GEM Pro1, Pro2 Service Manual

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Index

Opening & Keyboard Disassembling Instructions

3 4

Autotest Procedure Block Diagrams5

Power Supply & I/O, Line Input & Monitor Output Contact Schematics Contacts & Keyboard Interface Schematics, Timing Table7

8 PRO1 Controls Panel Schematic

PRO1 Cpu & Sound Generator Schematic

PRO2 Controls Panel Schematic10 PRO2 Cpu & Sound Generator Schematic11 Spare Part List

SERVICE MANUAL

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 (

✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

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. All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.

Soldering point. Male connector.

Female connector.

M/F faston connector.

ATTENTION

Address

Supply voltage. Logic supply ground. Test point.

Flag joined with one or more flags with the same signal name inscribed.

Observe precautions when handling electrostatic sensitive devices.

Analog supply ground. Chassis ground.

Earth ground.

CODE: 270146

GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12

✒

Phone 0541/959511 - Fax 0541/957404 - GENERALMUSIC on the NET: http://www.generalmusic.com

☎

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OPENING INSTRUCTIONS

To open the instrument remove the screws marked by an arrow and lift up the top chassis.

KEYBOARD DISASSEMBLING INSTRUCTIONS

To separate the keyboard from the bottom chassis remove the screws marked by the arrow

NOTE KEY DISASSEMBLING INSTRUCTIONS

To remove a key, insert a screwdriver or other similar object in the split at the key back, apply a light pressure and push in the direction shown. Note: Before you remove a natural key you must remove the keyboard from the chassis (as shown above), if you remove a sharp key

this operation is not necessary.

DRW CKD APP.

G. BOCCATO M. GALANTI M. GALANTI

DWG#

500758

DISK:

61/1

REV:

23/12/99

PCB# Opening & Disassembling Instructions

PRT:

GENERALMUSIC S.p.A. ITALY

ALL RIGHTS ARE RESERVED, NO COPIES OR REPRODUCE THIS DOCUMENT WITHOUT WRITTEN CONSENT BY GENERALMUSIC.

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AUTOTEST CHART

RP 1 PRO RP 2 PRO

Test Operation Description Event Description Display

Start

Turn on the instrument while holding pressed "SOUNDS" button.

A display message appears:

PRO1 AUTOTEST

-------------

PRO2 AUTOTEST

-------------

Memory

Display

LED

Buttons

Equalizer

(Pro2 only)

Press "SOUNDS" button.

Press "SOUNDS" button. Check that all leds light on.

Press "SOUNDS" button.

Press the UP and DOWN arrow buttons.

Press all panel buttons one by one except "SOUNDS" button.

Press "SOUNDS" button. The display shows temporarely:

Display shows current software version in EPROM:

The display shows a running dot while the Piano calculates the eprom checksum, after a few seconds the checksum value is displayed, check it with the hexadecimal code printed on the eprom label.

The display shows the memory address while the Piano checks the SRAM, after a few seconds the final address is displayed.

The display shows:

After a few seconds check that all the display segments turn black.

Moving the VOLUME and DATA potentiometers the display shows the corresponding position number from 0 to 127.

Display shows U (up) or D (down) letters on the left side.

Every button pressed must light corresponding led.

Moving the Equalizer potentiometers the display shows the corresponding position number from 0 to 127.

month day year

hour:min:sec v#.##

Please wait OK Checksum hhhh

RAM MEMORY CHECK

addr 2055BF OK

LCD DISPLAY TEST

----------------

--- LED Test --Are all leds on?

|Button Test |Vol:vvv Pot:ppp

U|Button Test

D|Vol:127 Pot:127

U|Button Test

D|Vol:127 Pot:127

month day year

hour:min:sec v#.##

Please wait OK Checksum hhhh

RAM MEMORY CHECK

addr 23FFFF OK

LCD DISPLAY TEST

----------------

--- LED Test --Are all leds on?

|Button Test |Vol:vvv Pot:ppp

U|Button Test

D|Vol:127 Pot:127

U|Button Test

D|Vol:127 Pot:127

EQ POT TEST ...

----------------

111 222 333 444 555 666 777 888

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Pedals

MIDI

Computer

Interface

Sinus Test

Exit

Note:

The display is shared in three

Press "SOUNDS" button.

Loop the MIDI IN and OUT connectors with a single MIDI cable.

Press "SOUNDS" button.

Loop the pin 3 and 5 of the COMPUTER socket.

Press "SOUNDS" button.

Press "SOUNDS" button. An end test message appears:

The autotest operations can be performed only in the sequence specified above. During test all normal keyboard functions are disabled. At the end of autotest a memory reset take place.

columns, one for each pedal damper (Da), Pedal1 (Pe) and Pedal2 (Pe).

Inserting a footswitch pedal in each socket the upper value must change from 0 to 127 accordly to the pedal position, the lower value must be always 0.

Inserting a variable analogic pedal in each socket the upper value changes to its maximum value (usually ranges from 110 to 120), the lower value vary from 0 to the maximum value accordly to the pedal position.

The display shows:

If loop is interrupted, display shows:

A display message appears:

If loop is interrupted, display shows:

Check with the oscilloscope a 1MHz clock signal on pin 1 of the COMPUTER socket. The instrument plays a 1KHz sinusoidal tone. TRANSPOSE buttons should slightly modify frequency.

:Da###|Pe###|Pe### :mp###|d1###|d2###

TEST MIDI IN/OUT LOOP DETECTED OK

TEST MIDI IN/OUT

--- NO LOOP! ---

TST COMPUTER I/O LOOP DETECTED OK

TST COMPUTER I/O

--- NO LOOP! ---

TEST TERMINATED!

SOUNDS to quit

SINUS SWEEP

Freq. 1000 Hz

:Da###|Pe###|Pe### :mp###|d1###|d2###

TEST MIDI IN/OUT LOOP DETECTED OK

TEST MIDI IN/OUT

--- NO LOOP! ---

TST COMPUTER I/O LOOP DETECTED OK

TST COMPUTER I/O

--- NO LOOP! ---

SINUS SWEEP

Freq. 1000 Hz

TEST TERMINATED!

SOUNDS to quit

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Spare Part List

Legend EU = specify European Version (230Vac) US = specify United States Version (115Vac) PRO1 = for PRO1 version only PRO2 = for PRO2 version only GEM = Gem Brand Version GM = Generalmusic Brand Version Code Description

Accessories

970183 230V AC/DC Adapter (EU) 970193 115V AC/DC Adapter (US) 271099 Owner's Manual (All Languages) 970134 Piano Single Foot Switch

Optional Accessories

130301 2mt Midi Cable 970013 Volume Pedal 970107 Professional Volume Pedal 970116 Single Pedal Switch 970080 Triple Pedal Switch 970134 Piano Single Foot Switch 970266 Piano Triple Pedal (Soft, Sustain with Switches Damper with Pot.) 970310 Multimedia Kit 130429 * 3mt RS232 Cable (Mini-Din 8 to D-Sub9) 970110 X-Metal Stand 970300 50+50W Amplified Stand (EU) 970311 50+50W Amplified Stand (US)

Cabinet Assembly

Bottom Chassis

660524 Bottom Chassis 651583 Left Side 651582 Right Side

Top Chassis

660523 Top Chassis (PRO1) (GEM) 660522 Top Chassis (PRO2) (GEM) 660538 Top Chassis (PRO1) (GM) 660537 Top Chassis (PRO2) (GM) 653122 Keyboard Left Side 651585 Keyboard Right Side 653326 “<>” Pad 653121 "Store"..."Sounds” Pad 653120 “Sequencer” and "Eq On/Off" Pad 653119 "Var","Sounds","Reverb","Effect","Touch" Pad 653117 "Local/Off" and "Demo" Pad 653116 "Master/Midi" and "Perf/Edit” Pad 651648 Plexiglass Display Screen 347255 Equalizer Slider Knob 340820 Slider Knob 340523 6,5mm Spacer 340512 Slider Potentiometer Guide 340435 Adhesive Foot 340357 Spacer For Left & Right Side 340092 5mm Board Spacer 210258 Slider Potentiometer Felt 171544 CPU Board Support 171543 Printed Circuit Panel Support 171542 Holder Square 171397 Right Side Spacer 110285 Power Switch

Keyboard & Interface Assembly

720489 Keyboard Assembly with Interface

840762 * 20 Wires 25cm Length Flat Cable 840761 * 20 Wires 12.5cm Length Flat Cable

760995 * Keyboard Interface Board (PCB#315024)

141018 ** 20 Contacts Vert Female Connector 141011 ** 6 Contacts Vert Female Connector 140918 ** 2 Contacts Hor Male Connector 100740 ** HD6433278 Cpu F=20MHz 100605 ** 74HC125 Quad 3-State Buffer 050493 ** Resistor Array 10K X4 1/8w 5% 050492 ** 10Kx8 1/8w 5% Resistor Array 050414 ** 2K2 X4 1/8w 5% Resistor Array 010726 ** 19.2MHz Ceramic Resonator With Capacitors 010662 ** 220p 10% 50V X8 Cap Array 010661 ** 47p 10% 50V X8 Cap Array

720490 * 88N Keyboard Assembly (TP20) 810552 ** 39N Left Contacts Board (PCB#310531)

340764 *** 3 Dual Contacts Rubber Strip 340211 *** 12 Dual Contact Rubber Strip 141018 *** 20 Contacts Vert Female Connector

141010 *** 4 Contacts Vert Female Connector 080103 *** 1N4148 100mA 75V Signal Diode

810551 ** 49N Right Contacts Board (PCB#310530)

340212 *** 13 Dual Contact Rubber Strip 340211 *** 12 Dual Contact Rubber Strip 141018 *** 20 Contacts Vert Female Connector 141010 *** 4 Contacts Vert Female Connector 080103 *** 1N4148 100mA 75V Signal Diode 160211 ** Key Return Spring (TP20) 151172 ** Last C Key (TP20) 151171 ** First A Key (TP20) 151170 ** Sharp Key (TP20) 151169 ** B Key (TP20) 151168 ** A Key (TP20) 151167 ** G Key (TP20) 151166 ** F Key (TP20) 151165 ** E Key (TP20) 151164 ** D Key (TP20) 151163 ** C Key (TP20)

Power Supply & I/O Board

730685 Power Supply & I/O Board (PCB#310582)

340138 * Dc-Socket Reinforcement 230569 * FL5R200PNT EMI Coil For Signal 230566 * 80/170uh 1,5a Switching Double Coil 230559 * 20uH 50V 3A Dc Line Filter 230527 * BL02RN2-R62 EMI Coil For Signal 141012 * 8 Contacts Vert Female Connector 141010 * 4 Contacts Vert Female Connector 140929 * 9 Contacts Vert Male Connector 140917 * 2 Contacts Vert Male Connector 140908 * 6 Contacts Vert Male Connector 140873 * 4 Contacts Vert Male Connector 140361 * 6 Contacts Vert Male Pass-Thru Connector (Phones) 140247 * 8p Mini Din Female Socket 140220 * Jack Slim H F Apj678 Adimpex 140212 * Horizontal Female 5 Poles Din Socket 140211 * Horizontal Male Dc Socket 110305 * Relay 12V / 2 Switch 1A 250V 100947 * L4920 1.2-20V Low Drop Adjustable Regulator 100919 * MC33078 Dual LN J-Fet Operational Amplifier 100901 * L4962 5-40V 1.5A Switching Regulator 100734 * MAX202E RS232 Drivers/Receiver 100626 * 74HC4053 3x2ch Analog Multiplexer 100602 * 74HC04 Hex Inverter 100035 * 6N138 Optocoupler 090153 * BC327 TO92 Pnp Transistor 090152 * BC337 TO92 Npn Transistor 080241 * 5V6 1W 5% Zener Diode 080170 * BYV27 2A 100V Fast Recovery Diode 080156 * 1N4002 1A 100V Rectifier Diode 080103 * 1N4148 100mA 75V Signal Diode 030950 * 470u 16v 20% Low Esr Vert Electrolytic Capacitor

Phones Board

730663 Phones Board (Pcb#315056) 140220 * Jack Slim Hor Apj678 Adimpex

Line Input & Monitor Output Board

730665 Line Input & Monitor Output Board (PCB#310559)

230569 * FL5R200PNT EMI Coil For Signal 230527 * BL02RN2-R62 EMI Coil For Signal 141010 * 4 Contacts Vert Female Connector 140908 * 6 Contacts Vert Male Small Connector 140222 * Jack Slim Vertical 140220 * Jack Slim H F Apj678 Adimpex 100919 * MC33078 Dual LN J-Fet Operational Amplifier 100902 * TDA1905 5W Power Amplifier

PRO1 Controls Panel Board

810307 Controls Panel Board (PCB#310556) 730520 * Pot. Board (PCB# 310507/1)

PRO1 CPU & Sound Generator Board

761132 CPU & Soumd Generator Board (PCB#315093/2)

550638 * 27C4001D 4Mbit Program Eprom 140877 * Jumper For Contacts Strip (p=2.54mm) 141018 * 20 Contacts Vert Female Connector 141012 * 8 Contacts Vert Female Connector 141011 * 6 Contacts Vert Female Connector 141010 * 4 Contacts Vert Female Connector 140929 * 9 Contacts Vert Male Connector 140889 * Dual In Line Vert Male Strip (specify contacts) 106001 * MC33078P Smd Dual LN J-Fet Operational Amplifier 105006 * HD6413003F16 Cpu 105009 * DISP3 Digital Sound Processor (Hitachi) 104022 * 23C32000G 32Mbit ROM ProWave2 104021 * AT24C32 SOIC 32KB EEPROM Memory 104020 * HM62256AFP-7T SOP Sram 256K Ta=70nS 104012 * 23C32000G SOP Rom 32Mbit Wave1 104010 * HM514280AJ SOJ Dram 4M5bit Ta=70nS 103010 * 74HC04D SOIC Hex Inverter 103009 * 74HC02D SOIC Quad 2-In Nor Gate 103007 * 74HC74D SOIC Dual Flip-Flop 103004 * AD1865R SOP 18bit D/A Converter 103002 * 74HC245DW Soic Octal Bus Transceiver 103000 * 74HC14D Soic Hex Inverter Schmitt Trigger 101501 * 74AC377DW SOIC Octal Dtype Flip Flop 081000 * PMLL4148 Smd 100mA 75V Signal Diode 055102 * 33E X4 1/16w 5% Smd Resistor Array 055101 * 4K7 X4 1/16w 5% Smd Resistor Array 055100 * 100E X4 1/16w 5% Smd Resistor Array 050492 * 10Kx8 1/8w 5% Resistor Array 010727 * 45.1584MHz Quartz Resonator 010704 * 16MHz Quartz Resonator 010662 * 220p 10% 50V X8 Cap Array

PRO2 Controls Panel Board

810306 Controls Panel Board (PCB#310554) 730520 * Pot. Board (PCB# 310507/1)

140874 ** Single In Line Vert Male Strip (specify contacts) 070551 ** 10K Linear 30mm Slider Potentiometer 340825 * 2.8mm Led Spacer 140918 * 2 Contacts Hor Male Connector 140874 * Single In Line Vert Male Strip (specify contacts) 140529 * Microswitch 12V 50mA 0.25mm 100740 * HD6433278 Cpu F=20MHz 100645 * 74HC4351 8ch Analog Multiplexer 100607 * 74HC164 8bit S To P Shift Register 100605 * 74HC125 Quad 3-State Buffer 090194 * BC560 TO92 Pnp Transistor 090183 * BC550 TO92 Npn Transistor 080748 * 2mm Dot Diffused Green Led 080747 * 2mm Dot Diffused Red Led 080745 * 2x16 Characters Lcd Display 080103 * 1N4148 100mA 75V Signal Diode 050492 * 10Kx8 1/8w 5% Resistor Array 010726 * 19.2MHz Ceramic Resonator With Capacitors 010661 * 47p 10% 50V X8 Cap Array

PRO2 Sliders Board

730662 Sliders Board (PCB#310555)

141015 14Contacts Vert Female Connector 070614 30mm 10K Lin Slider Potentiometer

PRO2 CPU & Sound Generator Board

761131 CPU & Sound Generator Board (PCB#315080)

550635 * 27C4096 4Mbit Program Eprom 110282 * 3.6V 60mAh Nicd Battery 230569 * FL5R200PNT EMI Coil For Signal 141011 * 6 Contacts Vert Female Connector 141010 * 4 Contacts Vert Female Connector 140929 * 9 Contacts Vert Male Connector 140889 * Dual In Line Vert Male Strip (specify contacts) 105006 * HD6413003F16 Cpu 105009 * DISP3 Digital Sound Processor (Hitachi) 104023 * 23C32000G 32Mbit ROM ProWave3 104022 * 23C32000G 32Mbit ROM ProWave2 104012 * 23C32000G 32Mbit ROM Wave1 104010 * HM514280AJ SOJ Dram 4M5bit Ta=70nS 104000 * HM628128LFP7 SOP 1Mbit (128Kx8) Static Ram 103010 * 74HC04D SOIC Hex Inverter 103009 * 74HC02D SOIC Quad 2-In Nor Gate 103007 * 74HC74D SOIC Dual Flip-Flop 103004 * AD1865R SOP 18bit D/A Converter 103002 * 74HC245DW Soic Octal Bus Transceiver 103001 * 74HC08D Soic Quad 2-Input And Gate

101501 * 74AC377DW SOIC Octal Dtype Flip Flop 100920 * LM336Z 2,5V 10mA Voltage Reference 100919 * MC33078 Dual LN J-Fet Operational Amplifier 100075 * LM311 Voltage Comparator 090194 * BC560 TO92 Pnp Transistor 081000 * PMLL4148 Smd 100mA 75V Signal Diode 055102 * 33E X4 1/16w 5% Smd Resistor Array 055101 * 4K7 X4 1/16w 5% Smd Resistor Array 055100 * 100E X4 1/16w 5% Smd Resistor Array 010727 * 45.1584MHz Quartz Resonator 010704 * 16MHz Quartz Resonator

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,

4) Reference name,

5) Quantity number.

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