Figure 7-14. Replacing The Photo Interrupt Board - Thermo Scientific 5028i Instruction Manual

Proportional Valve
Replacement
Thermo Fisher Scientific
Unhook Cable
Figure 7–14. Replacing the Photo Interrupt Board
Use the following procedure to replace the proportional valve
7–15).
Equipment Required:
Proportional valve assembly
Hex driver, 3/32-inch
Equipment Damage Some internal components can be damaged by
small amounts of static electricity. A properly grounded antistatic wrist
strap must be worn while handling any internal component.
1. Turn the instrument OFF, unplug the power cord, and remove the
cover.
2. Refer to "Removing the Measurement Case Assembly and Rear
Panel" in this chapter to lower the partition panel, then proceed to
the next step below.
3. Disconnect connector from the measurement interface board.
4. Disconnect plumbing.
5. Remove four mounting screws and remove proportional valve
assembly.
6. Replace the proportional valve assembly by following the previous
steps in reverse.
7. Perform a leak test as described in the
chapter.
Proportional Valve Replacement
Unfasten screws (2)
(Figure
s
"Preventive Maintenance"
Model 5028i Instruction Manual
Servicing
7-27