Question about Audio Shelf Systems

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PROTECT on start up

I have the model CD-BA 2600. When we turn the power on is displays PROTECT on the screen and nothing works.
I have disconnected all speaket and antenna connections and unplugged it, but still no luck. Serial number is: 10529981

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  • Anonymous Jan 17, 2009

    i got the same problem and i iveen know how to fix can you help me

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  • 4,234 Answers

The protect message indicates that the output amplifier section has a problem and the unit has shutdown to prevent further damage. This usually is caused by shorted transistors in the final output stage. In your case, the output amplifier is a single replaceable amp-pac (STK402-090S). This can be purchased from tritronicsinc.com using the Sharp part number: VHISTK4029S-1 at a cost of $63.32

Dan

Posted on Jul 14, 2008

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1 Answer

Protect is displayed on the unit. I know it is a speaker wire. Do I unplug all speaker wires and then plug in one at a time and turn unit on and repeat till I find the bad wire??? Please advise. System is ...


Why are you asking instead of doing?

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.

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

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Hi Lois,
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