Casio WK-1800 Service Manual

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DSP and DAC CIRCUIT
The DSP (Digital Signal Processor) and DAC (Digital Analog Converter) consists of the following circuits.
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
Key-
board

Casio WK-1800 Specifications

General

Number of Keys	76
MIDI	Yes
Display	LCD
Effects	Reverb, Chorus
Weight	8.5 kg
Polyphony	32
Speakers	Yes
Power Supply	AC adapter or batteries
Floppy Disk Drive	Yes
Connections	Headphones, MIDI In/Out, Sustain pedal
Sequencer	6 tracks