Casio SA-65 Service Manual
SA-65
POWER
ON
OFF
VOLUME
START/STOP MELODY OFF
MUSICAL INFORMATION SYSTEM
VOLUME
TEMPO
TONE
PATTERN
SONG BANK
TEMPO
78 9
TONE
45 6
PATTERN
1023
SONG
BANK
10 SONG BANK
SA-65
ELECTRONIC KEYBOARD
CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Printed Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 7
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SPECIFICATIONS
GENERAL
Keyboard: 37 keys, 3 octaves (mini-size)
Polyphony: 4 notes maximum
Tones: 100
Patterns: 30 (RHYTHM, FREE SESSION, FUNNY)
Song band: 10 tunes; melody off
Tuning: Fixed; A4 = approx. 442 Hz
Speakers: Two; 8.0cm (output: 0.5 W + 0.5 W)
Input terminals: AC adaptor (7.5 V DC)
Power supply: Two-way
Five AA-size batteries
Battery Life: Approximately six hours on R6P (SUM-3) manganese batteries
AC Adaptor (AD-1)
Power consumption: 7.5 V 2.3 W
Dimensions (HWD): 74 × 650 × 211 mm
(2-15/16 × 25-5/8 × 8-5/16 inches)
Weight: Approximately 1.6 kg (3.53 lbs) (without batteries)
ELECTRICAL
Current drain with 7.5 V DC:
No sound output 33 mA ± 20 %
Maximum volume 230 mA ± 20 %
with keys G3, A#3, B3 and C4 pressed
in Car Horn tone, Volume: Maximum
Speaker output level 1060 mV ± 20 %
with key C2 pressed in Street Organ tone
Volume: Maximum
Minimum operating voltage: 5.5 V
Nomenclature of Keys
C#3
D#3 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
C3 D3 E3 F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6
— 1 —
BLOCK DIAGRAM
S1 ~ S14
S18 ~ S20
S31 ~ S46
Speaker
LCD
LCD Driver
KS0035
IC102
Amplifier
AN8053N
IC101
COM1, COM2
KO8 ~ KO11
Filter
Q101
VDD
CPU
MSM6387B-A28
LSI101
OUT
Oscillator
Q102, X101
KO0 ~ KO7
KI0 ~ KI7
Keyboard
Switches
CIRCUIT DESCRIPTION
Key Matrix
KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7
KO0 C3 C#3 D3 D#3 E3
KO1 F3 F#3 G3 G#3 A3 A#3 B3 C4
KO2 C#4 D4 D#4 E4 F4 F#4 G4 G#4
KO3 A4 A#4 B4 C5 C#5 D5 D#5 E5
KO4 F5 F#5 G5 G#5 A5 A#5 B5 C6
KO5 0 1 23 4
KO6 5 6789
KO7
Song
Bank Stop Down
Pattern Tone
Tempo
Volume
Start/ Volume
Up Off
Up Down
Melody
Tempo
— 2 —
CPU (LSI101: MSM6387B-A28)
Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound waveform
in accodance with the pressed key and the selected tone.
The following table shows the pin functions of LSI101.
Pin No. Terminal In/Out Function
1, 2 TEST1, TEST2
3 RESET In Power ON reset terminal. On: +5 V Off: 0 V
4 AVDD In +5 V source 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 COSI In 21.725 MHz clock pulse input
9 COSO
10 VDD In +5 V source
11 ~ 18 KI0 ~ KI7 In Input terminals from keys and switches
19 KO11 Out Display data output
20 KO10 Out Bit clock output
21 KO9 Out Chip enable signal for the LCD driver
22 KO8 Out Display blanking output
23 ~ 30 KO7 ~ KO0 Out Key scan signal outputs
—
—
Not used. Connected to ground.
Not used
LCD Driver (IC102 : KS0035)
The KS0035 is an LCD driver for a segment type LCD, and it can drive up to 53 segments.
The following table shows the pin functions of IC102.
Pin No. Terminal In/Out Function
1 ~ 14 S1 ~ S14 Out Segment output
15 ~ 17 S15 ~ S17
18 ~ 20 S18 ~ S20 Out Segment output
21 ~ 30 S21 ~ S29
31 ~ 47 S30 ~ S46 Out Segment output
36 S35
48 ~ 54 S47 ~ S53
55 OSC In Terminal for the internal clock generator
56 VDD In +5 V source
57 –INH In Display blanking input
58 VLCD In +5 V source for the internal driver
59 VSS In Ground (0 V) source
60 CE In Chip enable input
61 CLK In Bit clock input
62 DATA In Display data input
63, 64 COM1, COM2 Out Common out put
—
—
—
—
Not used
Not used
Not used
Not used
— 3 —
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