Service manual

4 115
Troubleshooting
Performance Tests Failure Troubleshooting
4. Troubleshooting
Performance Tests Failure Troubleshooting
Perform the following procedure sequentially when any performance tests fail.
Perform Adjustments and Correction Constants
Table 4-3 gives the recommended adjustments and correction constants when a
performance test fails. If a performance test fails, you should perform the corresponding
adjustments or correction constants function as shown in
Table 4-3. If the tests still fail,
refer to Table 4-4 and replace the assembly.
Note that this table lists some typical cases. In a few cases, other assembly may actually be
faulty.
Table 4-3 Troubleshooting Information for Performance Test Failure 1
Test
No.
First Failed Test Adjustment
Frequency Accuracy CC
Image Rejection CC
Lpot-Mixer Offset CC
Null Detector Offset CC
Null Loop Phase CC
Hpot-Amplifier Offset CC
Relative Impedance CC
DC Bias Monitor CC
DC BIas Level CC
OSC Level Monitor CC
OSC Level CC
Impedance Measurement CC
Oven Reference Adj ( Opt. 1D5 )
1 Frequency Accuracy Test
(Std)
√
Frequency Accuracy Test
(opt. 1D5)
√
2 OSC Level Accuracy Test
√ √
3 DC Bias Monitor
Accuracy Test
√
4 DC Bias Level accuracy
Test
√
5 Measurement accuracy
test
√ √ √ √ √