Alesis QS7.1 Manuel de service télécharger pdf (Page 44)

Alesis QS Series Keyboards Service Manual V1.00 35 11/19/06

6.20 QS7/8

6.21 QS7/8 Main Revision B

Table 9 - QS7/8 Main PCB Revision B Changes

PART NUMBER:

9-40-1241

CHANGES FROM REV:

A TO REV: B

DATE:

4/15/96

CHANGE:

Change all text from Rev A to B

Reroute 3.072Mhz signal

Add GND bar along back panel

Put GND vias under DACs

Update power diode part

Remove redundant REV.A labels

Move A.T. BLACK silk screen away from edge

Bump up trace below PCMCIA

Move 88 UPPER and 76 UPPER silk screen away from edge

Move D10 and D11 silk screen away from edge

<45 degree angle between J7 and C38

No solder paste for Heat Sink (Use V6 for CAM toppaste)***

Teardrop J21 traces

Adjust C53

Use C4 fiducials

Adjust C46

Add thermals to Heat Sink

Clean up logic

Add 470Ω in series for 3.072Mhz and 12.288Mhz

Plate mounting holes, and completely connect to GND plane

Move 20Mhz crystal closer to uP

Reroute VCO asic area

Move 0.1uF caps closer to power on FX and SG asics

Use 96 mil drill bit instead of 100mil

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Alesis QS7.1 Manuel de service Page 44