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4. Periodically (every 6 months) or when a serious discrepancy occurs, repeat Steps I through 3 to
determine which piece of equipment is in error.
6.4 Verifying Supply Voltages
Troubleshooting the kVp meter consists of verifying the supply voltages.
Equipment recommended for troubleshooting the kVp Meter includes:
1. A digital voltmeter (Fluke Model 77 or equivalent).
2. A storage oscilloscope (Tektronix Model 2430 or equivalent).
Use the following procedure:
1. Connect the DVM negative lead to TP4 (circuit ground).
2. Apply power to the unit under test.
3. Test for the voltages listed in Table 7-1.
3. If any of the voltages cannot be verified, replace the faulty component (refer to the comments
column of Table 7-1).
The waveforms in Figures 6-2, 6-3, and 6-4 are provided for reference.
Table 6-1.
Test Point Voltages
Test Point
TP3
TP5
-5.0 to 6.0 V
TP10
If the kVp meter suddenly produces different results
from previous tests on only one machine, then
there is a strong probability that the kVp Meter is
operating correctly. If all of the x-ray measurements
suddenly change, then the kVp Meter may not be
operating correctly.
All measurements will be made with reference to
TP4.
Voltage
2.4 to 3.2 V
1.2 to 1.6 V
Derived from voltage divider R22, R23
Maintenance and Troubleshooting
Performance Verification (Calibration Constancy)
NOTE
NOTE
Comments
Derived from U101 on VRM board.
Derived from U101 on VRM board.
6
6-3
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