Sequential PROPHET-600 - ARPEGGIATOR; 4-2 ARPEGGIATE UP;DOWN

9. When OSC 1A is scaled, press any PROGRAM SELECT 1-6, to move on to OSC 2A.
The SEQ 2 LED will light, to indicate that Voice 2 should be trimmed.
10. Scale OSC 2A, then press any PROGRAM SELECT 1-6 to move on to 3A through
6A. (If it is desired to immediately exit the scaling routine without advancing through
any remaining adjustments, simply remove the TP301 jumper.)
11. After OSC 6A, trim OSC lB-6B(the second row of trimmers), then Filters 1-6 (the
third row). Note that when tuning filters, there is a slight delay before each voice
trimmer will respond.
12. After Filter 6 is scaled, pressing any switch 1-6 exits the scaling routine, activates
TUNE, then enters Preset Mode.
13. Remove jumper, press TUNE, then verify tuning by playing a few programs.
14. If the scaling procedure fails to correct an oscillator, repeat to be sure an error
wasn't made. To verify an oscillator IC is bad, exchange it with an oscillator from
another voice. Re-scale.
1-11 MODIFICATION CHECK
If the Prophet-600 is serial number 0001 through 0113, the modification described here
is required to prevent memory loss and erratic sequencer operation. Check for
existence on these units and install if necessary (order kit 0UD6OO-O1). This
modification is covered under warranty. (For more information, contact SCI Field
Service.)
Identifying the modification.
U310 EPROM should be labelled SIX.0.1. The hardware modifications are shown on
Figure 1-4. If these are not present, follow procedure below.
Insulate leads! I -tno*
- d**- - Diio-
1
Figure 1-4
MODIFICATIONS for units 0001 - 0113
TM600A 7/83
1-13