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I have a short between the inner copper core and the outer braid on the lead from the aerial amplifier is this a normal condition prior to supplying the amp with a voltage

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There should be no short between the conductor (core) and the shield (braid), especially if it is used to supply voltage. Please be careful.

Posted on Oct 09, 2008

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I have a sansui 14" tv.14 yrs old.there is showing 220volt supply at antenna & audio video receiver point.what's the fault.how I will rectify it.thanks


The antenna & Audio Video receiver point should not have mains power getting to it. Especially the antenna which is the aerial. If the aerial has 220 volts on it you would get a lethal electric shock every time you plugged in the aerial lead!
There is clearly something wrong with the units power supply if 220 volts is getting to that part of the unit.

Aug 31, 2016 | Sansui Audio & Video Receivers

2 Answers

PROTECT does not come out from the screen


Check the speaker wires for shorts or damage. If none, the amplifier has faulted and will likely require service to restore back to normal working condition.

Apr 11, 2014 | Audio & Video Receivers

1 Answer

When on FM tuner, stereo stops playing after a few minutes


Right then sounds like the connection from the aerial lead into the receiver - check out the socket where the aerial plugs into!

Is it loose at all or could there be a bad connection inside the unit.
Get the cover OFF and investigate yourself before you rush down to that very friendly repair man along the street.

Jan 05, 2014 | Denon DRA-365R Receiver

1 Answer

Where is the aerial input located on this item


Look for 2 small shiny metal screws on back, fm aerial is usually a T wire with couple forks which go under the shiny metal screws.

Nov 16, 2013 | Panasonic Technics Sa Gx100 Amplifier...

1 Answer

Standby light is flashing on my marantz sr7001


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the Standby blinking (protect) show or not . if not, then any of the speaker is damaged also check the wire for any short circuit . If then also its goes to protection then it have some hardware truouble inside.

Amplifiers gose protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally amplifiers show this when any of the output amplifier have some problem. there 6 amplifiers in this receiver . May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. Connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). Then connect the positive terminal to all the output transistors emitter pin one by one . The voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than +/- 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
After replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. Put the bulb in a holder. Now you have two wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim ,then remove the power , remove the bulb insert fuse and connect the power and check.
(If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components

OK

Aug 20, 2011 | Marantz SR7001

1 Answer

"protect" error


You more than likely have a problem with your power supply. Home theater receivers have many different watchdog or protection circuits. If the power supply is not output the correct voltage or is shorted that will trigger a fault. You could also have an overload condition on the output stage. Too much current drawn by the amplifier will trigger a fault.

Feb 06, 2010 | Sony Audio & Video Receivers

1 Answer

I keep loosing digital signal with both my digital tv's, I have a digital aerial fitted 18 months ago. what is the problem?


This can be due to a few problems.Firstly make sure your aerial is pointing in the right direction as beam aerials attenuate(disregard) signals which are not pointing directly at the aerial.
make sure you are using good quality 75ohm cable i.e rg6 and connections are good and not shorting out.
The length of run of the cable will also affect the signal as will any splitters or joins in the cable.
If you know the signal is good in your area then it will be down to the aerial,cable terminations ,aerial position or a combination of these.
If the signal is poor you can either...Buy a high db gain arial which will amplify the signal and or a masthead preamp which will again boost the signal.
please note that if your aerial is not pointing in the correct direction then any boosting of a bad signal i.e ghosting...will only make it worse.
try starting from aerial direction then connections then a high gain aerial and or booster.

Oct 14, 2009 | Audio & Video Receivers

1 Answer

When I turn on my receiver, it automatically turns off and the power button flashes red. Prior to shut down, the receiver display notes "Tuner Ext. In" What's the problem? It has worked p


Protection circuit turns off the unit because of critical conditions- wrong power supply voltages or one of the power amplifier channels is bad. First, visual inspect the power amp board near the heat sink for burned resistors, test outputs for a short. If there are no problem you may try to turn the unit on and you have several second before it shuts down to check power supply voltages and power amp output voltages and bias, then ... Long story you'd better take it to a repair shop or repair at ebcelectronics.com

May 09, 2009 | Denon AVR 2808Ci Receiver

1 Answer

How to remove and replace damaged power relays


The relay is soldered onto the circuit board. Unsolder the connections using solder wick. Solder wick is a fine copper braid that soaks up solder as it melts, leaving the connection clean so you can remove the old part. You also need an appropriate soldering iron and solder for electronic work. Rosin-core solder, small diameter, and a 40-watt iron are sufficient.

Once you have the correct replacement part, remove the old one and solder the new one to the circuit board in its place.

Apr 26, 2009 | Sony STR-DE675 Receiver

4 Answers

Amplifier displays "Speakers are overloaded" and switches off


Either the amplifier protection circuit is kicking in due to a fault, or your speaker wires are shorting. Could also be a fault in a speaker - shorted turns due to overdriving. Check amp with speaker leads disconnected, and if OK, see above.

Dec 10, 2007 | Panasonic SA-XR55 Receiver

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