Engineering change 4RV/2 –001
Notice: 4/12/99

Symptom:
In Some configurations and calibration levels, audio to the output driver stage of U21 will overdrive the op amp into distortion. This change is optional to installed users that are not experiencing any distortion.

Fix:
Reduce the gain of the 4RV/2-output driver U21 by reducing R6 from 47k to 33K or 22K. Production after 4/12/99 will have the 33k value installed.