How to Inspect Used CVD Equipment Before Buying (APCVD, LPCVD, PECVD Checklist)

This guide is for: a process engineer or equipment buyer about to pull the trigger on a used CVD tool and wanting to know what separates a gem from a money pit.

I flew to Portland two years ago to inspect an Applied Materials Precision 5000 PECVD. The photos looked great—clean chamber, recent PM records, low hours. In person, the story changed. The chamber lid had hairline cracks in the ceramic coating. The gas panel valves were original 1990s vintage and seized half-open. The RF match network had arc burns on the tuning capacitors. The seller wanted $185,000. I told my client to offer $95,000 or walk. He walked. Six months later, that same tool was still listed—now at $75,000 with a "needs work" disclaimer. CVD equipment looks simple from the outside. The damage hides in the chamber, the gas system, and the RF subsystems.

A bad CVD purchase costs $150,000-400,000 for the tool, $30,000-80,000 for parts, and 3-6 months of lost production while you debug process issues. I've seen CVD tools with contaminated chambers that took six months to qualify because the previous owner ran a different chemistry.

APCVD vs LPCVD vs PECVD: Different Risks

Atmospheric Pressure CVD (APCVD) is the oldest and simplest. Tools like the Watkins Johnson WJ-999 or early ASM reactors run at atmospheric pressure—no vacuum system to fail. The risk is particle contamination and poor step coverage. Used APCVD prices run $25,000-75,000. Parts are often obsolete. Buy APCVD only if you specifically need atmospheric processing and have in-house maintenance capability.

Low Pressure CVD (LPCVD) uses hot-wall tube furnaces. The TEL Alpha series and ASM vertical furnaces dominate this space. Used prices range from $80,000 for an older horizontal furnace to $400,000+ for a vertical system with batch capability. The risk is heater element failure ($15,000-30,000), quartz tube degradation, and temperature uniformity issues.

Plasma-Enhanced CVD (PECVD) is what most buyers need. AMAT Precision 5000, Novellus Concept One/Two, and TEL Trias are common. PECVD adds RF power, gas plasma, and more failure points. Used prices run $150,000-500,000 depending on configuration. The complexity makes inspection critical.

The Chamber Inspection: Bring a Borescope

The deposition chamber is where the action happens. It's also where problems hide.

For PECVD tools, inspect the showerhead. The gas distribution plate has thousands of precisely sized holes. Plugged holes create film uniformity problems. A showerhead rebuild costs $8,000-15,000. Replacement is $15,000-30,000.

Check the chamber walls and liner. CVD coatings build up over time. Eventually, the coating flakes off—particles. Look for peeling, flaking, or discoloration. A quartz liner replacement on an AMAT P5000 runs $2,000-5,000 but protects the chamber from damage.

The pedestal or susceptor is critical. On electrostatic chuck systems, check for cracks, chips, or helium leak paths. ESC replacement costs $12,000-25,000. On grounded pedestal systems, check for accumulated film that affects temperature uniformity.

Gas Panel: The Most Neglected System

Gas panels are maintenance-intensive and often ignored until they fail. Every valve, MFC, and filter is a potential leak or contamination source.

Check valve cycle counts. Pneumatic valves last 1-3 million cycles depending on design. A high-use tool might have valves near end of life. Rebuilding a gas panel with 20 valves costs $15,000-30,000.

Mass flow controllers drift over time. Ask for recent calibration records. If unavailable, budget $500-1,500 per MFC for recalibration or replacement. A PECVD tool might have 6-12 MFCs. Brooks 5850E and MKS units are common—parts are available but not cheap.

Check for corrosion. Chlorine-based chemistries (TiCl4, WF6) attack stainless steel. Look for green or white corrosion on valve bodies and gas lines. Corroded panels need replacement—$20,000-50,000 depending on complexity.

RF Subsystem: PECVD's Power Source

PECVD requires RF power to generate plasma. The RF generator and match network are expensive and failure-prone.

Check the RF generator hours and recent service. An AE Pinnacle Plus 5000 with 50,000+ hours is due for refurbishment. Generator repairs run $5,000-15,000. Replacement is $25,000-40,000.

The match network tunes the RF to the plasma. Arcing, worn capacitors, and bad stepper motors are common. Check for arc damage—blackened areas on capacitors or coils. Match repairs cost $3,000-8,000.

Ask for reflected power data. High reflected power indicates poor matching or chamber issues. A healthy system should have reflected power under 5% of forward power.

Vacuum System: Foundation of LPCVD and PECVD

CVD requires precise pressure control. The vacuum system must hold base pressure and throttle accurately during deposition.

Test base pressure. A clean PECVD chamber should pump below 10 mTorr. Higher base pressure indicates leaks, contamination, or pump issues. A failing dry pump costs $15,000-25,000 to replace.

Check the throttle valve operation. It should move smoothly from fully open to fully closed. Sticking or jerky motion indicates wear or contamination. Throttle valve replacement is $5,000-12,000.

Turbo pump condition matters for LPCVD. Listen for bearing noise. Check rotation speed stability. Turbo rebuilds are $8,000-15,000.

Temperature Control: Critical for All CVD Types

Temperature uniformity determines film properties. Check calibration records for thermocouples and temperature controllers.

For hot-wall LPCVD, ask for recent temperature uniformity maps. A good furnace holds ±2°C across the wafer load. Poor uniformity indicates heater element degradation or control issues.

For PECVD, pedestal temperature control is critical. Check the heater assembly and thermocouple. Pedestal heater replacement costs $8,000-15,000.

Software and Process History

CVD tools store recipe and process data. This history is valuable—or problematic.

Ask what chemistries ran in the chamber. A tool that ran silane and TEOS can probably run your oxide process. A tool that ran tungsten CVD with WF6 might have fluoride contamination that's hard to remove.

Check if recipes transfer. Some tools have proprietary software that locks recipes to the original owner. Unlocking or replacing software costs $5,000-20,000.

What to Do Next

1. Inspect the chamber with a borescope—check showerhead, liner, and pedestal condition
2. Request gas panel maintenance records and MFC calibration data
3. Test RF generator output and match network tuning
4. Verify vacuum base pressure and throttle valve operation
5. Get temperature uniformity data for your process temperature range

CVD equipment runs for decades if maintained. It becomes a nightmare if neglected. The inspection takes a day. The regret lasts years.

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Related reading: Used AMAT Producer CVD Buying Guide | AMAT P5000 vs Centura CVD Comparison | Used Deposition Equipment PECVD vs LPCVD

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Last updated: May 2026. Information on semiconductor equipment availability and pricing reflects current secondary market conditions.

Page last reviewed May 2026. Pricing and availability reflect current 2026 secondary market conditions.