Casio GZ-50M User manual

GM SOUND MODULE
GZ-50M
(with price)
POWER
VOLUME GM SOUND MODULE
MIN
MIDI
MONITOR DEMO PHONES
MAX
GENERAL

— 2 —
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:
No sound output 210 mA ±20%
Maximum volume 230 mA ±20%
with 32 polyphonic in tone No.078
Volume; maximum, Touch response: maximum
Phone output Level (Vrms with 8 Ωload each channel):
with keys C6 and F6 in tone No.078 85 mV ±20%
Line output level (Vrms with 47 KΩload each channel):
with keys C6 and F6 in tone No.078 300 mV ±20%
Minimum operating voltage: 4.0 V

— 3 —
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.

— 4 —
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)

— 5 —
Model GZ-50M MIDI Implementation Chart
Function ... Transmitted Recognized Remarks
X
X
X
X
❊❊❊❊❊❊❊❊❊❊❊❊❊❊
X
❊❊❊❊❊❊❊❊❊❊❊❊❊❊
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
❊❊❊❊❊❊❊❊❊❊❊❊❊❊
X
X
X
X
X
X
X
X
X
X
Mode 1 : OMNI ON, POLY Mode 2 : OMNI ON, MONO O : Yes
Mode 3 : OMNI OFF, POLY Mode 4 : OMNI OFF, MONO X : No
Basic Default
Channel Changed
Default
Mode Messages
Altered
Note
Number: True voice
Velocity Note ON
Note OFF
After Key's
Touch Ch's
Pitch Bender
01
06, 38
Control 07
Change 10
11
64
66
67
91
100, 101
120
121
Program
Change : True #
System Exclusive
System : Song Pos
Common : Song Sel
: Tune
System : Clock
Real Time : Commands
Aux : Local ON/OFF
Messages : All notes OFF
: Active Sense
: Reset
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]
1-16 channel
1-16 channel
Mode 3
X
❊❊❊❊❊❊❊❊❊❊❊❊❊❊
0 ~ 127
12 ~ 108 *1
O 9nH v = 1~127
X 9nH v = 0, 8nH V=❊❊
X
O *2
O
O *2
O *3
O
O
O
O
O
O
O
O *3
O
O
O 0 ~ 127
❊❊❊❊❊❊❊❊❊❊❊❊❊❊
O *4
X
X
X
X
X
X
O
O
X
*1:Different per tones.
❊❊ = No relation
Modulation
Data entry
Volume
Pan
Expression
Hold 1
Sostenuto
Soft
External effect depth
RPN LSB • MSB
All sounds off
Reset all controllers
Version: 1.0

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

— 7 —
*1 Tone without scale.
TONENO./TONENAME TONENO./TONENAME
REED SYNTH-SFX
064 SOPRANO SAX 096 PEARL DROP C2 – C7
065 ALTO SAX 097 SOUNDTRACK C2 – C7
066 TENOR SAX 098 CRYSTAL C2 – C7
067 BARITONE SAX 099 ATMOSPHERE C2 – C7
068 OBOE 100 BRIGHTNESS C2 – C7
069 ENGLISH HORN 101 LABYRINTH C2 – C7
070 BASSOON 102 ECHOES C2 – C7
071 CLARINET 103 COSMIC SOUND C2 – C7
PIPE ETHNIC
072 PICCOLO 104 SITAR C3 – F5
073 FLUTE 105 BANJO C3 – C6
074 RECORDER 106 SHAMISEN D3 – G5
075 PAN FLUTE 107 KOTO G3 – C6
076 BOTTLE BLOW 108 THUMB PIANO C3 – G5
077 SHAKUHACHI 109 BAG PIPE C2 – F5
078 WHISTLE 110 FIDDLE G3 – C7
079 OCARINA 111 SHANAI C3 – C5
SYNTH-LEAD PERCUSSION
080 SYNTH - LEAD 1 112 BELLS C5 – C6
081 SYNTH - LEAD 2 113 AGOGO C4 – C5
082 CALLIOPE 114 STEEL DRUM E3 – E5
083 POWER LEAD 115 WOOD BLOCK C4 – C5
084 METAL LEAD 116 TAIKO C4 – C5
085 ANGEL CHOIR 117 TOM C4 – C5
086 FIFTH LEAD 118 ELEC TOM C4 – C5
087 BASS+LEAD 119 REVERSE CYMBAL C4 – C5
SYNTH-PAD SFX
088 FANTASY 120 GT FRET NOISE C4 – C5
089 WARM STRINGS 121 BREATH NOISE C4 – C5
090 SYNTH-ENS 122 SEASHORE C4 – C5
091 SPACE CHORUS 123 BIRD C4 – C5
092 GLASS HARMONICA 124 TELEPHONE C4 – C5
093 ILLUSION 125 HELICOPTER C4 – C5
094 COUNTRY FARM 126 APPLAUSE C4 – C5
095 SYNTH-PAD 127 GUNSHOT C4 – C5
GMOCTAVERANGE
*1
F#3 – D#6
C#3 – G#5
F#2 – D#5
C#2 – G#4
A#3 – G6
E3 – A5
A#1 – C5
D3 – G6
D5 – C8
C4 – C7
C4 – C7
C4 – C7
C4 – C7
G3 – C6
C4 – C7
C4 – C6
A0 – C8
A0 – C8
C2 – C7
C2 – C7
C2 – C7
C2 – C7
C2 – C7
A0 – C8
C2 – C7
C2 – C7
C2 – C7
C2 – C7
C2 – C7
C2 – C7
C2 – C7
C2 – C7
GMOCTAVERANGE
*1
*1
*1
*1
*1
*1
*1
*1
*1
*1
*1
*1

— 8 —
LIST OF DRUM SOUNDS
NOTE NO. DRUM INSTRUMENT NAME
35
Acoustic Bass Drum
36
Bass Drum 1
C#2 37
Side Stick
38
Acoustic Snare
D#2 39
Hand Clap
40
Electric Snare
41
Low Floor Tom
F#2 42
Closed Hi Hat
43
High Floor Tom
G#2 44
Pedal Hi Hat
45
Low Tom
A#2 46
Open Hi Hat
47
Low Mid Tom
48
High Mid Tom
C#3 49
Crash Cymbal 1
50
High Tom
51
Ride Cymbal 1
52
Chinese Cymbal
53
Ride Bell
F#3 54
Tambourine
55
Splash Cymbal
G#3 56
Cowbell
57
Crash Cymbal 2
A#3 58
Vibraslap
59
Ride Cymbal 2
60
High Bongo
C#4 61
Low Bongo
62
Mute High Conga
D#4 63
Open High Conga
64
Low Conga
65
High Timbale
F#4 66
Low Timbale
67
High Agogo
G#4 68
Low Agogo
69
Cabasa
A#4 70
Maracas
71
Short Whistle
72
Long Whistle
C#5 73
Short Guiro
74
Long Guiro
D#5 75
Claves
76
High Wood Block
77
Low Wood Block
F#5 78
Mute Cuica
79
Open Cuica
G#5 80
Mute Triangle
81
Open Triangle
A#5 82
Shaker
83
Suzu
84
Sticks
C2
B1
D2
E2
D#3
F2
G2
A2
B2
C3
D3
E3
C4
B3
A3
G3
F3
G4
F4
E4
D4
D5
C5
B4
A4
C6
A5
G5
F5
E5
B5

— 9 —
BLOCK DIAGRAM
Working Storage RAM
(64K-bit)
LSI106
SRM2264LM90-B
EA0 ~ EA14
ED0 ~ ED7
RA0 ~ RA19
RD0 ~ RD15
WCK1 SLOP BCK
D/A Converter
LSI101
UPD6376GS
Filter
IC103
Main
Volume
Headphone
Amplifier
IC101
LA4525
CPU
LSI104
HD6433298A42F
A0 ~ A14
Power Supply Circuit
D102, D103
Q101~Q105
VCCAVDD VDD
DVDD
Effect RAM
(256K-bit)
LSI102
LC33832M-70
D0~D7
Headphone
A0 ~
A14
A0 ~ A3
MIDI IN
Filter
IC103
Power Switch
POWER
Reset IC
IC104
RH5VL36A
RESET
Photocoupler
IC106
PC900VP
Line Out Amplifier
IC102
M5218AFP
Mute Circuit
Q108, Q109
Line Out
DC IN
Sound Source ROM
(16M-bit)
LSI105
TC5316200CF-C117
DSP
LSI103
HG51B115FD
Power ON signal

— 10 —
CPU (LSI104: HD6433298A42F)
The 16-bit CPU contains a 32k-bit ROM, a 1k-bit RAM, seven 8-bit I/O ports and MIDI interfaces. The
CPU receives MIDI message and interprets it using the working storage RAM. For instance, when receiv-
ing NOTE ON message, the CPU sends the note number and its velocity to the DSP in order to produce
sound of that note.
The following table shows the pin functions of LSI104.
CIRCUIT DESCRIPTION
DIGITAL SIGNAL PROCESSOR (LSI03: HG51B155FD-1)
Upon receipt of a note number and its velocity, the DSP reads sound and velocity data from the sound
source ROM in accordance with the received MIDI message. Then it provides 16-bit serial signal to the
DAC. If a control change message or "an effect change" of exclusive message has been received, the
DSP adds the effect to the sound data using the effect RAM.
The following table shows the pin functions of LSI103.
Pin No. Terminal In/Out Function
1 P50/TXD — Not used
2 P51/RXD In MIDI signal input
3 P52/SCK Out Reset signal output
4 -RESET In Reset signal input
5 -NMI In Power ON trigger signal input
6 VCC In +5V source
7 -STBY In Standby signal input. Connected to +5V.
8 VSS In Ground (0V) source
9, 10 XTAL, EXTAL In 20MHz clock input
11, 12 MD1, MD0 In Mode selection input
13 AVSS In Ground (0V) source
14 ~ 20 P70 ~ P76 In Not used. Connected to ground.
21 P77 In DEMO button input signal
22 AVCC In +5V source
23 P60 Out LED drive signal output
24 ~30 P61 ~ P67 — Not used
31 VCC In +5V source
32 P27 — Not used
33 ~ 48 A0 ~ A14 Out Address bus
40 VSS In Ground (0V) source
49 ~ 56 D0 ~ D7 In/Out Data bus
57, 58 P40, P41 — Not used.
59 P42 Out Power ON signal output
60 P43 Out Read enable signal output
61 P44 In Write enable signal output
62 P45 — Not used
63 P46 Out Terminal for 10 MHz clock check point
64 P47 — Not used. Connected to +5 V source.

— 11 —
Pin No. Terminal In/Out Function
1 ~ 8 CD0 ~ CD7 In/Out Data bus
9, 10 CE1, TRSB — Not used
11 GND7 In Ground (0V) source
12 CK16 Out Terminal for 24.576 MHz clock check point
13 VCC1 In +5V source
14 CK0 In Clock input. Connected to terminal CK16.
15 TCKB — Not used
16 VCC1 In +5V source
17 GND1 In Ground (0V) source
18, 19 XT0, XT1 In/Out 24.576 MHz clock input/output
20 SGL In System control terminal. Single chip system: Open
21 CCSB In Chip select signal input
22 ~ 25 CA0 ~ CA3 In Address bus
26 CE0 In Not used. Connected to ground.
27 CWRB In Write enable signal
28 CRDB In Read enable signal
29 ~ 32 — — Not used
33 RESB In Reset signal input
34 TESB In Not used. Connected to +5V.
35 ~ 39 — — Not used
40 ~ 49
52 ~ 57 RD0 ~ RD15 In Data bus for the sound source ROM
50 VCC2 In +5V source
51 GND2 In Ground (0V) source
58 RA23 Out Not used
59 RA22 Out Chip select signal for the sound source ROM
60, 61 RA20, RA21 Out Not used
62 ~ 73
75 ~ 82 RA0 ~ RA19 Out Address bus for the sound source ROM
74 GND5 In Ground (0V) source
83 WOK2 Out Not used
84 VCC3 In +5V source
85 GND3 In Ground (0V) source
86 WOK1 Out Word clock for the DAC
87 SOLM Out Not used
88 SOLP Out Serial sound data output
89 BOK Out Bit clock output
90 ~ 92 — — Not used
93 VCC5 In +5V source
94, 95
97 ~ 105
107,109
110, 112
EA0 ~ EA12 Out Address bus for the effect RAM
96 EWEB Out Write enable signal for the effect RAM

— 12 —
Pin No. Terminal In/Out Function
106 EOEB Out Read enable signal output for the effect RAM
108 VCC7 In +5V source
111 ECEB Out Chip select signal output for the effect RAM
113 ~ 117 ED11 ~ ED15 — Not used
118 VCC4 In +5V source
119 GND4 In Ground (0V) source
120 ~ 122 ED8 ~ ED10 — Not sued
123 ~ 130 ED0 ~ ED7 In/Out Data bus for the effect RAM
131 GND5 In Ground (0V) source
132 ~ 134 — — Not used. Connected to ground.
135, 136 — — Not used
Block diagram of DSP and DAC circuit
DAC (LSI101: UPD6376GS)
The DAC receives 16-bit serial data and two clocks output from the DSP. The DAC converts the data into
analog waveforms by each channel and output them separately.
The following table shows the pin functions of LSI101.
DSP
LSI103
HG51B155FD-1
Effect RAM (256K-bit)
LSI102
LC33832M-70
Sound Source ROM
LSI105
TC5316200CF-C117
CE A0 ~ A19 D0 ~ D15
RA0 ~
RA19 RD0 ~
RD15
RA22
D0 ~ D7
A0 ~ A3
A13
SOLP
BOK
WOK1
EA0 ~
EA14
ED0 ~
ED15
CS WE
OE
D0 ~ D15 A0 ~ A14
ECEB EOEB EWEB PG
X102
24.576 MHz
DAC
LSI101
UPD6376GS
LOUT
ROUT
SOLP: Sound data
BOK: Bit clock
WOK1: Word clock
SI
CLK
LRCK
RD
WR
RESET
Power ON signal
CCSB
CRDB
CWRB
RESB

— 13 —
VDD
RESET CPU
LSI104
HD6433298A42F
Reset IC
IC104
RH5VL36A
Working Storage RAM
LSI106
LC3564SM-85
DSP
LSI103
HG51B155FD-1
VDD DVDD VDD
-RESET
POWER
From power switch -NMI To power supply circuit
Power ON signal
P42
Pin No. Terminal In/Out Function
1 SEL In Mode selection terminal. Connected to ground.
2 D.GND In Ground (0V) source for the internal digital circuit
3 NC Not used.
4 DVDD In +5V source for the internal digital circuit
5 A.GND In Ground (0V) source for the right channel
6 R.OUT Out Right channel sound waveform output
7, 8 A.VDD In +5V source for the internal analog circuit
9 R.REF In Right channel reference voltage terminal
10 L.REF In Left channel reference voltage terminal
11 L.OUT Out Left channel sound waveform output
12 A.GND In Ground (0V) source for the left channel
13 LRCK In Word clock input
14 LRSEL In Not used. Connected to ground.
15 SI In Sound data input
16 CLK In Bit clock input
Name Voltage For operation of
VDD +5 V CPU, Reset IC, Working strage RAM
DVDD +5 V DSP, Effect RAM, DAC, Pilot lamp
AVDD +5V DAC, Filter
AVCC +7 V Headphone amplifier, Line ount amplifier
VCC +8 V Mute circuit
POWER SUPPLY CIRCUIT
The power supply circuit generates five voltages as shown in the following table. VDD voltage is always
generated. The others are controlled by the power ON signal output from the CPU.
RESET CIRCUIT
When an AC adapter is connected, the reset IC provides a low pulse to the CPU. The CPU then initializes
its internal circuit and clears the working storage RAM.
When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU provides
the power ON signal to the power supply circuit and raises RESET signal to +5V to reset the DSP.

— 14 —
1
2
3
CH1
CH2
4
CH1
5
6
7
8
9CH1
CH2
1
2
Voltage VDD
Emitter of Q105
Initial reset signal
RH5VL36A pin 1
3
4
5
Power ON trigger -NMI
HD6433298A42F pin 5
Power ON signal
HD6433298A42F pin 59
Reset signal
HD6433298A42F pin 3
6
7
8
Word clock WOK1
UPD6376GS pin 13
Data SI (Note OFF)
UPD6376GS pin 15
Bit clock BOK
UPD6376GS pin 16
9MIDI data
PC900VP pin 4
Basic channel
Note No.
Velocity
: 1
: 60 (C3)
: 127 (Maximum)
0.1 s
CH1: CH2: 5 V5 V
5 µs
5 VCH1: 5 VCH2: 5 VCH3: 5 VCH1:
2 ms
0.1 s
CH1: CH2: 5 V5 V
CH1
CH2
CH3
MAJOR WAVEFORMS

— 15 —
0
A
B
CH1
CH2 C
CH1
D
E
CH2
0
A
DAC output
UPD6376GS pin 11
Filter output
M5218AFP pin 1
B
C
Line out amp. input (L-ch)
C111
Line out amp. output (L-ch)
C161
D
E
Headphone amp. input
LA4525 pin 7
Headphone amp. output
LA4525 pin 1
Program change (Tone No)
Note No. (Key)
Velocity
: 078 (Whistle)
: 81 (A4)
: 127 (Maximum)
CH1
CH2
1 ms
CH1: CH2:
1 ms
50 mV
~50 mV ~CH1: CH2:50 mV ~.5 V ~
CH1: CH2:10 mV
~1 V ~
1 ms

— 16 —
PCB VIEW AND CHECK POINTS
Top View
J104
IC106
R177
D107
R181R182
Q110R176
R178
C188
C162
C164
D109
R184
C137
C163
J103
J102
L104
J101
D104 C161
R171
Q108
R173
D105
IC104
C160
R170
Q109
R175
D106
X101
C152
R150
R149
R145
C140
R144
X102
LSI104
C138
R158
R159
C182
C153
LSI106
R160 C156
LSI103
LSI101
C157
C125 C136
C135
C117 Q105 C120
C105
R109 BE
R119
C118 C110
Q103
C106 C131
C133
C130
R130 R134
IC103
C123
C103
C102
C122
3
C101
FB111
CB101
1
IC101
VR101
C111
C113
C104
C121
C116
C119
D102
C108
C109 C114
R185
C183C185 15
FB112
R118
C107
CA101
C187
C184
R112
C186
R117
C112
2
9
8
7
6
10
11
151214
1
5
4
3
13

— 17 —
SRM2264LM90
SCHEMATIC DIAGRAM
PCBs JCM304-MA1M/MA2M
9
4
5
3
2
11
10
13
12
14
15
78
6
1
8.4 8.0
7.3 5.0
5.6
7.2
7.8
0.0
0.7
5.0
5.6

— 18 —
EXPLODED VIEW
3
1
2
5
4
6

Notes: 1. Pricesand specifications aresubjectto changewith-
out prior notice.
2. As for spare parts order and supply, refer to the
"GUIDEBOOK for Spare parts Supply", published
seperately.
3. The numbers in item column correspond to the same
numbers in drawing.
PARTS LIST
GZ-50M

FOB Japan
N Item Code No. Parts Name Specification Q N.R.Yen R
Unit Price
Main PCB M304-MA1M
N 1 6923 7150 PCB ass'y M304-MA1M with M140210*1 17,880 A
M304-MA2M
N LSI101 2114 4221 LSI UPD6376GS-E1 1 200 A
N LSI102 2012 0777 LSI LC33832M-70-TLM 1 410 A
N LSI103 2012 1316 LSI HG51B155FD-1 1 1,160 A
N LSI104 2012 0462 LSI HD6433298A42F 1 860 A
N LSI105 2012 1498 LSI TC5316200CF-C117 1 990 A
N LSI106 2012 0770 LSI SRM2264LM90-B 1 280 A
IC101 2114 2632 IC LA4525 1 89 A
N IC102, IC103 2114 4214 IC M5218AFP-600C 2 39 A
N IC104 2105 4536 IC RH5VL36AA-T1 1 44 A
N IC105 2105 4445 IC HD74HC08FPTR 1 34 A
N IC106 2114 4326 IC, Photocoupler PC900VP 1 140 A
N Q101 2250 1176 Chip transistor 2SA1577T106R 113 B
N Q102, Q104, 2252 1169 Chip transistor 2SC4081-T106S 38B
Q110
NQ103 2250 1183 Transistor 2SD2096T114F 160B
N Q105 2253 0644 Transistor 2SD1664T101R 1 23 B
N Q108, Q109 2253 0651 Chip transistor 2SD1757KT146S 218 B
N D102, D103, 2360 2541 Chip zener diode DTZTT115.6B 415 B
D105, D106
N D104 2390 2058 Chip diode 1SR154-400TE25 1 20 C
N D107, D108 2390 1820 Chip diode 1SS355TE-17 2 9 C
N D109 2390 2310 Chip schottky diode RB501H-TT11 1 22 B
J101 3501 7049 Power jack HEC2305-01-330 1 29 A
J102, J103 3612 0789 Jack YKB21-5010 2 60 A
N J104 3501 9786 DIN jack TCS5073-25-4151 1130 B
N VR101 2765 1778 Volume, with nut EVJC20F03B14 1 110 A
N X101 2590 2100 Ceramic oscillator CSACS20.00MX040-TC 1 71 B
N X102 2590 2107 Crystal oscillator HC-49S24A 1 130 B
Sub PCB M304-MA2M
N J201 3501 9793 Phone jack YKB21-5157 1 57 A
LED201 2370 0686 LED LN282RPX-(TT2) 1 22 C
LED202 2370 0889 LED LN382GPX-(TT2) 1 26 C
SW201, SW202 3412 0903 Tact switch EVQ-21405R 2 15 B
Cabinet
N2 6923 7480 Lower case M240162-1 1 210 C
N 3 6923 7440 Upper case M240161-1 1570 C
N4 6923 7450 Rotary knob M340189-1 1 21 C
N 5 6923 7460 Front panel M240160-1 1110 C
N6 6923 7470 Button M311687-7 2 11 C
Notes: N – New parts
M – Minimum order/supply quantity
R – Rank — 19 —