General Music WK 6, Service Manual

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Index
Soldering point.
Male connector.
Female connector.
M/F faston connector.
Test point.
Supply voltage. Logic supply ground.
Analog supply ground.
Chassis ground.
Earth ground.
Flag joined with one or more flags
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12 - tel. 0541/959511 - fax 0541/957404
GENERALMUSIC on the NET: http://www.generalmusic.com
Opening, Keyboard Disassembling Instructions and Autotest Procedure
2
Assembly & Wiring Connections
3
Block Diagram, Midi & Controls I/O and Keyboard Int. Pcb Layouts
5
Cpu & Sound Generator Map
6
Power Amplifier & Supply Schematic, Adjustment Table
7
Midi & Controls I/O, Keyboard Interface & L/R Contact Schematics
8
Controls Panel, Trackball & Dc-Ac Converter Schematics
9
Cpu & Sound Generator Schematic (Part 1/2)
10
Cpu & Sound Generator Schematic (Part 2/2)
11
A/V & Vocal Processor Schematic
12
Power Amplifier & Supply, Phones & Trackball Pcb Layouts
13
Spare Part List
14
Controls Panel Pcb Layout & Reverse Layout
4
A/V & Vocal Processor Pcb Layouts
Cpu & Sound Generator Pcb Layout
15
16
SERVICE MANUAL
CODE: 270215
6
8
Warnings
with the same signal name inscribed.
Address
ATTENTION
Observe precautions when handling electrostatic sensitive devices.
Notice
Service must be carried out by qualified personnel only.Any tampering carried out by unqualified personnel during the guarantee period
will forfeit the right to guarantee.
For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.
To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.
All components marked by this symbol have special safety characteristics, when replacing any of these components use only
manufacturer's specified parts.
The (µ) micro symbol of capacitance value is substituted by U.
The (
Ω
) omega symbol of resistance value is substituted by E.
The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.
All resistors are 1/8
Ω
unless otherwise specified.
All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.
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Assembly & Layout
Timing Table
17
18
2nd Edition