GEM GK350 User manual

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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 ith one or more flags
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN ITALY - Via delle Rose, 12
Phone [phone] - Fax [phone] - GENERALMUSIC on the NET: http://www.generalmusic.com
SERVICE MANUAL
CODE: 270259
Warnings
ith the same signal name inscribed.
Address
ATTENTION Observe
precautions hen 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
ill forfeit the right to guarantee.
For a correct operation of the instrument, after having s itched off, be careful to ait at least 3 seconds before s itching on again.
To improve the device's specifications, the schematic diagrams may be subject to change ithout prior notice.
All components marked by this symbol have special safety characteristics, hen 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 other ise specified.
All resistors are 1/8W unless other ise specified.
All s itches sho n in the "OFF" position. All DC voltages measured to ground ith a voltmeter 20KOhm/V.
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Index
Block Diagram & Wiring Connections, Specifications and Reset Procedure2
L/R Contact Boards, Keyboard Interface Board and Controls Panel Board 3
Cpu & Sound Generator Board
5
6Spare Part List
Power Amplifier & Supply Board
4
GK350
Arranger Keyboard

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Spare Part List
Code Description
Accessories
MDL345019 Music Stand
271330 GK350 Owner's Manual (En lish, Italian, French, German)
271331 GK350 Owner's Manual (Spanish, Dutch, Danish)
Optional Accessories
970315 AC-DC Adapter 230Vac 26.4W (Europe)
970316 AC-DC Adapter 115Vac 26.4W (U.S.)
130301 2mt Midi Cable
970116 Switch Pedal
970110 X Metal Stand
GK350 Assembl
MDL825002 Controls Panel Assembl
MDL815008 * Controls Panel Board (Pcb#31-1467-6)
MDL735016 * Lcd Displa Assembl (Pcb#31-1479-1)
MDL675004 * Actuators Kit (comprehensive of all actuactors)
MDL655023 ** <0> Rubber Actuator
MDL655022 ** <9> Rubber Actuator
MDL655021 ** <8> Rubber Actuator
MDL655020 ** <7> Rubber Actuator
MDL655019 ** <6> Rubber Actuator
MDL655018 ** <5> Rubber Actuator
MDL655017 ** <4> Rubber Actuator
MDL655016 ** <3> Rubber Actuator
MDL655015 ** <2> Rubber Actuator
MDL655014 ** <1> Rubber Actuator
MDL345013 ** Trapezoidal Grey Rubber Actuator
MDL345011 ** Circular Grey Rubber Actuator
MDL345024 ** Rectan ular Black Actuator
MDL345025 ** Pitch Bender Rubber Actuator
MDL345026 ** Square Dark Grey Rubber Actuator
MDL345027 ** Square Li ht Grey Rubber Actuator
MDL345028 ** Square Red Rubber Actuator
MDL345029 ** Square Yellow Rubber Actuator
MDL345030 ** Small Circular Grey Rubber Actuator
MDL345031 ** "TEMPO" Rubber Actuator
MDL345001 * Rubber Contact Strip (step=14mm)
MDL345000 * Sin le Rubber Contact for Controls
MDL655044 * Front Panel
MDL655045 * Lcd Display Screen
MDL345020 * Power On/Off Actuator
MDL115000 * On/Off Power Switch
MDL735014 * Volume Board
MDL345017 * Volume Knob
MDL765006 GK350 Cpu & Sound Generator Board (Pcb# 31-1523-4)
The service support is made only by replacement the entire Cpu Board
unless for the ICs listed below:
MDL105001 * CA8898 - DSP2000 (A401 ASIC for SAM9733/SING98)
MDL105002 * CA9888 Sin 98 or SAM9733 DREAM - Cpu & Dsp
MDL105003 * KS88P4504 - OTP Microcontroller for Keyboard & Disk Drive
MDL104001 * MX29F1610 or 16Mbit Rom -H GK330/350
MDL104003 * MX29F1610 or 16Mbit Rom -L GK350
100591 * GM82C765B Floppy Disk Controller
104020 * KM62256CLG SOP 256Kbit SRam Ta=55nS
103033 * TDA1305T SOT Dual Bitstream DA Converter
103031 * 74HC00D SOIC Quad 2-In Nand Gate
103030 * 74HC32D SOIC Quad 2-In Or Gate
103010 * 74HC04D SOIC Hex Inverter
103003 * 74HC374DW SOIC Octal D-Type Flip-Flop
MDL115001 * Lithium Battery type CR2032 3V-200mAh
010704 * 16MHz Quartz Resonator
MDL735017 Power Amplifier & Suppl Board
MDL100000 * AN7148 Dual Power Amplifier
MDL145000 * 5 Poles Din Socket
140217 * Jack Stereo Slim Horizontal Socket
140207 * Jack Horizontal Female Socket
140211 * Dc Horizontal Male Socket
100602 * 74HC04 Hex Inverter
090183 * BC550 TO92 Npn Transistor (9014C equivalent)
100035 * 6N138 Optocoupler
100059 * 7805 +5V 1A Volta e Re ulator
080187 * 1N5403 3A 300V Rect. Diode (1N5401 equivalent)
MDL725003 61Notes D namic Ke board
MDL765004 * Ke board Interface Board (Pcb#31-1235-11)
MDL100002 ** KS88C0504 Keyboard Interface CPU
MDL815006 * Right Contacts Board (30Notes) (Pcb#31-1135-9)
MDL815007 * Left Contacts Board (31Notes) (Pcb#31-1136-9)
MDL345009 * 1 Octave Sharp Keys
MDL345008 * D-F-A Natural Keys
MDL345007 * C-E-G-B Natural Keys
MDL345006 * 13 Contacts Grey Strip
MDL345005 * 13 Contacts White Strip
MDL345004 * Last C Key
MDL655043 Top Chassis
MDL665000 * Ri ht Speaker Grid
MDL665001 * Left Speaker Grid
MDL655041 Bottom Chassis (Batteries Slot included)
MDL345022 Batteries Cover
MDL225000 Low Ran e Speaker
MDL225001 Hi h Ran e Speaker
110400 * 3.5" Floppy Disk Drive
Note:
Each spare part is sin le quantity unless otherwise specified.
Asterisk prefix explanation:
Omitted = First level spare part.
One asterisk = Second level, part of previous listed first level part.
Two asterisk = Third level, part of previous listed second level part.
Three asterisk = ............
Any request for not above mentioned part must encompass specific description
includin :
1) Model name,
2) Section name,
3) Module code,
4) Reference name,
5) Quantity number.