TELEDYNE API T703U - Troubleshooting the Ogenerator in the T703; Troubleshooting the Ogenerator in the T703 U

Teledyne API T703/T703U Calibrator Operation Manual General Troubleshooting & Service
177
WARNING
Hazardous voltage present - use caution.
TROUBLESHOOTING THE O
3
GENERATOR IN THE T703 8.6.1.
(See Section 8.6.1 for troubleshooting the T703U O
3
generator).
1. 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.
2. If this voltage is incorrect, check the DC test points on the relay PCA as
described in Section 8.4.3.
3. Begin generating O
3
.
4. Scroll to the Test Function O3GENDRV and note the reading in mVDC
[XXXX.X].
5. Remove the cover of the O
3
generator and check for the presence of the
following voltages on the UV lamp power supply PCA:
 Reading between TP1 and TP4 (grnd) should match the O3GENDRV
test function reading [XXXX.X] mVDC ± 10 mVDC
If this voltage is incorrect, either the UV lamp power supply PCA is faulty
or the I
2
C bus is not communicating with the UV lamp power supply PCA.
 Reading of +5VDC should be seen 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.
TROUBLESHOOTING THE O
3
GENERATOR IN THE T703U 8.6.2.
(See Section 8.6.1 for troubleshooting the T703 O
3
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 I
2
C 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.
07223D DCN7107