Blaupunkt VOSS schematic for portable Bluetooth speaker repair

User question

“Blaupunkt VOSS schematic”

Artificial Intelligence Response

Direct answer to the question

I could find a Blaupunkt VOSS instruction/user manual, but I did not find a publicly available service schematic / circuit diagram for the Blaupunkt VOSS. The VOSS appears to be a portable Bluetooth speaker, not a Blaupunkt car-radio chassis. It was sold as a rechargeable Bluetooth system with two 10 W speakers, AUX input, USB 5 V output, and an internal rechargeable battery. (cybershack.com.au)

Detailed problem analysis

The available VOSS manual gives useful service clues, but it is not a component-level schematic. The relevant electrical information from the manual is:

Item	Data from available manual
Product	Blaupunkt VOSS Bluetooth speaker
Bluetooth	Bluetooth V3.0 + EDR
RF band	2.402–2.480 GHz
Wireless range	approx. 10 m
Power input	DC 10 V, 2 A
Internal battery	DC 7.4 V / 1000 mAh rechargeable battery
Rear connections	AUX IN, DC 10 V IN, DC 5 V OUT
AUX input	3.5 mm analog audio
USB port	5 V output for charging devices, not USB audio playback

These specifications are listed in the VOSS instruction manual. (manualmachine.com)

A likely internal block diagram would be:

DC 10 V adaptor input
|
charge / power-management PCB
|
2-cell Li-ion / Li-poly battery pack
nominal 7.4 V, with protection/BMS
|
DC/DC rails: 5 V, 3.3 V, amplifier rail
|
Bluetooth audio module / control logic
| |
AUX input buttons / LEDs
|
audio preamp / selector
|
Class-D stereo amplifier
|
left/right loudspeakers

Practical repair guidance without the schematic

If you are repairing one, the most useful first checks are:

1. No power

Check:

• DC adaptor output: should be close to 10 V DC.
• DC input jack solder joints.
• Reverse-polarity or input protection device near the DC jack.
• Battery voltage:
  • Healthy 2-cell Li-ion pack: typically about 6.0–8.4 V depending on charge.
  • If much below 6 V, the protection circuit may have latched off or the cells may be over-discharged.
• Local regulators:
  • 5 V rail.
  • 3.3 V rail for Bluetooth/control ICs.

2. Runs on adaptor but not battery

Likely causes:

• Failed 2S battery pack.
• Open thermal fuse / protection PCB.
• Faulty charge IC.
• Bad battery connector or cracked solder joint.

Do not bypass the battery protection board. The VOSS uses a 7.4 V rechargeable pack, which implies a 2-cell lithium battery system; unsafe charging or bypassing protection can cause overheating or fire.

3. Bluetooth pairs but no sound

Check:

• AUX/Bluetooth mode selection.
• Audio signal at amplifier input.
• Class-D amplifier supply voltage.
• Speaker continuity.
• Muting / shutdown pin of the amplifier IC.

4. AUX works but Bluetooth does not

Likely Bluetooth module/control-side problem:

• 3.3 V regulator.
• Bluetooth module reset line.
• Crystal/clock oscillator.
• Antenna or RF module fault.
• Corrupt or failed Bluetooth module.

5. USB 5 V output not working

The manual notes that the USB port is for charging/powering devices and is not for USB flash-drive playback. It also indicates that charging external devices depends on the power condition of the unit/adaptor. (manualmachine.com)

Check:

• 5 V boost/buck regulator.
• USB output current-limit switch.
• USB connector damage.
• Whether the unit requires the AC adaptor connected for USB output operation.

Important clarification

If by “Blaupunkt VOSS schematic” you mean a car radio, then “VOSS” is probably not the correct Blaupunkt radio model name. Blaupunkt car radios are usually identified by a model name plus a numerical part/type number, often beginning with 7 6xx xxx xxx or similar. In that case, the correct schematic must be searched by the Blaupunkt type number, not just the name.

For the portable VOSS speaker, the public documentation I found is an instruction manual, not a service manual or full schematic. The current Blaupunkt support page provides manuals and service contact information, but it does not list a VOSS circuit schematic in the visible download area. (blaupunkt.com)

What I need to help further

If you want, send any of the following and I can help reconstruct the schematic or identify ICs:

• Photo of the main PCB, both sides.
• Markings on the amplifier IC.
• Markings on the Bluetooth/audio module.
• Battery pack label.
• Fault symptom: no power, no charge, no sound, distorted sound, Bluetooth failure, etc.
• Measured voltages at:
  • DC input jack.
  • Battery terminals.
  • 5 V rail.
  • 3.3 V rail.
  • Amplifier supply pin.

Brief summary

A public Blaupunkt VOSS schematic does not appear to be readily available. The available documentation identifies VOSS as a portable Bluetooth speaker with DC 10 V input, 7.4 V / 1000 mAh internal rechargeable battery, Bluetooth V3.0 + EDR, AUX input, and USB 5 V output. For repair, the practical route is PCB-level tracing: start with the DC input, battery/BMS, regulators, Bluetooth module, and Class-D amplifier stage.

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.