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Chapter 7
Servicing
This chapter explains how to replace the Model 42i Trace Level
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.
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
7-2
"Firmware
Updates" on page
7-4
"Accessing the Service
Mode" on page
7-4
"Replacement Parts
List" on page
7-4
"Cable
List" on page
7-6
"External Device Connection
Components" on page
7-6
"Removing the Measurement Bench and Lowering the Partition
Panel" on
page
7-8
"Pump
Replacement" on page
7-9
"Vacuum Pump Diaphragm and Valve
Replacement" on page
7-10
"Fan
Replacement" on page
7-14
"PMT Cooler and Reaction Chamber Assembly
Replacement" on page
7-
15
"Photomultiplier Tube
Replacement" on page
7-17
"PMT High Voltage Power Supply
Replacement" on page
7-18
"PMT Voltage
Adjustment" on page
7-19
Thermo Fisher Scientific
Model 42i Trace Level Instruction Manual
7-1
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Troubleshooting
