5800 Refrigerated Sampler Service Manual

2.7 Disassembling the

Distributor

5800 Refrigerated Sampler Service Guide

Section 2 Sample Delivery System

Begin disassembly by removing the distributor module according

to steps 1 through 5 in Section 2.6.

1. Remove the nut and washer holding the ferrite bead in

place (Figure 2-26).

2. Remove the two screws and washers from the stepper motor mounting plate.

3. Slide the stepper motor assembly slightly toward the distributor shaft to disengage it from the timing belt and remove it.

4. Remove the two screws holding the optical sensor in place.

5. Slide the sensor away from the index disk and remove, taking care not to scrape it against the index disk.

Stepper motor

Ferrite bead

Optical sensor

Figure 2-26 Removal of stepper motor and optical sensor

Index disk

Timing belt

Note

The optical sensor is fragile. Set it aside so that it does not get broken. Inspect the sensor and replace if broken.

6. Remove the three large screws holding the cover plate in place. Remove the plate to expose the timing belt.

7. The timing belt, distributor shaft assembly, and band gasket simply lift out of the base.

2-21