Thursday, February 04, 2016

SONY sound bar - HT-CT180 - SA-CT180 – Test mode – Factory reset – Demo mode – SMPS power supply schematic – TOP256EN - Power amplifier circuit – STA339BW - Audio system repair and service

Category: Audio System Repair and Service 

Contents of this article 

  • Test mode
  • Factory reset 
  • SMPS Power supply circuit 
  • Power amp circuit 

SONY HT-CT180 - SA-CT180

The check of the software version can be performed.
1. Press the [POWER] button to turn the power on.
2. Press three buttons of the [INPUT], [VOL+] and [VOL−] simultaneously for 2 seconds.
3. When enter the version display mode, the software version is shown by the frequency of blinking of each LED.
LED showing the software version
Software version
Minor version (Lower) (BLUETOOTH function LED)
Minor version (Upper) (ANALOG function LED)
Major version (OPTICAL function LED)
Example: When the software version is “1.02”
OPTICAL function LED is blink once.
ANALOG function LED is not blink.
BLUETOOTH function LED is blink twice.
4. When the version display is finished, return to the normal
It can clear all settings and the Bluetooth pairing history to initial conditions. Execute this mode when returning this unit to the customer.
1. Press the [POWER] button to turn the power on.
2. Press three buttons of the [INPUT], [VOL−] and [POWER] simultaneously for 5 seconds.
3. Blink three times all LEDs, then lights up all LEDs. When the reset is complete, all LEDs light off and becomes the standby status.
The demo mode can be performed.
(This mode is used by shop front)
1. Press the [POWER] button to turn the power on.
2. Press two buttons of the [INPUT] and [VOL−] simultaneously for 5 seconds.
3. When enter the demo mode, ANALOG function LED is blink twice quickly, then changed to the setting of initial value for demo mode.
Analog led blink twice quickly
Initial value for demo mode:
Function : OPTICAL
Volume : 25
Muting : OFF
Sound field : CLEAR AUDIO+
Night mode : OFF
Voice : OFF
Subwoofer volume : 10
Dual mono : MAIN
Note 1: When demo mode is “ON”, the operation of the [POWER ] button on the unit, and the operation of the [POWER] and [INPUT] buttons on the remote commander is invalid.
Note 2: When the non-operation and no sound for five minutes is followed, setting will return to the initial value for demo mode.
Releasing method:
Perform the “FACTORY RESET”.
Note: The demo mode does not release by unplug the AC cord.
TOP256EN Integrated Off-Line Switcher
TOPSwitch-HX cost effectively incorporates a 700 V power MOSFET, high voltage switched current source, PWM control, oscillator, thermal shutdown circuit, fault protection and other control circuitry onto a monolithic device.
Notes for Table 1:
1. Minimum continuous power in a typical non-ventilated enclosed adapter measured at +50 °C ambient. Use of an external heat sink will increase power capability.
2. Minimum continuous power in an open frame design at +50 °C ambient.
3. Peak power capability in any design at +50 °C ambient.
4. 230 VAC or 110/115 VAC with doubler.
5. Packages: P: DIP-8C, G: SMD-8C, M: SDIP-10C, Y: TO-220-7C, E: eSIP-7C, L: eSIP-7F. See part ordering information.
6. TOP261 and TOP262 have the same current limit set point. In some applications TOP262 may run cooler than TOP261 due to a lower R DS(ON) for the larger device.
Pin Functional Description
DRAIN (D) Pin:
High-voltage power MOSFET DRAIN pin. The internal start-up bias current is drawn from this pin through a switched highvoltage current source. Internal current limit sense point for drain current.
Error amplifier and feedback current input pin for duty cycle control. Internal shunt regulator connection to provide internal bias current during normal operation. It is also used as the connection point for the supply bypass and auto-restart/ compensation capacitor.
EXTERNAL CURRENT LIMIT (X) Pin (Y, M, E and L package):
Input pin for external current limit adjustment and remote ON/OFF. A connection to SOURCE pin disables all functions on this pin.
VOLTAGE MONITOR (V) Pin (Y & M package only):
Input for OV, UV, line feed forward with DCMAX reduction, output overvoltage protection (OVP), remote ON/OFF and device reset. A connection to the SOURCE pin disables all functions on this pin.
MULTI-FUNCTION (M) Pin (P & G packages only):
This pin combines the functions of the VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) pins of the Y package into one pin. Input pin for OV, UV, line feed forward with DC.