Casio WK-1800 Service Manual
WK-1800
INDEX
MAY.2000
FULL RANGE
CHORD
MAX
FINGERED
CASIO CHORD
MIN
SONG
PATTERN
EXTERNAL
CH 4
CH 5
CH 6
CH 7
CH 8
CH 9
CH 10
CH 11
CH 12
CH 13
CH 14
CH 15
CH 1
CH 2
CH 3
INTERNAL
ACC VOL.
CHORD1
CHORD2
CHORD3
BASS
UPPER1
UPPER2
LOWER1
RHYTHM
LOWER2
CH 16
PARAMETER RESET:
MAIN MANU/
TR1
CHANNEL VOLUME:
TR2
TR3
TR4
TR5
TR6
SUB MANU/
CHANNEL SELECT:
STOREBANK
789
456
1023
DELETE
AMP ENVELOPE
DECAY
SUSTAIN
PITCH ENVELOPE
00 FLAT
01-17 VIBRATO
/YESS/NO
18-45 OTHERS
WK-1800
HIGH-GRADE KEYBOARD
Ver.1 : Apr. 2007
CONTENTS
Specifications ---------------------------------------------------------------------------------------------- 2
Important Operation ------------------------------------------------------------------------------------- 4
Block Diagram --------------------------------------------------------------------------------------------- 5
Circuit Description --------------------------------------------------------------------------------------- 6
Diagnostic Program------------------------------------------------------------------------------------ 22
Major Wa veformes -------------------------------------------------------------------------------------- 28
Printed Circuit Board ---------------------------------------------------------------------------------- 29
Exploded View ------------------------------------------------------------------------------------------- 34
Parts List--------------------------------------------------------------------------------------------------- 35
Schematic Diagrams----------------------------------------------------------------------------------- 38
— 1 —
SPECIFICATIONS
GENERAL
Keyboard: 76 standard-size keys , 6 octav es (with touch response on/off; ExLight/
Light/Normal/Heavy touch)
Tones: 232 (128 General MIDI, 64 variation, 8 drum, 32 user); with layer and
split
Rhythm instrument tones: 53
Polyphony: 32 notes maximum (16 for certain tones)
Digital effects: 10 (REVERB 1, 2, 3; CHORUS; TREMOLO; PHASE SHIFTER; OR-
GAN SPEAKER; ENHANCER; FLANGER; EQ LOUDNESS)
Auto accompaniment
Rhythm patterns: 130 (120 + 10 user rhythms)
Tempo: Variable (226 steps, = 30 to 255)
Chords: 3 fingering methods (CASIO CHORD, FINGERED, FULL RANGE
CHORD)
Rhythm controller: Start/Stop, Intro, Normal/Normal Fill-In, Variation/Variation Fill-In,
Synchro/Ending
Accomp volume: 0 to 127 (128 steps)
One touch presets: Recalls settings for tone, tempo, layer , and Auto Harmonize in accor-
dance with rhythm.
Auto harmonize: Automatic addition of notes that harmonize with melody note in ac-
cordance with specified Auto Accompaniment chords.
Free session
Number of patterns: 120 (Auto Accompaniment function based on preset chord progres-
sions.)
Song sequencer
Songs: 2
Recording tracks: 6 (2 through 6 are melody tracks)
Recording method: Real-time
Memory capacity
(total for two songs): Approximately 8,000 notes
Punch in: Supported
Pattern sequencer
Number of patterns: 10 (Rhythm numbers 120 to 129)
Memory capacity: Approximately 6,800 notes
Elements: Intro, Normal, Variation, Normal Fill-In, Variation Fill-In, Ending
Parts: Chord 1, 2, 3; Bass; Rhythm
Recording method: Real-time
Registration memory
Number of setups: 20 (5 setups × 4 banks)
Memory contents: Tone, Rhythm, Tempo, Split on/off, Split point, Layer on/off, Auto Har-
monize on/off, Mixer settings, Keyboard channel on/off, DSP (digital
effect) on/off, DSP (digital effect) settings, Accompaniment mode,
Touch Response settings, Assignable jack setting, Transpose, Tun-
ing, Pitch Bend range, Sound range shift on/off
Demo tunes: 2
Synthesizer
Parameters: PCM set, amp envelope set, attack rate, release rate, pitch envelope
set, pitch, level, touch sensitivity, pan, filter sensitivity, filter le v el, trans-
pose
Mixer
Channels: 32(Internal 16, External 16)
Modes: Internal, External, External/Solo, External/Play
Parameters: Program change number, volume, expression, pan, coarse tuning,
fine tuning, Effect Send
MIDI: 16-channel multi-timbre receive, General MIDI Level 1
— 2 —
Other functions
Pitch bend range: Adjustable (12 semitones upwards and downwards)
Modulation: Equipped
Transpose: 25 steps (–12 semitones to +12 semitones)
Tuning: Adjustable (A4 = approximately 440Hz ± 50 cents)
Terminals
MIDI terminal: IN, OUT
Sustain/Assignable jack: Standard jack (sustain, sostenuto, soft, rhythm start/stop)
Line out L(MONO)/R
Output Impedance: 3 kΩ
Output Voltage: 1.5 V (RMS) MAX
Headphones Stereo standard jack
Output Impedance: 200 Ω
Output Voltage: 220 mV (RMS) MAX
12 V DC
Floppy disk drive
Type: 3.5" FDD
Formats: 2DD (720KB MS-DOS format)
2HD (1.44MB MS-DOS format)
Functions: Save and load of user tones, user rhythms, sequencer, and registration
data; playback of SMF; disk formatting; file delete; accompaniment pat-
tern style conversion
Power supply: Dual power supply system
Batteries Six D-size batteries
Battery life Approximately 2 hours continuous operation on alkaline batteries
AC adapter: AD-12
Auto power off: Turns power off approximately six minutes after last key operation. En-
abled under battery power only, can be disabled manually.
Speaker output: 5 W + 5 W
Power consumption: 12 V 18 W
Dimensions: 122.5 × 42.3 × 16.7 cm (48 1/4 × 16 11/16 × 6 9/16 inch)
Weight (without batteries): Approximately 9.8 kg (21.6 lbs)
Standard accessories: Music Stand; Pattern Conversion Disk
ELECTRICAL
Current drain with 12 V DC:
No sound output 480 mA ± 20 %
Maximum volume 1765 mA ± 20 %
with 24 keys from C3 to B4 pressed in Synth-Bass 4 tone
Volume: MAX., Velocity: MAX.
DSP0: Reverb1
Phone output level (Vrms with 32 Ω load each channel):
with tone Synth-Bass 4 tone L-ch (Key C3) 590 mV ± 20 %
Volume: MAX., Velocity: MAX. R-ch (Key F3) 590 mV ± 20 %
DSP0: Reverb1
Speaker output level (Vrms with 8 Ω load each channel):
with tone Synth-Bass 4 tone L-ch (Key C3) 7900 mV ± 20 %
Volume: MAX., Velocity: MAX. R-ch (Key F3) 7350 mV ± 20 %
DSP0: Reverb1
Output level (Vrms with 47 kΩ load each channel):
with tone Synth-Bass 4 tone L-ch (Key C3) 605 mV ± 20 %
Volume: MAX., Velocity: MAX. R-ch (Key F3) 510 mV ± 20 %
DSP0: Reverb1
Minimum operating voltage: 6.1 V
— 3 —
IMPORTANT OPERATION
Full Initialization
Use this procedure to return all keyboard settings to what they were when you purchased it. Note that this
procedure clears all data from memory.
• While holding down the ENTER button, turn on keyboard power.
Res
• Press YES to initialize the keyboard or NO to turn on power without changing any settings.
Parameter Initialization
Use this procedure to return all keyboard settings to what they were when you purchased it. Note that this
procedure does not affect user tones, user rhythms, registration memory contents, and display contrast
settings.
• While keyboard power is on, press the [+], [–], and ENTER buttons at the same time.
Adjusting Display Contrast
• Display contrast can be adjust to one of 100 levels for easy viewing.
• Adjusting display contrast helps to make figures easier to read from any viewing angle.
• Within five seconds after pressing the CONTRAST button, press [+] to increase the contrast value (making the display darker) or [–] to decrease it (making the display lighter).
• After you release CONTRAST, the message “Contrast” remains on the display for a few moments, during
which you can change the contrast setting further using [+] and [–] or by inputting a contrast value with the
number keys.
The contrast can be set to a value from 0 to 99. The initial default setting is 50.
et?
GM (General MIDI):
General MIDI standardizes MIDI data to play music with same nuance between different MIDI instruments.
Among GM conformed MIDI instruments, or commercially available musical data, music can be played with
similar tones.
SMF (Standard MIDI File):
SMF is a standard file format for MIDI instruments and computer music software. SMF formatted data can
be played and transported easily among SMF complied instruments or musical data of different manufacturers.
— 4 —
BLOCK DIAGRAM
ROM1
LHMN5KPP
LSI1 (32Mbit)
LHMN5KPN
LSI2 (32Mbit)
RA0 ~ RA21
RD0 ~ RD15
Working
RAM
TC55257
GFL-70L
LSI4
(256Kbit)
ROM2
EA0 ~ EA14
ED0 ~ ED8
ECEB, EOEB
EWEB
Keyboard
SI0 ~
SI9
FI0 ~
FI9
KC0
~
KC7
Key Controller
TC190C020AF-001
LSI6
RD, HWR,
LWR
D0 ~ D15
SORP, SYOB, WOK1, BOK
RESB
A0 ~ A3
DSP
D8 ~ D15 RESET
HG51B155FD
RD,
LSI3
HWR
BOK
D/A Converter
µPD63200GS
LSI5
RESB
A1 ~ A4
IN
MIDI
OUT
SED1278F2A
PBO
HD6433048SA89F
D0
~
D7
TC551001CF-70L
LSI7 (1Mbit)
CE1
LCD Driver
LSI601
LDB4
~LDB7
CONT,
LRS,
LR/L
LE
CPU
LSI9
RAM1
LWR, RD CE1 HWR, RD
SEG1 ~ SEG40
LCD
COM1 ~ COM16
LEDCK, LEDCL
S-Register
TC74HC164
IC401
LSDT
SWCK
S-Register
TC74HC164
IC402
KI0 ~ KI7
NMI
TEND, DREQ, CS2, CS3, 8/5
RD, HWR, LWR
A0 ~ A15
D0 ~ D15
D8
VBR VBR
~
D15
RAM2
TC551001CFL-70L
LSI8 (1Mbit)
Back Light
LEDA ~ LEDH
KC0 ~ KC7
Chip Selector
TC74HC08
RD, HWR,
IC4
LWR
Back Light Driver
TE-CFL733-IMI
Q601, Q602
LEDs
D8
~
D15
FDD Controller
HWR
RD
HD63266F
Buttons
VDD
Out put
LPF
(L)
LPF
(R)
Main
Volume
Power Amp.
LA4663
IC201
(L) (R)
Speakers
Reset IC
RN5VD40A
IC5
VDDVC
— 5 —
IC6
Power Supply Circuit
Q209,
Q213
IC202, Q207
Q208, Q211, Q214,
Q215
LSI10
RESET
AVDDAVCCDVDDFVDDCVDDVCC
VDD
VBR
Back up
Power
3.5" FDD Unit
DF354H064C
CR2032
APO
CIRCUIT DESCRIPTION
KEY MATRIX
KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7
FI0 E11 F11 F#11 G11 G#11 A11 A#11
SI0 E12 F12 F#12 G12 G#12 A12 A#12
FI1 B11 C21 C#21 D21 D#21 E21 F21 F#21
SI1 B12 C22 C#22 D22 D#22 E22 F22 F#22
FI2 G21 G#21 A21 A#21 B21 C31 C#31 D31
SI2 G22 G#22 A22 A#22 B22 C32 C#32 D32
FI3 D#31 E31 F31 F#31 G31 G#31 A31 A#31
SI3 D#32 E32 F32 F#32 G32 G#32 A32 A#32
FI4 B31 C41 C#41 D41 D#41 E41 F41 F#41
SI4 B32 C42 C#42 D42 D#42 E42 F42 F#42
FI5 G41 G#41 A41 A#41 B41 C51 C#51 D51
SI5 G42 G#42 A42 A#42 B42 C52 C#52 D52
FI6 D#51 E51 F51 F#51 G51 G#51 A51 A#51
SI6 D#52 E52 F52 F#52 G52 G#52 A52 A#52
FI7 B51 C61 C#61 D61 D#61 E61 F61 F#61
SI7 B52 C62 C#62 D62 D#62 E62 F62 F#62
FI8 G61 G#61 A61 A#61 B61 C71 C#71 D71
SI8 G62 G#62 A62 A#62 B62 C72 C#72 D72
FI9 D#71 E71 F71 F#71 G71
SI9 D#72 E72 F72 F#72 G72
Note: Each key has two contacts, the first conatct 1 and second contact 2.
Key
Second contact 2
First contact 1
NOMENCLATURE OF KEYS
C2 C3 C4 C5 C6 C7 G7E1
— 6 —
FI
KC
SI
BUTTON MATRIX
KI0
KC0
KC1
KC2
KC3
KC4
KC5
KC6
KC7
PWSW POWER
MODE
RECORD
SONG
PATTERN
DSP
CON-
TRAST
FREE
SESSION
ONE TOUCH
PRESET
V ARIATION/
KI1
INTRO
NORMAL/
FILL-IN
FILL-IN
SYNCHRO/
ENDING
START/
STOP
TEMPO
▼
TEMPO
▲
BANK
KI2
MIXER
SELECT
UPPER1
CH1
UPPER2
CH2
LOWER1
CH3
LOWER2
CH4
ACC V OL
CH5
CHORD1
CH6
CHORD2
CH7
KI3
CHORD3
CH8
BASS
CH9
RHYTHM
CH10
TR1
CH11
TR2
CH12
TR3
CH13
TR4
CH14
TR5
CH15
KI4
A
B
C
D
E
STORE
TRANSPOSE
▼
TRANSPOSE
▲
HARMONIZE
KI5
TR6
CH16
AUTO
ENTER
▲
▼
DISK
KI6
SPLIT
LAYER
RHYTHM
TONE
0
1
4
7
KI7
▼/NO
—
2
5
8
▲/YES
+
3
6
9
KI8
DEMO
SYNTH
TUNE/
MIDI
TOUCH
RESPONSE
LED MATRIX
LED-A
FULL RANGE
CHORD
LED-B
FINGERD
LED-C
CASIO CHORD
— 7 —
MEMORY DEVICES
Each memory device has the following data.
CPU
Internal Memory
3
ROM
512 kbit
4
RAM
16 kbit
LSI9
DSP
LSI3
Working RAM
7
256 kbit
LSI4
RAM1
1
1 Mbit
LSI7
RAM2
2
1 Mbit
LSI8
ROM1
5
32 Mbit
LSI1
ROM2
6
32 Mbit
LSI2
1 RAM1 :
S-RAM for operation program, Register, Pattern, Song
and SMF data from FDD. (Lower part of data bus)
2 RAM2 :
S-RAM for operation program, Register, Pattern, Song
and SMF data from FDD. (Upper part of data bus)
3 Internal ROM of CPU :
Main program data for system operation
4 Internal RAM of CPU :
Work area for system operation
5 ROM1 :
Demo, Accompaniment data, Song, P attern, Synth, Disk
mode
6 ROM2 :
Sound Waveforms/Tone data Digital sound effect
7 Working RAM :
Work area for DSP
RESET CIRCUIT
VDD
From power switch
Battery set
RESET
PWSW
VDD
RES
CPU
HD6433048SA89F
LSI9
NMI
PB0
PA7
RESET
APO
FDD Controller
HD63266F
LSI10
RESET
PW/SW ON
RESET
APO
DVDD
(5V)
Power Supply
Circuit
DVDD
HG51B155FD
Key Controller
TC190C020AF-001
DVDD
DVDD
DSP
LSI3
RESB
DVDD
RESB
LSI6
Initial reset
When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU.
When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU first raises
APO signal to +5 V to generate DVDD voltage, then raises RESET signal to +5 V. During this period the
DSP, the key controller and FDD controller LSIs initialize their internal circuits.
— 8 —
POWER SUPPLY CIRCUIT
The power supply circuit provides various voltages as shown below.
The voltage VDD (+5 V) is provided as long as batteries or AC adaptor is set.
Other voltages are controlled by APO (Auto Power Off) signal from CPU.
LC Filter
(To digital)
(To FDD)
(To LCD)
NMI
APO
PW/ON
APO
(To analog)
CPU
HD6433048SA89F
PA7
LSI9
NMI
PW/SW
The regulator IC BA9700A generates square waveform from pin 5 as PWM (Pulse Wide Modulation).
The LC filter makes stable output voltage (+5 V) for each circuit as shown above.
— 9 —
DSP and DAC CIRCUIT
RA22
Working RAM (256K-bit)
TC55257DFL-70L
LSI4
ROM2
LHMN5KPN
LSI2 (32Mbit)
ROM1
LHMN5KPP
LSI1 (32Mbit)
BOK
EA0 ~
EA14
D0 ~
D15
ED0 ~
ED15
KC0 ~
KC7
SI0 ~ SI9
FI0 ~ FI9
RA0 ~
RA21
RA0 ~ RA21
CS
RA23
CE,OE
A0 ~ A20,NC
Q0 ~ Q15
CE,OE
A0 ~ A20,NC
Q0 ~ Q15
WE
OE
D0 ~ D15
A0 ~ A14
PG
24.576 MHz
DAC
LOUT
ROUT
SORP: Sound data
BOK: Bit clock
WOK1: Word clock
CLK
SI LRCK
LRCK0
DOUT
SORP
WOK1
WOKI0 DI D0 LRCK0
DSP
HG51B155FD
LSI3
CPU
HD6433048SA89F
LSI9
Key Controller
TC190C020AF-001
LSI16
RD0 ~ RD15
RA0 ~
RA21
D8 ~
D15
Control
data
key
data
key
data
Keyboard
The DSP (Digital Signal Processor) and DAC (Digital Analog Converter) consists of the following circuits.
— 10 —
FDD UNIT (DF354H064C)
FDD Specifications:
1 Memory Capacity (under un-format) : 1.6 MByte
2 Density of track : 5.33 track/mm (135 TPI)
3 Number of track : 77 track/side
4 Number of head : 2
5 Rate of data transfer : 500 kbps
6 Access time (between two tracks) : 3 m seconds
7 Compensation of writing data : 125 n second (all tracks)
8 Rotation speed : 360 Min-1 (rpm) ± 1.5 %
FDD Interface:
Host system Drive
CN2 connector
Drive Select 1 12
Density Select4
Index8
Motor ON 16
Direction 18
Step 20
Write Data 22
Write Gate 24
Side 1 Select 32
DC.GND
+5 V
N.C 4
System Frame GND.
Track 0026
Write Protect28
Read Data30
Disk Change34
GND Pin Numbers of CN2:
1, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33
Non connected Pin Numbers of CN2:
2, 6, 10, 14 (Pin #3 is removed to prevent erroneous insertion)
CN1 connector
1
+5 V Return2
+5 V Return3
0 Ω
Signal GND
— 11 —
Drive Frame GND.
LCD BACKLIGHT
DG
CVDD
When voltage CVDD is supplied, transistors Q601 and Q602 start oscillation.
From the oscillation voltage, transformer T601 generates about 600 V which is necessary for lighting the
backlight.
— 12 —
CPU (LSI9: HD6433048SA89F)
The 16 bit CPU contains a 1M-bit ROM, a 16K-bit RAM, eleven 8-bit I/O por ts, an A/D converter, a D/A
converter and serial interfaces. The CPU accesses to the RAM1, RAM2, DSP, Key controller, FDD controller and LCD driver LSI. The CPU also controls buttons, LEDs, bender input and MIDI input/output.
Pin No. Terminal In/Out Function
1 VCC In VCC (5 V) source.
2 ~ 5 PB0 ~ PB3 Out Data bus for LCD driver.
6 PB4 Out Chip enable signal for LCD driver.
7 PB5 Out Read/write signal for LCD driver.
8 DREQ0 — DMA (Direct Memory Access) request.
9 PB7 Out Register selection signal for LCD driver.
10 RES0 In Not used.
11 VSS In Ground terminal (0 V).
12 TXD0 Out MIDI signal output.
13, 15 ~ 17 P91, P93~P95 In Key input signal from buttons.
14 RXD0 In MIDI signal input.
18 ~ 21
23 ~ 34
D0 ~ D15 In/Out Data bus.
22 VSS In Ground terminal (0 V).
35 VCC In Vcc (5 V) source.
36 ~ 43,
45 ~ 56
A0 ~ A19 Out Address bus.
44, 57 VSS In Ground terminal (0 V).
55, 59, 60 P52, P61, P62 In Key input signal from buttons.
58 WAIT — Not used.
61 CLKOUT Out Clock signal (16 MHz).
62 STBY — Not used.
63 RES In Reset signal at VDD (5 V) supplied.
64 NMI In Power ON signal input.
65 VSS In Ground terminal (0 V).
66, 67 EXTAL, XTAL In Clock (16 MHz) input.
68 VCC In Vcc (5 V) source.
69 AS — Not used.
70 RD Out Read signal.
71 HWR Out Write signal for upper data bus.
72 LWR Out Wr ite signal for lower data bus.
73 ~ 75 MD0 ~ MD2 In Mode selection terminals.
76, 77 AVCC, VREF In Power source and reference voltage for internal A/D, D/A.
78 P70 In Key input signal from buttons.
79 AN1 In Pitch bender voltage detection.
— 13 —
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