Background

Recently, some TH1.7 and TH2 heads have been returned with thick debris on the final lenses. This serves as a reminder that an effectively working debris removal system saves heads. Changes in media or exposure can result in dramatic changes in debris generation. Remember also that a dirty lens can significantly reduce power output and image quality. When troubleshooting an imaging related problem or when performing a PM, please check debris systems and final lenses. When checking the debris system, ensure that the flow marginal value is set correctly, as defined on page 4 of the Debris Removal Firmware Guide-Parameter Values, Descriptions and Flowchart and that the flow rate measured by the device when the debris system is operating is above the flow marginal value. See the links below for some examples showing the importance of lens cleaning and debris removal.

Examples

• Debris buildup on head nosepiece hose connection
• Debris buildup on head nosepiece surface
• Debris buildup in UDRC hose
• Dirty final lens
• Debris on shutter sensor
• Debris on shutter
• Lens before cleaning
• Lens after cleaning
• Dust caused by loading donor upside down

Procedures

• TH1.7 Debris Removal Nozzle Cleaning Procedure
• Thermal 2 Debris Removal Nozzle Cleaning Procedure
• TH1/1.7 Lens Cleaning Procedure
• Thermal 2 Window Cleaning Procedure
• Cleaning the Thermal 3 Final Lens and Debris Removal Nozzle
• TH3 Lens cleaning demonstration

Technical contact

Doug Jeffery

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Date submitted

18 Sep 2005