Question about Yamaha RX-V650 Receiver

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Cannot Power Up, Sometimes can

My amp cannot power-up I have made following check on unit.
1. Output Power Mosfets (OK)
2. Main Transformer & Fuses (OK)
3. Speaker Selection Switch Setting & Switch (OK)
4. Speaker connection (OK)

Sometimes it powers up, When switch of and on again it doesn't power-up.

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  • 22 Answers

I had a real nice yamaha natural sound receiver and the relay that switched it on went bad a lot..... try the relay???

Posted on Apr 26, 2010

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Posted on Jan 02, 2017

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I accidentally plugged a speaker output into bridge and right output at the same time. All fuses are good. Did I smoke the transformer? If so where can I get one?


Probably not. The fuses would have blown if the transformer had been overloaded.

These amps do not have output transformers. The transformer you see inside are likely switching transformers to increase the supply voltage substantially. They are pretty rugged. There likely fuses on the circuit board that you don't recognize. If there are surface mount components on the board, look for white rectangular that are square when looking from the end. Usually they will have xxA marked on them, a 1 or 2 digit number followed by an A. There are other shaped fuses, but they should all have a similar marking. Usually, the left and right amplifiers will each have TWO fuses associated with thir power supply and sometimes an additional one for the speaker.

Feb 01, 2015 | Car Audio & Video

Tip

ERROR CODES AND DESCRIPTION



write_tip-o4moz2b1db1pt3wjiroxq3xy-1-0_0.jpg

2X Blink - Main Power Error
A 2X protection mode blink pattern can be activated due one of the
following defects.? Loss of REG12V (LVP)*
? Loss of -125V (Single Line)
? Excessive -125V Level (OVP)*
? Loss of Power-ON Signal
? Excessive PFC Voltage (OVP)
? Excessive PFC Temperature (OTP)*Low Voltage Protection (LVP)
*Over Voltage Protection (OVP)

For more check the following link. Use the search tab on the top right corner to find your product
www.electro-medical.blogspot.com

google.com/+AjinGopakumar

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1 Answer

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follow this instructions and fix it. God bless you
Instructions
    • 1
      Plug one end of a shielded input cable into the mixer's main output, and the other end into the crossover's input. The cable connectors will be dictated by your particular mixer and crossover, and will be either standard 1/4" or 3-pin XLR connectors. Consult the owner's manual of all components for specific details and recommendations.

    • 2
      Plug another shielded input cable into the crossover "high" frequency output, and the other into the crossover's "low" frequency output.

    • 3
      Plug the cable coming from the crossover "high" output into the channel one input on the stereo power amp, and the cable from the crossover "low" output into the channel two input of the power amplifier.

    • 4
      Plug one end of the unshielded speaker cable into the power amp channel one speaker output, and the other end into the horn tweeter.

    • 5
      Plug one end of the second unshielded speaker cable into the power amp channel two speaker output, and the other end into the woofer. The connections are now complete.



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Well it seems to me that the pictures of this amp show green ATC fuses which would be 30 amp fuses. What is your inline fuse from the battery? 40 amp fuses for the amp is too much current for the amps powersupply. If there was a short in the powersupply the max ammount of current that it could draw would be larger than designed to handle therefore damaging the amp.

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I have a cambridge audio A300 V2.0 amplifier that wont power up. i've checked for power at the switch and there is power and i've checked on the main board at the fuses but there is no power there, the...


Hi there get a multimeter place across mains input on transformer,FIRSTLY DISCONNECT AMP FROM MAINS,set your meter to contiuity ,if good you should get a low ohms reading (resistance),then check the secondaries (output of transformer) either 3 wires or four going into amp board..if readings acroos all wires are low ohms then transformer is good if one is open ,transformer has had it ...hope this helps

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The problem is not the transformer. You now have shorted output transistors at the very least. By corssing the wires you presented a zero(0) ohm impedence load to the output section. It quickly went into overload. Before the fuses had a chance to open up, the outputs fried. This unit will require new output transistors and perhaps the previous driver circuit will require parts as well. Figure on $20-$50 in parts plus hte local labor rate for the repair.

Dan

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Your power transformer should not be getting hot. The signal is not passing to or through the output transformer.Check the speaker connections on the speaker side of the output transformer. Go to geofex.com and check the tube amp debug page.

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Check fuses mounted near transformer . If blown check output transistor. Also check transistor transistors on small heat sink . they will cause fuse to blow.

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as your reg. output is 40v & you have checked every possible things responsible for it. my suggetion is that first you isolate power supply from hor.section & see if power supply output is ok. if it is ok then check for short & leakage in h/output like 1 hor.output tr. 2 diode or cap in eht winding. 3 check for print near eht transformer. 4 disconnect yoke connector & check . 5 & finally eht or flyback transformer.

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Make shure with an ohm meter that the primary and secondary windings have very little resistance on the main trasformer,then check voltage in trasformer and out from transformer...BIGRED

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