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T
8.6.
ROUBLESHOOTING THE
The only significant components of the O
the power supply assembly for the UV source lamp and the lamp itself.
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. Remove the cover of the photometer and check for the presence of the following
voltages on the UV lamp power supply PCA:
•
•
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.
S
P
8.7.
ERVICE
ROCEDURES
D
-O
ISK
Replacing the Disk-on-Module (DOM) will cause loss of all DAS data; it also may cause
loss of some instrument configuration parameters unless the replacement DOM carries the
exact same firmware version. Whenever changing the version of installed software, the
memory must be reset. Failure to ensure that memory is reset can cause the instrument to
malfunction and invalidate measurements.
After the memory is reset, the A/D converter must be re-calibrated, and all information
collected in Step 1 below must be re-entered before the instrument will function correctly.
Also, zero and span calibration should be performed.
1. Document all instrument parameters that may have been changed, such as range,
auto-cal, analog output, serial port and other settings before replacing the DOM. (You
will need this information to re-enter at the end of this procedure).
2. Turn off power to the instrument, fold down the communications and output panel by
loosening the mounting screws.
3. When looking at the electronic circuits from the back of the instrument, locate the
Disk-on-Module in the right most socket of the CPU board.
152
O
G
ENERATOR
3
WARNING – ELECTRICAL SHOCK HAZARD
Hazardous voltage present - use caution.
If this voltage is incorrect, check the DC test points on the power distribution
board as described in Section 8.4.3.
+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
C bus is not communicating with the UV lamp power supply PCA.
2
+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.
-M
R
N
ODULE
EPLACEMENT
generator that might reasonable malfunction is
3
P
ROCEDURE
083730750B DCN8606
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Table of Contents
Troubleshooting
