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Why Harman Kardo HK 3490 goes into DSP voltage protect mode


This amplifier can go into protection if one of the low ohm resistors on the power module that is soldered to the transformer is defect. Check out R951 and R952, they are both 0R47 (0,47ohm). They are often broken and measure some kilo ohms.

Apr 29, 2014 | Harman Kardon HK 3490

1 Answer

Need Help


I think you've answered your own question, circuit power is not going from one side of the DSP chip to the other and that suggests that the DSP's core is at-least partly DOA. You are indeed correct that functional power should be at 3.3V and yes 0.3V does make a difference to the components that rely on a 3.3V feed, however if the DSP is fried you are not going to see normal functionality or be able to diagnose further.

Sep 04, 2007 | Audio Players & Recorders

1 Answer

Yamaha DSP-AX1 ,. When turning on it only stays on about 4-5 sec. then shut off. Bob


Is this new equipment or a new problem on working equipment?


Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Yamaha-DSP-AX1-Amps-manual/id/319bh827/t/2/

See Troubleshooting Page 79

Impedance Selector in between settings

Generally speaking, an amp protects 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.

Apr 07, 2011 | Yamaha DSP-AX1 10-Channel Amplifier

1 Answer

My Yamaha DSP A1 after switching ON goes OF itself after 2-3 seconds! Please give me advice what to do Thanks, Alex


Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Yamaha-DSP-A1-Amps-manual/id/319ag811/t/2/

See Page 73 Troubleshooting.

Generally speaking, an amp protects 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.

Mar 06, 2011 | Yamaha DSP-A1 Receiver

1 Answer

I have an amplifier DSP A 1000. When I turn it on it always working for a while, sometimes 1 hour sometimes just 15 minutes then turned off by it self. which circuit I should check?


Is it getting hot?

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 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 hands-on tech.


Check for loose speaker connections as a root cause for intermittent shutdown.

Feb 14, 2011 | Yamaha DSP-A1000 5-Channel Amplifier

1 Answer

Just bought refirb. Onkyo 805, hooked up front l&r plus sub and getting no sound. I set up am and fm as per manual and connected a cd changer thru the cd in via rca cables. Radio shows a signal but no...


After few sec when you turn on your receiver did you hear a click noise ? if yes your receiver is OK not in protection mode if no click noise is output protection in that case you must return where did you buy for service and update firmware a lot of update
However you can reset your receiver and debug the DSP section ( digital signal processor ) as follow
To reset
1. Press and hold down VCR/DVR button, then press STANDBY/ON button when the unit is Power on.
2. After " Clear " is displayed, the preset memory and each mode stored in the memory are initialized and will
return to the factory settings, and turn to Standby mode.
Now turn back on and check if it work or not and make sure check input mode such as analog or coaxial or optical input if stil no sound then debug DSP as follow
To set in DSP debug mode
1. Press and hold down DISPLAY button, then press STANDBY/ON button while the unit is powered ON.
The version number of m icroprocessor is displayed only for 3 seconds.
Main:
8 1.05/07903A
2. Press TONE+ button within 3 seconds above, the version number of 1st DSP is displayed.
DSP 1st:
SR8051:07601A
3. Press DISPLAY button while the 1st DSP version is displayed. The status of DSP and DIR will be displayed.
E1A48K0N/0FFPo
FFFFFF0 0 000
To exit
Press STANDBY/ON button.
Then unplug the unit for 30 sec then plug in it should work now if not you need to return it to 1 of the service center Onkyo in your town to repair it
Good luck

Nov 30, 2008 | Onkyo Audio Players & Recorders

1 Answer

Dsp-a1000 dead


output stage problem, systems trips due to protection. have the power amp transistors checked. the rotating of function switch is normal, its like a routine system check

Jun 22, 2008 | Yamaha DSP-A1000 5-Channel Amplifier

1 Answer

Auto Shut Off After 3 Seconds...?


either your DSP output stage already damaged or maybe your speakers. have it both chekced for short. or worst both of them. DSP A1000 can drive as low a 4ohms on main channels but how is the power handling of your speakers? are you sure it has not exceeded the capacity of the speakers? or maybe you have over driven the speakers and they are still ok but your amp gut busted due to over drive. If the DSP amp is busted then it is due for replacement of power transistors and drivers. you can not disable the protection circuit. at least the design. it can be disabled by a tech person with a lot of modifications but i wont go for that or it can cause more damage to your equipments. i am from yamaha before and i have made conversions of protection circuits but it is too risky.

Jun 13, 2008 | Yamaha DSP-A1000 5-Channel Amplifier

2 Answers

Dsp protection


Resetting- taken from the user manual:

Jan 27, 2006 | Samsung HT-DB600 System

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