Agilent Technologies 5975T LTM GC/MSD, Troubleshooting And Maintenance Manual

Page: 143 / 270

General Maintenance
10
Troubleshooting and Maintenance Guide 143
To Clean the EI Ion Source
Materials needed
• Abrasive paper (5061-5896)
• Alumina abrasive powder (8660-0791)
• Aluminum foil, clean
• Cloths, clean (05980-60051)
• Cotton swabs (5080-5400)
• Glass beakers, 500 mL
• Gloves, clean, lint-free
• Large (8650-0030)
• Small (8650-0029)
•
Solvents
•
Acetone, reagent grade
•
Methanol, reagent grade
• Methylene chloride, reagent grade
• Ultrasonic bath
Preparation
1
Disassemble the ion source. See page 141 .
2
Collect the following parts to be cleaned: ( Figure 13 )
• Repeller
• Interface socket
• Source body
• Drawout plate
• Drawout cylinder
• Ion focus lens
• Entrance lens
These are the parts that contact the sample or ion beam. The
other parts normally should not require cleaning.


C A U T I O N
If insulators are dirty, clean them with a cotton swab dampened with
reagent-grade methanol. If that does not clean the insulators,
replace them. Do not abrasively or ultrasonically clean the
insulators.