Casio Realistic Concertmate 500 User manual

CONCERTMATE-500
Catalog Number:42-4004
CUSTOM MANUFACTURED FOR RADIO SHACK, ADIVISION OF TANDY CORPORATION

CONTENTS
SPECIFICATIONS 3
BLOCK DIAGRAM 5
CIRCUIT DESCRIPTION 6
MAJOR WAVEFORMS 14
TROUBLESHOOTING 16
PCB (Top and Bottom Views) 17
ELECTRICAL PARTS LIST 19
MECHANICAL PARTS LIST 25
EXPLODED VIEW/DISASSEMBLY 26
1C AND TRANSISTOR LEAD IDENTIFICATION 27
SCHEMATIC DIAGRAM 28

SPECIFICATIONS
Keyboard:
Chords:
Preset tones;
Effects:
Envelope selection:
Synthesizer function:
Auto-rhythms:
Auto accompaniment:
Function:
Memory play:
Sampling function:
Demonstration function:
Terminals:
Tuning control:
Speaker:
Power supply:
Auto power off:
Power consumption:
Dimensions:
32 Keys
4-note polyphonic
5PCM: piano, brass ensemble, trumpet, synth drums, human voice
3Harmonic synthesis: flute, pipe organ, jazz organ
Vibrato, portamento
13
Harmonic synthesis (16', 8', 5-1/3', 4', 2-2/3', 2\1-3/5', M/3', V
to 14 levels for each harmonic)
1 1 rhythms: disco, rock, pops, march, samba, bossa nova,
rhumba, 4-beat, swing, slow rock, waltz
Ftll-in key
Tempo keys
Concert chord: maj. min, 7th, min 7
Chord selector system: maj, min, 7th, min 7, maj 7,dim,
sus 4, aug 6th, min 6, m7-5, mM 7
Playback tones: 2
4-note polyphonic memory: 400 steps
3-channel multi-memory: Chords 99 steps,
solo 1/solo 2198 steps each
Auto play
One key play
Method: 8-blt PCM
Rate: 9.34 kHz
Time: 1.4 sec. (auto trigger system)
Input method: Internal microphone, external microphone, line
Loop set
Envelope select
Toy Symphony (one-touch endless)
MIC, LINE-IN, output (mini jacks)
t30 cents
3-1/8" (8cm) X1(output 1W)
Five AA-size batteries
External adapter
7min. after last operation
1.8W
18-1/8"(W) X6-1/8"(D) X1-3/4(H) or
461(W) X155(D) x44(H)mm
2.4 lbs (1.1kg) including batteries Weight:

ELECTRICAL SPECIFICATIONS
1.Current Drain at DC 7.5V Input
a) No sound output
b) Maximum sound output
with 4keys A4 thru D5 being pressed
simultaneously and with tone at Flute,
mode at Normal, envelope at G#5
2. Auto-power off Time
when A4 is turned to 442 Hz
3. Output Level
with C4 key pressed in Flute (47kohm load)
4. Sound Pressure Level
at 10cm away from speaker with G5 key
pressed in Flute tone
5. Pitch Variable Range
when A4 is turned to 442 Hz
Note: 1i»1/100 half note
6. Minimum Operating DC Supply Voltage
for sound to not distort noticeably
7. Mic Input Sensibility
at 1kHz for sampling
8. Line Input Sensibility
at 1kHz for sampling
9. Line Output Level
with A3 key by sampling external 1kHz
a) 4mV input at Mic
b) lOOmV input at Line
Nominal Limit
54mA 54mA ±30%
225mA 225mA ±30%
7min. 30 sec. 7min. 30 sec. ±1 min.
1.1V 1.1V ±30%
106dB 106dB ±lOdB
442Hz ±304 442Hz i304
5.5V 6.0V
4mV
lOOmV
470mV 470mV ±20%
550mV 550mV ±20%
Note: Nominal specs represent the design specs; all units should be able to approximate these
-some will exceed and some may drop slightly below these specs. Limit specs represent
the absolute worst condition that still might be considered acceptable; in no case should
aunit perform to less than within any limit spec.

BLOCK DIAGRAM
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CIRCUIT DESCRIPTION
CPU (MSM6283 01GS; LSI Y)
•Generates pitch and envelope signals for melody, chord, bass, and obbligato sounds.
•Provides percussion sounds.
•Controls keys, switches, RAMs, and ROM.
The following is alist of pin functions of the CPU.
PinNo. Terminal Name In/Out Functkon
1BOND Ground iOV) source ror AOC iAnalog to Dignal Converter)
2'VAOC *-5V source tor AOC
3.4 TNo fur^citon.
5-11 1100-106
»
In/Out Data bus <100- 106).
"^12 ’AO Out .Address bus (AO).
13 :107
•*
1m/Out Data bus (107).
14 A1 1Out Address bus (A1).
is’ 'CE
¥^
'Out Chip enable sigr>al for the memory devices.
16-18 A2. A10. A3
T•
Out Address bus <A2, A3. A10).
19 idE
•«Out Output enable signal for the memory devices.
^20-30 IA4-9. All-15 Out Address bus (A4 -A9, A1 1-A15).
A
”’31* *
Iwt Ww
Out Write signal output.
1When "L". the CPU writes data into the memory devices.
32 1RPSH 1Out Refresh signal output.
When 'X*'. the CPU refresh the memory data of RAMs.
~33-39 fr~ No function.
40 [gno ^Ground (OV) source.
“‘41.42* r
1No function.
43 VDD1
1
1-5V source.
“44-66*” No function.
"stTbs ”
,OSI.OSO 'Irt/Out 7.24 MHz clock pulse inputs.
59 '1
»—1
No function.
60 1
1
RESET In Reset signal input. "H" active.
At power ON, the terminal receives art ''H" level pulse so that the CPU's internal
[circuits are initialized.
61 ‘k015 1
t
Out |~Control signal for external filter circuit.
“62-66“^ No function.
~67-76“ K09 -KOO Out ^Key ar>d switch common signals output.
77~84 1KI1 -kl8 In Key and switch input signals input.
85 No function.
86 *P01 *
j
Out APO (Auto Power Off) signal.
When the instrumertt is left unoperated for approximately 7minutes, the
terminal drops to "V level to shut the voltages off.
87 1.No function.
88 P03 rOut 'Control signal for external filter circuit.

Pin No. Terminal Name 'In/Out 1Function
89 EH Out {Melody envelope signal output.
90 EG Out 1Melody or obbligato envelope signal output.
91 EF Out Melody or chord envelope signal output.
92 EE iOut Melody or bass envelope signal output.
93 !SH Out 1Melody pitch signal output.
94 'SQ Out 'Melody or obbligato pitch signal output.
95 SF Out Melody or chord pitch signal output.
^96 *
ISE Out Melody or bass pitch signal output.
SC ;Out
i— Analog percussion signal output.
,
1
98 •AGNO 1Ground (OVI source for DAC (Digital to Analog Converter).
99 VDAC i—5V source for DAC.
j
Vin r’
11
^Sample sound signal irtput.
Note: Since this LSI functions as negative l09ic, OV is provided to VDD1 terminal while *^5V source
is appiied to GND terminal.
Keyboard Matrix
KM 1KI2 KI3 KI4 KIS KI6 KI7 KIS
KCO SAMPLING j
1
LOOP SET 1
I
DEMO ONE KEY
PLAY RONE KEY PLAY L
•
KCl PORTA-
MENTO HARMO. ; SYNTH. ENVELOPE SELECT VIBRATO
1
F3 F3#
1
G3 G3#
KC2 MEMORY !
PLAY 1
,1
RESET 1
1
RHYTHM
;SELECT
1
'FILL-IN A3 A3# B4
J
C4
KC3
••
TEMPOS
1
TEMPO '
1DELETE
1
CLEAR 1
i
1
C4#
f•
1D4 1
.J
1
D4# E4
KC4 SAMPLING
SOUND
•
HARMONIC '
SOUND
11“•1
1
1
1
•
F4
1
•
F4# G4
» -
KC5
1
j
1
w^^^4
1
A4 A4# :1 64 '
1
:C5
•KC6 JAZZ
ORGAN PIPE ORGAN 1FLUTE
1
HUMAN
VOICE C#6 D5 1D6#
1
1
KC7 SYNTH
DRUMS TRUMPET 1BRASS
lENSEMBLE
1
PIANO 'F5 F5#
t
=5 G5#
KC8 NORMAL SOLO 1SOLO 2CHORD 1
A5 A5# B5 C6
KC9 1PLAY RECORD !
1
POWER
OFF

Nomenclature of keys
F3 A3 C4 E4 G4 B4 OB F5 AS C6
G3 B3 04 F4 A4 CS £5 Q5 B&
Envelope/Pitch Mixing Circuit
The Concertmate-500 has four Envelope/Pitch mixing circuits. The circuits generate melody,
obbligato, chord and bass sounds by means of amixing envelope and pitch signals from the CPU.
At "NORMAL" mode, all of the four circuits generate melody signal, while they create melody,
obbligato, chord, and bass sounds individually at the other modes.
Note: The waveforms are only for understanding
the principle of the above circuit.
The actual waveforms differ from the
figure.
(§):(!>« 10:1
Figure 2
The pitch signal PS from the CPU is amplified by differential amplifiers (transistors T1 5and T16).
Since the envelope signal ES from the CPU is astepped waveform, the CR circuit smoothes it.
These signals are mixed in transistor T17. and the mixed sound signal is provided to the filter
circuit,

Filter Change-Over Circuit &Percussion Circuit
Percusston Filter
Filter
Analog Switch
IC2
Chord Filter
K015 CPU
P03 MSM6283
•DIGS
SC LSI 1
(Percussion
sound signal)
Melody Filter
Figure 3
Melody or
<C Bdss sound
signal
Melody sound
signal
Melody or
<Chord sound
signal
^Melody or
Obbligato
sound Signal
The Concerimate 500 has four Envelope/Pitch mixing circuits. In accordance with the mode switch
position, signals P03 and K01 5turn the analog switches on or off so that the sound signals pass
through the appropriate filters.
P03 1K015
NORMAL 'HL
SOLO 1
SOLO 2:
CHORD
1
LH
I
On "NORMAL" mode, all Envelope/Pitch mixing circuits generate melody signals, and the signals
pass through the melody filter. When the mode switch is at the other position, each Envelope/Pitch
circuit creates different sound signals. These signals pass through corresponding filter's.
The percussion signal comes out from the CPU directly, wherever the mode switch position Is set.
As the signal is astepped waveform, the percussion filter shapes it.

Sample Sound Input Circuit
VC
Figure 4. Sample Sound Input Circuit
Sampling
Start
Figure 5. Vin Input Trigger Level
As shown In Fig. 4, the circuit provides sampling signals to pin 100 Vin terminal of the CPU.
By divider circuit of 2pcs of lOOkohm resistors, the sampling signal is biased on 2.5V.
When the sampling sound level exceeds ±0.3 t5V as shown Fig. 5, the CPU starts to transmit
the sampling sound data to the RAMs during the following time.
Sampling time RAM's Capacity (Kbit)
Sampling Data Bit (bit) xSampling Frequency (kHz)
108.544(Kbit)
8(bit) X9.387 (kHz)
s1.4454 Sec.
s1.4 Sec.
While sampling, the CPU doesn't output key common signals (KOO ~K09), so that the keyboard
cannot be operated.