- 4 -
- 23 -
3.2 Spectrum Sampling Amplification Circuit: The routes carrying the five-channel
signals sent from the IC N402 are connected to the sampling resistors R494, R495,
R496, R565 and R566 respetively.(The SW channel sends out the signals directly.) After
being mixed by these resistors, the signals reach N406A to be amplified. The incurred
spectrum analyzing signal source is sent to the front panel circuit.
4. Control Circuit.
The control circuit of this player is divided into CPU Circuit, Front Panel Control and
Display Circuit and Spectrum Analyzing Circuit.
4.1 CPU Circuit
N422 (AT89C540) is this unit's CPU which sends all commands to the command-
controlled circuits to perform all control functions. It incorp5V power supply and
its pin 40 is the power supply pin. The 12M crystal oscillator provides the work clock for
itself. The pin 9 is the restoration pin. When this unit is getting started, +5V passes
VD409 to reach the positive pole of C531. Because of the C531's charging, its negative
end sends out an instantaneous high level which passes through R686 to reach the pin
9 of N422. The pin 9 of N422 restores the low level mode with the end of charging. This
restoration circuit's style is the high level restoration to keep in low level. You can also
refer to the circuit diagram for other command instructions.
The static information such as the power-on logo and on screen displays when this unit
is working is stored in the CPU's static memory. N421 is a power-off-mode memory which
can record the working information when this unit is turned off and call back these
information when this unit is turned on next time. Therefore, you need not to readjust the
unit every time you turn it on. Furthermore, the sound field modes that you set are also
stored in N421, which can be called back when needed.
4.2 Front panel control and display circuit
This circuit incorporates an exclusive IC N901 (UPD16311). Its pins 10, 11, 12 and 13
are connected to the press scan matrix which receives the control commands from the
user and process them into two-line outputs: One line reaches to the VFD to display the
working modes, another line passes pins 5, 6, 8 and 9 to CPU to finish the control
functions.
N902 is the remote control sensor. It convert the infrared signals received to electric
signal and then send it to the pin 13 of CPU to finish the remote control function.
RP901 and RP905 comprise a digital pulse potentiometer. When rotating it, a series of
digital pulse will be sent out and added to the pins 23, 24, 25 and 26 to be detect and
processed to finish the control functions. RP901 finishes the master volume adjustment
and RP905 finishes multi-function adjustment.
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