Alesis QS Series Keyboards Service Manual V1.00
11/19/06
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1.20 QS7
The QS7 further expanded and improved the system used in the QS6. The larger QS7
is heavier and therefore less portable, but it’s expanded keyboard enhances it’s use as a
master keyboard controller for the studio. Refer to Figure 2 for a simplified view of the QS7’s
electronic systems. Note that the QS7 is electrically similar to the QS8 (same Main and
Xformer PCBs) and only vary in the number of keys used.
PCB
Schematic Revision
Main
QS7/QS8 F
Slider
QS7/QS8 A
Keypad
QS6/7/8 C
XFormer
QS7/QS8 C
1.30 QS8
In listening to the needs of keyboard players around the world, what came up
consistently was our need to improve the keys themselves. While the weighted keys of
previous units would suffice for most purposes, many high end players still preferred the “feel”
of real piano keys. In answer to this need, Alesis designed the QS8 88 key, piano weighted
keyboard. The keys were specifically designed to simulate the same “feel” that acoustic piano
keys have when the hammer strikes the piano strings. Incorporating the same basic sound
engine as it’s predecessors, the QS8 is sure to rank highly among players and composers
alike. (Minor improvements have be made through the lifetime of this product. This has
resulted in several main PCB revisions. Each revision incorporates previous changes as well
as any new improvements made. These changes are outlined in Appendix A. This manual
references the following schematics and component I.D.s unless otherwise noted: Refer to
Figure 2 for a simplified view of the QS8’s electronic systems.)
PCB
Schematic Revision
Main
QS7/QS8 F
Slider
QS7/QS8 A
Keypad
QS6/7/8 C
XFormer
QS7/QS8 C
