Used Semiconductor Equipment: Preventive Maintenance Plan
Build a preventive maintenance schedule for used semiconductor equipment from OEM procedures, service records and engineer-approved release criteria.
Building a preventive maintenance schedule for a used semiconductor tool? Start with its configuration, service history and applicable maintenance procedures. Use the worksheet below to turn those records into assigned work, documented intervals and a release decision.
Establish the baseline before scheduling work
Request the tool serial number, chamber configuration, installed peripheral list, maintenance manuals and available service logs. Record missing documents as open items. Have a qualified service engineer review the baseline before approving maintenance or production use.
For each subsystem, identify the relevant procedure and revision. Ask the reviewer to distinguish inspection, cleaning, replacement and qualification tasks rather than treating them as one service event.
Preventive maintenance schedule worksheet
Complete the interval column from the applicable procedure and your engineering review. Do not insert a generic hour count across all tool families.
| Scope to review | Schedule field to complete | Evidence to retain |
|---|---|---|
| Vacuum equipment | Applicable calendar, runtime or condition trigger | Model-specific service procedure and dated results |
| Chamber/process kit | Recipe-specific inspection and service trigger | Part/revision list and inspection record |
| Handling system | Inspection and qualification trigger | Approved handling test and alarm review |
| Gas and utility equipment | Applicable inspection/service requirements | Qualified service signoff |
| Electrical and control equipment | Approved inspection and maintenance scope | Procedure reference and completed report |
For each row, add the owner, last completion date, current counter reading where applicable, next due point, required materials and release criteria. Record the basis for any interval change and the approver.
What to do when maintenance history is missing
Ask the service engineer to define an incoming inspection and baseline service plan. Separate confirmed records from seller recollections. Do not assume that a counter reset establishes the previous service date.
Before starting work, require the applicable safety, isolation and decontamination procedures. Assign intrusive maintenance to appropriately qualified personnel. Keep this schedule as a planning document, not a substitute for the tool's service instructions.
Acceptance after maintenance
Agree on the release tests before work begins. Have your process team specify vacuum, handling and process checks where relevant, with test methods and acceptance limits tied to the installed configuration.
Retain the before/after results, replaced part numbers and revisions, outstanding faults and release approval. Reopen the work order if the agreed criteria are not met.
Budget and spare-parts planning
Request separate quotes for labor, approved replacement parts, testing and any outside service. Confirm the exact contents of a proposed PM kit before ordering. Obtain current supplier delivery estimates and align your maintenance window with the documented plan.
Should I use a universal 250/500/1,000-hour schedule? Populate the schedule from the applicable OEM procedures and engineering approval instead. Leave unsupported intervals unapproved.
Can I copy the previous owner's plan? Submit it for review against your installed configuration, intended process and service records before adopting it.
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Caladan stocks used and refurbished parts referenced in this article — tested, inspected, and ready to ship.