My teac ag-790a 'protect' error message on display. When I brought it to the audio shop for repair it worked fine; at home again the same problem? What is the problem? Tx.

You could try searching on on google

When you check the voltage at the plug, make sure you have a 100 watt lamp plugged in and ON. Then measure the voltage. Most of todays meters are so sensitive that unless you have a load present, a loose terminal may not be recognized. If you don't have a meter, another way to check is to plug in many lamps into the same socked by using a power bar. Turn one on, and then another, and then another, etc. If the lamps start to noticibly dim as you turn on another lamp, you definately have a problem with the wiring from the panel to your plug, or possibly from the power distribution network to your panel. Good Luck.

Hi Patricia,

You may need a professional cleaning of all the switches internally. If you are up to it. Compressed air with an electronic aerosol cleaning solution is the first approach. Over time these parts develop oxidation. The voltage levels are small and the signal cannot be generated.You need to know what too clean, most are visible. You can also look for internal fuse protection. Make sure when the cover is removed to pull the power first. Some higher end Amplifiers provide protection. You will need a digital multi-meter or equivalent to test the fuses.

http://www.teac-audio.eu/downloads/2/2/8/1/9/TEAC_AG-790E_datasheet_EN.pdf

So before doing all of that. There is a reset switch. It is located between the speaker switches on the face of the receiver. At the top and in the middle left center of the display. Not at the speaker buttons on the left.

That function may be tripped. Reset it twice and try testing with different speakers if it fails again. It may trip instantaneously if there are abnormal voltage levels present in the circuit that arouse protection.

I have located and offer you the Manual PDF. Go here first and try the following. On page 8 in the manual. Titled, " Name of each Control" (D). There is a location diagram for you to observe. Please take some time and look this over.


http://www.teac.com/content/downloads/products/746/ag-790_6l_manual.pdf

Finally, if you need someone to talk too. The You Tube Video has an outlet store tied to it that offers live help.

TEAC AG 790A AM FM Stereo Receiver



Good troubleshooters always take a problem apart one step at time. So go for it. I know you can do it. Fare. Well.

http://www.commentcamarche.net/notices/teac-ag-790a-4760/

http://www.manualnguide.com/dl/17908/

Find the manual at:
http://www.teac.com/consumer_electronics/receivers_&_tuners/ag-790a/

and on page 6 they show how a Tape Deck is attached. Attach the EQ exactly like that and if you have a Tape Deck or two attach IT(them) to the EQ as if IT was the receiver.

To engage the EQ at the receiver choose Tape and everything passing through the receiver wil lbe routed OUT to the EQ and back IN via the PLAY connections.

There is a problem in the final stages of the amplifier section that the protection circuits are detecting. They then shutdown the unit to prevent further damage. The most likely candidates are the output transistors. This is a relatively simple repair for an audio shop. Expect a parts cost between $20-$45.

Dan

Always be that legend when the audio amplifier IC damaged

hit reset button back of receiver

The protect message indicates that a problem was detected in the last stage of the amplifier and that it has shutdown to prevent further damage. Usually this indicates that the output transistors have failed. Any shop that works on audio should be able to repair this. Expect a part cost in the $20-$40 range. Add in the local labor rate for the total repair cost.

Dan

Since the problem appeared to correct itself on occassion, I would first look for poor solder connections either at the output transistors or at the voltage regulators. Let me know if you need more detail.
Dan