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Servicing
Heater Assembly Replacement
Heater Assembly
Replacement
7-32
Model 43i Trace Level-Enhanced Instruction Manual
11. Install the cover.
Use the following procedure to replace the heater assembly (Figure 7–15).
Equipment Required:
Heater assembly
Heat sink grease
Philips screwdriver
Allen wrench, 5-32-inch
Equipment Damage Some internal components can be damaged by small
amounts of static electricity. A properly ground antistatic wrist strap must
be worn while handling any internal component.
1. Turn instrument OFF, unplug the power cord, and remove the cover.
2. Disconnect heaters from the AC BENCH cable.
3. Using the 5-32-inch wrench, remove the four screws securing the
optical bench to the floor plate (Figure 7–6).
4. Lift the optical bench from the floor plate to gain access to the heater
assembly.
5. Remove two retaining screws and washers from each heater and remove
the heaters (Figure 7–15).
6. Apply heat sink grease to the new heaters as appropriate.
7. Fasten each heater with the two retaining screws and washers.
8. Secure the optical bench to the floor plate with the four screws.
9. Connect the heaters to the AC BENCH cable.
10. Replace the cover and plug in the power cord.
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Thermo Fisher Scientific
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