General Music AS-1 Service Manual

Spare Part List

Accesories

970235 230v 230mA AC/DC Adapter
660503 AS1 To WK Keyboard Attachment
271072 Owner's Manual
150618 M6 19mm Screw With Thumb
130430 1Mt Length Midi Cable
120456 M6 1.5mm Black Washer
120110 M6 12mm Screw

Assembly

660502 Top Chassis
652874 Bottom Chassis
340838 17 Keys Rubber Pad
340120 Plexiglass Display Screen
190015 Adhesive Rubber Foot
761097 AS1 Board (Pcb# 310537) (1st Version)
761133 AS1 Board (Pcb# 310568) (2nd Version)
550606 * 27C256 256Kbit Program Eprom (1st Version)
340856 * 6,4mm Led Spacer
230569 * FL5R200PNT EMI Coil For Signal
230559 * 20uH 50V 3A Dc Line Filter
140529 * Microswitch 12v 50ma 0.25mm
140212 * Horizontal Female 5 Poles Din Socket
140211 * Horizontal Male Dc Socket
110267 * 1Switches 2 Positions Hor Slider Switch
104019 * ST24W02 2Kbit Serial Access EEprom Smd
103016 * 74HC373DW Soic Octal D-Type Latch
103010 * 74HC04D Soic Hex Inverter
103002 * 74HC245DW Soic Octal Bus Transceiver
100744 * 80C251 Cpu (1st Version)
550640 * AT89C55 Programmed Cpu (2nd Version)
100059 * 7805 +5v 1A Voltage Regulator
100035 * 6N138 Optocoupler
091001 * BC857 TO236 Smd Pnp Transistor
081000 * PMLL4148 Smd 100ma 75v Signal Diode
080747 * 2mm Dot Diffused Red Led
080717 * HDN1105 7 Segments Display
080156 * 1N4002 1A 100V Rectifier Diode
010723 * 4MHz Ceramic Resonator With Capacitors

Note:

Each spare part is single 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 including:
1) Model name,
2) Section name,
3) Module code,
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
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.

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.
Soldering point. Supply voltage.
Male connector. Logic supply ground.
Female connector. Analog supply ground.
M/F faston connector. Signal ground.
Test point. Chassis ground.
Flag joined with one or more flags with the same signal name inscribed.
ATTENTION
Observe precautions when handling
electrostatic sensitive devices
SERVICE MANUAL

Schematic Diagrams

CODE : 270184