Thermo Fisher Scientific
Model 48
i
Instruction Manual
7-1
Chapter 7
Servicing
This chapter explains how to replace the Model 48
i
subassemblies. It
assumes that a subassembly has been identified as defective and needs to be
replaced (or is an “expendable” item, not covered under warranty.
Expendable items are indicated with an asterisk (*) in the “
Model 48i
Replacement Parts
” table.
For fault location information refer to the “
Preventive Maintenance
”
chapter and the “
Troubleshooting
” chapter in this manual.
The service mode described 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
” on page
7-41
.
This chapter includes the following parts information and component
replacement procedures:
●
“
Safety Precautions
” on page
7-3
●
“
Firmware Updates
” on page
7-4
●
“
Accessing the Service Mode
”
on page
7-4
●
“
Replacement Parts List
” on page
5-2
●
“
Cable List
” on page
7-6
●
“
External Device Connection Components
” on page
7-6
●
“
Removing the Measurement Case Assembly and Lowering the
Partition Panel
” on page
7-8
●
“
Fuse Replacement
” on page
7-8
●
“
Fan/Filter Replacement
” on page
7-10
●
“
IR Source Replacement
” on page
7-11
●
“
Filter Wheel Replacement
” on page
7-12
●
“
Chopper Motor Replacement
” on page
7-14
●
“
Optical Bench Replacement
” on page
7-15
●
“
Optical Switch Replacement
” on page
7-16
