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I accidentally connected jumper cable backward when jumping my car, now the amplifier won't turn on. I think the fuse near the battery is OK because it seems to send power to my capacitor. What do you think?

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Check the fuse on the amp.

Posted on Aug 20, 2008

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2 Answers

I have a Sansui 2000A Stereo Tuner Amplifies that powers up but has no sound. the fuse for the 220-250V 2A was blown and replaced. The speaker fuses look good. Should I replace them too or is there...


If the fuse was blown on the 220-250 V side, I am assuming that you are in the UK, if you aren't , but are in the US, change the power setting dial/switch on the back to 100-120v and you might be good to go. Also, I know this may sound silly, but make sure that the speaker selector switch is pressed in or set to a speaker set ( A or B). Love the Sansui gear, have many complete systems myself!

Oct 17, 2013 | Sansui Classic Vintage 2000a Stereo...

1 Answer

What happen to the car when you hook the cables up backwards on a battery to jump start it


One, or possibly both, batteries have the very real chance of exploding.
murf427

Aug 01, 2012 | Metra 99-3413 geo/toyota prism/corolla...

1 Answer

How do I connect Marantz AV7005 to Marantz SR9600


Remove the little black jumpers on the 9600 that link the pre amp section to the main amplifier inputs. They are the top row of rca inputs on the back. Using single rca cables from the pre out of the 7005 into the main amplifier of the 9600 connect all the channels you have wired speakers for, L,R,C, SL,SR, etc up to 7. Connect all your sources to the 7005 with whatever cables you have it doesn't matter. Turn off the 9600 volume and use only the 7005 to control the volume. It works perfectly giving an awesome amp a new lease on life. Good luck!

Oct 17, 2011 | Marantz Audio & Video Receivers

1 Answer

Set dead


Hi,you can use the following instructions below to troubleshoot the receiver set that is dead.

Instructions



Turn the receiver off and disconnect the power cable from the wall and the back of your receiver.

Test the cable with a multimeter to verify that it is working properly and supplying the receiver with full power. Multimeters are widely available through electronics supply shops, hardware stores and various online retailers. Different multimeters give different readings, so check your operations manual if you are unsure how to test a power cable for continuity. Replace the power cable with a working one of the same type if the original cable is not working properly.

Connect the multimeter to the pins where the power cable connects to the amplifier if the cable is working properly. This is the same area from which you disconnected the power cable in the first step. This is a particular process and all multimeters use different readings to test for pin-out continuity.

Check the fuses on the back of the amplifier if the multimeter shows a correct reading when you test the power cable and power connection on the back of your amplifier. Look carefully for a cracked filament within the glass tube; even a small crack can result in power failure or intermittent operation. A blown fuse will generally look gray or black around the edges or inside the glass tube. Blown fuses will not provide power to the amplifier and are a common cause of no power or a single dead channel, depending on the location and type of fuse.


Tips & Warnings

Opening the amplifier is not recommended, as there is a risk of electrical shock and you may void the manufacturer's warranty from Yamaha or any warranty provided by the retailer you purchased the amplifier from.

Always replace fuses with the same voltage fuse. Using the wrong type of fuse can damage your amplifier.

Do not try to open the receiver and fix the power supply if you believe that you have a power supply problem. This is generally quite dangerous if you do not know exactly what you are doing or are not working with the proper tools.

Hope it helped..

Feb 18, 2011 | Audio & Video Receivers

1 Answer

My rx-v367 does not power on, i think the protective circuitry has been activated. How do I reset it?


hi,

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong. Is there is any standby light. If not check the AC fuse.
Normally AV receivers show this when any of the output amplifier get some problem. there are five amplifiers in this AV 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.

First of all remove all speaker connections from the amplifier and powerup the amplifier. If the amplifier turns ON then, then any of the speaker have some problem.
If not 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 to 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 . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
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

Feb 17, 2011 | Yamaha RXV367 Receiver

3 Answers

Denon dra-95vr receiver has no sound out. All


Two things to check. First, the 95VR can be deceiving because it has a "variable loudness" control that some may mistake for volume. The actual volume is controlled by the big up and down arrows on the upper right side. If the volume is turned up, you should see the volume bar graph display show up. If none of the inputs are giving you volume, and the volume is turned up, then try running the output from the processor loop output in the back to another amplifier. The processor out is jumpered to the processor in for normal operation. Missing jumpers could cause a problem also. If there is sound coming to the processor out, then you have a problem with the power amplifiers. Best to refer that to a technician.

Dec 29, 2009 | Denon Audio & Video Receivers

1 Answer

Power will not stay on


Activated protection circuitry means that the amplifier is seeing conditions it does not like and is shutting down the power to prevent further damage.
Either you have a short in your speaker wires, in your speakers, or a blown amplifier.
Disconnect both speakers and turn on the amplifier. Does it still give the error message? If it does, your amp is blown. If it does not, carefully inspect your speaker wires and their connection. Make sure all looks good and reconnect the speakers and try it again. Still get the error message? You likely have a problem in your speaker cabinet(s).

Apr 21, 2009 | Onkyo HTR500 Receiver

1 Answer

Ccr1cd keeps turning off my yamaha receiver rx-v480 keeps turning off when i turn it on


check your speakers cables, connections. check for possible cable short. If seem ok, remove all speakers, turn the unit on and see if still turning off. if it does then you have a trouble in your power amplifier, defective output sectiuon. could be your power and driver transistors. possible dirty or corroded system control board. try cleaning.

Dec 24, 2008 | Yamaha RX-V463 Receiver

5 Answers

Harmon kardon avr 25 ii


I upgraded my HK AVR 20II and ran into the same problem when I tried to hook the old unit up out in my garage.

Luckily I remember that on the rear there is a pre-out RCA port (L/R) and a Main-In port that are intended to be to/from an equalizer/amplifier. These come jumpered out of the box, but I had been using an equalizer so the jumpers were long lost.

Assuming you also have no amp/eq you are using, just connect the Pre-Out to the Main-In using a standard M/M RCA cable and you will be in business. (turn the volume down first!)

Good luck.

Jan 02, 2008 | Harman Kardon AVR 25 MKII

1 Answer

RXV1200 A/V receiver


please check your speaker cabling first for possible short connections. if all ok, then remove the speakers (all) and try to turn on the unit. If still doing the same thing then you have busted one of your amplifier. it can be any of the amplifiers (main center surround etc...

Aug 18, 2007 | Yamaha RX-V1200 Receiver

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