Vacuum tube (valve) amplifier circuit diagram using Valves EF86, 12AX7, 6L6, ECC83 and using power transistors 2N3055

 

Power amplifier using EF86, 12AX7, 26I6GC  Valves (Vintage sets)

Power amplifier using 2N3055 Power transistor

Yamaha WIRELESS SUBWOOFER NS-WSW42 how to update the software, protection details, error codes, schematic (Circuit diagram)

 

FRONT SURROUND SYSTEM YAS-207 or ATS-2070

CENTER UNIT YAS-CU207orATS-CU2070

When accepting a repair order from the user, it is recommended to receive the YAS-CU207/ATS-CU2070 and NS-WSW42 as a set for the repair work.

Turning on the power to YAS-CU207- ATS-CU2070 makes wireless connection of YAS-CU207- ATS-CU2070 and NS-WSW42 possible. After the repair work, if their wireless connection is not made automatically, makes
it possible manually. (For details, refer to “PAIRING THE CENTER UNIT AND SUBWOOFER MANUALLY”.)

Lithium batteries: CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.

YAS-CU207 - ATS-CU2070 - NS-WSW42 updating firmware

When the following part is replaced, the firmware must be updated to the latest version.
MAIN P.C.B.

Confirmation of firmware version
* It is not possible to check the firmware version before and after updating the firmware.

Initializing the back-up IC

After updating the firmware, the back-up IC MUST be initialized by the following procedure store the setting information properly.

Connect the power cable of this unit to the AC outlet and turn off the power.
Then, while touching the  (volume –) key, touch the  (power) key, and all indicators will flash and initialization will be completed.

Required Tools
• USB storage device
(For USB2.0 High speed)
• Latest firmware

Preparation
1. Download the latest firmware from the specified
download source to the folder of the PC.
2. Copy the latest firmware from the PC to the root
folder of the USB storage device.
Note: When the latest firmware is copied to a subfolder of the USB storage device, the update will not proceed.

Operation Procedures
* Disconnect the power cable of this unit from the AC outlet.
1. Insert the USB storage device to the UPDATE ONLY jack.
2. Connect the power cable of this unit to the AC outlet.
3. Turn off the power of this unit. (Fig. 1)
4. Keep touching the  (volume –) and  (power) keys until the CLEAR VOICE indicator flashes.
Update of the firmware starts automatically.

(If writing of the firmware has failed, disconnect the power cord from the AC outlet and perform the firmware updating procedure again from the beginning.)

5. When writing of the firmware is completed, all indicators flash.
6. Touch the  (power) key to turn off the power.
7. Remove the USB storage device from the UPDATE ONLY jack.

List of error display

Protection display

If there is anything abnormal with this unit, its protection function works to turn off the power even if it is turned on.
Touch the (power) key again to turn on the power, and the DD / DTS indicator indicates the causal factor of the protection function.

Flashing pattern
For the protection function display, the same flashing pattern is repeated 5 times.

Schematic diagram