) and reseated the fuser plate, which had been causing corner folds on output. Toner leaks were noted but not actively causing issues at time of repair.

Problem: Zebra ZM400 thermal printer in Carrollton, TX was due for scheduled preventive maintenance and submitted for a full PM service.

Solution: Performed PM service on the ZM400: cleared dust buildup, cleaned the platen roller, inspected the printhead, and tested the unit to confirm proper operation.

Problem: Zebra 105SL Plus reported two label-feeding issues affecting consistent print output.

Solution: Technician adjusted the tear bar position closer to the platen roller and repositioned the media sensor to allow labels to pass through correctly.

Problem: Customer requested a spare parts quote for a Zebra ZM600 thermal printer to replenish two printheads that had been used from their on-site stock.

Solution: Quoted two 79804M 300 DPI 6" printheads and two 79867M 300 DPI belts for the Zebra ZM600. Parts were to ship directly to the customer site if ordered.

Problem: Zebra 105SL thermal printer presented for scheduled PM31 preventive maintenance service in Duncanville, TX.

Solution: Replaced drive belt and platen roller. Adjusted sensor settings and tested unit to confirm proper operation.

Problem: Zebra ZT230 thermal printer in Duncanville reported unable to print.

Solution: Inspection found no mechanical faults. Technician loosened the toggle grip and increased the darkness setting. Test-printed labels confirmed all barcodes scanned correctly.

Problem: Zebra 105SL thermal printer throwing intermittent ribbon-out errors despite ribbon being properly loaded.

Solution: Technician diagnosed excessive printhead pressure creating drag on the ribbon path. Pressure and darkness settings were adjusted to manufacturer spec, eliminating the false ribbon-out fault.

Problem: Zebra 105SL Plus thermal printer reported a head close sensor fault, preventing normal print operation.

Solution: Diagnosed a misaligned flag on the head close spindle. Added a washer to the spindle to reposition the flag within the sensor's detection range. Tested and confirmed proper sensor engagement and print function.

Problem: Zebra ZT510 thermal printer in Hurst, TX was due for preventive maintenance (PM22 service level).

Solution: Technician performed a PM22 preventive maintenance cleaning on the Zebra ZT510 and tested the unit to confirm proper operation.

Problem: HP LaserJet M607 producing light or missing print across the center of the page — persisted across multiple toner cartridges.

Solution: Inspected fuser, transfer roll, and laser lens. Found toner dust on the center of the laser lens; cleaned it. Print quality restored across configuration, supplies status, and usage pages. Feed rolls confirmed in good condition.

Problem: Zebra QLN420 mobile printer reported with unresponsive up/down navigation buttons and media slippage during printing.

Solution: Technician disassembled the QLN420, identified a worn platen roller and faulty removable platen gear as the cause of media slippage. Replaced the platen roller assembly (P1050667-008) and confirmed proper media feed on test. Unresponsive up/down buttons were also diagnosed; lid locking mechanism and

Problem: HP LaserJet P4515 in Duncanville, TX reported recurring paper jams disrupting normal operation.

Solution: Replaced one pickup roller and two feed rollers. Cleaned internal paper path components and tested printer to confirm reliable feed at page count 4,698.

Problem: HP LaserJet M601 reported toner smearing and poor adhesion — printed output showed unfused toner smudging across the page.

Solution: Installed a fuser maintenance kit on the HP LaserJet M601, cleaned internal components, and reset the maintenance counter. Test prints and live customer jobs confirmed proper toner fusing after the repair.

Problem: HP LaserJet M602n intermittently printing with unfused toner, producing smeared output. The fault cycled — printing cleanly for roughly a week before recurring — and had persisted for several months.

Solution: Reviewed print samples confirming intermittent fuser adhesion failure. Fuser had been previously replaced with no resolution. Per manufacturer technical support guidance, the high-voltage power supply was identified as the next recommended replacement to address the recurring unfused-toner condition

Problem: Lexmark MS810 laser printer presented with a flickering display and approximately half the screen blank, accompanied by delayed print output.

Solution: Technician replaced the power supply (part 40X7694) based on diagnosis of screen flicker; when the issue persisted after the initial swap, additional components were installed. Unable to restore normal operation, the unit was stripped for parts to support other printers in service.

Problem: HP LaserJet 4350dtn producing wide black bands across printed pages.

Solution: Identified a defective toner cartridge as the source of the banding. Replaced the cartridge using stock on hand. All feed rollers retained proper grip, and the maintenance kit showed only 30K pages of use with no jam errors present.

Problem: Zebra ZT410 industrial thermal printer due for scheduled preventive maintenance, second of a two-visit PM cycle.

Solution: Cleared accumulated paper dust from the unit. Confirmed size-sensing calibration functioned correctly for both 2×4 and 4×8 label formats the customer planned to run. Inspected internal gears and belt; no wear detected.

Problem: HP LaserJet MFP M633 reported producing a loud squealing noise during operation.

Solution: Technician isolated the source, ruling out toner and tray 2 rollers, then cleaned the machine. Inspection confirmed the fuser assembly required a maintenance kit (J8J87-67901); the customer had the kit on-site and arranged for in-house installation.

Problem: HP LaserJet M630 ADF jamming on every scan attempt, preventing documents from feeding through the automatic document feeder.

Solution: Technician located and removed a stuck staple from the ADF paper pathway. ADF feed and scan functions were tested and confirmed operational after the obstruction was cleared.

Problem: Zebra 110Xi4 thermal printer reported a calibration failure — the unit was configured for continuous media but loaded with non-continuous labels, preventing proper calibration.

Solution: Technician changed the media setting from continuous to non-continuous, cleared stuck labels from the print path, then cleaned and tested the printer to confirm calibration and proper label detection.

Problem: HP LaserJet M426fdw reported a roller issue affecting paper handling.

Solution: Identified and replaced a worn feed roller on the HP LaserJet M426fdw. Unit was cleaned and test-printed to confirm proper paper feed operation.

Problem: HP LaserJet P4515 reported recurring paper jams affecting normal operation.

Solution: Fuser assembly diagnosed as the root cause. Fuser replaced and printer tested to confirm proper paper handling and jam-free operation.

Problem: Zebra 110xi3 thermal printer producing blank labels — ribbon guide component above the printhead missing or damaged, preventing proper ribbon tracking.

Solution: Technician confirmed the ribbon guide assembly above the printhead was the root cause of blank output. Required parts were unavailable through standard vendor channels; sourcing alternatives pursued before repair can proceed. Call closed pending part availability.

Problem: HP LaserJet M880 MFP reported recurring paper jams with crinkling paper; customer noted the ADF had been making grinding noises prior to the jamming issue.

Solution: Inspection of the ADF feed path revealed two warped and cracked components — a metal rod and a hinged plastic drop-down piece spanning left to right — causing paper to catch at the center and front edge. No foreign obstruction (clip or staple) was present; prior grinding noise likely caused the dama

Problem: HP LaserJet M403 reported recurring paper jams.

Solution: Replaced defective toner cartridge from customer-supplied stock. Cleaned feed and separation rollers. Tested printer to confirm jam-free operation.

Problem: Zebra 105SL thermal printer reported in need of service; take-up motor identified as failed.

Solution: Technician replaced the take-up motor on the Zebra 105SL, then cleaned the unit and verified full operation through functional testing.

Problem: Zebra 140xiIII Plus reported producing light, faint print output on a Grand Prairie, TX site visit.

Solution: Inspection revealed multiple cuts on the platen roller and horizontal lines in the print image traced to the printhead. Recommended replacement of the 203 DPI printhead (G48000M) and platen roller (G40038M); customer did not respond to follow-up and call was closed.

Problem: Zebra S4M thermal printer not printing.

Solution: Technician reconfigured media settings to thermal transfer, set sensor to transmissive mode, cleaned the printhead, and verified print output.

Problem: Lexmark XM3150h MFP reported scanner malfunction; on-site assessment revealed the ADF was not feeding documents properly, with significant roller wear throughout the feed path.

Solution: Cleaned ADF rollers to restore immediate feed function, then replaced ADF separation roller (40X9108), ADF pick roller assembly (40X8736), tray 1 pick tires (40X8297), and tray 1 separation roller assembly (40X8444). All components installed and tested.

Problem: HP LaserJet MFP M527 reported intermittent grinding noises; a previous call had identified flat-spotted rollers, but this visit could not reproduce the same symptom.

Solution: Technician inspected the M527 and found no flat spot on the roller as noted in the prior call. A tray 2 lift error was present but cleared after a firmware update. Users provided a sound recording of the noise, but the source component could not be identified without a live occurrence. No parts repl

Problem: HP Color LaserJet CM4730 MFP would not scan. The unit had never been configured for scan-to-email and a previous technician from another company had incorrectly indicated a hardware part was needed.

Solution: Determined the issue was a configuration gap rather than a hardware fault. Confirmed the device requires SMTP (not POP3) and that scan-to-folder was not viable without a legacy Windows Server/XP environment. Advised the customer that Gmail's SMTP port settings had changed and that correcting those c