Casio CTK-100 User manual

(with price)
CTK-100
ELECTRONIC KEYBOARD
R
CTK-100

CONTENTS
SPECIFICATIONS.......................................................................................................... 1
BLOCK DIAGRAM ......................................................................................................... 2
CIRCUIT DESCRIPTION ................................................................................................ 3
TROUBLESHOOTING.................................................................................................... 5
IC AND TRANSISTOR LEAD IDENTIFICATIONS ........................................................ 6
SCHEMATIC DIAGRAMS .............................................................................................. 7
PCB VIEW & MAJOR WAVEFORMS............................................................................ 8
EXPLODED VIEW ........................................................................................................ 10
PARTS LIST ................................................................................................................. 11

— 1 —
SPECIFICATIONS
Electrical
Current Drain with 9V DC:
No Sound Output 47 mA ±20%
Maximum Volume 413 mA ±20%
with keys C2, D2, E2 and F2 pressed in
Car-Horn tone, Volume; Maximum
Output Level (Vrms with 8 Ωload each channel): 76 mV ±20%
with key G2 pressed in Street Organ tone
Speaker Input Level: 935 mV ±20%
with key G2 pressed in Street Organ tone
Minimum Operating Voltage: 6.0 V
General
Number of Keys: 49
Polyphonic: 8-note
Preset Tones: 100
Auto-Rhythms: 100
Auto-Accompaniment: CASIO Chord/Fingered
Demonstration Tune: Classical Medley
Built-In Speakers: 10 cm dia. 1.0W Input Rating: 2 pcs.
Terminals: Output Jack [Output Impedance: 120 Ω, Output Voltage: 3 V (rms)MAX],
AC Adapter Jack (DC 9 V)
Power Source: 3-way AC or DC source
AC: AC adapter AD-5
DC: 6 AA size dry batteries
Battery life: Approx. 3 hours (SUM-3/R6P)
Approx. 6 hours (AM-3/LR6)
Power Consumption: 5.0 W
Dimentions: 86 x 857 x 285 mm (HWD)
(3-3/8 x 33-3/4 x 11-1/4 inches) (HWD)
Weight: 3.2 kg (7.0 lbs) excluding batteries
Standard Accessory: Music stand

— 2 —
BLOCK DIAGRAM
KO0~KO9
KI0~KI7
Keyboard
Switches
Oscillator
VDD +5V
Power supply circuit
VC +9V
Amplifier
Speakers
Output Jack
LA4598 Filter
T3/T4
CPU
MSM6387-13
Main Volume
T2

— 3 —
0IK1IK2IK3IK4IK5IK6IK7IK
0OK
)1CK( 01 2C2#C2D2#D2E2F
1OK
)2CK( 23 2#F2G2#G2A2#A2B
2OK
)3CK( 45 3C3#C3D3#D3E3F
3OK
)4CK( 67 3#F3G3#G3A3#A3B
4OK
)5CK( 89 4C4#C4D4#D4E4F
5OK
)6CK( enoTmhtyhR4#F4G4#G4A4#A4B
6OK
)7CK( opmeT pU opmeT nwoD 5C5#C5D5#D5E5F
7OK
)8CK( /tratS potS nI-lliF5#F5G5#G5A5#A5B
8OK
)9CK( omeD6C
.pmoccA
1emuloV
)niM(
.pmoccA
2emuloV
.pmoccA
3emuloV
.pmoccA
4emuloV
)xaM(
9OK rewoP
FFO
lamroNderegniFOISAC
drohC
CIRCUIT DESCRIPTION
Key and Switch Matrix
Nomenclature of Keys
F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5
F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6
D#3
C#3A#2G#2F#2
D#2
C#2
C2 D2 E2 F2 G2 A2 B2 C3 D3 E3

— 4 —
CPU (MSM6387-13)
The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides a sound
waveform in accordance with the pressed key and the selected tone.
The following table shows the pin functions of the CPU.
Filter Block
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the
waveform.
From CPU
To main volume
Pin No. Terminal In/ Out Function
1, 2 TEST1, TEST2 Not used. Connected to ground.
3 RESET In Power ON reset terminal. When the power switch is turned on, the terminal receives a low level signal and
the internal circuits of the LSI are initialized.
4 AVDD In +5 V sorce for the built-in DAC
5 OUT Out Sound waveform output
6 AGND In Ground (0 V) source for the built-in DAC
7 GND In Ground (0 V) source
8, 9 COSI, COSO In/Out 21.725 MHz clock pulse input/output
10 VDD In +5 V source
11 ~ 18 KI0 ~ KI7 In Input terminal from keys and switches
19, 20 KO11, KO10 Not used.
21 ~ 30 KO9 ~ KO0 Out Key and switch scan signal output
VDD
C273(H) C473(H)
3.3K 1K 2.2K
C333(H)
T4
T3
2SC1740SQ
1K
150K
1.5K
120K
1K
C822(H)
C823(H)
AG AG AG
AG AG
2SC1740SQ

— 5 —
Power Amplifier (LA4598)
The power amplifier is a 2-channel power amplifier with a standby switch.
The following table shows the pin functions of the power amplifier.
TROUBLESHOOTING
Nature of Trouble Faulty Block Checkpoint
No power Power Supply Circuit Emitter of T2 should provide +5.5 V.
Base of T2 should receive +6 V.
Power Jack Jack contact.
No sound at all Power Amp. (LA4598) Pin 9 should receive +9 V when the
power switch is turned on.
Check output signals of pins 3 and 12.
CPU (MSM6387-13) Pins 21 ~ 30 should provide pulses.
Pin 5 should have a sound signal when
keys are pressed.
Oscillator Pins 8 and 9 of the CPU should receive
an ocsillation signal.
A certain key or switch
does not function Key and Switch Matrix Dust on the contact.
Certain keys or switches
do not function Key and Switch Matrix Open circuit on KC or KI line.
Pin No. Terminal In/Out Functiion
1 Power GND Ground (0 V) source
2 Ch1 B.S. Out Terminal for a bootstrap capacitor
3 Ch1 OUT In Channel1 output
4 VCC In +9 V source. Connected to the power source directly.
5 Ch1 N.F. In Negative feedback input
6 Ch1 IN In Channel1 input
7 D.C. Terminal for a decoupling capacitor
8 Pre GND In Ground (0 V) source
9 Standby In Power control signal input. 0 V: OFF, +9 V: ON
10 Ch2 IN In Channel2 input
11 Ch2 N.F. In Negative feedback input
12 Ch2 OUT Out Channel2 output
13 Ch2 B.S. Terminal for a bootstrap capacitor
14 NC Not used.

— 6 —
IC AND TRANSISTOR LEAD IDENTIFICATION
T3, T4: 2SC1740SQ T2: 2SD2008Q,R
LA4598
30 29 28 24 27 26 25 23 22 21 20 19 18 17 16
TEST2
TEST1 RESET GND AVDD OUT AGND COSI COSO VDD KI0 KI1 KI2 KI3 KI4
1 2 3 7 4 5 6 8 9
10 11 12 13 14 15
KO0 KO1 KO2 KO6 KO3 KO4 KO5 KO7 KO8 KO9
KO10 KO11
KI7 KI6 KI5
BCE B
C
E
Power GND
Ch1 B.S.
Ch1 OUT
VCC
Ch1 N.F.
Ch1 IN
D.C.
Pre GND
Standby
Ch2 IN
Ch2 N.F.
Ch2 OUT
Ch2 B.S.
1 2 3 4 5 6 7 8 9 10 11 12 13
MSM6387-13

— 7 —
SCHEMATIC DIAGRAMS
Keyboard PCBs M496K-KY1M, KY2M

— 8 —
PCB VIEW and MAJOR WAVEFORMS
5671432