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Technics SU-Z22 fails to turn on. There is mains supply to the tx There is no visible power supply fuse or fuse resistor

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  • unclejames50 Nov 02, 2008

    We have checked as advised and without speakers connected. we find there is no voltage to the main board from the tx.
    There are no visible fuses.
    We request that you supply us a circuit diagram showing voltages etc.
    We will then have a clear picture which should enable us
    to trace the fault

    Thankyou

  • unclejames50 Nov 02, 2008

    It looks as though we now have the necessary information to effect repair. We should be right now thankyou.

    However, if not, we will get back with it

    Thankyou for your fast and proficient service.

    Congratulations on a excellent product

×

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  • Pritish Singh Nov 02, 2008

    happy to help you at any time!

  • andrew clarke Sep 25, 2011

    hi im having the same problem wi my su-z22 but as im not technical so the plans dont mean anything to me can u help

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Check outlet and test cable and voltage transformer also check if there any short circuit

plz do rate this post if u can

Posted on Nov 02, 2008

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1 Answer

How do I fix my onkyo tx-sr307


  • Check Fuses
  • Check for failed capacitor or resistor.
  • Check for open solder connection
The thermal cycling of these receivers can result in a failure of the solder joints around the components that get hot. The large capacitors if failing usually show signs of bulging or electrolyte leaking.

When the unit boots up out of standby the unit does a self check to confirm all power supplies are within determined limits. components such as resistors operate near failure limits. These parts are designed to fail similar to a fuse if the circuit is over loaded/heated.

Common problem is the required ventilation is restricted by covering the top etc preventing required air flow, overheats and a safety resistor fails.

Replace resistor with same type to retain saftey features.
Look for a burnt resistor. They are usually raised off of the PC board.

Hope this helps?
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Sep 25, 2016 | Onkyo TX-SR307 A/V Receiver

2 Answers

Denon 1312 makes clicking sound will not turn on


If the front display does not light up at all when the press the power button, it is usually either the main power fuse or the power transformer. If the fuse is blowing, that usually means a short in the amp section.

Dec 26, 2012 | Denon Avr-1312 Home Theater Av A/v...

1 Answer

No sound or "green" light


Hi,
Your power supply have a problem. Check the FF:
1. Power cord - might be open due to frequent bending and pulling.
2. Power switch - for open contact.
3. Internal Fuse might be open. If open replaced with exact ratings. If the new fuse blew again this is an indication of shorts in transformer, Rectifier Diode, Main filter capacitor, output IC.
#3 is technical and you must have knowledge in electronics, have tools and test instrument to perform the steps.
Hope it may help you.
Give a thumbs up if you find it useful.
Have a nice day!

Feb 07, 2011 | Philips Audio & Video Receivers

1 Answer

Onkyo tx-ds787 6.1 channel receiver won't turn on? no light nothing!


Check the fuse inside the unit. If there is no power lights, the power supply may be bad - the fuse is located in the power supply. Check you wall outlet, too.

Dec 04, 2010 | Onkyo TX-DS787 Receiver

3 Answers

My technics su-a900 mk2 keeps blowing the internal fuse


Sorry but it sounds like a problem with the power supply unit.
Look for any 'burnt looking' resistors on the printed circuit board and that should give you a major clue!!

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1 Answer

Power up problem


try powering the unit right down by disconnecting from the mains supply. fire up after 5 mins and see what happens. There is a separate transfomer for the standby supply(small red light) An internal fuse may have failed or the thermal fuse inside the transformer. If fuses blow as sson as you fire up = output transistors hay be short circuit.

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Onkyo tx-ds676 dead no power up


power down the amp totally to reset processor, then try again. If still no go, may have blown internal fuses- replace and try again
.... or failed thermal fuse in mains transformer. this is a workshop repair as it involves mains voltage that can kill :)

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1 Answer

Onkio TX-SR500 don't leave stand-by


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1 Answer

Onkyo TX-DS595 with no display?


Ran my 595 blind for 2 years and finally spent the time to diagnose it this year. Turns out that one of the resistors that is on the power supply went bad. Similar problems have happened with later models so i thought the same may be true for the DS595.

My Receiver has always run fine.. just no display anymore.

Here's the fix. Replace R9501. its on the larger board that is part of the Power Supply. You will have to take the 4 large screws out of the base of the big heavy power supply block to find the resistor. I believe the old resistors is a 1/4 Watt. I replaced it with a 1 Watt so that it can handle the heat of being turned on and off better.

The resistor you will need to buy is 2.0 Ohm. I wouldn't go anything less than a 1/2 Watt and preferably 1 Watt.

My receiver works line new now!


Nov 15, 2007 | Onkyo TX-DS595 Receiver

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