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Techwood DDR94A stereo

Techwood DDR94A gives "protect" message

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  • Bob Wheatley
    Bob Wheatley Apr 08, 2008

    Were can one find operators and/or service manuals for Techwood stuff. . .

  • Anonymous Apr 09, 2008

    im getting a protect message then it shuts off , check all wires and plugs, even replaced the surge protector, this happened once before and cant remember how i fixed it

  • mackash Dec 19, 2008

    I'm getting a protect message and then it shuts off. Everytime try to power on it repeats the message.

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I found the manual to the Techwood DDR94A at diplodocs.com

Posted on Jun 15, 2010

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A problem has been detected in the final stage of the output amplifier. Remove the speaker wires and try again. If the problem persists, it is inside the amp. The most common cause of this is the output transistors. Expect a parts cost of between $15-$25 plus the local labor rate for the repair.
Dan

Posted on Apr 08, 2008

  • ABRsvcs Apr 08, 2008

    You will need to search the web for service manuals, but I don't believe that they are available. Techwood systems use rather standard designs and are relatively easy to repair for anyone that has done a lot of audio repair. If you feel you would like to try it, look for the large transistors that are mounted to the heatsink and remove them (marking the heatsink so you know where to put them back). With the unit turned on, it should not display protect anymore. Using a volt meter, measure the voltage on each of the 3 pads for each transistor. You should read the following: (0.0V, +/-0.6V, and +/- B). The B here will be over 24V and probably in the range of 50 or more. If these readings are as stated, replace the transistors and the unit will be fixed.

    Good luck.

    Dan

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1 Answer

Ddr94a techwood


This receiver has 100 watts per channel. If b side speakers aren't working you may have them hooked up wrong. Try connecting the B speakers to A terminals to make sure speakers are functioning. Please see the user manual below for wiring diagrams.
http://weltonusamanuals.s3.amazonaws.com/omddr94.pdf

Mar 30, 2014 | Audio Players & Recorders

1 Answer

Why does stereo say protect


Check if a speaker wire come off or some other wire, That will cuase it to go into the protect mode,Allso if you have a amp hooked up to it, End continully have the music cranked up the system will over heat ,That can cause it allso to go into protect mode, There is a reset button on the face plate but it is not marked,

Nov 02, 2012 | Kenwood KDC-248U In-Dash CD, MP3, WMA Car...

1 Answer

My stereo sysytem is a mini stereo: serial number 10200055. It currently says "protect", what is this and how do we return our system to normal operations?


Hi there,

When the word PROTECT appears on this display, this means the unit has detected a critical fault which could potentially cause harm to your stereo system.

The most common cause is a short circuit somewhere - something even as simple as loose speaker wiring could cause a short, triggering the Protect message.

You will need to determine if there is a possible short somewhere, so I recommend you start by firstly turning power OFF, disconnecting all speaker wires, then turn unit back ON.

Operate the stereo (without speakers) and turn volume up:
  • If Protect message appears when turning volume up, then stereo unit itself has an internal fault
  • If no Protect message appears, then suspect the speakers may be causing the issue.
  • Reduce volume and turn unit OFF
Re-connect speakers (ensure the connections are secure), turn unit ON:
  • If turning volume up triggers the Protect message again, there is an issue with the speakers or connections

Hope this helps.....

Sep 04, 2011 | Kenwood Audio Players & Recorders

1 Answer

I have a techwood digital reciever ddr94 the :protected light comes on then the power shuts off. what is the problem?


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Jul 08, 2011 | Audio Players & Recorders

1 Answer

Techwood prostudio 400 watt home theater system shuts off by itself what could it be


Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Feb 27, 2011 | Audio Players & Recorders

1 Answer

I have a Techwood reciever. I need to replace the motor for the fan. Please tell me where I can order this part! Thanks a bunch! Diana


I believe that Techwood is no longer in business. You could try electronics site such as mcm electronics or encompass electronics for a fan.

Feb 09, 2011 | Audio Players & Recorders

1 Answer

Overload signal


The overload is the same as protect mode. Remove the speaker wires and turn the unit back on. If the message remains, there is a problem internal to the unit in the final stage of the amp.

Please let me know the results of the test above.

Thanks,
Dan

Mar 02, 2009 | Technics Audio Players & Recorders

1 Answer

Harman Kardon AVR 245 Receiver PROTECT Error Message/Shutting Down All Equipment


could be your receiver only, it has tripped due to discrepancy on the output stage of your amp. that cracking sound in one of your speakers could have caused the trouble. it is possibly shorted. but in your case it could have damaged already the amp that;s why it would not turn on. normally it will first trip, turn on then turns off. but to stay off and not to turn on again is major problem of the amp. or maybe it emanated from miscabling, probably the ceiling speakers got connected to a high output or main amp. but try removing all speakers first then turn the unit on. see if it does power up.

May 22, 2008 | Harman Multimedia AVR 245 7.1 Channels...

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