Question about Pioneer VSX-818V-K Receiver

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TECHNICS SA-DX850 F70

IT WORKS; BUT AFTER SOME TIME STOPS AND SHOW F70 ON DISPLAY. fuses are all good! otherwise it would not wor at all!!!

Enyone.

Or maybe someone knovs the voltages on emiters of tranzistors Q701 and Q708 (aprox +/-15V) i have +13,5 and - 16 and not stabile and i belive that may be a problem

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  • Miladinka Dec 22, 2008

    It happens even without speekers, same

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  • 86 Answers

It could be an overload from two speaker wires crossing, check the owners manual for error codes.

Posted on Dec 22, 2008

  • 3 more comments 
  • Sudo Bash Dec 23, 2008

    It could still be a short (overload) even if it is not the speakers that is just the most common cause of overloads. thanks for the bad rating on a free post though... I really appreciate it, but seriously check your system for shorts.

  • Sudo Bash Dec 23, 2008

    Actually it could be a capacitor problem, open it up and look for ones that are bloated or look like they are ready to explode it might even be one with the top protruding slightly. A volt meter will allow you to test them and see if they supply a constant and stable amount of volts and amps.

  • Sudo Bash Dec 23, 2008

    +13 and -16 should be fine... it fluctuates but to much fluctuations can mean bad components like capacitors...

  • Sudo Bash Dec 26, 2008

    I should rate your post as inappropriate for screaming and being a general @$$...

  • Sudo Bash Dec 26, 2008

    Please also learn how to spell.

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2 Answers

Its showing F70 error on display. Only workd on DVD mode, when i turn it on any other mode it just shows F70, switch power off. All fuses are ok, no any visibly damaged components


The fuse is a part of the problem it is for safety measures
the problem is in between the power supply regulators, capacitors and power amplifier circuit board.
usually a regulator or an output transistor can cause this error.
hope this helps.


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I have a Technics SA - DX750 Amp Everytime I turn it on I get an error message F70 and then it requests that I turn the power off. This is all it does now, so sound. How do I solve this issue I have...


Hi!

The F70 error certainly indicates a blown fuse inside.
The real problem is why the fuse is blown: there are only two possible reasons
1. there is a short circuit on the output (lines or speakers)
2. you have a blown output transistor (and that means some work and skills to replace).


To be sure, please change the fuse with a same rated fuse (buy more than one because it can blow again). Disconnect the speakers and turn the amp on. If the fuse blows again, it is sure something wrong with the output transistors. If the fuse remains ok, then please check all the wiring to the speakers.

Hope it helped.

Regards,

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