Thermo Fisher Scientific Model 49i Primary Standard Instruction Manual 6-1
Chapter 6 Servicing
This chapter explains how to replace the Model 49i Primary Standard
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, testing, adjustment,
and calibration procedures, and component replacement procedures:
“Safety Precautions” on page 6-3
“Replacement Parts List” on page 6-4
“Firmware Updates” on page 6-4
“Replacement Parts List” on page 6-4
“Cable List” on page 6-6
“External Device Connection Components” on page 6-6
“Removing the Measurement Bench and Lowering the Partition Panel” on
page 6-8
“Fuse Replacement” on page 6-9
“Pump Replacement” on page 6-10
“Fan Replacement” on page 6-11
“Analog Output Testing” on page 6-12
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