GEM promega 2 Service Manual

SERVICE MANUAL
®
Index
2 Introduction, Checks & Adjustments.
3 RS232 PC - RS422 MAC Cables.
4 Block Diagram.
5 Lower Controls Panel Board Schematic & Timing Table.
6 Left Controls Panel Board Schematic.
7 Right Controls Panel Board Schematic.
8 Left & Lower Controls Panel PCB Layouts.
9 Right Controls Panel & Keyboard Interface PCB Layouts.
10 Keyboard Interface & L/R Contact Board Schematics.
11 Cpu & Sound Generator Board 1st version (part 1/2) Schematic.
12 Cpu & Sound Generator Board 1st version (part 2/2) Schematic.
13 Cpu & Sound Generator 1st version PCB Layout.
14 Cpu & Sound Generator Board 2nd version (part 1/2) Schematic.
15 Cpu & Sound Generator Board 2nd version (part 2/2) Schematic.
16 Cpu & Sound Generator 2nd version PCB Layout.
17 256+256Mb Dual Drake Sound Board (part 1/2) Schematic.
18 256+256Mb Dual Drake Sound Board (part 2/2) Schematic.
19
20 In/Out & 256+256Mb Dual Drake Sound PCB Layouts.
2
21
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.
✔
Ω
The (
✔
The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.
✔
All resistors are 1/8W unless otherwise specified.
✔
All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.
✔
Soldering point.
✔
Male connector.
✔
Female connector.
✔
ATTENTION
✒
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12
code 270285
¤
Phone +39(0)541/959511 - Fax +39(0)541/957404 - Internet: www.generalmusic.com
) omega symbol of resistance value is substituted by E.
Supply voltage.
Test point.
Flag joined with one or more flags
M/F faston connector. with the same signal name inscribed.
Observe precautions when handling electrostatic sensitive devices.
Logic supply ground.
Analog supply ground.
Chassis ground.
Earth ground.
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