Casio Celviano AP-25 User manual

AP-25/28
ELECTRONIC KEYBOARD
AP-25/28
APR. 2001

— 1 —
CONTENTS
Safety Notice...................................................................................... 1
Specifications .................................................................................... 2
Block Diagram ................................................................................... 3
Replacement of the Keyboard.......................................................... 4
Circuit Description ............................................................................ 6
Exploded View ................................................................................... 7
Parts List ............................................................................................ 9
Schematic Diagrams ....................................................................... 13
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 —
SPECIFICATIONS
GENERAL
Models: AP-25/AP-25V/AP-28/AP-28V
Keyboard: 88 piano keys (with touch response)
Polyphony: 64 notes, maximum
Tones: 8
Digital Effects: Reverb (4 types), Chorus
Demo Tunes: • Number of Tunes: 8
• Playback: Repeat (all tunes, one tune)
Memory: • Operations: Real-time recording, playback
• Capacity: Approximately 2,500 notes (one song)
• Memory Backup: Built-in lithium battery (Battery Life: 5 years)
Pedals: AP-25/AP-25V: Damper, Soft/Sostenuto (Selectable)
AP-28/AP-28V: Damper, Soft, Sostenuto
Other Functions: • Metronome: Beat (6 types), Tempo ( = 30 to 255)
• Touch Select: 3 types, off
• Transpose: 1 octave (F# to C to F)
• Tuning: A4 = 440Hz ±50 cents (adjustable)
MIDI: 16 multi-timbre receive
Input/Output: • Headphones: Stereo standard jacks ×2
Output Impedance: 470Ω
Output Voltage: 18V (RMS) MAX
• MIDI (OUT) (IN)
Speakers: ø 12cm ×2 (Output: 20 W + 20 W)
Power Supply: AP-25/AP-28: 120V
AP-25V/AP-28V: 220-240V
Power Consumption: AP-25/AP-28: 60W
AP-25V/AP-28V: 60W
Dimensions: • CELVIANO (without stand): 137.0 ×42.5 ×19.0 cm (53 15/16 ×16 3/4×7 1/2inch)
• CELVIANO: 139.0 ×47.0 ×81.0 cm (54 3/4×18 1/2×31 7/8inch)
Weight: • CELVIANO (without stand): approximately 34 kg (74.8 lbs)
• CELVIANO: approximately 44 kg (96.8 lbs) (AP-25/AP-25V)
approximately 44 kg (96.8 lbs) (AP-28/AP-28V)
• Design and specifications are subject to change without notice.
• AP-25 and AP-28 have hardwired power cords.
• AP-25V and AP-28V have detachable power cords.

— 3 —
BLOCK DIAGRAM
FI0 ~ 10
SI0 ~ 10
CPU
uPD703107AGJ103UEN
LSI 6
PEDAL
MIDI
IN OUT
ROM (4MB)
MR27V3202E-81MA
LSI2
Keyboard
Controller
TC190C020AF
LSI 1
EA0 ~ 15
MA0 ~ 20
MD0 ~ 15
ED4 ~ 19
Keyboard
KC0 ~ 7
M-IN M-OUT ANI0 ~ 2
DSP
uPD914AGM-3ED
LSI 3
RAM (128KB)
CY62126BVLL-55ZI
LSI4
RAM (128KB)
CY62126BVLL-55ZI
LSI5
CA1 ~ 16
CA1 ~ 5
CA1 ~ 4
3VD0 ~ 15
3VD0 ~ 15
3VD0 ~ 15
Power Switch
Power
Transformer
T101
Voltage
Selector
AVCC
VDD
+15V
+5V
Power Supply
IC401: NJM78M05FA
IC402: NJM78M15FA
Reset IC
RN5VD2BAA
IC 13
D/A Converter
PCM69BU/2K
IC 2
SYCK
BCK
WCK
Mute
Power Amp.
LM4765T
IC403
Main
Volume
Filter
IC1, IC405, IC406
HEADPHONE
SPSP

— 4 —
REPLACEMENT OF THE KEYBOARD
1) Replacement of the white key / black key
2) Replacement of the hammer
3) Replacement of the contact rubber
4) Other precauions
When the the keyboard needs to be replaced, make sure to check the key touch before replacing it.
1) Replacement of the White key / Black key
1. Expand the rear end of the white key/black key by a pair of
tweesers and slide it forward horizontally.
2. Apply proper amount of grease to the inside of the Guide and
the front end of the key as well as the rear end of the key.
* Take extra care of the quantity of the grease, which can easily
change the key touch.
* It is recommended to refer to the quantity of the grease which
is applied to the neighboring keys.
3. After replacing the key, put the front end of the key back into the
Guide and slide it backward horizontally.
* Take extra care not to make any scratches in the inside of the
front end of the key and the Guide.
2) Replacement of the Hammer
1. If no jig is available when disassembling, use a driver and a big clip. Then,
lift the hammer up and remove it like a lever.
2. Apply the grease (G501) thinly to the top and bottom of the front end as
well as the fulcrum of the hammer.
* It is recommended to refer to the quantity of the grease which is applied
to the other hammers when disassembling.
Guide
White key
Grease
Clip
Driver
Grease

— 5 —
Jig (lumber)
10 mm ×10 mm
Guide
White key
Screw
Contact rubber
PCB
100 g
105 g
3) Replacement of the contact rubber. (A Jig is necessary)
Since the contact rubber is replaced with the keyboard (both
white keys and black keys) turned upside down, a jig is necessary
to prevent from various troubles caused by the fact that the keys
are pushed down.
Precautions when replacing the contact rubber
1. Make sure that the keys are NOT pushed down.
2. Make sure that the contact rubber is attached to the frame in the right
position.
3. When assembling, take extra care that the contact rubber can often
be slipped or twisted at the ends of the rubber itself and the PCB.
4. Make sure that the screw is fixed vertically to the PCB since the key
PCB is fixed at an angle (see the right figure).
5. The key touch may change if the above precauions are not followed.
4) Other precautions
Initial load inspection of the keyboard
1. Check if the keys go down with the load put on them (100g for the white key and 105g for the black key).
Maintenance of the keyboard unit
1. Never keep the keyboard unit upside down, since the contact rubber may
be stuck to the PCB.

— 6 —
CIRCUIT DESCRIPTION
KEY MATRIX
KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7
FI0 A0 1 A0 # 1 B0 1 C1 1 C1 # 1 D1 1 D1 # 1 E1 1
SI0 A0 2 A0 # 2 B0 2 C1 2 C1 # 2 D1 2 D1 # 2 E1 2
EI1 F1 1 F1 # 1 G1 1 G1 # 1 A1 1 A1 # 1 B1 1 C2 1
SI1 F1 2 F1 # 2 G1 2 G1 # 2 A1 2 A1 # 2 B1 2 C2 2
FI2 C2 # 1 D2 1 D2 # 1 E2 1 F2 1 F2 # 1 G2 1 G2 # 1
SI2 C2 # 2 D2 2 D2 # 2 E2 2 F2 2 F2 # 2 G2 2 G2 # 2
FI3 A2 1 A2 # 1 B2 1 C3 1 C3 # 1 D3 1 D3 # 1 E3 1
SI3 A2 2 A2 # 2 B2 2 C3 2 C3 # 2 D3 2 D3 # 2 E3 2
FI4 F3 1 F3 # 1 G3 1 G3 # 1 A3 1 A3 # 1 B3 1 C4 1
SI4 F3 2 F3 # 2 G3 2 G3 # 2 A3 2 A3 # 2 B3 2 C4 2
FI5 C4 # 1 D4 1 D4 # 1 E4 1 F4 1 F4 # 1 G4 1 G4 # 1
SI5 C4 # 2 D4 2 D4 # 2 E4 2 F4 2 F4 # 2 G4 2 G4 # 2
FI6 A4 1 A4 # 1 B4 1 C5 1 C5 # 1 D5 1 D5 # 1 E5 1
SI6 A4 2 A4 # 2 B4 2 C5 2 C5 # 2 D5 2 D5 # 2 E5 2
FI7 F5 1 F5 # 1 G5 1 G5 # 1 A5 1 A5 # 1 B5 1 C6 1
SI7 F5 2 F5 # 2 G5 2 G5 # 2 A5 2 A5 # 2 B5 2 C6 2
FI8 C6 # 1 D6 1 D6 # 1 E6 1 F6 1 F6 # 1 G6 1 G6 # 1
SI8 C6 # 2 D6 2 D6 # 2 E6 2 F6 2 F6 # 2 G6 2 G6 # 2
FI9 A6 1 A6 # 1 B6 1 C7 1 C7 # 1 D7 1 D7 # 1 E7 1
SI9 A6 2 A6 # 2 B6 2 C7 2 C7 # 2 D7 2 D7 # 2 E7 2
FI10 F7 1 F7 # 1 G7 1 G7 # 1 A7 1 A7 # 1 B7 1 C8 1
SI10 F7 2 F7 # 2 G7 2 G7 # 2 A7 2 A7 # 2 B7 2 C8 2
FI
KC
SI
LSI
HG52E35P
Second contact First contact
1
2

— 7 —
EXPLODED VIEW
CABINET
1
14
26
27
2
3
8
9
9
16
28
10
24 11 17
23
4
13 12
7
6
5
40
41
42
15
18 19 2021
22
25
37
39
39
43
46
44
36
47
45
38

— 8 —
STAND
x2
x2
x4
x2
x1
x14
x2
x2
34
32 33 35
29 30 31

Notes: This parts list does not include the cosmetic parts, which
parts are marked with item No. "R-X" in the exploded
view.
Contact our spare parts department if you need these
parts for refurbish.
1. Prices and specifications are subject to change with-
out prior notice.
2. As for spare parts order and supply, refer to the
"GUIDEBOOK for Spare parts Supply", published
seperately.
3. The numbers in item column correspond to the same
numbers in drawing.
PARTS LIST
AP-25/28