CASIO GZ50M Service Manual

(with price)

GZ-50M

GENERAL

VOLUME

GM SOUND MODULE

POWER	MIDI	DEMO	PHONES
	MONITOR
	MIN	MAX

GM SOUND MODULE

CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

MIDI Messages receivable with GZ-50M . . . . . . . . . . . . . . . . . . . . . 3

Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Major waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

PCB View and Check Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

SPECIFICATIONS

GENERAL

Sound source:	The General MIDI system 1
	Number of tones:	128
	Number of drum sets: 8
	Number of layer voice: 32
Digital effects:	10, including Reverb-1, Reverb-2, Reverb-3, Chorus, Tremolo,
	Phase Shifter, Organ SP, Enhancer, Flanger, EQ Loudness
Demonstration tune:	Suite for Rebecca (Arranged and programmed by Wojtek Gogoleski)
Volume control:	Analog volume
MIDI monitor:	LED
Tuning:	Center: 440 Hz
Terminals:	Headphone Jack [Output impedance: 68 Ω, Output voltage: 0.3 V(rms)MAX],
	Line Out Jack [Output impedance: 2 KΩ, Output voltage: 1.5 V8rms) MAX],
	MIDI IN Jack, AC Adapter Jack (9 V)
Power source:	AC source only: AC adapter
Power consumption:	2.8 W
Dimensions (HWD):	35 x 113 x 169 mm (1-3/8 x 4-7/16 x 6-5/8 inches)
Weight:	450 g (1 lbs)

ELECTRICAL

Current drain with 9 V DC:	210 mA ± 20%
No sound output
Maximum volume	230 mA ± 20%
with 32 polyphonic in tone No.078
Volume; maximum, Touch response: maximum
Phone output Level (Vrms with 8 Ω load each channel):	85 mV ± 20%
with keys C6 and F6 in tone No.078
Line output level (Vrms with 47 KΩ load each channel):	300 mV ± 20%
with keys C6 and F6 in tone No.078
Minimum operating voltage:	4.0 V

— 2 —

MIDI messages receivable with GZ-50M

MIDI channel:	1 - 16 channel
Note On/Off:	Note number	0 - 127
	Velocity	1 - 127
Program change:	0 - 127 on channel 1 -9 & 11 - 16
	0 - 7 on channel 10
Pitch bend:	00H/00H - 7FH/7FH
Control change:	Modulation		Control No. 1	0 - 127
	Volume		Control No. 7	0 - 127
	Pan		Control No. 10	0 (left) - 64 (center) - 127 (right)
	Expression		Control No. 11	0 - 127
	Hold		Control No. 64	0 - 63: Off, 64 - 127: On
	Sostenuto		Control No. 66	0 - 63: Off, 64 - 127: On
	Soft		Control No. 67	0 - 63: Off, 64 - 127: On
	Effect depth		Control No. 91	0 -127
	All sounds off		Control No. 120
	Reset all controllers		Control No. 121
	* See next page for information about the initial settings.
	Local control On/Off		Control No. 122	0: Off, 127: On
	All notes off		Control No. 123
	Registered Parameter Number (RPN)				Control No. 36: LSB, No.37: MSB
	Pitch bend sense		Control No. 100	00H
			Control No. 101	00H
	Data entry		Control No. 6	00H	- 0CH
			Control No. 36	00H
	Fine tuning		Control No. 100	01H
			Control No. 101	00H		(20H: -50 cents)
	Data entry		Control No. 6	20H	- 40H - 60H	(40H: center)
			Control No. 36	00H		(60H: +50 cents)
	Coarse tuning		Control No. 100	02H
			Control No. 101	00H		(34H: -12 seminotes)
	Data entry		Control No. 6	34H	- 40H - 4CH	(40H: center)
			Control No. 36	00H		(4CH: +12 seminotes)
	RPN null		Control No. 100	7FH
			Control No. 101	7FH
Active sensing:
Channel pressure: Reconized as modulation
System exclusive: Effect change		[F0][44][0B][09][xx][F7]
			[xx]: [00] - [09], [0F]
			[00]:	Reverb1 (Stage)
			[01]:	Reverb2 (Hall)
			[02]:	Reverb3 (Room)
			[03]:	Chorus
			[04]:	Tremolo
			[05]:	Phase shifter
			[06]:	Organ speaker
			[07]:	Enhance
			[08]:	Flanger
			[09]:	EQ Loundness
			[0F]:	Effect OFF
	GM system on	[F0][7E][7F][09][01][F7]

*See next page for information about the initial settings in The General MIDI system.

—3 —

The initial setteings
Pitch bend:	0
Modulation:	0 (Off)
Expression:	127	(Maximum)
Sustain:	0 (Off)
Sostenuto:	0 (Off)
Soft:	0 (Off)
Channel pressure:	0 (Off)
RPN:	Null
The initial settings in The General MIDI system
Channel 1 - 9 & 11 - 16
Program change:	000	(Piano)
Pitch bend:	LSB: 40H, MSB: 00H
Modulation:	0 (Off)
Volume:	100
Pan:	64 (Center)
Expression:	127	(Maximum)
Sustain:	0 (Off)
Soft:	0 (Off)
Effect depth:	127	(Maximum)
Pitch bend sense:	02 (2 seminotes)
Coarse tune:	LSB:40H, MSB:00H
Fine tune:	LSB:40H, MSB:00H
RPN:	Null
Channel pressure:	0 (Off)
Channel 10
Drum set No.:	0
Volume:	100
Pan:	64 (Center)
Expression:	127	(Maximum)
Effect depth:	127	(Maximum)
Soft:	0 (Off)

— 4 —

Model GZ-50M		MIDI Implementation Chart
							Version: 1.0
Function ...		Transmitted			Recognized		Remarks
Basic	Default	X		1-16 channel
Channel	Changed	X		1-16 channel
	Default	X		Mode 3
Mode	Messages	X		X
	Altered
Note		X		0 ~ 127
Number:	True voice			12 ~ 108		*1	*1:Different per tones.
Velocity	Note ON	X		O	9nH v = 1~127
	Note OFF	X		X 9nH v = 0, 8nH V=			= No relation
After	Key's	X		X
Touch	Ch's	X		O *2
Pitch Bender		X		O
	01	X		O	*2		Modulation
	06, 38	X		O	*3		Data entry
Control	07	X		O			Volume
Change	10	X		O			Pan
	11	X		O			Expression
	64	X		O			Hold 1
	66	X		O			Sostenuto
	67	X		O			Soft
	91	X		O			External effect depth
	100, 101	X		O *3			RPN LSB • MSB
	120	X		O			All sounds off
	121	X		O			Reset all controllers
Program		X		O 0 ~ 127
Change :	True #
System Exclusive		X		O	*4
System	: Song Pos	X		X
Common	: Song Sel	X		X
	: Tune	X		X
System	: Clock	X		X
Real Time	: Commands	X		X
Aux	: Local ON/OFF	X		X
Messages	: All notes OFF	X		O
	: Active Sense	X		O
	: Reset	X		X
Remarks		*2: Vibrato effect is obtained when received either message of modulation or channel
		after touch.
		*3: Reception of pitch bend sense, fine tune, coarse tune, and RPN Null.
		*4: GM system on	[F0][7E][7F][09][01][F7]
		Effect Change	[F0][44][0B][09][xx][F7]
					[xx]: E_0[00] - E_9[09], Off[0F]
Mode 1 : OMNI ON, POLY		Mode 2 : OMNI ON, MONO					O : Yes
Mode 3 : OMNI OFF, POLY		Mode 4 : OMNI OFF, MONO					X : No

— 5 —

LIST OF TONES AND OCTAVE RANGES

TONE NO./TONE NAME GM OCTAVE RANGE	TONE NO./TONE NAME GM OCTAVE RANGE

PIANO					BASS
000	PIANO		A0 – C8		032	WOOD BASS	E1 – G3
001	HARD PIANO		A0 – C8		033	ELEC BASS 1	E1 – G3
002	STUDIO PIANO		A0 – C8		034	ELEC BASS 2	E1 – G3
003	HONKY-TONK		A0 – C8		035	FRETLESS BASS	E1 – G3
004	ELEC PIANO 1		E1 – G7		036	SLAP BASS 1	E1 – G3
005	ELEC PIANO 2		E1 – G7		037	SLAP BASS 2	E1 – G3
006	HARPSICHORD		F2	– F6	038	SYNTH-BASS 1	E1 – G3
007	CLAVELECTRO		C2	– C7	039	SYNTH-BASS 2	E1 – G3
CHROMATIC PERCUSSION					STRING/ORCHESTRA
008	CELESTA		C4	– C8	040	VIOLIN	G3 – C7
009	GLOCKENSPIEL		C5	– C8	041	VIOLA	C3	– C6
010	MUSIC BOX		C4	– C6	042	CELLO	C2	– C5
011	VIBRAPHONE		F3	– F6	043	CONTRABASS	E1 – G3
012	MARIMBA		C3	– C6	044	TREMOLO STR	E1 – C7
013	XYLOPHONE		F4 – C7		045	PIZZICATO STR	E1 – C7
014	TUBULAR BELLS		C4	– F5	046	HARP	B0 – G7
015	DULCIMER		C4	– C6	047	TIMPANI	C2	– A3
ORGAN					ENSEMBLE
016	ELEC ORGAN		C2	– C7	048	STRINGS 1	E1 – C7
017	JAZZ ORGAN		C2	– C7	049	STRINGS 2	E1 – C7
018	ROCK ORGAN		C2	– C7	050	SYNTH-STR 1	C2	– C7
019	CHURCH ORGAN		A0 – C8		051	SYNTH-STR 2	C2	– C7
020	REED ORGAN		C2	– C7	052	CHOIR	C3	– G5
021	ACCORDION		F3	– F6	053	MOON VOICE	C3	– G5
022	HARMONICA		C4	– C6	054	SYNTH-VOICE	C3	– C6
023	BANDNEON		F3	– F6	055	ORCHESTRA HIT	C3	– C5
GUITAR					BRASS
024	GUT GUITAR		E2 – C6		056	TRUMPET	A#3 – A#6
025	ACOUS GUITAR		E2 – C6		057	TROMBONE	A#1 – D#5
026	JAZZ GUITAR		E2 – D6		058	TUBA	F1 – G3
027	ELEC GUITAR		E2 – D6		059	MUTE TRUMPET	A#3 – A#5
028	MUTE GUITAR		E2 – D6		060	FRENCH HORN	F2	– F5
029	DIST GUITAR 1		E2 – D6		061	BRASS	C2	– C7
030	DIST GUITAR 2		E2 – D6		062	SYNTH-BRASS 1	C2	– C7
031	GT HARMONICS		E2 – D6		063	SYNTH-BRASS 2	C2	– C7

— 6 —

	TONE NO./TONE NAME GM OCTAVE RANGE	TONE NO./TONE NAME	GM OCTAVE RANGE

REED			SYNTH-SFX
064	SOPRANO SAX	F#3 – D#6	096	PEARL DROP	C2 – C7
065	ALTO SAX	C#3 – G#5	097	SOUNDTRACK	C2 – C7
066	TENOR SAX	F#2 – D#5	098	CRYSTAL	C2 – C7
067	BARITONE SAX	C#2 – G#4	099	ATMOSPHERE	C2 – C7
068	OBOE	A#3 – G6	100	BRIGHTNESS	C2 – C7
069	ENGLISH HORN	E3 – A5	101	LABYRINTH	C2 – C7
070	BASSOON	A#1 – C5	102	ECHOES	C2 – C7
071	CLARINET	D3 – G6	103	COSMIC SOUND	C2 – C7

PIPE			ETHNIC
072	PICCOLO	D5 – C8	104	SITAR	C3	– F5
073	FLUTE	C4 – C7	105	BANJO	C3	– C6
074	RECORDER	C4 – C7	106	SHAMISEN	D3	– G5
075	PAN FLUTE	C4 – C7	107	KOTO	G3 – C6
076	BOTTLE BLOW	C4 – C7	108	THUMB PIANO	C3	– G5
077	SHAKUHACHI	G3 – C6	109	BAG PIPE	C2	– F5
078	WHISTLE	C4 – C7	110	FIDDLE	G3 – C7
079	OCARINA	C4 – C6	111	SHANAI	C3	– C5

SYNTH-LEAD			PERCUSSION
080	SYNTH - LEAD 1	A0 – C8	112	BELLS	C5 – C6
081	SYNTH - LEAD 2	A0 – C8	113	AGOGO	C4 – C5
082	CALLIOPE	C2 – C7	114	STEEL DRUM	E3 – E5
083	POWER LEAD	C2 – C7	115	WOOD BLOCK *1	C4 – C5
084	METAL LEAD	C2 – C7	116	TAIKO *1	C4 – C5
085	ANGEL CHOIR	C2 – C7	117	TOM *1	C4 – C5
086	FIFTH LEAD	C2 – C7	118	ELEC TOM *1	C4 – C5
087	BASS+LEAD	A0 – C8	119	REVERSE CYMBAL *1	C4 – C5

SYNTH-PAD			SFX
088	FANTASY	C2 – C7	120	GT FRET NOISE *1	C4 – C5
089	WARM STRINGS	C2 – C7	121	BREATH NOISE *1	C4 – C5
090	SYNTH-ENS	C2 – C7	122	SEASHORE *1	C4 – C5
091	SPACE CHORUS	C2 – C7	123	BIRD *1	C4 – C5
092	GLASS HARMONICA	C2 – C7	124	TELEPHONE *1	C4 – C5
093	ILLUSION	C2 – C7	125	HELICOPTER *1	C4 – C5
094	COUNTRY FARM	C2 – C7	126	APPLAUSE *1	C4 – C5
095	SYNTH-PAD	C2 – C7	127	GUNSHOT *1	C4 – C5

*1 Tone without scale.

— 7 —