TROUBLESHOOTING AND REPAIR
RF LEVEL/AM
1. Access R23 by removing the bottom instrument cover and removing the bottom
module cover.
2. Program the UUT to SPCL 01, and program the RF OUTPUT to OFF.
3. Connect the DVM to measure the voltage between TP7 and ground on the module
plate.
4. Adjust R23 for an indication of 0 mV ±0.5 mV.
5. Program the UUT RF OUTPUT to ON.
6. Reinstall the module plate cover and instrument cover when the adjustments are
complete.
Mod Control PCA AM DAC Offset Adjustment, R8 6D-12.
TEST EQUIPMENT:
•
DVM
REMARKS:
The AM DAC offset adjustment is normally required only when U8 or any associated
components are replaced.
CAUTION
This adjustment directly affects the output level and should not be made
indiscriminately.
PROCEDURE:
The AM DAC offset, R8, is adjusted for 0 ±0.5 mV at TP6 with AM off.
1. Access R8 by removing the bottom instrument cover and the bottom module plate
cover.
2. Program the UUT to SPCL 01.
3. Connect the DVM to measure the voltage between TP6 and ground on the module
plate.
4. Adjust R8 for an indication of 0 mV ±0.5 mV.
5. Reinstall the nodule plate cover and the instrument cover when the adjustments
are complete.
6D-11
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