Master Electronics Repair !

Welcome to Master Electronics Repair! website.Here you will find:Service Modes, Circuit Diagrams,Service manuals, Firmware Update procedure, Disassemble procedure, Universal remote control setup codes, Troubleshooting, Diagnosing, Measuring, and more.... of many of LCD/LED TV/Displays,others various electronic apparates,trough many technical notes and tips/tricks to help repairing/fixing Troubles/ faults,for electrical technicians.This site helps you to save the Earth from electronic waste!

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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Tuesday, 5 March 2019

SONY HOME THEATRE SYSTEM - SA-ST7 - HT-ST7 - TEST MODE – COLD RESET – AMP TEST – DSP SURROUND CHECK – SMPS POWER SUPPLY CIRCUIT - STR-Y6766 - AUDIO SYSTEM REPAIR AND SERVICE

SONY HOME THEATRE SYSTEM - SA-ST7 - HT-ST7 - Test mode – cold reset – amp test – DSP surround check – SMPS power supply circuit - STR-Y6766 - Audio System Repair and service

Category: Audio system Repair and Service

Contents of this article

How to activate test mode
Factory reset procedure
Power supply circuit

SONY SA-ST7 - HT-ST7

TEST MODE

TEST MODES OTHER THAN THE TEST MODE MENU
These are executable test mode even if not entering the test mode menu.
Cold Reset
It can initialize various backup information.
Procedure:
1. Press the [POWER] button to turn the power on.
2. Press the three buttons of the [INPUT], [VOLUME –] and [POWER] simultaneously.
3. The message “RESET” is displayed on the fluorescent indicator tube, then turn the power off.

TEST MODES IN THE TEST MODE MENU
These are the test modes done in the test mode menu.
Setting method of the test mode menu:
1. Press the [POWER] button to turn the power on.
2. Press the two buttons of the [INPUT] and [VOLUME +] simultaneously for five seconds.
3. The message “PANEL” blinks on the fluorescent indicator tube and enter the test mode menu.

Releasing method of the test mode menu:
Press the [POWER] button to release the test mode menu.

Panel Test Mode
It can confirm the lighting of fluorescent indicator tube and LEDs,
operation of buttons, display of model name, destination and software version.
Procedure:
1. Enter the test mode menu.
2. In the state of blinking the “PANEL” on the fluorescent indicator tube, press the [INPUT] button.
3. All segments in the fluorescent indicator tube and all LEDs are lighted up.
4. When pressing the [VOLUME +] button, the display on the
fluorescent indicator tube repeatedly changes in order from all lighting > pattern 1 (power indicator LED (white color) is lighted up) > pattern 2 (Bluetooth indicator LED (blue color) and [MUTING] LED are lighted up).

5. In the state of step 4, press the [VOLUME –] button and “K 0” is displayed on the fluorescent indicator tube.

Each time a button is pressed, “K 0” value increases. However, once a button is pressed, it is no longer taken into account. When pressing the all buttons, “OK” and “K 5” are alternately displayed on the fluorescent indicator tube.

6. In the state of step 4, press the [INPUT] button and model name “HT-ST7” is displayed on the fluorescent indicator tube.

Each time the [VOLUME +] button is pressed, the display changes from destination > MC (m-com) version > SY (system) version > UI version > TA (AMP) version > DS (DSP) version > BT (Bluetooth) version > NF (NFC) version > HD (HDMI) version, > CE (CEC) version > PF (platform) version > WS (wireless sound) version in this order, and returns to the model name display.

7. When [INPUT] button is pressed while the each version is displayed on the fluorescent indicator tube, year, month and day of the software creation is displayed on the fluorescent indicator tube.

When [INPUT] button is pressed again, the display returns to the each version display.

Releasing method:
Press the [POWER ] button to release the test mode menu. (When the “K 0” to “K 4” is displayed on the fluorescent indicator tube, press the [POWER] button on the remote commander to release the test mode menu)
Model Name Display Mode
It can display the model name.
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “HT-ST7”

Destination Display Mode
It can display the destination.
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the destination.

MC Version Display Mode
It can display the MC (m-com) version.
Procedure:
1. Enter the test menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “MC.X.XXX” (X.XXX: MC (m-com) version).

Serial Flash Version Display Mode
It can display the SF (serial flash) version.
Procedure:
1. Enter the test menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “SF.X.XXX” (X.XXX: SF (serial flash) version).

DSP Sound Number Display Mode
It can display the SN (DSP sound number) number.
Procedure:
1. Enter the test menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “SN XXX” (XXX: DSP sound number (000 to 998)).

Note: “SN ---” is displayed when the information of serial flash is not able to be acquired.

BT Module F/W Version Display Mode
It can display the BT (Bluetooth) module firmware varsion.
Procedure:
1. Enter the test menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “BTM.X.XX” (X.XX: BT (Bluetooth) module firmware version).

AMP Test Mode
(It is displayed “AMP” on the fluorescent indicator tube) Not used for the servicing.
Press the [POWER] button if having entered this mode.
Tone Test Mode
It can confirm the test tone output from each speaker.
Preparation:
Connect the Subwoofer (SA-WST7) and the Sound Bar (SA-ST7) by wireless.
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “T TONE”, press the [INPUT] button.
3. The message “TONE.ON” is displayed on the fluorescent indicator tube momentarily and enter the tone test mode.

4. The output speaker is displayed on the fluorescent indicator tube. At the same time, test tone is output from speaker. (The output speaker repeatedly changes automatically in following order)

Output speaker	Display
Front L-ch	L3
Surround Back R-ch	R1
Surround L-ch	L2
Surround R-ch	R2
Surround Back L-ch	L1
Front R-ch	R3
Center	C
Subwoofer	SW

Releasing method:

Press the [POWER] button to release the test mode menu.
Speaker Test Mode
(It is displayed “SPK.TST” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
VACS Display Mode
(It is displayed “V. DISP” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
VACS ON/OFF Mode
(It is displayed “V.ONOFF” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
DSP Halt Mode
(It is displayed “DSP.HLT” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
DSP Serial Flash Update Mode
(It is displayed “SF UPD” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
Stream Information Mode
(It is displayed “STREAM” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
HDCP Key Read Mode
(It is displayed “HDCP” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
NFC Test Mode
(It is displayed “NFC.TST” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.

Wireless Sound Test Mode
It can display the m-com version of Subwoofer (SA-WST7).
Note :More than one item may be displayed on the fluorescent indicator tube, but it is not used for the servicing other than “VER.CHE”.
Preparation:
# Prepare the remote commander attached to this unit.
Remote commander:
RM-AMU164
# Connect the Subwoofer (SA-WST7) and the Sound Bar (SAST7) by wireless..
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “WS TST”, press the [INPUT] button.
3. The message “QUALIT” is displayed on the fluorescent indicator tube momentarily and enter the wireless sound test mode.
4. Press the [UP ]/[DOWN] buttons on the remote commander, select the “VER.CHE”, and press the [ENTER] button on the remote commander.
5. The m-com version of Subwoofer (SA-WST7) is displayed on the fluorescent indicator tube.

6. When [UP]/[DOWN] buttons on the remote commander is pressed while the m-com version of Subwoofer (SA-WST7) is displayed on the fluorescent indicator tube, year, month and day of the creation is displayed on the fluorescent indicator tube.

When [UP]/[DOWN] buttons on the remote commander is pressed again, the display returns to the m-com version of Subwoofer (SA-WST7) display.
Releasing method:
Press the [POWER] button to release the test mode menu.

Wireless Sound Cold Reset
It can initialize various backup information of Subwoofer (SAWST7).
Preparation:
Connect the Subwoofer (SA-WST7) and the Sound Bar (SA-ST7) by wireless.
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “WS RST”, press the [INPUT] button.
3. The [POWER] indicator LED on the Subwoofer (SA-WST7) turns red and flashes, then turns on yellow.

4. Pull out the power cord on the Subwoofer (SA-WST7) from an outlet and insert the power cord again.
Cold Reset
It can initialize various backup information.
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “RESET”, press the [INPUT] button.
3. The message “RESET” is displayed on the fluorescent indicator tube, then turn the power off.