Alesis QS6, Руководство по обслуживанию

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Alesis QS Series Keyboards Service Manual V1.00 25 11/19/06
4.20 QSR Disassembly/Reassembly
Figure 12 shows the location of the top panel screws. While this gives access to the top
of the PCB and is adequate for simple repairs, serious troubleshooting will require the removal
of the main PCB from the frame. Unscrewing the last 3 case screws on the bottom releases the
front panel and the rack ear/side panels from the frame. Finally the nuts are removed from the
cliff jacks to release the PCB from the frame. Reassembly is essentially the reverse process.
Figure 12 - QSR Case Screw Locations
4.30 Replacing A Whole Keyboard
This is the most extensive task that will ever need to be performed to a QS Series
keyboard. Fortunately this is a fairly rare occurrence.
First the casetop should be removed completely from the unit as described in Section
4.00. Once all of the cables to the casetop have been unplugged, it can be set aside until
reassembly and testing. Next all aftertouch and keyswitch cables from the keyboard should be
unplugged from the main PCB. Now the case bottom can be turned upside down and the
keyboard removal screws unscrewed. Once all of the screws are out, the case bottom can be
lifted away from the old keyboard. Installing the new keyboard is the reverse process. Note that
cables that were originally hot glued should be re-glued to prevent their coming loose during
shipping.
4.40 Replacing Individual Keys
Broken keys are an unfortunate consequence of the tough life that most professional
keyboards are required to undergo. So easy key replacement was a design requirement.
Figures 13 and 14 show the location of the key clip. A flat blade screwdriver inserted into the
slot in the key and then rotated will release the key. Note that it may be necessary to loosen
(but not necessarily remove) the keyboard assembly from the case bottom.