Printer troubleshooting technician providing live chat help

Joe B.

Reviewed for technical accuracy

Specialities: Sharp MFPs (AR/MX/BP series), scanner carriage/mirror unit, home position sensors, SCU PWB, SIM diagnostics

Sharp L1-10 / L1-00 scanner home position error — mirror carriage stuck, home sensor/flag, timing belt, SCU PWB, SIM 1-1 test

Technician avatar Technician
We’ll clear the L1-10 (scanner home position) fault. Quick triage first:
• Model (e.g., AR-5618, MX-M264N, AR-6020, BP series)?
• Does the scanner carriage/mirror unit move when powering on, or do you hear a brief motor whine then stop?
• Flatbed only, or does the ADF throw the error too? Any recent move/transport or cleaning?
Customer
MX-M264N. After a relocation, it boots, the scanner bar twitches, then L1-10. Copies and scans blocked.
Technician avatar Technician
On Sharp MFPs, L1 family codes (L1-10 / L1-00) mean the scanner didn’t reach the home position sensor in time. Typical causes: the transport lock left engaged, sticky rails/grease, loose timing belt, broken/dirty home sensor or flag, or an electrical issue in the SCU/Scanner PWB. We’ll start with safe user-level fixes; if needed we’ll run SIM 1-1 to test the carriage.
Customer
I didn’t touch any locks. What’s first?
Technician avatar Technician
Step 1 — Unlock & power cycle
1) Power OFF at the main switch, wait 30 sec.
2) Open the flatbed cover. Check for a scanner transport lock (dial/slider) under the platen/front right area (varies by model). Make sure it’s set to UNLOCK.
3) Gently move the scanner carriage 2–3 cm by hand; it should glide freely.
4) Power ON and watch: the bar should move to the white strip and return. If it stalls again, continue below.
Customer
The lock was half-turned. Unlocked it, but L1-10 still appears.
Technician avatar Technician
Step 2 — Clean/inspect the motion path
• Rails & bushings: Wipe the two scanner rails with a lint-free cloth. If sticky, lightly clean with IPA, then apply a very thin film of silicone grease.
• Timing belt & pulley: Check belt tension/teeth near the motor side; re-seat if it’s riding off.
• White reference strip: Clean the narrow white strip at the home end of the glass; dirt here can confuse shading/home detection.
• Home sensor & flag: Locate the small optical sensor and the black plastic flag on the carriage. Dust them; make sure the flag isn’t bent/broken.
Customer
Cleaned the rails and strip. Carriage now moves further, then stops and throws the error again.
Technician avatar Technician
Step 3 — Run scanner tests (service mode)
• Enter SIM 1-1 (scanner operation check). The carriage should sweep and return to home smoothly. If it fails, we likely have a home sensor or motor drive issue.
• Run shading/calibration (model-specific SIM; often 46-01 or similar) after cleaning the white strip.
• If SIM 1-1 passes but normal copy fails, check ADF ribbon/cable seating and lid switch alignment.
Customer
SIM 1-1 hangs mid-travel. Any other user steps before parts?
Technician avatar Technician
Step 4 — Harness & board checks
• Power off; reseat the scanner motor and home sensor connectors at the SCU/Scanner PWB and on the carriage.
• Inspect the flat flex cable for kinks/tears after the move.
• If the home sensor is cracked or its flag loose, replace the sensor/flag assembly. Persistent L1 usually points to scanner unit, home sensor, motor, or SCU board per service documentation.
Customer
After reseating the cables and cleaning again, SIM 1-1 completes and copies work. Anything to prevent the error returning?
Technician avatar Technician
Keep L1 away
• Lock carriage before transport; unlock on arrival.
• Quarterly: dust rails, belt path, and the home sensor; wipe the white reference strip.
• Avoid heavy cleaners on the glass; use IPA on lint-free cloth.
• If L1 reappears intermittently, plan for a timing belt and carriage bushing service, and check firmware updates.
Customer
I see a lot of references to L1-00 online. Is that different from L1-10?
Technician avatar Technician
They’re the same L1 family. Manuals commonly document L1-00 as scanner feed/home position trouble (carriage didn’t return home in time). Variants like L1-10 point to the same path: mirror unit/carriage, home position sensor, scanner motor, belt, harness, or the SCU PWB. The fixes above apply to AR/MX/BP models alike.
Customer
Got it — it’s working now. Thanks!
Technician avatar Technician
Summary: Sharp L1-10 / L1-00 means the scanner carriage didn’t hit its home sensor. Unlock the transport lock, clean rails/belt/white strip, check the home sensor & flag, then run SIM 1-1. If the test fails, inspect harness, motor, and SCU PWB. Want step-by-step help for your exact model? Open the chat.

Quick answer: the accepted fix

Accepted fix for Sharp L1-10: ensure the scanner transport lock is unlocked, clean and lightly lube the rails, clean the white reference strip, check the timing belt, and clean/align the home position sensor & flag. Run SIM 1-1 to verify carriage travel; reseat harnesses or service the scanner unit/SCU PWB if it still fails.

What triggers L1-10 (home position) — mirror unit, sensor, motor

L1-10 / L1-00 is a scanner feed/home position fault. The carriage must return to the home sensor after power-on. If the mirror unit sticks on dirty rails, the timing belt slips, or the home sensor can’t see its flag, the controller times out and raises L1. Electrical causes include a failing scanner motor or SCU (scanner control) PWB. A quick SIM 1-1 run confirms whether motion and homing are normal.

How to verify the fix

Power on and watch the carriage return to the home edge, pause on the white reference strip, then park. Run a flatbed copy and an ADF scan. If both succeed without L1-10, the home sensor path is restored. If the code recurs, move to harness checks and, if needed, scanner motor/home sensor replacement.

L1-10 — quick troubleshooting tips

Most L1 cases resolve with an unlock/clean/test routine.

Quick path: Unlock transport → clean rails, belt, white strip → check home sensor & flag → run SIM 1-1 → reseat harness at SCU PWB. For AR/MX/BP models, persistent L1 usually implicates the scanner unit, sensor, motor, or SCU board — all standard service items.

Disclaimer: This information is AI-generated and intended for general guidance only. For advice specific to your environment, please consult a verified expert on Whizz-Tech before making decisions.

Getting Started Is Easy

Ask for help, 24/7

Members enjoy round-the-clock access to 12,000+ verified Experts, including tech support, mechanics, vets, and more.

Expert will respond in minutes

We match you with an Expert who specializes in your situation. Talk, text, or chat — whichever you prefer.

Save time & money

No scheduling hassles or expensive consults. Membership can save you significant time and money each month.

FAQ

What does Sharp L1-10 / L1-00 actually mean?

It’s a scanner home position fault: the carriage didn’t reach the home sensor within the allowed time. Causes include sticky rails, loose belt, dirty/bent sensor flag, bad home sensor, or a scanner motor/SCU PWB issue.

How do I clear L1 after moving the machine?

Set the transport lock to UNLOCK, power-cycle, clean the white reference strip and rails, then run SIM 1-1. If the carriage still fails, reseat harnesses and inspect the home sensor and belt.

Is L1-10 different from L1-00?

They are variants in the L1 group for scanner feed/home trouble across AR/MX/BP models. Service guidance is the same: check carriage motion, belt, home position sensor, motor, and the SCU board; verify with SIM 1-1.

Sources

Matt Verified Icon
Matt ● replies in < 1 min
Technician Expert
⭐⭐⭐⭐⭐ Trusted by 27,000+ customers
Avatar
Alex · Expert's Assistant
5 Tech Support Specialists are online right now.