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13. DSP RAM CHECK
This menu is used to self-diagnose whether or not bus connection of YSS928 (IC801) and the external RAM (IC802) is made
properly.
During signal processing, the status before execution of this menu is maintained.
14. MICROPROCESSOR INFORMATION
There are 3 sub-menu items.
The version, checksum and the port specified by the microprocessor are displayed. The signal is processed using EFFECT
OFF. The checksum is obtained by adding the data at every 16 bits for each program area and expressing the result as a 4-
figure hexadecimal data.
I AMP ADJUSTMENT
Confirmation and Adjustment of Idling Current of
Main (1) P. C. B.
• Right after the power is turned on, confirm that the
voltages at R53, R55, R59, R65 and R67 are between
0.1mV and 5mV.
• If any exceed 5mV, cut R27, R33, R39, R43 or R47.
• Reconfirm that they are between 0.1mV and 5mV.
• The voltages should be 0.1mV ~ 5mV after the power
has been on for 60 minutes.
Bus Check [Remote control code: 7A-0A (CD SKIP+)]
The address bus and the data bus are checked and the connection condition is
displayed.
When no error is detected, "NOER" appears on display.
Display
Description
WAIT
Bus being checked.
NOER
No error detected.
DATA
Data bus shorted or open.
ADDR
Address bus shorted or open.
Version [Remote control code: 7A-0D (CD REW)]
Release 1 figure / Main 2 figures / DSP 2 figures / Communication 1 figure / Boot
manufacturer 1 figure / Boot 232c 1 figure
Checksum [Remote control code: –]
1 : All
2 : Program area
Port indication [Remote control code: –]
Model name, Destination, Headphone detection, FM stereo
RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS
0.1mV ~ 5mV
(DC)
R53 (MAIN Lch)
R55 (MAIN Rch)
R67 (CENTER)
R59 (REAR Lch)
R65 (REAR Rch)
Cut off
R27 (MAIN Lch)
R33 (MAIN Rch)
R47 (CENTER)
R39 (REAR Lch)
R43 (REAR Rch)
24
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