REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Saturday 14 December 2019

YAMAHA RX-V767/HTR-7063, RX-A800 - AV RECEIVER HOW TO UPDATE THE FIRMWARE, HOW TO SETUP THE IDLE CURRENT OF MAIN AMPLIFIER

How to update the firmware, How to setup the idle current of main amplifier - AV Receiver Yamaha RX-V767/HTR-7063, RX-A800

Updating firmware [Software]
When the following parts are replaced, the firmware must be updated to the latest version.
DIGITAL P.C.B.
IC951 (TI (DSP) flash ROM) of DIGITAL P.C.B
Confirmation of firmware version and checksum
Before and after updating the firmware, check the firmware version and checksum by using the self diagnostic function menu.
Start up the self-diagnostic function and select “S4.
ROM VER/SUM” menu.
Using the sub-menu, have the firmware version and checksum displayed, and note them down.
* When the firmware version is different from written one after updating, perform the updating procedure again from the beginning.
Initializing the back-up IC
(EEPROM: IC903 of the DIGITAL P.C.B.)
After updating the firmware, the back-up IC MUST be initialised by the following procedure to have proper memorisation of the set up information (sound field parameters, system memory and tuner presetting, etc.).
Start up the self-diagnostic function and select “S3.
FACTORY PRESET” menu. (See “SELF-DIAGNOSTIC FUNCTION”)
Select “PRESET RSRV”, press the “MAIN ZONE ” (power) key of this unit to turn off the power once and turn on the power again. Then the back-up IC is initialized.
Required Tools
• BD, 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
* Download the latest firmware from the specified download source and create the firmware CD.
Connection
Connect this unit and BD/DVD/CD player as shown below.
Operation Procedures
1. While pressing the “TUNING >>” key of this unit, connect the power cable of this unit to the AC outlet.
The FIRMWARE UPDATE mode is activated and “CDDA Upgrader” is displayed.
2. Play the firmware CD on the BD/DVD/CD player. Writing of the firmware starts automatically.
3. When writing of the firmware is completed, “Update Success”, “Please...” and “Power off!!” are displayed repeatedly.
* If the display remains unchanged for more 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 “Address:XXXXXX”, make sure that the written data is not corrupted and perform Steps 1 to 3 of “Operation Procedures” again.
If “Upgrade Failed” is displayed, perform "operation procedures" again from the beginning.
4. Press the “MAIN ZONE ” (power) key of this unit to turn off the power.
5. Eject the firmware CD from the BD/DVD/CD player.
6. Start up the self-diagnostic function and check that the firmware version and checksum are the same as written ones. (See “Confirmation of firmware version and checksum”)
Self-diagnostic function
This unit has self-diagnostic functions that are intended for inspection, measurement and location of faulty point. There are 24 main menu items, each of which has sub-menu items.
Starting Self-Diagnostic Function.
While pressing the “TONE CONTROL” and “INFO” keys of this unit, press the “MAIN ZONE ”(power) key of this unit 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 the “TONE CONTROL” and “INFO” keys press the “MAIN ZONE ” (power) key to turn on the power and keep pressing those 2 keys 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.
CAUTION
Using this product with the protection function disabled may cause further damage to this unit. Use special care for this point when using this mode.
Cancelling Self-Diagnostic Function
Before cancelling self-diagnostic function, execute setting for FACTORY PRESET of main menu No. S3. (Memory initialisation inhibited or Memory initialised). * In order to keep the user memory preserved, be sure to select PRESET INHIBIT (Memory initialisation inhibited). Press the “MAIN ZONE ” (power) 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 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 “A1-1. DSP MARGIN” of main menu No. A1 DSP AUDIO) 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 “A1-1. DSP MARGIN” of main menu No. A1 DSP AUDIO) 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 ” (power) 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 a back-up IC with a backup. For details, refer to main menu P2 PROTECTION HISTORY.”
When there is a history of protection function due to excess current.
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.
Notes)
• Applying the power to this unit without correcting the abnormality can be dangerous and cause additional circuit damage. To avoid this, if “I PROTECT” protection function works 1 time, the power will not turn on even when the “MAIN ZONE ” (power) key is pressed. In order to turn on the power again, start up the self-diagnostic function.
• The output transistors in each amplifier channel should be checked for damage before applying power to 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 abnormal DC output.
Supplementary information: The protection function worked due to a DC voltage appearing at the speaker terminal. 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.
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.
Notes)
• Applying the power to this unit without correcting the abnormality can be dangerous and cause additional circuit damage. To avoid this, if “PS” and “DC” protection function works 3 times consecutively, the power will not turn on even when the “MAIN ZONE ” (power) key is pressed.
In order to turn on the power again, start up the self-diagnostic function.
• The output transistors in each amplifier channel should be checked for damage before applying power to this unit.
• Amplifier current should be monitored by measuring DC voltage across the emitter resistors for each channel.
The temperature of the heat sink 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.
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. Initial settings used to start Self Diagnostic Function The following initial settings are used when starting self diagnostic function. When self-diagnostic function is cancelled, these settings are restored to those before starting self-diagnostic function. • Master volume: -20 dB / Zone volume: +2.5dB • Input: HDMI1 / Zone: AUDIO1 • Main menu: A1-1. DSP MARGIN • Speaker setting: LARGE, Bass out to SWFR (All channels) • HDMI Control: Off • Zone: On
Details of Self-Diagnostic Function menu
DSP AUDIO This menu is used to check audio signal route via DSP. A1-1. DSP MARGIN The audio signal is output including the head margin via DSP. * When input source is stereo, signal is assigned as below. Front L: Front L, Center, Surround L, Surround Back L Front R: Front R, Surround R, Surround Back R Front L +10 dB: Sub-woofer.
DSP NON MARGIN The SUB-WOOFER signal is output including the head margin via DSP. The audio signal other than SUB-WOOFER is output without including the head margin via DSP.
When the protection function worked due to excessive heat sink temperature.
Confirmation of idling current of amp unit
Right after power is turned on, confirm that the voltage across the terminals of R1152 (SURROUND BACK RCH), R1154 (SURROUND RCH), R1150 (FRONT RCH), R1148 (CENTER), R1149 (FRONT LCH), R1153 (SURROUND LCH), R1151 (SURROUND BACK LCH) are between 0.1mV and 10.0mV.
  If it exceeds 10.0 mV, open (cut off) R1090 (SURROUND BACK RCH), R1092 (SURROUND RCH), R1088 (FRONT RCH), R1086 (CENTER), R1087 (FRONT LCH), R1091 (SURROUND Lch), R1089 (SURROUND BACK LCH) and reconfirm the voltage.
Attention
  If the measured voltage exceeds 10.0mV after an amplifier repair, first check for a defective component before cutting the bias resistor.
  Confirm that the voltage is 0.2 mV to 15.0 mV after 60 minutes.
Posted By: FRANK at 09:00
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