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General Music GEM WK4 Service Manual

World keyboard, schematic diagrams
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SERVICE MANUAL
Schematic Diagrams
GENERALMUSIC S.p.A. Sales Division: 47048 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12 - tel. 0541/959511 - tlx 550555 GMUSIC I - fax 0541/957404
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 1 8 6
Opening & Keyboard Disassembling Instructions
Block Diagram, Midi & Controls I/O and Keyboard Int. Pcb Layouts
Midi & Controls I/O, Keyboard Interface & L/R Contact Schematics
Power Amplifier & Supply Schematic, Adjustment Table
Power Amplifier & Supply, Audio/Video Int., Phones & Trackball Pcb Layouts
Controls Panel, Trackball & Dc-Ac Converter Schematics
Controls Panel Pcb Layout & Reverse Layout
Cpu & Sound Generator Schematic (Part 1/2)
Cpu & Sound Generator Schematic (Part 2/2)
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.
Earth ground.
Flag joined with one or more flags with the same signal name inscribed.
Index & Warnings
Assembly & Wiring Connections
Cpu & Sound Generator Pcb Layout
Timing Table
Audio/Video Interface Schematic
Optional Accessories Mounting Instructions
Spare Part List
ATTENTION
Observe precautions when handling
electrostatic sensitive devices
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Summary of Contents for General Music GEM WK4

  • Page 1 Index & Warnings Opening & Keyboard Disassembling Instructions Assembly & Wiring Connections Block Diagram, Midi & Controls I/O and Keyboard Int. Pcb Layouts Midi & Controls I/O, Keyboard Interface & L/R Contact Schematics Power Amplifier & Supply Schematic, Adjustment Table Power Amplifier &...
  • Page 2 Opening Instructions refer to fig. 1 Fig. 1 To open the instrument remove the screws marked by To separate the keyboard from chassis remove the screws marked by (open the instrument before proceed) To access to the Disk Drive remove the screws marked by Keyboard Disassembling Instructions Keyboard Exploded View Sharp Key...

  • Page 3: Bottom Chassis

    Dial Encoder Left Mylar Strip Lcd Diplay Right Mylar Strip Pitch Board Right Tweeter Left Tweeter Right Woofer Left Woofer Top Chassis Control Board DC/AC Converter Board Transformer Ass’y Bottom Chassis A.C. Filter Board Transformer Contrast Adjustment Main Switch Phone Board After Touch Adjustment Power Amplifier &...
  • Page 4 GENERALMUSIC S.p.A. Italy DWG: 315024/088 DRW: BOCCATO SCHEMATIC DIAGRAM G. Boccato DWG# 550107 PCB# GENERALMUSIC S.p.A. ITALY Midi & Controls I/O Board, Keyboard ALL RIGHTS ARE RESERVED, NO COPIES OR CKD: RICCOBELLI DISK: 40 PART: 1/1 WK4 BLOCK DIAGRAM ALL RIGHTS ARE RESERVED, NO COPIES N.
  • Page 5 5 5 5 5 5...
  • Page 6 6 6 6 6 6...
  • Page 7 PHONES BOARD BOARD (PCB LAYOUT) PHONES BOARD BOARD (PCB LAYOUT) PHONES BOARD BOARD (PCB LAYOUT) PHONES BOARD BOARD (PCB LAYOUT) PHONES BOARD BOARD (PCB LAYOUT) TRACKBALL BOARD (PCB LAYOUT) TRACKBALL BOARD (PCB LAYOUT) TRACKBALL BOARD (PCB LAYOUT) TRACKBALL BOARD (PCB LAYOUT) TRACKBALL BOARD (PCB LAYOUT) POWER AMPLIFIER &...
  • Page 8 8 8 8 8 8...
  • Page 9 CONTROLS PANEL BOARD (PCB REVERSE LAYOUT) CONTROLS PANEL BOARD (PCB REVERSE LAYOUT) CONTROLS PANEL BOARD (PCB REVERSE LAYOUT) CONTROLS PANEL BOARD (PCB REVERSE LAYOUT) CONTROLS PANEL BOARD (PCB REVERSE LAYOUT) GENERALMUSIC S.p.A. Italy CONTROLS PANEL BOARD (PCB LAYOUT) CONTROLS PANEL BOARD (PCB LAYOUT) CONTROLS PANEL BOARD (PCB LAYOUT) CONTROLS PANEL BOARD (PCB LAYOUT) CONTROLS PANEL BOARD (PCB LAYOUT)
  • Page 10 10 10 10 10 10...
  • Page 11 11 11 11 11 11...
  • Page 12 CPU & SOUND GENERATOR BOARD (PCB LAYOUT). CPU & SOUND GENERATOR BOARD (PCB LAYOUT). CPU & SOUND GENERATOR BOARD (PCB LAYOUT). CPU & SOUND GENERATOR BOARD (PCB LAYOUT). CPU & SOUND GENERATOR BOARD (PCB LAYOUT). GENERALMUSIC S.p.A. Italy DWG: 315083 DRW: BOCCATO SCHEMATIC DIAGRAM Cpu &...
  • Page 13 13 13 13 13 13...
  • Page 14 14 14 14 14 14...

  • Page 15: Part List

    KIT 970214 (PAL) - KIT 970215 (NTSC) - Audio/Video interface mounting instructions: KIT 970207 - Hard disk installation kit mounting instructions: - Locate the CPU Board [A] and insert the buffer modules [2] into the connectors [H]. - Locate the CPU board [A] and remove the support [B] by screwing the locking screws [6]. Hard disk rear connector.
  • Page 16 140248 4 Poles Mini Din Female Socket 100740 HD6433278 Cpu F=20MHz 100731 DS1202 Clock Calendar Spare Part List Spare Part List Spare Part List Spare Part List Spare Part List Cabinet Assembly Cabinet Assembly Cabinet Assembly Cabinet Assembly Cabinet Assembly 140231 Horizontal Jack Stereo Socket (with dual switch) 100645...

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