Service manual

PN 4237242C
4.21-4
SERVICE AND REPAIR PROCEDURES
SYRINGE ASSEMBLY
5. Install the upper mounting plate (Figure 4.21-1):
a. Replace the upper lead screw hardware, with a spacer going on first, then the spring,
then another spacer.
b. Place the upper mounting plate onto the two syringe lead screws and fasten to the
two guide rods. Tighten each screw a bit at a time until both are tight.
c. Check that the drive belt is still around both gear assemblies. If it is, fasten the
upper mounting plate to the face plate.
d. Tighten all six face plate screws at this time.
6. Tighten the motor assembly to the proper belt tension. Belt tension is set to 4 lb at the
factory. An acceptable alternative is to tighten the belt such that easy finger pressure to
the belt will push it half way, or about 1/4 in. toward the belt on the other side of the
loop.
7. Verify that the belt gears are at the same level so that the belt is not at an angle. If an
adjustment is required, change the position of the motor gear.
8. Install the Syringe Assembly into the instrument:
a. Connect the four electrical connectors, P1 through P4.
b. Connect the three fluid lines.
c. Fasten the assembly to the instrument. Four Phillips-head screws fasten the Syringe
Assembly to the lower chassis (Figure 4.21-1).
r Two vertically-oriented screws are threaded to the floor of the lower chassis.
r Two screws remain along the top of the assembly, one left and one center.
9. Fasten the hinge bracket (Figure 4.21-1) and the door to the Syringe Assembly using
three Phillips-head screws and one nut.
Verification
1. Turn ON the instrument’s power.
2. Observe the Syringe Assembly during power up.
3. If no problems are observed, run a prime cycle to prime the system with diluent. Observe
the syringe area for smooth movement of the syringes and for fluid leaks.
4. If no problems are observed, replace the metal shield that covers the lower syringe area.
5. Perform an SVP (Heading 5.1).