Thermo Electron Corporation Model 42i Low Source Instruction Manual 7-1
Chapter 7 Servicing
This chapter explains how to replace the Model 42i Low Source
subassemblies. It assumes that a subassembly has been identified as defective
and needs to be replaced.
For fault location information refer to the “Preventive Maintenance”
chapter and the “Troubleshooting” chapter in this manual.
The service mode in the “Operation” chapter also includes parameters and
functions that are useful when making adjustments or diagnosing problems.
The service mode includes some of the same information found in the
Diagnostic menu, however, readings are updated every second in the service
mode compared with every 10 seconds in the Diagnostics menu.
For additional service assistance, see “Service Locations” at the end of this
chapter.
This chapter includes the following parts information and component
replacement procedures.
• “Safety Precautions” on page 7-3
• “Firmware Updates” on page 7-5
• “Replacement Parts List” on page 7-5
• “Cable List” on page 7-6
• “Removing the Measurement Bench and Lowering the Partition Panel”
on page 7-8
• “Pump Replacement” on page 7-11
• “Replacing a Fan” on page 7-13
• “PMT Cooler and Reaction Chamber Assembly Replacement” on
page 7-13
• “Photomultiplier Tube Replacement” on page 7-15
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