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I have a Bose SP1 professional Amplifier with a dead switch mode power supply and need a circuit diagramme please.

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My Bose radio/cd player (02273c03437299a) seems dead! It's plugged in... No clock, no radio, etc..... What now? A 9 volt battery does nothing.


Various problems may cause no power condition: Dead AC transformer; defective power regulation circuitry; dead microprocessor or display electronics; liquid damage; cracked circuit board; open current limiting resistors .. and more. If needing professional service, Ship radio and contact info to:

CET Services
117 Windsor Ave
Hurley, WI 54534

Their Certified Tech Repairs These Units, average
cost between $100 to 145 plus return shipping to repair all problems,
replace all defect parts, clean inside and out, and adjustments.

Jan 12, 2016 | Bose Audio Players & Recorders

1 Answer

Why do my Bose MB4s fade out when cranked up


There are many issues that can cause this. It could be a Power Supply, Amplifier, or scores of other issues. All these units have a microprocessor(computer inside the Bose unit) and are generally controlled with a Rotary Encoder( basically a volume control), or buttons. There are just too many problems that can cause this same issue; dead or won't switch or with indicators blinking.

If you're interested in repairing your unit, please visit my website at audioserviceclinic.com. Thank you.

Oct 10, 2014 | Bose Mb4 Panaray Bass Speaker/subwoofer...

1 Answer

My speakers just stopped working. No power when I turn know to turn on and increase volume


Ir you are lucky it will be your power supply that's gone dead. Use a volt meter to see if the power supply is working or try to find a power supply with the same characteristics (voltage, polarity and amperage). If that doesn't work, the amplifier may be busted. If so you'll need new speakers.

Apr 18, 2014 | Bose Companion 2 Computer Speakers

3 Answers

My bose cinemate 1 sr has a flashing red light and no sound. does not change to green light with sound.


This is a powered sub-woofer, with a complementary sound bar. The amplifier for the sub and the sound bar, are in the sub cabinet. Because there are multiple speakers in the sound bar and sub, there are multiple amplifiers to run them. If any, or all of the amplifiers are damaged, they generally have a condition known as DC Offset. There are sensor transistors on each of these amplifiers, which will "report" a damaged amplifier condition back to a microprocessor(computer inside the Bose system). When this damaged condition is identified, the amplifier will shut down the system, and that red indicator will flash. You will need a professional, audio specific technician, as this is not a DIY repair.

If any of you are interested in having your systems repaired, please contact me from my website, audioserviceclinic.com. Just FYI, this is not a Bose specific issue. The same problem can occur with any amplifier, any brand. Thank you.

Jan 17, 2013 | Bose Cinemate 1 Sr Speaker System

1 Answer

How to add secon subwoofer to my lifestyle bose system?


You cannot add a second sub woofer to your Bose system unless you are very well versed in electronics and would like to tamper with the internal electronics of the Bose module. Unlike other systems the 6 channel amplifier ( 5 + 1sub ) and its crossover electronics + power supply unit is built into the Bose bass module. The circuit uses very small surface mounted devices with double sided pcb ). And even a professional technician might refuse this work in fear that he may damage the whole unit itself !!!!.

Mar 19, 2011 | Bose Lifestyle 12 System

2 Answers

Geting a buzz sound out of my bose v20


Can you kindly let me know when this problem started what you were doing and whats the current situation.

Feb 27, 2011 | Bose Lifestyle 20 System

1 Answer

`Which ampliphier is compatible for my Bose 901 series 6 with equilazer.


Ideally, an amplifier or receiver should have either a "Tape Monitor" selector switch and Tape Input & Tape Output jacks, OR have Preamp Output & Amp Input jacks to enable insertion of the Bose Active equalizer into the circuit before the amplifier stage. Power requirements - according to the 901 Series VI manual:

"Your 901 speakers are designed to work compatibly with receivers or amplifiers rated from
10 to 450 watts per channel."

If you have questions not answered by the manual, you can contact customer service at The Bose Corporation in Framingham, MASS toll free at:

1-800-999-2673
Hours of operation:
7 AM - 2 AM ET, 7 days a week

I hope this helped & good luck!

Nov 22, 2010 | Bose 901 VI Main / Stereo Speaker

1 Answer

I have a 2005 Maxima, the other day I heard a pop sound and my bose stereo system (the sound) stopped working. My son replace the AMP but still no sound. Everything else is still working, ie the display...


did you mean that the output was replaced or the whole amplifier?
The pop sound along with the sound loss can be attributed to a failure of a component , most possible is a capacitor when the aluminium top bursts. So open the amplifierr to look for pieces of the component that burst out and you can piece up them to confirm.
The powerr to the section can also be faulty or open due to this so the voltage must be checked to be in order.
The possible area can be the power supply circuit or the output of the amplifier.
Test from the power supply section down to see the power into the preamp and power amplifier output section. make sure that the input selectors are also working in the command of the main controller.
Checck only with some knowledge of these circuits otherwise take help.

Aug 31, 2010 | Bose Wave Music System Remote

2 Answers

Bose Companion 5 110v/220v short circuit


The fact that everything but the power amp is still working, it could be only a fuse protecting the output that needs replacement although this fuse is probably circuit-wise after the main fuse you have already replaced and could be soldered on the board. Worst case, the output modules are blown and require replacement and depending on the power level it may be worth repairing instead of replacing.
Most modern electronic devices can be set or adapted to line voltages from 100-240 Volts and a good percentage of the devices, using the common switched mode power supply don't need any changes made by the user since they can be inherently 'auto-ranging.'

Apr 04, 2010 | Bose Companion 5 Multimedia Speaker System...

2 Answers

My Sony XMGTR2022 goes into protect mode at


I discovered that there is a compatiblilty problem between the Bose receiver and the Sony amplifier. If I disconnect the receiver from the amp then the amp starts up normally. Apparently the receiver sends out a dc offset or a "thump" that the amplifier doesn't like and goes into protection mode. I solved the problem by putting a 1 second delay circuit between the receiver startup and the amplifier startup. A simple RC delay on the remote input to the amplifier solved the problem.

Sep 03, 2009 | Sony Xplod 1200W Class AB Bridgeable 2-Ch....

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