Semiconductors: Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026

how to investigate dose deviation alarm on a Canon FPA-6300ES6a stepper

Q: How long does how to investigate dose deviation alarm on a canon fpa-6300es6a stepper typically take on Semiconductors — Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay) — 2026?

For most Semiconductors — Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay) — 2026 cells, 5 to 30 minutes including verification. Large fleet retrofits, anything touching maintenance-token rotation or safety-PLC cutover, or cross-cell parameter migrations can stretch to half a shift because you have to wait for production-window clearance, OEM re-licensing, or coordinated maintenance windows.

Q: Is there a rollback path?

Yes for most Semiconductors — Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay) — 2026 changes. Snapshot the firmware revision, photograph the parameter set, export the alarm history, and write down the maintenance token before any change. A few operations are one-way (cleared fault history past the OEM retention window, irreversible safety-PLC fuse, permanently revoked teach pendants). Check the in-controller maintenance help for the specific operation before you commit.

Q: Will this affect other cells in the Semiconductors — Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay) — 2026 fleet?

Often yes. Semiconductors — Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay) — 2026 fleets share safety-PLC policies, OEM service-contract quotas, operator rosters, and fieldbus permissions across the whole plant (one maintenance-token grant holds permissions for many cells, one safety-PLC policy covers all stations, one service-contract tier covers all members). Use the Semiconductors — Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay) — 2026 OEM alarm history and the fieldbus drop list to enumerate dependencies before changing a shared component.

By Sai Kiran Pandrala · Last verified: 2026-06-01 · Source: controls-community forums (r/PLC, r/Robotics, r/CNC, r/Fanuc, r/KUKA, r/Cognex, r/labview), OEM service bulletins and changelogs, OEM service manuals, in-controller diagnostic help

At a glance

Controller	Semiconductors. Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026
Category	Industrial Error Codes
Guide type	Procedure
Skill level	Beginner to intermediate field service tech
Time	5 - 30 minutes including verification

Field service techs and maintenance engineers running Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 hit how to investigate dose deviation alarm on a Canon FPA-6300ES6a stepper often enough that there is a stable recovery pattern. The steps below match how an experienced day-to-day operator would run it during a real callout, not a hypothetical training-class lab. My standard pattern for this callout is documented below end to end.

What how to investigate dose deviation alarm on a canon fpa-6300es6a stepper actually involves on Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026

On Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 on a fresh callout the tools I crack open first are Nikon NSR maintenance console (Stage / RS alarm pages), KLA SensArray wireless wafer for dose/focus map verification, Onto Innovation NovaMARS overlay analysis. Each of these surfaces a different layer of the fault - keep at least the first one in your fault-history notebook so the next time this happens you do not start cold.

For verification on Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026, the methods that survive contact with a real second-shift production workload are compare CD-SEM measured CD against scanner dose-mapper control point and confirm reticle pod presence via inner pod handler (IPH) sensor state in eDiagnostics. Anything less than that and you are shipping on vibes.

Authoritative sources for Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 that I cross-reference before committing to a fix: canon.com/lithography, asml.com/support, ontoinnovation.com. OEM marketing brochures and trade-press writeups are signal, not ground truth.

The rest of this page is the structured fix path. Start with diagnose, then remediation, then the automation options so you do not have to do this by hand the next time it surfaces. Verify and safety sections at the end are the discipline that keeps the fix from regressing the next time you open the cabinet.

Diagnose first, fix second

Eighth: diff the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 setup against its last known good state. Ask the obvious question - what changed in the 72 hours before the fault started? Did the controller take a firmware update overnight (check the About panel for the firmware revision vs the previous version you wrote down in your notes)? Did you swap a drive, a motor, an encoder cable, or a fieldbus drop? Did you change a tool offset, a work offset, a vision job, or a recipe? Did the maintenance team push a new PM checklist, swap a lube reservoir, or change a coolant concentration? Use the in-controller audit trail (Fanuc PARAM history, KUKA KRC log, Cognex In-Sight job version) to anchor "before vs after" so you are not guessing. Cross-check the OEM service bulletin and the OEM community forum for the exact firmware revision - if a regression hit a batch of cells in the same week, the community catches it before the official bulletin admits it. Record the suspect ranking, then disprove suspects one at a time with the cheapest test first (parameter restore before drive swap, encoder battery check before encoder swap).

Start by capturing the exact failure signal in writing before you change a single thing on your Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 setup. On the controller HMI that is the alarm code, the alarm message text, the timestamp, the controller hour-meter, and the part-count when the alarm hit. On the OEM diagnostic interface that is the fault-history dump (Fanuc alarm history, KUKA KSS log, Cognex In-Sight event log) plus the running program block number at the moment of fault. Photograph the HMI screen with the alarm panel open. Do not paraphrase. Most OEM service workflows will not even route the warranty case without the controller serial number, the alarm history dump, and the fault timestamp - the field service engineer pastes the alarm code straight into the OEM diagnostic tool and the first response is "we see the fault, here is what the controller logged."

Second pass: open the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 controller diagnostic panel and read the alarm history or fault stack for the failing window. Most modern industrial controllers surface a fault trail (the controller alarm history, the OEM diagnostic interface, the fab MES event log, the cell controller PLC fault table). The alarm history tells you whether the fault was a real condition, a teammate changing a parameter or DI mapping in the same minute, or an OEM-side firmware quirk. Many SRVO or AXIS faults trace to a parameter-level change pushed in the same engineering session in the previous hour - the fault trail makes that obvious without guesswork.

Field notes from real Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 callouts

The verification step I never skip on Semiconductors work is `run ASML TIS calibration and verify TIS-A vs TIS-B sensor agreement within nm spec`; the HMI will happily show "Normal" while the field device is still latched in fault. In Semiconductors work the cost of guessing is measured in scrap and downtime, so I read the Semiconductors release notes before I touch a setpoint, every time, no exceptions.

For Semiconductors jobs I keep a battered field notebook of "what bit me on Semiconductors and how I cleared it", writing it down the first time has saved me a dozen overnight returns. After every Semiconductors repair I run `compare CD-SEM measured CD against scanner dose-mapper control point` to confirm the loop actually held, it takes thirty seconds and has saved me at least one callback per month.

Tools I actually reach for

For most Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 faults I start with Onto Innovation NovaMARS overlay analysis, fall back to Cymer EUV source diagnostic UI for IF power and droplet metrics, ASML BaseLiner overlay control and matched-machine reporting when Onto Innovation NovaMARS overlay analysis cannot surface the answer, and keep ASML TIS/ILIAS sensor self-check screen handy for the cases where neither answers. That ordering is not academic - it matches the layers of the fault as they tend to surface, so the cheapest signal lands first and the heavier tooling only comes out when the simpler answer does not hold up. My muscle-memory shortcut for this is to run the first tool while the alarm screen is still open, not after I have already cycled controller power.

Verification I run before I call it fixed

Before I mark a Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 fault resolved, the verification loop below is what I actually run. Each step proves a different layer is green, and the order matters - the cheaper checks gate the more expensive ones.

confirm reticle pod presence via inner pod handler (IPH) sensor state in eDiagnostics

If that one comes back clean, move to the next check. If it does not, stop and dig in there before layering more verification on top of a red signal.

check stage servo error trace during exposure scan via APV waveform view

If that one comes back clean, move to the next check. If it does not, stop and dig in there before layering more verification on top of a red signal.

run ASML TIS calibration and verify TIS-A vs TIS-B sensor agreement within nm spec

If that one comes back clean, move to the next check. If it does not, stop and dig in there before layering more verification on top of a red signal.

verify EUV source IF power log trend over last 24 hours via Cymer UI

Only when every line above runs clean do I close the loop and update my fault-history notebook with the timestamps.

Where I check first when the docs disagree

When two sources contradict each other on a Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 detail, the disambiguation order I lean on is stable. I usually check ontoinnovation.com for the ground-truth view on this part of Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026. I usually check semi.org/standards for the ground-truth view on this part of Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026. I usually check nikon.com/business/semi for the ground-truth view on this part of Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026. OEM marketing brochures and trade-press writeups are signal, not ground truth, and I treat them as such until the references above either confirm or contradict the claim.

Solution-focused remediation path

Before any destructive step on a Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 cell, slow down and stage rollback. Snapshot the current firmware revision, the current parameter set (PARAM PUNCH OUT, KUKA archive, Cognex job export), the current ladder and HMI screens, the current I/O mapping, and the current member-roster of teach pendants registered to the cell to a notes entry first. Capture the failing photo, the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 alarm history dump, and the timestamp window. Photograph the cell from two angles: the controller HMI showing the alarm, and the cabinet showing the drive status LEDs. Then do the destructive step (clear a parameter, swap a drive, remove a teach pendant, restore a backup) inside a maintenance mode or a sister cell first, never the production cell directly. Capture the firmware revision, the safety-PLC permissions, the connected-pendant list, the cell operator roster, and the relevant fieldbus log snapshot to your notes before the destructive step. Decision point: if the cell is under an OEM service contract, the cheapest correct path is almost always to open the OEM hotline in parallel with the rollback - the OEM service engineer can confirm whether an OEM-side firmware push is responsible while you are still staging the change, which avoids a needless parameter edit if the fix is in the next firmware revision.

When the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 controller returns intermittent alarms, cycle delays, or "something went wrong" under normal load, suspect the OEM firmware or a wiring intermittent before blaming the cell. Subscribe to the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 OEM service bulletin RSS or hotline notification so an open bulletin lights up your inbox or Teams automatically. Cross-check the OEM Trust Center or maintenance portal for any planned firmware push covering your machine series. Listen to the OEM controls-community forum and r/semiconductors - many regressions land there 15 to 30 minutes before the formal bulletin update. Decision point: if no bulletin is open but multiple teammates in the same plant are seeing the same alarm, fail over to a sister cell (if a sister machine exists) or to a backup parameter set (if the saved archive is current) and file an OEM service ticket with the alarm history dump, the controller serial number, and the timestamp window; major OEMs all accept the controller serial number as the primary trace key. Photograph the faulting cell with the HMI and the firmware version visible before the failover - that photo is what the OEM field service engineer asks for first on any alarm or cycle-time complaint.

Start by sorting the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 fault into one of three buckets, because roughly 80% of cases fall here. Bucket one is electrical / drive: instantaneous overcurrent, sustained overload, drive overheat, bus undervoltage, or a phase-loss event. Bucket two is mechanical / motion: encoder battery low, absolute position lost, over-travel, hardstop hit, or a vibrated-loose cable. Bucket three is recipe / parameter / I/O: the program calls a tool that is not loaded, the work offset is wrong, a DI is mapped to a disconnected sensor, or a vision job version has drifted. Pick the bucket first, then act. Before you act, capture a baseline photo of the alarm screen plus the controller hour-meter so you can prove whether the fix actually moved the needle. Decision point: if the alarm is intermittent and the cell is under an OEM service contract, open the OEM hotline first - OEM phone support beats hours of speculative debugging on cost and on liability if the alarm recurs and trips a safety-related shutdown.

Automate this fix so you do not do it twice

Fleet maintenance-license + OEM token rotation via OEM admin

Rotating a maintenance access token on one Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 controller by hand is fine; rotating across a fleet of cells is how you end up with twelve different tokens, four expired ones, and an unknown blast radius across the plant. Drive rotation through the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 OEM admin SDK or REST under a service account with the rotation scope only, store the new token in a plant-wide password manager (1Password, Bitwarden, OEM secrets manager) with versioning enabled, and roll the consumer scripts one cell at a time with a health check between each. Pin the API version explicitly during rotation so a coincident OEM firmware push does not look like a rotation failure.

# Rotate the controller maintenance token (regenerate via the OEM utility, capture in 1Password)
op item create --vault Plant --category "API Credential" \ --title "semiconductors controller token 2026-06-01" \ password="$NEW_CONTROLLER_TOKEN" notes="Rotated $(date -Iseconds)"
# Capture the old token as deprecated so cutover is reversible
op item create --vault Plant --category "API Credential" \ --title "semiconductors controller token OLD 2026-06-01" \ password="$OLD_CONTROLLER_TOKEN" notes="Old token marked deprecated"

Multi-cell rate-limit + retry policy via shared client wrapper

When the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 integration runs across multiple cells or controller types, every consumer needs the same backoff, jitter, and idempotency behavior or one noisy cell will starve the rest of the MES poller. Wrap the OEM SDK or fetch call in a thin client that reads the rate-limit headers (X-RateLimit-Remaining, Retry-After, x-ratelimit-reset), applies full jitter (base 200ms, cap 30s, max 5 retries), and de-dupes writes by a stable key (the controller cycle id, the fieldbus drop external id, the destination MES record id). Emit simple log lines tagged with the cell id so a fieldbus burst on one cell shows up in the same log as the downstream cascade.

# Python - semiconductors controller API wrapper with full-jitter retry
from tenacity import retry, wait_random_exponential, stop_after_attempt, retry_if_exception_type
import requests class RateLimited(Exception): pass @retry( wait=wait_random_exponential(multiplier=0.2, max=30), stop=stop_after_attempt(5), retry=retry_if_exception_type(RateLimited),
)
def call_semiconductors(method, path, token, payload=None): r = requests.request(method, f"https://controller.plant.local{path}", headers={"Authorization": f"Bearer {token}"}, json=payload, timeout=10) if r.status_code == 429: raise RateLimited(r.headers.get("Retry-After")) r.raise_for_status() return r.json()

Monitor + alert via Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 OEM diagnostic reports, alarm history, and plant dashboard ingestion

For the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026, the most useful long-running telemetry is the OEM diagnostic reports + alarm history shipped to a plant dashboard (Grafana with a CSV source, Ignition with a tag history, the fab MES OEE per SEMI E10, a Notion database via the API) and graphed on a single view. Pair that with synthetic monitoring (a small script that triggers the failing cycle or runs the failing test sequence every 5 minutes from at least two cells) so a fleet-level regression lights up before teammates report it. Subscribe the on-call inbox or a private Teams channel to the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 OEM service bulletin (Atom/RSS or vendor portal webhook) plus the OEM service-status handle so an open bulletin self-correlates with the synthetic failures.

# Tiny synthetic monitor - hit the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 controller health endpoint every 5 minutes
while true; do curl -s -o /dev/null -w "%{http_code} %{time_total} $(date -Iseconds)\n" \ -H "Authorization: Bearer $TOKEN" \ https://controller.plant.local/api/v1/me \ >> /var/log/semiconductors-synth.log sleep 300
done

Common pitfalls and what to watch for

The deepest trap with Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 cells is treating a recurring class of alarm as a one-off incident. A drive overheat or a vision-trigger miss burst gets papered over with a power-cycle or a parameter reset, the cell runs for two weeks, and the exact same signature returns because the root cause was never identified. Codify every case in a fault-history notebook per machine, save the working firmware revision (the About panel) in the same note, and write the exact parameter set, I/O mapping, and fieldbus drop list into a checklist. After any major firmware update on Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 review the parameter set and the I/O mapping explicitly, since OEMs silently change defaults or add new safety interlocks between major releases.

The second half of this pitfall is confirming the fix on a single cell when the cell is part of a fleet. If you and three teammates run the same Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 controller on the same production line, an OEM-side firmware push tends to bite a whole batch within the same shift. Verify on every cell that runs the failing recipe, log the result and the firmware revision per attempt, and only then declare the class closed.

Verify the fix worked

Reproduce the original faulting cycle against Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 on the same cell AND a sister cell with the same recipe. If the alarm or fault code still surfaces on any cell, you have not fixed it.
Watch for 24 to 48 hours via the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 controller alarm history + the fieldbus log + your fault-history notebook. Cached fault states and stale fieldbus link state mask slow-burn drift and intermittent fieldbus issues.
Smoke-test under realistic load: replay the cycle against a test workpiece for at least 30 minutes at your normal production feedrate, log success / alarm and the timestamp per attempt to a notes file.
Capture the new state in a fault-history notebook entry so the next time this happens you do not rediscover it. Note firmware revision + parameter set + I/O mapping + failing photo + verbatim alarm string + fix applied. Push to a plant-wide maintenance wiki if your plant uses one.
If the fix involved a maintenance-token rotation or a parameter set change, commit the new token to your password manager and photograph the parameter dump for archival.

Safety, rollback, blast radius

Test in a Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 maintenance mode or on a sister cell first before any change that touches the production cell. Snapshot the firmware revision, the parameter set, the I/O mapping, and the safety-PLC permissions before changing anything.
Apply the principle of least surprise when granting teach-pendant access or safety-PLC permissions. Review the operator roster against the people who actually need access - extra teach pendants are extra blast radius.
Use idempotent cycles where the Semiconductors, Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 controller supports it (the OEM cycle-id de-dupe, external id keys on MES records) so a re-run cycle does not double-count parts or duplicate scrap records.
Know your rollback path. Firmware rollback is a one-line OEM utility load; a maintenance-token rotation is reversible if you kept the old token in the password manager during cutover; a parameter set change is reversible only if you saved the previous archive.
For cell-wide or plant-wide changes, line up a maintenance window with production scheduling before pushing through the OEM utility.

FAQ

How long does how to investigate dose deviation alarm on a canon fpa-6300es6a stepper typically take on Semiconductors: Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026?

For most Semiconductors. Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 cells, 5 to 30 minutes including verification. Large fleet retrofits, anything touching maintenance-token rotation or safety-PLC cutover, or cross-cell parameter migrations can stretch to half a shift because you have to wait for production-window clearance, OEM re-licensing, or coordinated maintenance windows.

Is there a rollback path?

Yes for most Semiconductors: Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 changes. Snapshot the firmware revision, photograph the parameter set, export the alarm history, and write down the maintenance token before any change. A few operations are one-way (cleared fault history past the OEM retention window, irreversible safety-PLC fuse, permanently revoked teach pendants). Check the in-controller maintenance help for the specific operation before you commit.

Will this affect other cells in the Semiconductors. Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 fleet?

Often yes. Semiconductors: Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 fleets share safety-PLC policies, OEM service-contract quotas, operator rosters, and fieldbus permissions across the whole plant (one maintenance-token grant holds permissions for many cells, one safety-PLC policy covers all stations, one service-contract tier covers all members). Use the Semiconductors. Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 OEM alarm history and the fieldbus drop list to enumerate dependencies before changing a shared component.

What if my firmware revision or parameter set does not match these steps?

OEM defaults move between releases. The steps in this page reflect mainstream defaults as of 2026-06-01 but the underlying recovery patterns do not change as fast. If a path differs on your firmware, fall back to the in-controller maintenance help, the Semiconductors: Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 OEM service bulletin history, or the OEM community forum - those almost always still work.

Where do I get OEM support if I am still stuck?

If you have a paid OEM service contract, open a case via the OEM hotline with: the exact verbatim alarm string, the failing photo, the cell or controller serial number, your maintenance-account email, the firmware revision, and your reproduction steps. The Semiconductors. Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 OEM community forum and r/PLC are the no-cost public alternatives - search there first; 80 percent of common Semiconductors: Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 alarms already have a working answer voted to the top.

References

OEM service manual for Semiconductors. Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 (official service bulletins, alarm code reference, safety case)
Controls-community forums (r/PLC, r/Robotics, r/CNC, r/Fanuc, r/KUKA, r/Cognex, r/labview, OEM community)
In-controller diagnostic help and the Semiconductors: Lithography Error Codes (Steppers, Scanners, EUV Reticle Handling, Focus/Dose/Overlay), 2026 firmware release notes
OEM service-status portals and OEM hotline post-mortem reports

Related guides worth a look while you sort this one out: