Sequential Circuits Prophet-5 Service Manual - Audiofanzine

4-21 FINAL VGA BAL1. Switch PRESET off and set controls according to Figure 4-8.2. Turn MIX OSC A to 0.3. Switch FILTKBD off.4. Switch UNISON on.5. Tie any key on by clipping J-wire to bus bar.6. Referring to Table 4-5, turn down Voice 2 - 5 volumes with trimmers listed.7. Check that R4529 is set for maximum Voice 1 volume.8. Probe U480-5 at left end of R4565-569.9. Trim R4520 for .000-V reading.10. Turn Voice 1 volume all the way down.11. Turn Voice 2 Volume up fully, and trim in the same way.12. Repeat for Voices 3 - 5.13. Untie key.Table 4-5FINAL VGA BALVOIGE VOLUME FINAL VGA BAL1 R4529 R45202 R4528 R45213 R4527 R45224 R4526 R45235 R4525 R45244-22 VOIGE VOLUME1. Switch PRESET off and set controls according to Figure 4-1 or faaory program 1-8.2. Adjust OSC A FREQ to 5.3. With scope, probe U480-7 at right end of R4564.4. Check that all Voice Volume trimmers are set for maximum volume {see Table 4-5).5. Play polyphonically and measure each voice level on scope. (To identify the voices, touch the OSCAs.).6. Turn down louder voices to volume of the softest voice.b.4-16