Revision C Right Channel Normalization; Improvement Of High Frequency Phase Response; Improvement Of Power Supply Stability Under High Output Loading - Alesis 3630 Service Manual

6.22 Revision C Right Channel Normalization

Two cuts and two jumpers were installed
to correct a normalization error in Revision C
PCBs (See Figures 8 and 9 for details). Note that
this change was done largely at the factory and it
is extremely unlikely that you will ever see a unit
without it. It is included here for the sake of
completeness.
Figure 9-Revision C Jumpers

6.23 Improvement of High Frequency Phase Response

C5 and C14 should be changed from a 1500pF monoblock capacitor to a 470pF
monoblock (Part No. 1-21-4714).

6.24 Improvement of Power Supply Stability Under High Output Loading

It was found that under high output loading (i.e. the output voltage of the unit swings close
to the limits set by the power supply, and current demands are at maximum) the supply began to
contain significant amounts of ripple voltage which could cause excess distortion of the audio
output. To cure this, the power supply filter capacitor [C2] was changed from 100µF to 220µF.
Alesis 3630 Compressor Service Manual 1.00
Figure 8-Revision C Cuts
11 12/11/02