083730300A DCN8101 Maintenance and Service 139
5.8.3.2 ADJUSTING THE SYNC/DEMODULATOR, CIRCUIT GAIN
To adjust the sync/demodulator circuit gain:
1. Make sure that the analyzer is turned on and warmed up.
2. View the STABIL or CO STB function in the Dashboard.
3. Apply Zero Air to Sample Inlet of the analyzer.
4. Wait until the stability reading falls below 1.0 ppm.
5. Change the analyzer display to show the CO MEAS.
6. Remove the Sync/Demod Housing
• Remove the two mounting screws.
• Carefully lift the housing to reveal the sync/demod PCA.
Figure 5-17. Location of Sync/Demod Housing Mounting Screws
7. Adjust potentiometer VR1 until CO MEAS reads 4500 mV ± 300 mV
Figure 5-18. Location of Sync/Demod Gain Potentiometer
To Next Page
Loading...