Move the handset to the driver's control box C-2298 INT jack J803 (yellow band); then, turn the driver's
control box VOLUME control fully clockwise (maximum).
Sidetone loudness depends on the control box VOLUME setting. Check first at full volume;
then adjust the VOLUME control to a comfortable listening level.
In self-propelled howitzers, the driver's control box will work only when the control box MONITOR
switch is set to the ALL position.
d. EPC step 4. This step checks the driver's C-2298 control box operation.
(1) Check step 4a as follows:
(2) If step 4a checks good, do step 4b, as follows:
(3) If step 4b checks good, do step 4c.
Before checking step 4c, move the handset to the driver's control box RAD jack J802, and turn his C-
2298 MONITOR switch to INT ONLY, then proceed to step 4c.