Tuesday, January 19, 2016

YAMAHA RX-V765 - HTR-6270 AV Receiver Self diagnostic mode – Protection function and firmware update - AV receiver Repair and service - Manual service - fix yourself

                                                          Category: AV Receiver Repair and service 

Contents of this article 
  • Accessing Self diagnostics
  • Protection function 
  • Firmware update  



YAMAHA RX-V765 - HTR-6270

Starting Self-Diagnostic Function
While pressing TONE CONTROL AND PURE DIRECT , press the “MAIN ZONE ON/OFF” key to turn on the power.
The self-diagnostic function mode is activated.
Starting Self-Diagnostic Function in the protection cancel mode
If the protection function works and causes hindrance to trouble shoot, cancel the protection function as described below, and it will be possible to enter the self-diagnostic function mode.
(The protection functions other than the excess current detect function will be disabled.)
While pressing those TONE CONTROL AND PURE DIRECT, press the “MAIN ZONE ON/OFF” key to turn on the power and keep pressing those 2 keys and “MAIN ZONE ON/ OFF” key for 3 seconds or longer.
The self-diagnostic function mode is activated with the protection functions disabled.
In this mode, the SLEEP segment of the FL display of this unit flashes to indicate that the mode is self-diagnostic function mode with the protection functions disabled.
Canceling Self-Diagnostic Function
1. Before canceling self-diagnostic function, execute setting for FACTORY PRESET of main menu No. 24 (Memory initialization inhibited or Memory initialized).
# In order to keep the user memory stored, be sure to select PRESET INHIBITED (Memory initialization inhibited).
2. Press the “MAIN ZONE ON/OFF” key of this unit to turn off the power.
Display provided when Self-Diagnostic Function started
The display is as described below depending on the situation when the last time the power to this unit is turned off.
When the power is turned off by usual operation:
The FL display of this unit displays “NO PROTECT” then the main menu (sub-menu “1. ANALOG BYPAS” of main menu No. 1 BYPASS) a few seconds later.
When the protection function worked to turn off the power:
The FL display of this unit displays the data of protection function which worked at that time then the main menu (sub-menu “1. ANALOG BYPAS” of main menu No. 1 BYPASS) a few seconds later.
Note: At that time if you reactivate the self-diagnostic function after turning off the power once by pressing the “MAIN ZONE ON/OFF” key, “NO PROTECT” will be displayed because that situation is equal to “1. When the power is turned off by usual operation:” described above. However the protection function history is stored in memory with a backup. For details, refer to main menu No. 21 PROTECTION HISTORY.
When the protection function worked due to excess current
Cause: An excessive current flowed through the power amplifier.
Supplementary information: As current of the power amplifier is detected, the abnormal channel can be identified by checking the current detect transistor. Turning on the power without correcting the abnormality will cause the protection function to work immediately and the power supply will instantly be shut off.
Note)
# Applying the power to this unit without correcting the abnormality can be dangerous and cause additional circuit damage. To avoid this, if protection function has been activated 3 times continuously, the power will not turn on even when the “MAIN ZONE ON/OFF” key is pressed. In order to turn on the power again, disconnect the power cable of this unit from the AC outlet once and then reconnect it again.
# The output transistors in each amplifier channel should be checked for damage before applying power of this unit.
# Amplifier current should be monitored by measuring DC voltage across the emitter resistors for each channel.
When the protection function worked due to a short between speaker terminals.
Cause: The line between speaker terminals is shorted.
Supplementary information: As the excess current is detected after operation of the speaker relay, the shorted speaker terminal and the connected speaker can be identified.
Turning on the power without correcting the abnormality will cause the protection function to work immediately and the power supply will instantly be shut off.
When the protection function worked due to abnormal DC output.
Cause: DC output from the power amplifier is abnormal.
Supplementary information: The protection function worked due to a DC voltage appearing at the speaker terminal. A cause could be a defect in the amplifier. Turning on the power without correcting the abnormality will cause the protection function to work in 3 seconds and the power supply will be shut off.
When the protection function worked due to abnormal voltage in the power supply section.
Cause: The voltage in the power supply section is abnormal.
Supplementary information: The protection function worked due to a defect or overload in the power supply. Turning on the power without correcting the abnormality will cause the protection function to work in 1 second and the power supply will be shut off.
When the protection function worked due to excessive heatsink temperature.
Cause: The temperature on the heatsink is excessive.
Supplementary information: The protection function worked due to the temperature limit being exceeded. Causes could be poor ventilation or a defect related to the thermal sensor.
Turning on the power without correcting the abnormality will cause the protection function to work in 1 second and the power supply will be shut off.
# For detection of each protection function, refer to main menu described later.
History of protection function
When the protection function has worked, its history is stored in memory with a backup. Even if no abnormality is noted while servicing the unit, an abnormality which has occurred previously can be defined as long as the backup data has been stored.
For details of the history of protection function, refer to main menu No. 21 PROTECTION HISTORY. The history of the protection function is cleared when self-diagnostic function is cancelled by selecting PRESET RESERVED (Memory initialized) of main menu No. 24 or when the backup data is erased.
Initial settings used to start Self-Diagnostic Function
The following initial settings are used when starting selfdiagnostic function. When self-diagnostic function is canceled, these settings are restored to those before starting self-diagnostic function.
# Master volume: -20 dB
# Zone2 Volume: +2.5 dB
# Input: AV5 (MAIN ZONE) / AUDIO1 (ZONE2)
# Main menu: 1. ANALOG BYPASS
# Speaker setting: LARGE, Bass out to SWFR (All channels)
# Speaker impedance: 8 ohms position
# OSD: ON
# XM Power: ON (U model)
UPDATING FIRMWARE
Confirmation of firmware version and checksum
Before and after writing firmware, check the firmware version and checksum by using the self-diagnostic function menu. Start up the self-diagnostic function
Using the sub-menu, have the firmware version and checksum displayed, and note down them.
Writing method using the CD
Required Tools
# DVD or CD player (with DIGITAL OUTPUT (OPTICAL
or COAXIAL) jack)
# Optical cable (when OPTICAL jack is used)
# Digital audio pin cable (when COAXIAL jack is
used)
# Firmware CD
# To make the firmware CD, download the latest
firmware from the specified download source.
# Connection
Connect this unit and DVD/CD VIA OPTICAL CABEL
Operation Procedures
1. While pressing the “STRAIGHT” key of this unit, connect the power cable of this unit to the AC outlet.
The FIRMWARE UPDATE mode is activated
2. Connect the power cable of DVD/CD player to the AC outlet.
3. Press the “STANDBY/ON” key of the DVD/CD player to turn on the power.
4. Press the “EJECT” key of the DVD/CD player to open the disc tray.
5. Put the firmware CD on the disc tray and close the disc tray.
6. Press the “PLAY” key of the DVD/CD player. Then writing of the firmware is started.
7. When writing of the firmware is completed, “Update Success”, “Please...” and “Power off!!” are displayed repeatedly.
If the display remains unchanged for longer than 10 seconds after starting the firmware CD play procedure, perform the firmware CD play procedure again from the beginning. If “FILE CORRUPTED” is displayed after “XXXXXX”, make sure that the written data is not corrupted and perform Steps 1 to 7 of “Writing method using the CD” again. If “Upgrade Failed” is displayed, perform Steps 1 to 7 of “Operation Procedures” again.
8. Press the “STOP” key of the DVD/CD player.
9. Press the “EJECT” key of the DVD/CD player to open the disc tray.
10. Remove the firmware CD from the disc tray and close the disc tray.
11. Press the “STANDBY/ON” key of the DVD/CD player to turn off the power.
12. Press the “MAIN ZONE ON/OFF” key of this unit to turn off the power.
13. Start up the self-diagnostic function and select “25. ROM VER/SUM/PORT” menu.
Using the sub-menu, have the firmware version and checksum displayed, and then check that they are the same as written ones.
* When the displayed firmware version and checksum are different from written ones, perform the “Writing method using the CD” all over again.
14. Press the “MAIN ZONE ON/OFF” key of this unit to turn off the power.