SONY HT-CT770 home theater sound bar service mode adjustments and power supply schematic

Sony HT-CT770  home theater sound bar service mode adjustments and power supply circuit 

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 [POWER] button for ten seconds.
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 [VOL +] 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 [VOL +] button, the display on the fluorescent indicator tube repeatedly changes in order from all lighting > pattern 1 (lamp LED (white color) is lighted up) > pattern 2 (lamp LED (blue color) are lighted up).

5. In the state of step 4, press the [VOL –] 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 “CT770” is displayed on the fluorescent indicator tube.

Each time the [VOL +] 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 ModeIt can display the model name.
Procedure
1. Enter the test mode menu.
2. Press the [VOL +]/[VOL –] buttons to select the model name “CT770”.

Destination Display Mode
It can display the destination.
Procedure:
1. Enter the test mode menu.
2. Press the [VOL +]/[VOL –] 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 [VOL +]/[VOL –] 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 [VOL +]/[VOL –] 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 [VOL +]/[VOL –] 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 version.
Procedure
1. Enter the test menu.
2. Press the [VOL +]/[VOL –] 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 Bar Speaker (SA-CT770) and the Subwoofer (SAWCT770) by wireless.
Procedure
1. Enter the test mode menu.
2. Press the [VOL +]/[VOL –] 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  …………FL
Front R-ch …………FR
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.
User Update Mode
(It is displayed “UPDATE” 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.
Auto Standby Test Mode
It can change the auto standby time for 3 minutes or 20 minute.
Procedure:
1. Enter the test mode menu.
2. Press the [VOL +]/[VOL –] buttons to select the “T. STBY”, press the [INPUT] button on the main unit.

3. The message “20 MIN” or “3 MIN”is displayed on the fluorescent indicator tube, press the [VOL +]/[VOL –] buttons to change the auto standby time.

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

Sony Sound bar HT CT770 Wireless Sound Test Mode

It can display the m-com version of Subwoofer (SA-WCT770).
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-ANP114 (US and Canadian models)
RM-ANP115 (Except US and Canadian models)
• Connect the Bar Speaker (SA-CT770) and the Subwoofer (SAWCT770) by wireless.
Procedure:
1. Enter the test mode menu.
2. Press the [VOL +]/[VOL –] buttons to select the “WS TST”, press the [INPUT] button.
3. The message “FACTRY” is displayed on the fluorescent indicator tube 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-WCT770) 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-WCT770) 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-WCT770) 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 (SAWCT770).
Preparation:
Connect the Bar Speaker (SA-CT770) and the Subwoofer (SAWCT770) by wireless.
Procedure:
1. Enter the test mode menu.
2. Press the [VOL +]/[VOL –] buttons to select the “WS RST”, press the [INPUT] button.
3. The power indicator LED on the Subwoofer (SA-WCT770) turns red and flashes, then turns on amber.

4. Pull out the power cord on the Subwoofer (SA-WCT770) 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 [VOL +]/[VOL –] buttons to select the “RESET”, press the [INPUT] button.
3. The message “RESET” is displayed on the fluorescent indicator tube, and then turn the power off.

Power supply schematic