Citizen GSX-190 Service Manual download pdf (Page 159)

PN 4237242C

4.23-1

SERVICE AND REPAIR PROCEDURES

VACUUM PUMP

4.23 VACUUM PUMP

Tools/Supplies Needed

B #2 Phillips-head screwdriver

Removal

1. Turn OFF the instrument’s power.

2. Disconnect the ac power cable.

3. Open the lower chassis, as directed under Heading 4.4, and locate the vacuum pump

(Figure 4.4-1).

4. Disconnect the electrical connector for the vacuum pump.

5. Disconnect the single tubing connected to the left end of the pump.

6. Remove the vacuum pump from the instrument. It is attached to the lower chassis floor

with four Phillips-head screws.

Installation

1. Check that there is a right-angle fitting on the vent port. This port is located on top of

the pump.

2. Connect the diluter tubing to the end port of the vacuum pump, and the electrical input

cable to the power supply cable that comes from J7 on the AC Power/Vacuum Relay card.

3. Fasten the pump to the floor of the lower chassis using four Phillips-head screws. Make

sure the output port of the pump faces left.

4. Close the lower chassis, reconnect the ac power cable and turn ON the instrument’s

power.

Verification

1. Perform a Vacuum Adjustment (Heading 4.30).

2. Run several sample cycles without aspirating anything.

3. Check for any fluid leaks from the probe wipe. Raw pump vacuum is used to evacuate

fluids from the probe wipe housing and you must verify that there is sufficient vacuum to

accomplish this.

4. Perform an SVP (Heading 5.1).

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Citizen GSX-190 Service Manual Page 159