Monday, August 01, 2022

Samsung Mini-Compact System MX-F730 - protection circuits, micom update, region setting, schematic diagrams and more

 

Power
2.0 ch : 550 W Total RMS - 6000 W PMPO
IR Amp

Compatible - DVD - Divx (Only MX-F730D), MP3, CD or CD-R, RW, WMA

Total Output Power: 550 Watts (MAX)

Troubleshooting table for No Power and No Output


Measures to be taken when the Protection Circuit operates

Operation of Power Block Protection Circuit

Cases of the SMPS Protection.
1) If there is over current at the AMP IC. (Speaker Wire Short)
2) If temperature of the AMP IC is over 150
.
3) There is no power supply for amp.

Check AMP in Power Protection

If you think, there are problems at the AMP Part, you can check the PCB without disassembling the set.

Operation of Power Block Protection Circuit

Cases of the SMPS Protection.
1) If there is over current at the AMP IC. (Speaker Wire Short)
2) If temperature of the AMP IC is over 150
.
3) There is no power supply for amp.


Check AMP in Power Protection

If you think, there are problems at the AMP Part, you can check the PCB without disassembling the set.

MICOM, MPEG Initialization & Update

MICOM Reset
• During STANDBY mode, push the ‘STOP” Button 5 Seconds. If VFD blinking, reset is finished.
Micom Update (Only for Flash Micom)
• Method 1) MAIN PCB UTCN1 for update JIG. To update MICOM, it need Computer, Rom Writer, USB Cables.
• Method 2) Insert USB Memory, and play. “Update” will be displayed. Set will be power off when finish.
• Method 3) Insert Update DISC, and play. “Update” will be displayed. Set will be power off when finish.
Micom & MPEG Version Check
1) Power On.
2) CD open status.
3) Push the number NEXT for 5 seconds, check the MICOM version.
4) Push the number PREVIOUS for 5 seconds, check the MPEG version.

 MPEG Update
1) Insert USB Memory or Update DISC which have Update file, and play. “Update” will be displayed.
2) When finish the Set will be power off → on automatically.
3) And then the Deck is automatically open.
MPEG Reset
1) During “No Disc” Displayed, push the stop Button 5 seconds. After displayed “INITIALIZE” set will power off automatically.

Buyer-Region Code Setting Method

The inserting method of Region Code after replacing the Main PBA

NOTE
When replacing the Main PBA and System Micom should be inserted the region code.
The set is not working properly if you don't insert the region code.
The region code is inserted by the remote control.

During “AUX” status.
MX-F730 or F730CB : Push the “ENTER” button 10 Second.
MX-F730D : Push the “D” button (blue key) 10 Second

2) When displayed ‘TEST”, import 46 to set the buyer.

3) When displayed ‘– – –’, import the buyer code.  The buyer setting code can find in the table named “MX-F7** Option - Table”.

4) It will show the buyer that you set up. Then the buyer setting is succeeded.

Region code table


Wiring diagram


Pin connection

Pin connection

SMPS boards 1 and 2


Main 1,2,3,4,5 and front








Wednesday, July 27, 2022

Sony HCD-GTKI1- service mode, adjustments, disassembly, schematic diagram and more


US model

Canadian model

Australian model


HCD-GTK1i

E Model

HCD-GTK1i / GTK2i

HCD-GTK1i is the tuner, USB and iPod section in FST-GTK1i and RDH-GTK1i.

HCD-GTK2i is the tuner, USB and iPod section in FST-GTK2i.

Front speaker:
Power Output (rated)
35 W + 35 W (at 6
W, 1 kHz, 1% THD) RMS output power (reference)
110 W + 110 W (per channel at 6
W, 1 kHz)
Subwoofer: RMS output power (reference)
230 W (8
W, 100 Hz)

HOME AUDIO DOCKING SYSTEM - Sony-STK433-090-E Power IC

Rest modes

UI TEST MODE
This mode is used to check LCD display, keys, VOLUME jog, model, destination, and software version.

1. Press [FUNCTION] button and [<< << Tuning--] button simultaneously and stay for 5 seconds.
2. All segments in the LCD are lighted up.
3. When press [|<< >> Tuning --] button, the display changes to model name. When press [|<< << Tuning --] button again, the display will change to model destination.  When continue press [|<< << Tuning] button again,
the display will show software version of the software creation. The sequence is model name, model destination, SC, SY, PF, UI, M1, M2, I1, I2, TA, and ST, in this order, and returns to the model name display.
4. When you want to know the release date of the software version, press [PRESET EQ] button during display software version. Press [PRESET EQ] button again, the same software version will display on the LCD.
5. When [>> >>|] button is pressed, half of alternate segments in the LCD are lighted up.  If you press [>> >>|] button again, another half of alternate segments in the LCD are lighted up. Press [>> >>| Tuning+] button again, all segments will lights off and press [>> >>| Tuning+] button again, all segments will lights up.
6. Press [>||] button, the key check mode is activated. In the key check mode, the LCD displays “K 0 V0”. Each time a button is pressed, “K” value increases. Press other keys on main unit to check whether the key is detected.
However, once a button has been pressed, it is no longer taken into account. When all the keys on the main unit have been pressed, the LCD display will show “OK” and “K 8” alternately. 

For US and Canadian model, the LCD display will show “OK” and K 7” alternately.  “V” value increases in the manner of 0, 1, 2, 3 ... if [VOLUME] knob is turned clockwise, or it decreases in the manner of 0, 9, 8, 7 ... if [VOLUME] knob is turned counter clockwise.

To release from UI Test mode

1. To release from this mode, Press [FUNCTION] button and [>> >>|] button simultaneously and stay for 5 seconds or disconnect the power cord.

MC TEST MODE
This mode is used to check operations of the respective sections of Amplifier

To enter MC Test Mode
1. Press [>> >>| Tuning +] button and [PRESET EQ] button simultaneously and stay for 5 seconds.
2. The upper segments of LCD will blink. The function is changed to AUDIO IN.

Check of Amplifier
1. Press [PRESET EQ] button repeatedly until a message “GEQ MAX” appears on the LCD. GEQ increases to its maximum.
2. Press [PRESET EQ] button repeatedly until a message “GEQ MIN” appears on the LCD. GEQ decreases to its minimum.
3. Press [PRESET EQ] button repeatedly until a message “GEQ FLAT” appears on the LCD. GEQ is set to flat.

 4. When the [VOLUME] knob is turned clockwise even slightly, the sound volume increases to its maximum and a message “VOL MAX” appears on the LCD.
5. When the [VOLUME] knob is turned counter clockwise even slightly, the sound volume decreases to its minimum and a message “VOL MIN” appears on LCD.

To release from MC Test mode
1. To release from this mode, press [u] button and [GROOVE] button simultaneously and stay for 5 seconds.
2. The cold reset is enforced at the same time.
COLD RESET
The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the customer.
Procedure:
1. Press [u] button and [GROOVE] button simultaneously and stay for 5 seconds.
2. The LCD becomes blank for a while, and the set is reset when power off.
3. The LCD will show “RESET”, and the set is reset when power on.

VACS ON/OFF
This mode is used to switch ON and OFF the VACS (Variable Attenuation Control System)

Procedure:
1. During power on, press [FUNCTION] button and [GROOVE] button simultaneously and stay for 5 seconds.
The message “VACS ON” or “VACS OFF” appears on the LCD for 2 seconds.
TUNER STEP CHANGE
The step interval of AM channels can be toggled between 9kHz and 10kHz.

During power on, press [TUNER/BAND] button on the remote control or [FUNCTION] button until show “TUNER AM” on the LCD.
2. Press [>||] button and [PRESET EQ] button simultaneously and stay for 5 seconds. The message “9K STEP” or “10K STEP” appears on the LCD and thus the channel step is changed.

VACS DISPLAY
This mode is used to check the VACS level.
Procedure:
1. During Power on, Press [>||] button and [|<< << Tuning --] button simultaneously and stay for 5 seconds.
2. The VACS Level Display as “VA APB”. “V” represents VACS, A represent VACS level which is triggered by signal level, “AP” represents APVACS (Abuse Protection VACS) and “B” represents APVACS level which is
triggered.

To release from VACS DISPLAY
1. To release from this mode, press [>||] button and [|<< << Tuning --] button simultaneously and stay for 5 seconds or disconnect the power cord.

Factory preset [HCD-GTK1i/GTK2i]

FACTORY PRESET
This mode is use to load all the factory use preset frequency into FM 1-FM 20 and AM 1-AM 10.

Press [>>  >>| Factory +] button and [m TUNING –] button simultaneously and stay for 5 seconds.
2. If the current function is not TUNER AM or TUNER FM, it will automatically switch to TUNER FM function. The message “FACTORY” appears on the LCD for 2 seconds and tuning mode will change to preset mode. Frequency of FM 1-FM 20 and AM 1-AM10 are set to the minimum frequency.

SIRCS DISABLE TEST MODE
 This mode is used to switch ON and OFF the SIRCS (Standard Code for Infrared Remote Control System).

During power on, press [>> >>| Tuning +] button and [GROOVE] button simultaneously and stay for 5 seconds. The message “SIRCS ON” or “SIRCS OFF” appears on the LCD for 2 seconds.

To release from SIRCS DISABLE TEST MODE
1. To release from this mode, press [>> >>| Tuning +] button and [GROOVE] button simultaneously and stay for 5 seconds.

FM AUTO STOP CHECK

1.Turn the power on.
2. Input the following signal from Signal Generator to FM antenna input directly.
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz

Deviation
Modulation
ANT input

: 75 kHz
: 1 kHz
: 35 dBu (EMF)

Note: Please use 75 ohm “coaxial cable” to connect SG and the set. You cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and scan the input FM signal with automatic scanning.
4. Confirm that input Frequency of A, B and C detected and automatic scanning stops.
The stop of automatic scanning means “The station signal is received in good condition”.

Disassembly procedure.

Top panel: Block and Back assembly; Power SWB  board, Trans board and DC fan.


Main board and Volume board.


 

Circuit board location.

Volume level and LCD level board.

iPod board.


Main board and Volume board.


Front panel and loud speaker.

Volume level and LCD level board.



Saturday, July 02, 2022

Toshiba 47L64xxD series LCD Colour Television – Service mode – Hotel mode – software update – main board exchange – entering serial number – and more

 

  Always respect voltages. While some may not be dangerous in themselves, they can cause unexpected reactions that are best avoided. Before reaching into a powered TV set, it is best to test the high voltage insulation. It is easy to do, and is a good service precaution.

  The melting temperature of lead-free solder is higher than that of leaded solder by 30ºC to 40ºC (54ºF to 72ºF). Use of a soldering iron designed for lead-based solders to repair product made with lead-free solder may result in damage to the component and or PCB being soldered. Great care should be made to ensure high-quality soldering when servicing this product especially when soldering large components, through-hole pins, and on PCBs as the level of heat required to melt lead-free solder is high.

  Depending on the model, use an isolation transformer or wear suitable gloves when servicing with the power on, and disconnect the power plug to avoid electrical shock when replacing parts. In some cases, alternating current is also impressed in the chassis, so electrical shock is possible if the chassis is contacted with the power on.

How to enter and Exit from the SERVICE MODE

* Press MUTE button once on Remote Control.
TV mode changes as follows. Un-Mute => Mute

* Press MUTE button again and keep pressing. (Sound Mute is cancelled)

* While pressing the MUTE button, press P Up button on TV control panel. 

This is the way to enter the service mode. Letter 'S' will appear at top right corner of the screen indicating that the set is in Service Mode.  See the service mode screen below.

KEY FUNCTION IN THE SERVICE MODE and Test Signal Selection.  

The following key entry during display of adjustment menu provides special functions.

SELECTING THE ADJUSTING ITEMS

While displaying the adjustment menu, press the P UP button to cycle through the adjustment items in the order of table. (P DN button for reverse order)

ADJUSTING THE DATA

While displaying the adjustment menu, press the VOLUME + OR – button to change the value of data in the range from 00H to FFH. The variable range depends on the adjusting item.

HOW TO EXIT FROM SERVICE MODE

Press the [Exit] button on Remote.

ADJUSTING ITEMS IN THE SERVICE MODE

LED INDICATIONS FOR SERVICE - Software Upgrade and Error conditions indicated by the Power LED is described below.

How to ENTER the HOTEL MODE MENU

1) Open Main Menu by pressing Menu button of RCU.
2) Press the following password number “1048” with the button of Remote Control.
Note: Hotel Menu can be displayed to input the password number when there is focus in the first layer of Main Menu.

DISPLAY OF HOTEL MODE MENU

The Graphic Design and color of Hotel Mode Menu is the same as the User menu.
(Small differences which do not affect to operation will be acceptable)
- The language will follow the “Menu Language” setting in the menu.

OPERATING HOTEL MODE MENU

To enable Hotel Mode, press ▲or DN buttons to select “Hotel Mode” item and press u button.
Press ▲or DN buttons to select “ON” and press OK button.
- Once Hotel Mode is “On”, the Hotel Mode settings will be enabled for adjusting.
- Press ▲or▼ buttons to select item of Hotel Mode Settings.
Press
u and ▲or▼ buttons to select settings and press OK button.
See the table below for explanation of each setting.

Press Exit when finished adjusting the settings.

USB CLONE FUNCTION

Feature overview
Hotel Menu settings and Welcome Screen image, Picture settings, Default URL of Toshiba Cloud TV.
Services and Network settings should be copied to other TV by Hotel Menu “USB Clone Function”.
Welcome Screen image
File name: WelcomeScreen.jpg (case sensitive)
File type: JPEG
Color depth: 24bpp
Resolution: 1280 x 720
File size: 1MB or less
Note: The Welcome image is preserved besides the TOSHIBA logo (default). When user would like to copy Welcome Screen, the clone data should be exported to USB memory in advance and then put the Welcome Screen image into USB and start import Clone data from USB to TV.
< Default URL of Toshiba Cloud TV Services >
File name: hotelCloudConfig.txt (case sensitive)
*However, URL can be operated on the site specially developed.
File type: Text
Note: When user would like to copy “URL of Toshiba Cloud TV Services”, the clone data should be exported to USB memory in advance and then put “hotelCloudConfig.txt” file into USB and start import Clone data from USB to TV.

Copying data form TV to USB

Press “OK” on “Start USB Clone” button of “USB Clone Function”, USB Clone mode initial window [1-1] is displayed.
The options below are selected by left and right keys in this window.
USB to TV 
Copy setting data in USB memory to TV.
TV to USB
 Copy TV settings to USB memory.
(2) Insert USB memory, select “TV to USB” [1-2] and press [OK] key.
(3) The now copying window [1-3] will be displayed.
(4) Wait for window that indicates the copying process is complete before removing the USB drive.

To write data form USB to TV
(1) Press “OK” on “Start USB Clone” button of “USB Clone Function”, USB Clone mode initial window [2-1] is displayed.
(2) Insert USB memory, select USB to TV [2-1], and press [OK] key.
(3) The window [2-3] will be displayed.
(4) When the copying has finished successfully, the message "The TV will reboot when this window is closed." will be displayed. If the copying is not successful, an error message will be displayed.
(5) Exit the menu and the TV will reboot.
(6) Remove the USB memory.

MAIN BOARD EXCHANGE
When Main board is exchanged, the Application SW (Firmware) and Model Setting need to be updated and the serial number needs to be written the serial number into Main Board (see “WRITING SERIAL NUMBER INTO MAIN BOARD”).
Please update in the following procedures.

Updating of Software and Model Setting

Copy the Application SW (Firmware) file and the Model Setting file to the root of the USB mass storage device.
Note : Use the USB mass storage device formatted with “FAT32”

Unplug TV, and then insert the USB mass storage device to the USB slot of the TV.
Note : Please unplug TV after turning ON TV by "Power" key on remote control.
3. During pressing “-” key of side key on TV, plug TV.
Note : Please continue pressing "-" key until "Software upgrade in progress." appears on a screen.

After updating complete, unplug TV and remove the USB mass storage device.

Plug TV, then check the updating by using self check screen.
Refer to “Confirmation of Software updating” section on next page.
6. Update to the newest SW.
This model can be updated from aerial or network to the newest Software.
Refer to the user manual of this model for the updating method.

Confirmation of Software updating

Check the TV Model and Model Info by using self check screen.
1. Press SETUP on Remote Control.
2. Select “Get Help” >> “System Information”
3. Press “
3” “5” “7” “4
Self check screen is displayed.


WRITING SERIAL NUMBER INTO MAIN BOARD
When the board is broken, service man will go to customers home and change the board. After change the board service man has to put the serial number same as before. So the service man will use the PC and write the serial number to USB mass storage device. After that the service man will plug the USB mass storage device to the TV and write the serial number to the TV.

Create the ini file by Text Editor.
File Name: Service Serial Number Writing.ini
File Format: Plain Text.
Write two lines, "[serial number]" and a serial number, using the text editor on Windows.
For example, when a serial number is "C37222T00008L1":
[serial number]:  C37222T00008L1
2. Use the USB mass storage device formatted with “FAT32”.
3. Copy the "ServiceSerialNumberWriting.ini" file to the root directory of the USB mass storage device.

Enter Service mode.
1. Press the MUTE button once on Remote Control.  TV mode changes as follows. Un-Mute => Mute
2. Press the MUTE button again and keep pressing.
3. While pressing the MUTE button, press P UP
 button on TV control panel.
5. Insert the USB mass storage device to the USB slot of the TV set.  Writing starts.

After finish writing the “OK” and “Serial number” appear on TV.

Unplug USB mass storage device.
8. Check the serial number by using self check screen.
How to enter the self check screen.
1 Press SETUP on remote control unit.
2 Select “Get Help” >> “System Information”
3 Press “
3” “5” “7” “4

Sunday, June 26, 2022

Samsung HT- E6759W 7.1 Blu-ray Home Theatre System – SMPS and Power Amplifier schematic (Circuit Diagram), firmware update, How to initialize, Region code setting, region code table and more

 

How to check F/W version

Method1
- Step1: Open the tray.
- Step2: Press and Hold “INFO” button on the remote for 5 seconds.
- Then, you will see below screen.



Method2 (For only Back End version)
- Select the Settings on the menu.
- Settings → Support → Contact Samsung

Description for the meaning
- Front: System micom
- S/W: BACKEND Firmware
- Loader: Loader Firmware
- Region: BD region code-DVD region code
- Macrovision: Macrovision version
- Model: Model name
- Main Touch IC: touch key firmware
- HDMI RX: HDMI Firmware

The four methods are explained below:

By Internet
To upgrade by Internet, follow these steps:
1) Select By Internet, and then press the ENTER button. The Connecting to Server message appears.
2) If there is a download available, the Download pop-up appears with a progress bar and the download starts.
3) When the download is complete, the Upgrade Query window appears with three choices: Upgrade Now, Upgrade Later, or Don’t Upgrade.

4) If you select Upgrade Now, the product upgrades the software, turns off, and then turns on automatically.
5) If you do not make a selection in one minute or select Upgrade Later, the product stores the new upgrade software. You can upgrade the software later using the By Downloaded function.
6) If you select Don’t Upgrade, the product cancels the upgrade.

NOTE: Your product must be connected to the Internet to use the By Internet function.
The upgrade is complete when the product turns off, and then turns on again by itself.
Never turn the product off or back on manually during the update process.
Samsung Electronics shall take no legal responsibility for product malfunction caused by an unstable Internet connection or
consumer negligence during a software upgrade.
If you want to cancel the upgrade while the upgrade software is downloading, press the ENTER button.

By USB
To upgrade by USB, follow these steps:
1) Visit www.samsung.com-bluray support.
2) Download the latest USB software upgrade zip archive to your computer.
3) Unzip the zip archive to your computer. You should have a single folder with the same name as the zip file.
4) Copy the folder to a USB flash drive.
5) Make sure the disc tray is empty, and then insert the USB flash drive into the USB port of the product.
6) In the product’s menu ,go to Settings > Support > Software Upgrade.
7) Select By USB.

The disc tray must be empty when you upgrade the software using the USB Hostjack.
When the software upgrade is done, check the software details in the software Upgrade menu.
Do not turn off the product during the software upgrade. It may cause the product to malfunction.
Software upgrades using the USB Hostjack must be performed with a USB memory flashstick only.

By Disc
To upgrade by Disc, follow these steps:
1) Visit
www.samsung.com-bluray support.
2) Download the latest disc software upgrade zip archive to your computer.
3) Unzip the zip archive to your computer. You should have a single folder with the same  name as the zip file.
4) Write the folder on to a disc. Use a CD-R or DVD-R.
5) Finalize the disc before you remove it from your computer.
6) Insert the disc in to product.
7) In the product’s menu, go to Settings > Support > Softwareupgrade.
8) Select By Disc.

By Downloaded
The By Downloaded option lets you upgrade using a file the product downloaded earlier but you decided not to install immediately or a file downloaded by the product in Standby Mode. 
To upgrade By Downloaded, follow these steps:
1) If upgrade software has been downloaded, you will see the software version number to the right of By Downloaded.
2) Select By Downloaded, and then press the ENTER button.
3) The product displays a message asking if you want to upgrade. 
Select Yes. The product begins the upgrade.

4) When the update is complete, the product turns off automatically, and then turns on.

Download in Standby Mode.
You can set the Download in Standby Mode function so that the product downloads new upgrade software when it is in Standby mode. In Standby mode, the product is off, but it's Internet connection is active.This allows the product to download upgrade software automatically, when you are not using it.
To set Download in Standby Mode, follow these steps:
1) Press the ▲▼ buttons to select Download in Standby Mode, and then press th eENTER button.
2) Select On or Off.
Off: If you select Off, the product will notify you with a popup message when new upgrade software is available.
On: If you select On, the product will automatically download new upgrade software when it is in Standby
mode with the power off. If it downloads new upgrade software, the  product will ask you if you want to install it when you turn the product on.

How to initialize the set (How to Unlock the Parental Password)

Case1 (Main program initialization)
• This is useful for forgotten Parental Lock password to make unlock.
• Press stop butt on the front panel for over 5 seconds in ‘No Disc’ status.
• Then, VFD sign: ‘INIT’ → Power will be turned off automatically.
• Initial setting screen will turn out when you start.
• It makes security lock be unlocked.

Case2 (System Micom initialization)
• During Stand-By, just press Remote Controller Stop-Button for over 5 seconds.
Then, VFD Sign:‘ Reset.’→ Power will be turned off automatically.
• System Micom setting will be initialized.
• Tuner setting EQ setting will be initialized.

How to set the region code

After replacing the Main PCB and System Micom (IC23), the region code should be inserted.
The unit will not work properly if you do not insert the correct region code.
You must use the remote control.

1) Selec the "AUX" mode and then press the" Tuner Memory" button on the remote control for 4-5seconds

2) You should see the “T-MODE” message display on the VFD. Press the “▼” direction button during this message.

NOTE:  The “T-MODE” indicator on the VFD only appears for a very short time.

3) You can see “TEST--” on the VFD. Insert the number “46” to select the Region Code.


4) After step (3), you can see “---” on the VFD.
Insert the Region Code (see the Table below) corresponding to the mode land area in which you reside in using the “0-9” buttons on the remote control.
When you insert the number, the first number is“0”. For example, HT-D51005.1CHUSA–>000.
After that, power off. To check the number you inserted ,do 1,2,3 and then insert “47”during “TEST--”.

Region code Table



Pin connections


Main Power (SMPS) schematic


Power Amplifier schematic