Yamaha HTR-5440RDS Service Manual download pdf (Page 25)

RX-V420/RX-V420RDS/HTR-5440/HTR-5440RDS

RX-V420/RX-V420RDS/

HTR-5440/HTR-5440RDS

Display Description

WAIT Bus being checked.

NOER No error detected.

DATA Data bus shorted or open.

ADDR Address bus shorted or open.

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.

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.

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.

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

0.1mV ~ 5mV

(DC)

R27 (MAIN Lch)

R33 (MAIN Rch)

R47 (CENTER)

R39 (REAR Lch)

R43 (REAR Rch)

R53 (MAIN Lch)

R55 (MAIN Rch)

R67 (CENTER)

R59 (REAR Lch)

R65 (REAR Rch)

Cut off

■ 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.

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Yamaha HTR-5440RDS Service Manual Page 25

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