Harman kardon AVR254 – How rest the AVR – Amplifier circuit diagram

Erase a macro
1. Simultaneously press and hold the Activity Button and the Numeric Key or AVR Power On Button assigned to the activity until the Source Selector or AVR Settings Button lights.
2. Press the Activity Button to erase the macro.
Resetting the Remote
To reset the remote to its factory defaults, simultaneously press and hold the TV
Source Selector and the “0” Alphanumeric Key. When the TV Button re-lights,enter the code “333”. When the TV Button goes out, and all of the Source Selectors flash, the remote will have been fully reset.
Processor Reset
There may be instances when you wish to fully reset the AVR 254 to its factorydefaults, or the unit may behave erratically after a power surge. To correct erraticbehavior, first try turning the Master Power Switch off and unplugging the ACpower cord for at least three minutes. Plug the cord back in and turn the receiverback on. If this doesn’t help, try a system reset.
NOTES:
# A system reset erases all user configurations, including video resolution, speaker and level settings, and tuner presets. After a reset, you will need to reenter all of these settings.
# The RS-232 Reset Button on the rear panel of the AVR 254 does not perform a system reset. DO NOT press the RS-232 Reset Button.
To reset the AVR 254, place the receiver in Standby mode (press the front panel Standby/On Switch so that the Power Indicator turns amber).
Then press and hold the front-panel OK Button for at least five seconds until theRESET message appears in the display.
Memory
If the AVR 254 is unplugged or experiences a power outage, it will retain usersettings for one month.

AMPLIFIER CIRCUIT DIAGRAM 

CLICK ON THE IMAGE TO ZOOM IN 

Denon AV Receiver – Denon AVR-1908 - AVR-788 – How to initialize the AVR – How to adjusted the Idle current

Initializing Procedure 
AV SURROUND RECEIVER/AMPLIFIER initialization should be performed when the Micom, peripheral parts of Micom, and Digital P.W.B. are replaced.
1. Switch off the unit.
2. Hold the following SPEAKERS-A button and SPEAKERSB button, and switch on the unit.
3. Check that the entire display is flashing with an interval of about 1 second, and release your fingers from the 2 buttons and the microprocessor will be initialized.

TEST MODE
Micom/DSP Error Display Mode
Micom version display mode:
When the following conditions are satisfied at its starting state, error information is displayed before version information.
Starting method:
E3,EUT,E1C model
While pressing 2 buttons, "STATUS" and "DIMMER", turn on on/off button.
Then, press "STATUS" button to display the information on the FL Display.
E2,E2A model
While pressing 2 buttons, "RT" and "PTY", turn on on/off button.
Then, press "RT" button to display the information on the FL Display.

ADJUSTMENT
Audio Section
Idling Current
Required measurement equipment: DC Voltmeter
1. Preparation
(1) Avoid direct blow from an air conditioner or an electric fan, and adjust the unit at normal room temperature 15 Degree C > 30 Degree C (59 F > 86 F).
(2) Presetting
# POWER (Power source switch) OFF
# SPEAKER (Speaker terminal) No load
(Do not connect speaker, dummy resistor, etc.)

2. Adjustment
(1) Remove top cover and set VR101 FL, FR, C, SL, SR, on Main Amp. Unit, VR401, VR402 on 2ch- Amp. Unit at fully counterclockwise  position.
(2) Connect DC Voltmeter to test points (FRONT-Lch: TP101, FRONT-Rch: TP105, CENTER ch: TP103, SURROUND-Lch: TP102, SURROUND-Rch: TP104, SURROUND-BACK Lch: TP401, SURROUND-BACK Rch: TP402)

(3) Connect power cord to AC Line, and turn power switch "ON".
(4) Presetting.
MASTER VOLUME : "---" counterclockwise ( min.)
SPEAKER (Speaker terminal) : No load
(Do not connect speaker, dummy resistor, etc.)
MODE : 7CH STEREO

Function mode : CD

(5) Within 2 minutes after the power on, turn VR101 clock wise to adjust the TEST POINT voltage to 1.5 mV ± 0.5 mV DC

(6) After 10 minutes from the preset above, turn VR101 to set the voltage to 2.0 mV ± 0.5 mV DC.

(7) Adjust the Variable Resistors of other channels in the same way.

Sony 7.1 channel HD AV Receiver - Sony STR-DA5300ES – How to clear the memory – Special menu mode – How to adjust the IDLE current

FLUORESCENT INDICATOR TUBE PATTERN CHECK MODEWhen this test is activated, all segments turn on at the same time, then each segment turns on one after another.
Procedure:
1. While pressing the [MOVIE] and [DMPORT] buttons, press the [POWER] button to turn on the main power.
2. All segments and all LEDs turn on.

SOUND FIELD CLEAR MODE
The preset sound field is cleared when this mode is activated. 
Procedure:
1. While pressing the [MUSIC] button, press the [POWER] buttonto turn on the main power.
2. The message “S. F. Initialize” appears and initialization is performed.

MEMORY CLEARING MODE
All preset contents are cleared when this mode is activated. 
Procedure:
1. While pressing the [TONE MODE] and [DMPORT] buttons, press the [POWER] button to turn on the main power.
2. The message “MEMORY CLEARING***” appears and the memories are reset to the default values.
3. When done, the message “MEMORY CLEARED*” appears.

TUNER AM STEP CHANGE (9 kHz/10 kHz) MODE
Either the 9 kHz step or 10 kHz step can be selected for the AM channel step.
Procedure:
1. Press the [POWER] button to turn on the main power.
2. Turn the [INPUT SELECTOR] dial to select the “AM”.
3. Press the [POWER] button to turn off the main power.
4. While pressing the [TUNING MODE] button, press the [POWER]button to turn on the main power.
5. Either the message “AM 9kHz Step” or “AM 10kHz Step” appears, select the desired step.
COMMAND MODE CHANGE MODE
The command mode of the remote-commander which this set receives can be changed.
Procedure:
1. While pressing the [2CH/A. DIRECT] button, press the [POWER]button to turn on the main power.
2. Either the message “COMMAND MODE [AV1]” or “COMMAND MODE [AV2]” appears. Select the desired mode.
SF LOCK ON/OFF CHANGE MODE
Procedure:
1. While pressing the [MUSIC] and [DMPORT] buttons, press the [POWER] button to turn on the main power.
2. Either the message “SF LOCK [OFF]” or “SF LOCK [ON]” appears.

SPECIAL MENU MODE
Procedure:
1. Press the [POWER] button to turn on the main power, then while pressing the [TONE MODE] button, press the [A.F.D.], [2CH/A. DIRECT], [MUSIC], [MOVIE] button in order, the message “MENU SPECIALIZED!” appears.
2. Press the  UP/DOWN button of the remote commander, the message “<<< SPECIAL >>>” appears.
3. Press the RIGHT button of the remote commander, the item is appears.
4. Each time the UP/DOWN button of the remote commander is pressed, the item is switched to another.
Some items can change the content. Display the cursor by pressing the RIGHT button of the remote commander, and changing the content by pressing the UP/DOWN button of the remote commander, and fix the content by pressing the LEFT button of the remote commander when you want to change the content of the item.
5. To release from this mode, while pressing the [TONE MODE] button, press the [A.F.D.], [2CH/A. DIRECT], [MUSIC], [MOVIE] button in order again, the message “MENU SPECIALIZED OFF” appears.

BIAS ALIGNMENT ADJUSTMENT
Note: Power up the amplifier and leave for 10 minutes to warm up. Then adjust the Idle current each channels .
Connection:

CN1561 (CN1611, CN1761, CN1861) pin 1, CN1561 (CN1761, CN1861) pin 3  TO THE POSITVE PROB OF VOLTMETER
CN1561 (CN1611, CN1761, CN1861) pin 2, CN1561 (CN1761, CN1861) pin 4 TO THE NEGATIVE  PROB OF VOLTMETER

Note: Pin 3, 4 of CN1611 are open.
Procedure:
1. Connect a digital voltmeter to the CN1561 (CN1611, CN1761, CN1861).
2. Press the [POWER] button to turn on the main power.
3. Adjust the RV1501 (RV1551, RV1601, RV1701, RV1751, RV1801, RV1851) so that the digital voltmeter reading is 5 mV to 20 mV.

Adjustment Location:

Yamaha AV Receiver - RX-V573 - HTR-5065 – How to access diagnostic mode – Protection mode and causes – Firmware update procedure

Self-Diagnostic Function

While pressing the “TONE CONTROL” and “INFO” keys, press the (Power) key to turn on the power and keep pressing those 2 keys and  (Power) key for 3 seconds or longer. The self-diagnostic function mode is activated.

Canceling Self-Diagnostic Function
1. Before canceling self-diagnostic function, execute setting for “S3. FACTORY PRESET” menu. (Memory initialization inhibited or Memory initialized).
In order to keep the user memory preserved, be sure to select PRESET INHIBIT (Memory initialization inhibited)

2. Press the (Power) key to turn off the power

PROTECTION MODES AND CAUSES

When there is a history of protection function 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.

When the protection function worked due to abnormal DC output

Cause: DC output of 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 5 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 seconds and the power supply will be shut off.

When the protection function worked due to excessive heatsink temperature.

Cause: The temperature of 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 seconds and the power supply will be shut off.

UPDATING FIRMWARE

Confirmation of firmware version and check
Before and after updating the firmware, check the firmware version and checksum by using the selfdiagnostic function menu.

Start up the self-diagnostic function and select “S4.
ROM VERSION/CHECKSUM” 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 again.

Initializing the back-up IC

After updating the firmware, the back-up IC MUST be initialized by the following procedure to store the setting information (soundfield parameters, system memory and tuner presetting, etc.) properly

Start up the self-diagnostic function and select “S3. FACTORY PRESET” menu.

Select “PRESET RSRV”, press the (Power) key to turn off the power once and turn on the power again. Then the back-up IC is initialized.

Firmware Updating  procedure
1. Insert the USB storage device to the USB jack.
2. While pressing the “INFO” key, connect the power cable to the AC outlet.

3. The USB UPDATE mode is activated and “USB Update” is displayed. Writing of the firmware starts automatically.

4. When writing of the firmware is completed, “UPDATE SUCCESS”, “PLEASE...” and “POWER OFF!” are displayed repeatedly.

5. Press the (Power) key to turn off the power.
6. Remove the USB storage device from the USB jack.
7. Start up the self-diagnostic function and check that the firmware version and checksum are the same as written ones.

Pioneer Elite 3D Ready 7.1 channel AV Receiver – Pioneer SC37 - SC35 - SC1525K - How to access Service mode – How to check the amplifier section – How to backup and Save setting

SERVICE MODE

How to enter/exit

During Standby mode, simultaneously press and hold “MULTI-ZONE ON/OFF” and “ENTER” keys for 5 seconds to enter this mode.
Turn off the power to this unit by setting the main volume level to “---dB” and Multi-zone to “OFF”.
UPDATE PANEL Mode (Version update)
1. Copy the UPDATE FILE to the root directory of the USB Memory.
Note: NEVER copy several UPDATE FILES to the root directory of the USB Memory.
Copy only the corresponding UPDATE FILE.
2. Turn off the power to this unit by setting Multi-Zone to "OFF".
3. Connect the USB Memory to the USB terminal of the front panel.
4. While holding down "TUNE UP" key on the front panel, press "STANDBY ON/OFF" key and moves to the UPDATE PANEL mode.
Display will show booting id completed. 
5. Using TUNE UP/DOWN Key select "Update"
6. Pressing Enter Key enter to Update menu.
7. Using PRESET +/ - key Select "Yes".
8. Press Enter Key to continue the Update.
Update time is fluctuated by contents of the update. It will take about 15 minutes at the maximum. (Actual time is from 2 minutes to 12 minutes.)
Amplifier Diagnosis without Current Applied

The most common symptom of the power amplifier failure is the destruction of the power amplifier output stage or the power amplifier power circuit due to the heavy load, which is, for example, caused by short of the speaker terminal or the use of the non-guaranteed low impedance speaker.
If the protection circuit immediately shuts it down immediately after the current is applied, it is highly likely that it is the above symptom.
The procedure to diagnose/repair without applying current is shown below.

Before starting the diagnosis, wait for three minutes until the electricity is discharged.
1.Check that the MOSFET is not shorted (Ex.) Q4100, Q4101
2.Check that the gate resistance is not damaged (Ex.) R4148, R4149
3.Check that the gate diode is not damaged (Ex.) D4101, D4102
4.Check that the gate drive transistor is not damaged (Ex.) Q4102, Q4103, Q4104, Q4105
5.Diagnosis of the output stage power supply.
6.Check that the fuses FU61 and FU62 are not burned out
7.Check that the transistors Q7300 and Q7301 are not damaged
8.Check that the diodes D7308 and D7310 are not damaged
9.Diagnosis of the driver power supply.
10.Check that the fuse FU15 is not burned out
11.Diagnosis of the power amplifier drive circuit (The example below uses the wiring No. of FLch) (When the driver power supply has an error, it is suspected that the power amplifier drive circuit also has an error)
12.Check that the driver IC is not damaged (IC4101)
13.Check that the L and R connected in series to the power supply are not damaged (L4104, R4147).

HOW TO SAVE AND LOAD THE SETTINGS USING BACKUP FUNCTION WITH USB MEMORY
This model is capable of saving the set values stored in the MAIN Ucom of DIGITAL MAIN Board in the USB and loading them in a new DIGITAL MAIN Board.
(Note that MAIN Ucom should normally operate to enable this function.)
When replacing DIGITAL MAIN Board execute the above mentioned processes.
Data that can be saved/cannot be saved
The following data can not be saved. Data other than these can be saved.

Contents to save	Destination to save
Last memory for turning ON/OFF the Main power and power supply for ZONE2 and ZONE3 Last memory for inputting the Main power, ZONE2 and ZONE3 Setting for controlling HDMI Remote control ID Setting for RF remote control (EXPANSION Setup) Setting for Network Standby Data to be save upon the operation of protection circuit	EVENT Ucom
Settings for HMG (Only for SC-37, SC-LX83 system: Because BridgeCo is used.) Preset Memory, Favorite, Recently played, etc.	BridgeCo IC

(As the data saved by EVENT Ucom is on the DISPLAY Board, the data cannot be deleted unless Board is replaced at the same time.)
Requirements for USB memory
USB memory to be used should meet the following requirements.
# Compatible with USB Mass storage Class
# With a file system of FAT(FAT32)
File saving format
Files are to be saved in the following format: Model number_backup version.extension(avr)
Example: SC-37_BK01.avr
How to save in the USB memory from AV amplifier
1. Insert the usable USB memory into the USB terminal when the main device is off.
2. Enter the SERVICE MODE and select [USB BAK HOLD ] with UP AND DOWN ARROW keys.
3. Select [USB BAK SAVE? ] with LEFT AND RIGHT ARROW keys and press [ENTER].
4. Saving in the USB starts and the main device automatically goes off after the normal completion ([COMPLETE] is displayed.).
5. Remove the USB and saving is finished.
A. If the following errors occur after "SAVE" is executed, error message will be displayed and "SAVE" will be stopped and the power will be turned off.
# Ejecting of USB device
# Short capacity of USB device
# Error during writing in the USB device (Read Only or defective Sector, etc.)
B. If the same file name exists in the USB, overwriting will be automatically executed.

How to write into AV amplifier from the USB memory
1. Insert the USB with the saved file into the USB terminal when the main device is off.
2. Enter the TEST MODE and select [USB BAK HOLD ] with UP AND DOWN keys.
3. Select [USB BAK LOAD? ] with LEFT AND RIGHT  keys and press [ENTER].
4. Saving in the main device starts and it automatically goes off after the normal completion ([COMPLETE] is displayed.).
5. Remove the USB and loading is finished.
If the following errors occur after "LOAD" is executed, error message will be displayed and "LOAD" will be stopped and the power will be turned off.
# No setting file
# Mismatching between the setting file and the specification of the A/V RECEIVER type to be loaded back
# Error due to Checksum, Signature Check, and Size Check
# Ejecting of USB device (during reading of the setting file)

SONY STR-DN1010 – Updating the firmware - How to access test mode – How to initialize the AVR

TEST MODE

TUNER AM STEP CHANGE MODE
Either the 9 kHz step or 10 kHz step can be selected for the AM channel step.
Procedure:
1. Press the [POWER] button to turn on the main power.
2. Press the [INPUT SELECTOR - ]/[INPUT SELECTOR +] buttons to select the “AM TUNER”.
3. Press the [POWER] button to turn off the main power.
4. While pressing the [DISPLAY] button, press the [POWER] button to turn on the main power.
5. Either the message “AM 9k Step” or “AM10k Step” appears, select the desired step.
6. After a few second, “AM 531 kHz” or “AM 530 kHz” appears, select the desire step.
SOUND FIELD CLEAR MODE
The preset sound field is cleared when this mode is activated.
Procedure:
1. While pressing the [MUSIC] button, press the [POWER] button to turn on the main power.
2. The message “S.F. CLEAR” appears and initialization is performed.
INITIALIZE MODE
All preset contents are cleared when this mode is activated.
(a) SHIPMENT MODE
Procedure:
1. While pressing the [DISPLAY] and [A.F.D.] buttons, press the [POWER] button to turn on the main power.
2. The message “CLEARING” appears and the memories are reset to the default values.
3. When done, the message “CLEARED !” appears, the set will power off.
(b) ALL CLEAR INITIALIZE
Procedure:
1. While pressing the [SPEAKERS] and [MUTING] buttons, press the [POWER] button to turn on the main power.
2. The message “CLEARING” appears and the memories are reset to the default values.
3. When done, the message “BD” appears after “CLEARED !”.
(c) USER INITIALIZE
Procedure:
1. Hold the [POWER] for 5 seconds.
2. The message “CLEARING” appears on the display.
3. After a few seconds, “CLEARED !” appears.

FLUORESCENT INDICATOR TUBE DISPLAY TEST
All fluorescent segments are tested. When this test is activated, all segments turn on at the same time, then each segment turns on one after another.
Procedure:
While pressing the [MUTING] and [DISPLAY] buttons, press the [POWER] button to turn on the main power.
1. ALL segments light on.

2. Press the [DISPLAY] control, confirm display.

3. Again Press the [DISPLAY] control, confirm display.

4. Press the [DISPLAY] control, all segments light off.
SWAP MODE
The signal will be swap to all channel so that all speaker will have sound output.
Procedure:
1. While pressing the [SPEAKERS] and [2CH/A.DIRECT] buttons, press the [POWER] button to turn on the main power.
2. The message “SWAP MODE” appears (No change while displayed).
COMMAND MODE CHANGE MODE
The command mode of the remote-commander which this set receives can be changed.
Procedure:
1. While pressing the [MUTING] and [DIMMER] buttons, press the [POWER] button to turn on the main power.
2. Either the message “C. MODE AV1” or “C. MODE AV2” appears. Select the desired mode.
PROTECTOR OFF MODE
This mode switching on/off the protector to investigate the cause of the protector.
Procedure:
1. While pressing the [INPUT MODE] and [A.F.D.] buttons, press the [POWER] button to turn on the main power.
2. “PROT OFF” appears and switch off the set..

HISTORY MODE
The state that the set is used is memorized.
Procedure:
1. While pressing the [INPUT MODE] and [2CH/A.DIRECT] buttons, press the [POWER] button to turn on the power and “HISTORY” is displayed.
2. Each time the [UP]/[DOWN] buttons on the remote commander is pressed, the item is switched.

SOFTWARE VERSION DISPLAY MODE

The software version is displayed.
Procedure:
1. While pressing the [INPUT MODE] and [MUSIC] buttons, press the [POWER] button to turn on the main power.
2. The message “N1 ** M-.--” appears.
**: Destination
Each time the [DISPLAY] button is pressed, “F.Ver -.--”, “H.Ver -.--” and “S.Ver -.--NII” this order, and returns to the “N1 ** M-.--” displayed.

SPDIF UPDATE MODE (FIRMWARE UPDATE)Plays the CD that contains u-com/DSP data with CD/DVD player.
Update u-com/DSP etc. firmware from SPDIF input.

Procedure:
Normal case
1. While pressing [DIMMER] button, press the [POWER] button to turn on the main power.
2. The messages “UPDATE” and “PLAY DISC” are displayed alternately every one second.
3. Connect CD player to TV OPTICAL IN jack (IC2004 on the DIGITAL board), and play update CD.
Update is started when DSP detect update signal. The message “UPDATING” is displayed blinks every one second.
4. While main u-com is being updated, fluorescent indicator tube is blacked out.
5. When update data error is detected or disc is not matched with target model, error messages “DISC ERROR” and “PLAY DISC” are displayed to restart playing valid CD.
When flash writing error is happened, error messages “UPDATE ERR” and “PLAY DISC” are displayed to restart playing CD.
6. When all update is finished, set is reboot automatically. After reboot, complete message “COMPLETE” is displayed (displayed continuously until any user operation).
Procedure:
After update is abnormal exit, and set is power on again
1. Enter update mode automatically after power on.
2. The messages “UPDATE” and “PLAY DISC” are displayed alternately every one second.
From this step, all user operation is prohibited. Power off is also prohibited.
If main u-com was failed to update, nothing is displayed.
3. Connect CD player to TV OPTICAL IN jack (IC2004 on the DIGITAL board), and play update CD.
Update is started when DSP detect update signal. From this, same as normal case.

SPDIF UPDATE CHECK
Function that checks hardware error for SPDIF update. This test takes about 15 seconds.
Procedure:
1. While pressing [DIMMER] and [2CH/A.DIRECT] buttons, press the [POWER] button to turn on the main power.
2. The message “TESTING” is displayed and LED (MULTI CHANNEL DECODING indicator) is blinking.
3. When abnormality is not found, the message disappears and LED is light up.
4. Communication error between main microcomputer and DSP, the messages “UART” and “ERROR” are displayed and LED is blinking in fast speed.
Communication error between HDMI microcomputer and DSP, the messages “HDMI” and “ERROR” are displayed and LED is blinking in fast speed.
Communication error between Faraudja and DSP, the messages “VIDEO” and “ERROR” are displayed and LED is blinking in fast speed.
Unknown error, the messages “UNKNOWN” and “ERROR” are displayed and LED is blinking in fast speed.
5. To release from this mode, AC power cord pull out.