GEM PRO1 Service Manual

SERVICE MANUAL
Index
3 Opening & Keyboard Disassembling Instructions
4 Autotest Procedure
5 Block Diagrams
6 Power Supply & I/O, Line Input & Monitor Output Contact Schematics
7 Contacts & Keyboard Interface Schematics, Timing Table
8 PRO1 Controls Panel Schematic
9 PRO1 Cpu & Sound Generator Schematic
10 PRO2 Controls Panel Schematic
11 PRO2 Cpu & Sound Generator Schematic
12 Spare Part List
Warnings
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 (
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.
ATTENTION
Address
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12
CODE: 270146
Phone 0541/959511 - Fax 0541/957404 - GENERALMUSIC on the NET: http://www.generalmusic.com
Ω
) omega symbol of resistance value is substituted by E.
Soldering point. Supply voltage.
Male connector. Test point.
Female connector. 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.
1