74 Chapter2
Making Adjustments
10. CAL YTF Adjustment Routine
1. Press the following keys to activate title mode.
PRESET
CAL, More 1 of 4, More 2 of 4
SERVICE DIAG
DISPLAY CAL DATA
2. Record the displayed “Optimum Bias” DAC values for each
frequency band.
3. If the recorded “Optimum Bias” values are within the acceptable
ranges indicated in Table 2-5, RF section troubleshooting is
necessary.
If the recorded “Optimum Bias” values are not within the acceptable
ranges indicated in Table 2-5, complete the rest of this procedure to
initialize the mixer bias DAC values.
4. Press the following keys to allow entry of the default mixer bias DAC
values.
PRESET
FREQUENCY, −2001, Hz
DISPLAY
CHANGE TITLE
5. Enter CALMXRDATA 1600,1; as a title entry to set the mixer bias
value to 1600 for band 1.
6. Press the following keys to store the mixer bias value for band 1 in
nonvolatile memory.
CAL, More 1 of 4, More 2 of 4
SERVICE CAL
EXECUTE TITLE
Table 2-5 Acceptable Mixer Bias DAC Correction Values
Band Optimum Bias Acceptable
Bias Range
1 _________________ 800 to 1900
2 _________________ 0 to 200
3 _________________ 1000 to 1800
4 _________________ 400 to 750
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