Hammond XK-1, Руководство по обслуживанию

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used for UM and LM tone wheel generator and the rest are used
for pedal, percussion and key-click. It switches off the tone wheel
channel when the extra voice is selected.
It also reads the data of U32 wave ROM and outputs the key
sound which was ordered by the Main CPU, to DSP.
2-6 DSP
The U2, TMS320C6711CGDP is the high efficient DSP, which has a
internal clock (200MHz). The memory for the delay system is the
U35, 1M SRAM. This DSP has a chorus vibrato, overdrive, tone
control, expression control, Leslie simulation, reverbs and delay
system.
2-7 D/A converter
The U28 is the high efficient D/A converter, which has a 24 bit
balanced output system. The U7, OPAMP, which is behind the D/A
converter, converts the balanced signal to the unbalanced one and,
at the same time, work as the LOWPASS FILTER which gets out
the SAMPLING CLOCK.
2-8 Serial Interface
PK MIDI IN, LM MIDI IN and MIDI OUT are connected to the U1,
Main CPU (SH7144) directly.
2-9 LCD control
The U1, Main CPU controls the LCD display (2 lines x 20 letters).
3.
Panel Switch board SWH-510A, 511A, 512A
Each of them is connected to the MGH-94A and controlled by the
U1, Main CPU (SH7144).
SWH-510 has the VR1 (master volume), VR2 (tone volume) and
VR3 (overdrive volume). And it is connected to the MGH-94A. The
tone volume has a center click.
SWH-511 has the RSW1 (rotary encorder) and is connected to the
MGH-94A.