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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 Ω load each channel):
with keys C6 and F6 in tone No.078 85 mV ± 20%
Line output level (Vrms with 47 KΩ load each channel):
with keys C6 and F6 in tone No.078 300 mV ± 20%
Minimum operating voltage: 4.0 V
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