(with price)
AP-20
ELECTRONIC KEYBOARD
CONTENTS |
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Safety Notice ...................................................................................... |
2 |
Specifications .................................................................................... |
3 |
Block Diagram ................................................................................... |
4 |
PCB Layout ........................................................................................ |
5 |
Disassembly Instructions ................................................................. |
6 |
Circuit Description .......................................................................... |
10 |
Major Waveforms ............................................................................. |
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Troubleshooting .............................................................................. |
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Wiring Diagram ................................................................................ |
17 |
Exploded View ................................................................................. |
18 |
Parts List .......................................................................................... |
21 |
Schematic Diagrams ....................................................................... |
23 |
SAFETY NOTICE
CAUTION!
Danger of explosion if battery is incorrectly replaced. Replace only with the same of equivalent type recommended by the appliance manufacturer.Discard used batteries according to manufacturer's instructions.
— 2 —
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SPECIFICATIONS |
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GENERAL |
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Number of keys |
88 |
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Polyphonic: |
32-note |
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Preset tones: |
10, PIANO 1, PIANO 2, ELEC. PIANO, HARPSICHORD, VIBRAPHONE, |
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PIPE ORGAN, STRINGS, CHOIR, W.BASS (Lower tone only), |
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E.BASS (Lower tone only) |
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Layer/Split function |
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Key transpose: |
F#-C-F |
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Keyboard controls: |
Tuning curve, Baroque pitch |
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Temperaments: |
Equal Temperament, Kirnberger III, Werckmeister, Mean-Tone, |
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Just Intonation (Minor/Major), Pythagorean System |
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Effects: |
Reverb (Room, Stage, Hall 1, Hall 2)/Chorus/Tremolo/Brilliance |
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Demo tunes: |
8, |
1. Polonaise "Héroïque" (F.F. Chopin) |
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2. |
Frühlingslied Op. 62-6 (F. Mendelssohn) |
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3. |
CASIO original |
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4. |
Harmonious blacksmith (G.F. Händel) |
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5. |
CASIO original |
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6. |
Jesus, Bleibet Meine Freude (J.S. Bach) |
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7. |
CASIO original |
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8. |
CASIO original |
Memory: |
Number of Songs: |
2 (A and B) |
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System: |
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Real-time recording |
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Memory Capacity: |
Approximately 3,000 notes total |
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Memory Backup Battery: |
Built-in lithium battery |
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Battery Life: Approximately 5 years |
Pedals: |
Soft, Sostenuto, Damper |
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Tuning control: |
440Hz ±50 cents |
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Built-In Speakers: |
16 cm dia. x 2 (Output: approx. 20 W + 20 W) |
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MIDI: |
16-channel, multi-timbral reception |
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Terminals: |
PHONES 1 and 2, MIDI (IN/OUT/THRU), LINE OUT L and R (Output Imped- |
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ance: 10 KΩ; Output Voltage: 2 V, RMS, max.), LINE IN R and L (Input Imped- |
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ance: 20 KΩ, Input sensitivity: 200 mV) |
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Power source: |
120V (for U.S.A.), |
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120V, 220V, 230V and 240V (for other countries) |
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Power consumption: |
65W (with 120V AC), 55W (with 220V, 230V and 240V AC) |
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Dimensions (HWD): |
Without stand: |
185 × 1340 × 520 mm (7-5/16 × 52-13/16 × 20-1/2 inches) |
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With stand: |
820 × 1360 × 550 mm (32-5/16 × 53-9/16 × 21-11/16 inches) |
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Weight: |
Without stand: |
35.5 kg (78.3 lbs)/38.5 kg (84.0 lbs) |
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With stand: |
45.5 kg (100.4 lbs)/48.5 kg (106.1 lbs) |
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Note: There are two models of AP-20, one has a keyboard cover, the other has no keyboard cover.
— 3 —
RAM 256K HM62256BLP-10
ROM 1M
MX23C1010PC12CA25
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AVCC |
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AVDD |
AVFF |
VDD |
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+12V |
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+5V |
–12V |
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+5V |
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Voltage Regulator |
M5F78M12L × 2 |
M527BL05 |
T8, T9 |
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Power Switch T101 |
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Power Transformer |
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BLOCK DIAGRAM
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MIDI |
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KC0 ~ 7 Keyboard |
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IN |
OUT |
P70 ~ |
Keyboard |
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PEDAL |
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P77 |
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SF |
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Controller |
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MIDI |
MIDO |
HG52E35P |
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SS |
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DP |
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FI0 ~ 10 |
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P12 ~ |
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SI0 ~ 10 |
Switches |
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BRILLIANCE |
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P14 |
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KC0 ~ 4 |
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CPU |
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Switch & LED |
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HD6435328RC13F |
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Controller |
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µPD65005GF-419 KI0 ~ 3 |
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L1 ~ 9 |
LEDs |
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D0 ~ 7 |
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LA ~ J |
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RST |
Reset IC |
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A0 ~ 14 |
MUTE |
MB3771P |
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A0 ~ 3 |
RA0 ~ 19 |
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ROM |
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RD0 ~ 15 |
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8M + 16M |
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HN62418PD25 |
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DSP |
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HN624116D44 |
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HG51B155FD |
EA0 ~ 14 |
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RAM |
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ED0 ~ 15 |
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256K × 2 |
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HM65256BLSP- |
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10 × 2 |
SOLM, SOLP |
BDK, WOK1, SORM, SORP |
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D/A Converter |
D/A Converter |
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µPD6376CX |
µPD6376CX |
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Filter |
Filter |
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Main |
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Volume |
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LINE IN
Mixer, Mute Circuit
T6, T7, T10, T11
Power Amp.
STK4132MK
— 4 —
PCB LAYOUT
MA2M
PS1 MA1M
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IF1M |
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HALL 2 |
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CONTROL |
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VOLUME |
BRILLIANCE |
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TONE |
LOWER TONE |
REVERB |
MEMORY |
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TUNE |
DEMO |
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HALL 1 |
TREMOLO |
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CN3M |
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ON |
MIN |
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MAX MELLOW |
BRIGHT PIANO 1 |
PIANO 2 |
E.PIANO HARPSICHORD VIBRAPHONE PIPE ORGAN STRINGS CHOIR |
W.BASS E.BASS |
STAGE |
CHORUS |
START/ |
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OFF |
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SONG A SONG B RECORD STOP |
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POWER |
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CN2M |
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CN1M ROOM |
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TP10-KY1M |
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TP10-KY2M |
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MA4M MA5M |
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Note: IF1M PCB is a terminal board for the keyboard PCBs, and included in the main PCB.
PCB |
JCM433- |
Components |
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Main PCB |
MA1M |
CPU, DSP, Sound Source ROM Working storage |
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RAM, Effect RAM Reset IC, DAC, Filter, Key con- |
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troller, Power amp, Power supply circuit |
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Jack PCBs |
MA2M |
LINE IN/OUT jack, MIDI jacks |
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MA4M |
Phone jacks |
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MA5M |
Power indicator |
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Console PCBs |
CN1M |
Gate array (Button controller/LED driver), LEDs, |
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Buttons |
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CN2M |
Main Volume, Brilliance volume |
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CN3M |
Tune Buttons, Demo button |
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Power PCB |
PS1 |
Fuse, Noise filter |
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— 5 —
DISASSEMBLY INSTRUCTIONS
1. Disassembling top board
1-1. Remove 8 screws on the rear.
1-2. Slide the top board towards the rear.
The top board will be free from catches on the case.
1-3. Lift the top board.
For keyboard-cover model
2. Disassembling keyboard cover
2-1. Slide the keyboard cover to open fully. 2-2. Passing the gear into the opening on each
rack, lift the keyboard cover.
For no-keyboard-cover model
2. Disassembling the front cover
2-1. Remove 4 screws at both ends of the front cover. 2-2. Remove the front cover.
— 6 —
3. Disassembling console panel
Note: To avoid scratch on the side board, put paper between the console panel and the side board at both ends.
3-1. The console panel is fixed with screws and nuts. Holding the nut, remove the screw.
3-2. Remove the screw fixing a grounding wire at the transformer. 3-3. Slide the console panel towards the front to free from catches. 3-4. Turn round the console panel.
3-5. Remove the 2 screws fixing the power switch.
Insert paper here.
Insert paper here.
4. Disassembling front cover
4-1. Remove 5 screws at the front edge on the bottom.
4-2. Disconnect the connector for phone jacks from the main PCB.
4-3. Watching the phone-jack cable, pull out the front cover towards the front.
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5. Disassembling keyboard unit
5-1. Remove 6 screws at both ends on the bottom, and a screw at the middle.
5-2. Remove 2 screws at both ends of keyboard unit.
5-3. Disconnect 2 connectors for the keyboard unit from the main PCB.
5-4. Moving the keyboard unit towards the front, remove the unit from the case.
6. Disassembling keys
6-1. Peel the red felt and sponges off the keyboard unit. 6-2. Using a long-nose plier, remove key springs.
6-3. Pressing the hook with a long-nose plier. Lift the key.
— 8 —
7. Disassembling keyboard PCBs
7-1. Turn round the keyboard unit to face the PCB up.
7-2. Disconnect the connector at the middle of keyboard.
7-3. Remove screws on the keyboard PCBs.
8. Replacing the main PCB
Note: The main PCB contains a lithium battery for memory back-up. Please remove the jumper before replacing the PCB. And make sure that the jumper is reset on new main PCB after replacing the PCB. Because no jumper is set on a spare part of the main PCB.
Jumper
— 9 —
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