Number of keys:61
Polyphonic:24-note
Preset tones:64
Keyboard controls:Touch response: On/Off,
Key transpose: Range from F# to F by a semitone increment
Auto-rhythms:64, Tempo control: 40 to 255
Auto-accompaniment:Mode: CASIO Chord/Fingered/Full-Range Chord 1/Full-Range Chord 2
Controller: Fill-In, Synchro/Ending
Digital volume controls:Main volume: 10 steps
Accompaniment volume: 100 steps
Demo tunes:3, A Night has 9000 Bars (arranged and programmed byThomas Hirsch)
MIDI Jacks (IN, OUT), AC Adapter Jack (9 V)
Auto power off:Approximately 6 minutes after the last operation
Power source:2-way AC or DC source
AC: AC adapter AD-5
DC: 6 D size dry batteries
Battery life: approx. 5 hours by manganese batteries R20P/SUM-1
Power consumption:7.7 W
Dimensions (HWD):99 x 931 x 326 mm (3-7/8 x 36-5/8 x 12-13/16 inches)
Weight:4.4 kg (9.7 lbs) excluding batteries
ELECTRICAL
Current Drain with 9 V DC:
No Sound Output180 mA ± 20%
Maximum Volume825 mA ± 20%
with keys C3 to E4 pressed in Synth-Lead 1 tone
Volume: maximum, Touch response: maximum
— 2 —
Headphone output level (Vrms with 8 Ω load each channel):
with key C3 pressed in Pan Flute tone210 mV ± 20%
Output level (Vrms with 47 kΩ load each channel):
with key C2 pressed in Pan Flute tone2000 mV ± 20%
Speaker output level (Vrms with 4 Ω load each channel):
with key A1 pressed in Pan Flute tone2150 mV ± 20%
When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The CPU
then initializes its internal circuit.
When the power switch is pressed, the CPU receives a low pulse of POWER signal.The CPU raises APO signal
to +5 V to turn power on.
CPU
LSI101
VDD
SCKO
POWER
APO
From power switchNMI
Power Supply Circuit
VDD
RE5VA35AA
Battery set
Reset IC
IC104
RESET
UPD912GF-3BA
CPU (LSI101: UPD912GF-3BA)
The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a keycontroller and serial interfaces.
The CPU detects key velocity by counting the time between first-key input signal FI and second-key SI from
the keyboard. The CPU reads sound data and velocity data from the sound source ROM in accordance with
the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then the
CPU provides 16-bit serial sound data to the DAC.The CPU also controls MIDI input/output and LED driving.
Sound Source ROM
LSI102
From keyboard
FI0 ~ FI7
SI0 ~ SI7
PG
X101
20 MHz
MX23C8100PC-12CA19
CE
A0 ~ A18D0 ~ D15
MSB0
MA1 ~
MA19
CPU
LSI101
UPD912GF-3BA
MD0 ~
MD15
SO: Sound data
BOK: Bit clock
LRCK: Word clock
SO
BOK
LRCK
SI
CLK
LRCK
UPD6379GR
DAC
IC103
ROUT
LOUT
— 5 —
The following table shows the pin functions of LSI101.
Pin No.TerminalIn/OutFunction
1TXD0Out MIDI signal input
2RXD0In MIDI signal output
3SCK0Out APO (Auto Power Off) signal output
4 ~ 6 Not used. Connected to ground.
7AVCCIn Ground (0 V) source
8, 9AN0, AN1 Not used. Connected to ground.
10AGNDIn Ground (0 V) source
11BCKOut Bit clock output
12SOOut Serial sound data output
13LRCKOut Word clock output
14GNDIn Ground (0 V) source
15, 16XLT0, XLT1In/Out 20 MHz clock input/output
17VCCIn +5 V source
18, 19MD0, MD1In Mode selection terminal. Connected to ground.
20RSTBIn Reset signal input
21NMIIn Power ON signal input
22INT Not used. Connected to ground.
23 ~ 30
31 ~ 38KC0 ~ KC7Out Key scan signal output
39 ~ 46
47 ~ 50In Not used.
51FI10In Button input signal input
52SI10In Not used
53 ~ 55KI0 ~ KI2In Button input signal input
56MWNBOut Not used.
57 ~ 76MA1 ~ MA17Out Address bus
77MCSB0Out Chip enable signal output for the sound source ROM
78, 79Out Not used
80VCCIn +5 V source
81GNDIn Ground (0 V) source
82MRDBOut Read enable signal output for the sound source ROM
83 ~ 98MD0 ~ MD15In/Out Data bus
99PLEOut Latch enable signal output for LED latches
100P17In APO cancellation signal input
FI0 ~ FI3
SI0 ~ SI3
FI4 ~ FI7
SI4 ~ SI7
In Key input signal
In Key input signal
DAC (IC103: UPD6379GR)
The DAC receives 16-bit serial data output from the CPU. The data contains digital sound data of the melody,
chord, bass, and percussion for the right and left channels. The DAC converts the data into analog waveforms
and output them to each channel separately.
— 6 —
FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the
waveforms.
Filter Block
To power amplifier
From DAC
POWER AMPLIFIER (IC102: LA4598)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC102.
Pin No.TerminalIn/OutFunction
1Power GNDIn Ground (0V) source
2Ch1 B.S. Terminal for a bootstrap capacitor
9Stand byIn Power control signal input. 0 V: Off, +9 V: On
10Ch2 INIn Channel 2 input
11Ch2 N.F.In Negative feedback input
12Ch2 OUTOut Channel 2 output
13Ch2 B.S. Terminal for a bootstrap capacitor
14NC Not used
POWER SUPPLY CIRCUIT
The power supply circuit generates six voltages as shown in the following table. VDD voltage is always
generated. The others are controlled by APO signal from the CPU.
176923 7060CaseM140171*1
17-16902 6140Battery spring (-)M41226-1
17-26903 2150Battery spring (+)M41330-1
186922 2771Key contact rubberM211704A-1
196922 2761Key contact rubberM211705A-1
226923 7000Bottom plateM240116-1
236918 1636Battery coverM311164F*1 1200B
Accessory
Notes: N – New parts
M – Minimum order/supply quantity
R – Rank
4
1
2120A
12,470C
127B
118B
489A
191A
1630C
6916 7880Music standM310827-1 1120B
100A
86A
Description of Capacitors
A general description of capacitors is shown in the following table.
The description consists of Type, Value, Rated Voltage and Tolerance.
When you need a capacitor, please find a substitution in your country by yourselves referring to the
description.
A general description of resistors is shown in the following table.
The description consists of Type, Value, Rated Wattage and Tolerance.
When you need a resistor, please find a substitution in your country by yourselves referring to the
description.
Note:
All resistors are carbon film, 1/5 watt, +/-5% otherwise specified.