238S Dolby S Calibration

First, calibrate the unit with Dolby S out.

Set all channels to recording mode, then press Pause and Record.

Feed -10 dBV/0 dBVU 400Hz (316 mV RMS) signal to the line inputs, and use ENC ADJ trimmer to adjust AC voltage on TP1 of each channel board to be 388 mV.

Use ENC OUT trimmer to adjust AC voltage on REC LEVEL trimmer input lead (closest to the front) to be the same in both Dolby IN and OUT modes on each channel.

With Dolby S OUT, make a recording of -10 dBV/0 dBVU 400Hz test tone on all channels.

Set Dolby to IN, play back the recording and use DEC ADJ trimmer to adjust AC voltage on TP1 to be 388 mV on each channel.

Use DEC OUT trimmer to set voltage on the line out to -10 dBV (316 mV) on each channel.