Service manual

PN 4237242C

5.2-1

MAINTENANCE PROCEDURES

PMI RECOMMENDATIONS

5.2 PMI RECOMMENDATIONS

The MD II is a low maintenance instrument that does not require a PMI. Those service

organizations that will perform PMIs on this instrument can consider the following

components and verifications for their procedure.

Components

Filters

The green fluid barriers and blue particle filters should be replaced on every PMI. The

effectiveness of these filters is determined by environmental and instrument conditions more

than by instrument cycle count.

Aged peristaltic pump tubing or contaminated diluent determine replacement of the blue

particle filter. Diluter problems, especially those associated with the VIC, determine

replacement of the green fluid barriers.

Peristaltic Pump Tubing

The peristaltic pump tubing should be changed every 18,000 instrument cycles. Find out the

customer's usage rate to decide whether this tubing should be changed every PMI or not.

Polyurethane Tubing

Polyurethane tubing should be changed when it loses its elasticity. When the tubing becomes

stiff and discolored it has lost its elasticity.

Syringes

The diluent and aspirate syringes should be changed every 35,000 instrument cycles or when

by visual inspection you can see that it needs changing. Even though discoloration caused by

rusting of the shaft may occur before 35,000 instrument cycles, performance should not be

affected.

Cleaning

1. Remove the dust from the upper chassis using a vacuum or brush.

2. Remove the salt deposits from the bath area and shield.

3. Inspect the tubing and fitting connections. Remove any salt deposits and repair any leaks

you find.

4. Bleach the baths and apertures.