Teledyne T703, T703U 8.7. REPAIR PROCEDURES

Teledyne API T703/T703U Calibrator Operation Manual General Troubleshooting & Service

187

If the above voltages check out, it is more likely that a problem is due to the UV Lamp

than due to the Lamp Power Supply. Replace the UV Lamp and if the problem persists,

replace the Lamp Power Supply.

(See Section 8.6.1 for troubleshooting the T703 O3 generator).

1. Make sure the calibrator is idling in STANDBY mode.

2. Unplug the cable connector at P1 on the Lamp Power Supply and confirm that

+15VDC is present between Pins 1 and 2 on the cable connector.

3. If this voltage is incorrect, check the DC test points on the relay PCA as described

in Section 8.4.3.

4. Remove the cover of the photometer (see Figure 9-23) and check for the presence

of the following voltages on the UV lamp power supply PCA:

 +800 mVDC ± 10 mVDC between TP1 and TP4 (grnd)

If this voltage is incorrect, either the UV lamp power supply PCA is faulty or the

I2C bus is not communicating with the UV lamp power supply PCA.

 +5VDC between TP3 and TP4 (grnd)

If this voltages is less than 4.8 or greater than 5.25, either the 5 VDC power

supply or the UV lamp power supply PCA are faulty.

If the above voltages check out, it is more likely that a problem is due to the UV Lamp

than due to the Lamp Power Supply. Replace the UV Lamp and if the problem persists,

replace the Lamp Power Supply.

8.7. REPAIR PROCEDURES

The critical flow orifice is housed in the flow control assembly (Teledyne API part

number: 001760400) located on the top of the optical bench. A sintered filter protects

the jewel orifice so it is unusual for the orifice to need replacing, but if it does, or the

filter needs replacement please use the following procedure (see the Spare Parts list in

Appendix B for part numbers and kits):

1. Turn off power to the calibrator.

2. Locate the assembly to be repaired, see Figure 9-1 (T703) or Figure 9-2 (T703U).

3. Disconnect the pneumatic connection from the flow assembly.

4. Remove the fitting and the components as shown in the exploded view in Figure

8-5.

5. Replace the o-rings (p/n OR000001) and the sintered filter (p/n FL000001).

6. If replacing the critical flow orifice itself (P/N 000941000), make sure that the side

with the colored window (usually red) is facing downstream to the gas flow.

7. Apply new Teflon® tape to the male connector threads.

8. Reassemble in reverse order.

07223C DCN6572