GEM PK7 Service Manual

SERVICE MANUAL
Schematic Diagrams
GENERALMUSIC S.p.A. Sales Division: 47048 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12 - tel. 0541/959511 - fax 0541/957404 - http://www.generalmusic.com
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.
Schematic Notes
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 1/8W unless otherwise specified.
C O D E : 2 7 0 2 0 6
Opening & Keyboard Disassembling Instructions
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.
Soldering point. Supply voltage.
Male connector. Logic supply ground.
Female connector. Analog supply ground.
M/F faston connector. Chassis ground.
Test point.
Flag joined with one or more flags with the same signal name inscribed.
Index & Warnings
2
3
Wiring & Block Diagrams
4
Power Amplifier & Supply Boards
5
Keyboard L/R Contact Boards
6
Cpu & Sound Generator Board (PK7)
7
Cpu & Sound Generator Board (PK5)
8
Audio/Video Interface Board (PK7)
9
Timings Table
10
Spare Part List
ATTENTION
Observe precautions when handling
electrostatic sensitive devices
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