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.

ROM St RAM Accesses
RAM (1) and RAM (2) are dynamic 64Kbit RAM. Since they are dynamic type, data should be
refreshed every 2msec. at least. The memory is used as the demonstration, memory play, and
sampling data area.
The chip select condition and memory assignments are as shown below.
Chip^\
I1
A15
'1
CE
1
OE 1 Memory Assignment
RAM (1) 11
1H,
11
1(LSB)
L
22.528 bit (MSB)
L1u
1Demonstration/Memory play 1Sampling
1
RAM {2) 1
1
11
1
1 1
{LSB) 65,536 bit (MSB)
Sampling
RAM (1) cannot record demonstration data and memory play data at the same time.

The capacity of ROM is 256 Kbit and contains the program for system execution.
The chip select condition is as shown below.
Power Supply Circuit
The power supply circuit has avoltage regulator and an APO (Auto Power Off) circuit.
When power is ON and at the normal operation, the APO signal from the CPU keeps "H" level.
Transistors T4 and T8 turn on, so that voltages VH, VLl, VL2 and VE are provided to the
circuits.
When the keyboard is not operated for seven minutes, the APO signal becomes "L" level.
Transistors T4 -T8 turn off causing the voltages to shut off.
Voltages VA (5V) and VDD1 (ground) are always provided to the CPU even at the APO.
Transistors T1 ,T2 and T3 form avoltage regulator. Using the LEDs characteristic of current
regulation, T1 stabilizes the battery voltage at 5V and the darlington-connected T2 and T3
amplifies the current.

Reset Circuit
VAI5V)
GND Figure 8
Voltage VA
(Point®!
Preset Signal
(Point®)
Figure 9
At power ON, the waveform of point 2provides apulse by the differential circuit of resistor R
and capacitor C.
The pulse initializes the internal circuits of the CPU.

MAJOR WAVEFORMS
Attenuation of probe is 10 :
1
Checkpoints: Refer to the PC8 View on page 17.
^^Clock Pulse Signal
0,1V/div, 0.1 mS/<Jiv
Reset Signal
0-2V/div, 2mS/div
Pitch Signal tor Piute
50mV/div, 0-5mS/div
Envelope Signal for Flute
2mV/div. 0.5mS/div
Percussion Signal
SOmV/div, 5mS/div
Rhythm: Rock. Tempo: Maximum
Envelope/Pitch Mixing Signal
20mV/div. SmS/div
Tone: Flute. Key: C3
Tone: Flute, Key: C3

Refresh Signal
0.2V/d(v, lO^iS/dlv
0CE Signal
0.2V/div, 10^S/div
Tone; Sampling, Key: G3
Key Common Signal KOO
0-2V/div, 0.5mS/div
@Key Input Signal KI8
0-2V/div, 0.5mS/div

TROUBLESHOOTING
Trouble Checkpoints and Possible Cause
Does not work at all
(Pilot lamp does not
light)
•Check the voltages VA (+SV), VE (+3.35V), VC (+5V) and
VD (+5V).
•Check the reset and APO signals.
•Faulty parts: Transistors Tt Power switch, or CPU
(LSI 1).
Does not work at all
(Pilot lamp lights)
•Check the voltages VH (+7.5V), VC (+5V) and VD (+5V).
•Check the clock pulse and key common signals.
•Faulty parts: Transistors T5 T8. Ceramic Trimmer
VCT84K.or ROM (LSI 4).
1
'1
Preset tone does not 1
sound on PLAY mode •Check the voltage VH (+7.5V).
•Check the analog signal at base of transistor T1 1or Power
amp. (IC1).
•Faulty parts: Transistors T7 T9, Til, CPU (LSI Dor
Power Amp. (ICl).
Chord or Bass tone
does not sound on
C)HORD mode
•Check the analog signal at collector of transistor T18 or T23.
•Check the analog signal at source of FET TIO.
•Faulty parts: Transistors T18 “*'T23, TIO, or Analog
Switch (IC2).
Melody or Obbligato
tone does not sound
on SOLO 1or SOLO
2mode
•Check the analog signal at collector of transistor T13 or T17.
and at emitter of transistor Til.
•Faulty parts: Transistors T12 T17 or T1 1.
Memory/Oemo play
does not perform
•Faulty pans; RAM 1(LSI 4), ROM (LSI 2). CPU (LSI Dor
Chip Selector (IC3).
Sampling impossible •Check the analog signal at collector of transistor T25 at
sampling time.
•Check the vol tage (2.5 V)of pin 100 of the CPU {LSI 1).
•Faulty parts: Transistors T24, T25. CPU (LSI 1). RAM 1
(LSI 4) or Chip Selector (IC3).
Distorted sound •Faulty parts: Transistors T1 2T20, T9, or Power Amp.
(ICl).
Acertain key or switch
does not respond
•Check the contacts of PC joirter or contact rubber.
•Clean the contacts on the keys and the switches.
Percussions do not
sound
•Chedc the analog signal at pin 97 of the CPU.
•Check the poor soldering on pin 97 of the CPU.
•Faulty parts: CPU (LSI 1).
Reference Waveform
Waveform @
Waveforms @
Waveform(^
Waveform @

PCB
{Top
«id
Bottom
V«w&)

ELECTRICAL PARTS LIST
Ref. No. Description Radio Shack
Part Number Manufacturer's Part Number
Capacitors
Cl Electrolytic 2200pF 16V ±20% CC-228MBOA 2804 9731
C2 Electrolytic 2.2pF 50V ±20% CC-225MJBA 2804 5336
C3 Electrolytic 47^F 10V ±20% CC476MCBA 2804 5069 .
C4,C5 Semiconductive 0-0 Ip F25V ±10% CC-103KFBZ 0002 8903
C6 Mylar* 0.1 5pF 50V ±10% CC-164KFB2 2830 6067
C7 Electrolytic 220pF 10V ±20% CC-227MCBA 2804 5140
C8 Ceramic 150pF 50V ±10% CC-151KJBC 2818 0039
C9 Ceramic 220pF 50V ±10%
1
CC-221JJBC 2819 0107
CIO Electrolytic lOOpF 10V ±20% '
1
CC-107MCBA 2804 4879
cn Electrolytic 47pF 10V ±20% CC-476MCBA 2804 5069
C12,C13 Electrolytic lOOpF 16V ±20% 2804 4933
C14'-C16 Electrolytic 50V ±20% CC-105MJBA 2804 4925
C17 Electrolytic 330pF 6.3V ±20% CC-337MBDA 2804 5808
C18 Semiconductive O.lpF 16V ±10% CC104M0CZ 0002 9177
C19
1
Electrolytic 2.2pF 50V ±20% CC-225MJBA 2804 5336
C20, C21 ,Semiconductive 0-047pF 16V ±10% CC-473KOCZ !0002 9178
C22, C23 Semiconductive O.lpF 16V 110% CC-104MDCZ 0002 9177
C24 Ceramic 56pF 50V ±5% CC-560JJBC 2819 0344
C26 1Ceramic ISOpF 60V ±5% CC151JJBC 2819 0654
C26 !Ceramic lOOpF 50V ?5% CC-101JJBC 2818 3054
C27 Semiconductive O.lpF 16V ±10% CC-104MDCZ 0002 9177
C28 Electrolytic lOpF 16V ±20%
1
CC-106MDCA 2804 5051
C29. C30 Semiconductive O.OlpF 25V ±10% CC'103KFB2 0002 8903
C3LC32 Semiconductive O.lpF 16V ±10% 1
CC-104MDC2 0002 9177
C33 Electrolytic lOOpF 6.3V ±20% CC-107MBOA 2804 9374
C34 Semiconductive O.lpF 16V ±10% CC-104MDC2 0002 9177
C35 Semiconductive O.OlpF 25V ±10% CC-103KFBZ 0002 8903
C36 Semiconductive lOOOpF 25V ±10% CC102KFB2 0002 8898
C37 Semiconductive 6800pF 25V ±10% CC-682KFB2 0002 9179
C38, Semiconductive 0.047pF 16V ±10% CC-473KDCZ 10002 9178
C39 Semiconductive O.lpF 16V ±10% CC-104MDCZ 0002 9177
C40 Electrolytic IpF 50V ±20% CC-105MJBA 2804 4925
C41 Semiconductive O.lpF 16V ±10% CC-104MDCZ 0002 9177
C42 Semiconductive 0.047pF 16V ±10% CC-473KOC2 0002 9178
C43 Semiconductive O.lpF 16V ±10% CC-104MDC2 0002 9177
C44 Electrolytic IpF 50V ±20% CC-105MJBA 2804 4925
C45 Semiconducti ve O.lpF 16V ±10% CC-104MDC2 0002 9177
*Mylar is aregistered trademark of E.l. Du Pont de Nemours and Company.

Ref. No. Description Radio Shack
Part Number Manufacturer's Part Number
C46 Semiconductive 0.047pF 16V ±10% CC-473KDCZ 0002 9178
C47 Semiconductive O.lyF 16V ±10% CC-104MOC2 0002 9177
C48 Electrolytic imF 50V ±20% CC-105MJBA 2804 4925
1
C49 Semiconductive O.lpF 16V ±10%
]CC-104MDCZ
1
!0002 9177
CSO Semiconductive 0.047;^F 16V ±10% CC-473KOCZ 0002 9178
C51 ,Semiconductive 0.1*iF 16V ±10% CC-104MDCZ 10002 9177,
C52 1Electrolytic 1*iF 50V ±20% CC-105MJBA 2804 4925
C53, C54 Semiconduct ive
1
OAiiF 16V ±10% CC-104MDCZ 0002 9177
C55
^
Electrolytic 16V ±20%
1
CC-106MOCA 2804 5051
C56, C57 Semicond uctive
1
0^^xf 16V ±10% CC-104MDCZ 0002 9177
C58 Semiconductive 0.022^F 26V ±10% CC-223KFBZ 0002 8894
C59 Ceramic lOOOpF 50V ±10% CC-102KJBC 2818 0110
C60 Semiconductive 0.022pF 25V ±10% CC-223KFBZ 0002 8894
C61 Electrolytic lOO^F 6.3V ±20% CC-107M60A 2604 9374
062 Ceramic lOOOpF 50V ±10% CC-102KJBC 2818 0110
063, 064 Semiconductive 0.047*iF 16V ±10% CC473KDCZ 0002 9178
065 Ceramic lOOOpF 50V ±10% CC-102KJBC 28180110
066 Electrolytic
1
lOO^iF 6.3V ±20% CC-107MBDA 2804 9374
067 Electrolytic 220^F 6.3V ±20% CC-227MBOA 2804 5638
068, 069
^
SemiCOr>d uctive O.O^F 25V ±10% CC103KFBZ 0002 8903
1
Coils
LI :Oscillator. L10-495 CA-99S1 3841 0695
L2, L3 Noise Filter, ELE-H821KA 3841 0154
Diodes
D1-D56 Silicon, 1S254 OX-0808 0002 8721
ICs
IC1 Amp., Power, Linear LA4138 MX-6210 2120 8329
iC2 Switch, Analog. MOS. TC50H4066P MX-7302 2100 5045
103 Gate. NOR. MOS, TC74HC02P MX-7301 2100 4669
Jacks
J1 Power. HEC 0470 01 -230 3512 3288
J2, J3 Phone, YKB21-5101 J-1797 3612 0665
J4 Mic., YKB21-5006 J-1798 3612 0711
1
LEDs
LED1 Regulator, Voltage, LN2G
LED2 Lamp. Pilot, LN251RPPWE
2320 9619
2320 9764