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My amp,a Sanyo JA340,has fused a circuit board as far as i can tell.It overheated i think. This is an old friend and has served me well.Is it worth repairing?

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2 Answers

How do I locate and replace the internal amp fuse?


If you open the case you should be able to see the fuse pretty easily, they are the old glass tube type that are mounted on the power board. If you need a schematic you can look for the sams photofact website. That is the best one for those.

Sep 23, 2016 | Marantz SR5006

1 Answer

Hi ,i just bought a pioneer receiver model VSX-524 my problem that i am having is when i turn the unit on it shut off evry time within 5sec .it also tell me that overheated and the unit is dead cold.i've...


There is most liekly a cable that has come loose. Been seeing that alot lately on the 524's. If you want to try and check it yourself: Unplug it!!
Take the cover off.
Locate the amp board - it is the one attached to the large silver heatsink in the middle of the unit.
Look at the right side of the board (as you see it from the front)
See if there is a cable that is unplugged from the far right side of the amp board.

Hope this helps, otherwise take it back to where you got it from and have them fix or exchange it.

Feb 14, 2015 | Pioneer Audio & Video Receivers

1 Answer

I have a Sony AV model str-dh520. The protection circuit keeps coming on then shuts down. I tried unplugging all the speakers from the unit but still protection circuit is still activated and shuts down....


Hello there friend,
Go here at Sony for some ideas to try when PROTECT shows on your machine. https://us.en.kb.sony.com/app/answers/detail/a_id/39211/c/65,66/p/41901,43145,92877,44396/

It seems the main amplifier chip / circuit may be overheated or short circuited and is now permanently faulty and need replacing Generally means desoldering the chip and replacing.

Sep 08, 2014 | Audio & Video Receivers

1 Answer

It won't turn on


Um, since this unit doesn't actively drive a subwoofer by design, how would THAT be a factor in its demise? Or are you using it as an amp for the sub? Then we need to know more about the sub - like its model number and impedance.

And did its predecessor also serve the same purpose? If you're overheating amps routinely I think you need to get more powerful (or professional-grade) amps.

This is not a very powerful receiver at 90wpc so using it for sub duty may be asking too much of it if you drive it too hard.

If it won't turn on with NO speakers attached, well, may it rest in peace. What model was the old receiver?

Apr 09, 2010 | Yamaha RX-V661 Receiver

3 Answers

Problem with Technics SA-DX850


SA-DX750 (sister Model to SA-DX850). Showing error code F70, after a few minutes running. Checking the power rails revealed +5VA and +5VD, on the Digital Circuit Board 'A', dropping to about 2V, when fault occured. F5, T1A, on the Sub-Transformer Circuit 'M', was subject to occasional blowing. The problem was traced to an intermittent break, in the printed circuit board conductor, in the vicinity of Q1702 (+5VD regulator) collector, on the Digital Circuit Board 'A'.. Repairing this cured the problem. Note that removing F5 (above), or disconnecting CN702, CN1000A or CN904B, on the Digital Circuit board 'A', also causes this error code to be displayed. Failure of the audio output ICs, IC651 & IC801, is apparently the usual reason for this error code being dsiplayed, but it is worth checking the power rails viz. +/- 25V (Fuses F3 & F4, T6.3A, on Sub-Transformer Circuit 'M') +/- 55V, +/- 14V etc.

Aug 11, 2009 | Technics SA-DX850 Receiver

1 Answer

Unit won't power up completely


The clicks you hear are the relay that completes the circuit for 110V AC to the main power transformer. Mine had the same problem and here's how I've gotten it to work. A lightning strike near our house caused it to fail, and I traced it to the power transformer relay activation circuit. The tuner and amp were fine. I found a bad transistor in the relay circuit, but didn't have a replacement on hand, so I soldered a jumper wire across the relay switch connections on the power transformer circuit board. This connects the 110V AC directly to the power transformer. DC Power to the amp and tuner circuits will still be controlled by the power switch, but the transformer will be supplying all the AC voltages to the main board. If there is a real problem with the circuits that load the transformer or the transformer itself, then the fuse will blow. If the fuse doesn't blow then I suspect the problem is just in the power sequencing circuit itself, that is not needed for operation other than to make the unit "Energy Star Compliant". A lot of electronic items have a transformer that is not switched, and only fused, so that the supplies are available at all times.

Jan 24, 2008 | Audio & Video Receivers

2 Answers

Yamaha reciever will not power on


If the receiver is completely dead, the problem could be as simple as a blown fuse. If there is no visible fuse holder on the back panel, you'll need to remove the cover. There should be a circuit board near the rear of the chassis where the line cord attaches. You should see a small glass fuse held by clips on the circuit board. Visually inspect it for a break in the small wire inside. Alternately, check it with an ohm meter. If the fuse is blown, replace it with the same amperage fuse rated for 250 volts. (The amperage is engraved on one of the metal ends i.e 0.5A). Before replacing the fuse, do a visual inspection of the other components on the circuit board looking for any signs of burning or overheating The over voltage may have damaged other components, in which case you'll need to take it in for service or scrap it. Most Yamahas have a separate standby supply. If yours has this, chances are pretty good the damage is limited to this area. If the main supply is damaged, it may not be worth fixing.

Dec 12, 2007 | Yamaha HTR-5830 Receiver

1 Answer

No darn pre-amp outputs on the XR25 model......arrrrg!


Different circuit boards are involved here, and what you propose would be cost-prohibitive in that you would have to come up with a 45 board, or rework the old board(very tedious!). Take the plunge and stay the course on factory built items in this case...accordianman

Aug 05, 2007 | Panasonic SA-XR25 Receiver

1 Answer

Marantz SR5000 Protect mode


The Marantz SR5000 and others of it's make, design type, and year group are prone to this problem. Many such units can be reset by pressing a sequence of three buttons with sporadic results... the SR5000; however, does not provide any such option. If the "Auto protect" mode comes "on" then you know it's not a simple power supply "fuse" problem that can be fixed for a dollar by opening the case and replacing the glass fuse with one of the same rating value that is stenciled on to the power supply circuit board. (Easier than trying to read the old fuse.) If you can get the schematics and know a bit about replacing electronics parts using a low-power soldering iron, then you might want to take a shot at fixing it; otherwise, it's time for recycling. (Tip: Look for discolouration on a part on a circuit board first, this indicates overheating and a possible short. Then trace the schematic circuit for the "Auto Protect" circuit to diagnose which integrated circuits is at fault.) Typically, it costs more to fix it in a commercial shop than it's worth as someone has to pay the cost of benchtime diagnostics... the repair part is fast once the faulty parts are discovered. There are free sources on-line of the service guide for this receiver; however, downloading the plethora of rar files to assemble a complete manual is a challenge.

May 13, 2007 | Marantz SR-5000

3 Answers

Amp powers off after switching on


The DSP-A1 has an internal self diagnostic program which you can access from the front panel. The service manual shows how to do it and what the readout codes mean as far as the fault that caused the trip. Service manuals are cheap and readily available on the web.

Mar 15, 2007 | Yamaha DSP-A1 Receiver

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