Specifications

140 5975 Series MSD Troubleshooting and Maintenance Manual
4 General Maintenance
To reassemble the EI ion source
Materials needed
• Gloves, clean, lint-free
• Large (8650-0030)
• Small (8650-0029)
• Hex ball driver, 1.5 mm (8710-1570)
• Hex ball driver, 2.0 mm (8710-1804)
• Wrench, open-end, 10 mm (8710-2353)
Procedure
1 Slide the drawout plate and the drawout cylinder into the source body
(Figure 22).
2 Assemble the ion focus lens, entrance lens, and lens insulators.
3 Slide the assembled parts into the source body.
4 Install the setscrew that holds the lenses in place.
5 Reinstall the repeller, repeller insulators, washer, and repeller nut into the
source heater assembly.
The resulting assembly is called the repeller assembly.
6 Reconnect the repeller assembly to the source body. The repeller assembly
includes the source heater assembly, repeller, and related parts.
7 Reinstall the filaments.
8 Reinstall the interface socket

CAUTION
Do not overtighten the repeller nut or the ceramic repeller insulators will break when
the source heats up. The nut should only be finger-tight.
CAUTION
Do not overtighten the interface socket. Overtightening could strip the threads.