D-Series Syringe Pumps - Isco
D-Series Syringe Pumps - Isco
D-Series Syringe Pumps - Isco
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D <strong>Series</strong> <strong>Syringe</strong> <strong>Pumps</strong><br />
Section 5 Pump Maintenance & Repair<br />
9. Run the pump up to 20,000 psi, checking the pressure<br />
gauge for accuracy. If the reading is not within ±25 psi,<br />
readjust R27 to match the set pressure.<br />
5.11.4 Reset Circuit This adjustment is required if U101, and the ICL 7665, is<br />
replaced. It is done on the circuit board in the controller unit.<br />
1. Connect the common of the voltmeter to TP134.<br />
2. Turn the standby switch to the on position.<br />
3. Adjust R133 of the power supply circuit board in the pump<br />
unit to obtain a voltage of 4.875 ±0.001 volts at TP106 in<br />
the controller unit.<br />
4. Adjust R113 in the controller unit slowly clockwise until<br />
the voltage at TP105 switches high (approximately +5<br />
volts).<br />
5. Adjust R133 of the power supply board in the pump unit to<br />
regain a voltage of 5.000, ±0.002 volts at TP106 in the controller<br />
unit.<br />
5.11.5 A/D Circuit<br />
Adjustment<br />
5.11.6 Limit Sensor<br />
Adjustment<br />
This adjustment is done in the controller unit.<br />
1. Connect the common of the voltmeter to TP138.<br />
2. Turn the standby switch to the on position.<br />
3. Adjust R135 to obtain a voltage of 4.587 volts at TP124.<br />
4. Place a jumper between TP133 and TP139.<br />
5. Adjust R138 to obtain a voltage of 2.081 volts at TP139.<br />
6. Remove the jumper.<br />
7. Place a jumper between TP133 and TP138.<br />
8. Adjust R139 to obtain a voltage of 3.537 volts at TP139.<br />
9. Remove the jumper.<br />
In the event that the limit sensors must be replaced on the pump,<br />
use the following procedure:<br />
1. Disconnect the instrument from mains power.<br />
2. Disconnect the pressure transducer cable from the pump,<br />
and remove the tubing from the inlet and outlet ports.<br />
3. Loosen the four cover screws and remove the front and<br />
rear covers of the pump.<br />
4. The cylinder must be unscrewed several turns to avoid<br />
accidentally bottoming the piston out during calibration of<br />
the limit sensor. Therefore, loosen the cylinder lock screw.<br />
The lock screw is located in the front side of the cylinder<br />
mounting block and is a 1 4-20 setscrew.<br />
5. The limit sensor assembly includes two limit sensors, the<br />
wire harness and connector, and a conduit which protects<br />
the wires running between the sensors, Figure 5-10.<br />
Depending upon when your pump was manufactured, the<br />
protective conduit may be directly fastened to the pump or<br />
retained with mounting tabs and cable ties.<br />
5-19
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