Question about JVC RX-318 Receiver

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JVC RX-318 keeps blowing fuses

I replaced a blown fuse and everytime I replace the fuse and turn the unit back on, the fuse blows instantly.
What is wrong??

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Could be several things, speaker wires touching,shorted output transistors, a shorted rectifier diode,bad filter caps in the power supply,those are the most common

Posted on Jan 06, 2009

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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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The compressor has locked up and will not start...this is terminal and will cost more to replace it then the unit is worth...
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BLOWING FUSES INSIDE UNIT. REPLACE FUSE. BLOWS INSTANTLY


hello because theres a dead short and the fuse is doing it's job could be number of thing that are wrong. 1 shorted diodes/ 2 shorted output transistor/ 3 shorted resistors /4 blown or swelled capacitors get an engineer to check it out good luck

regards
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JVC RX 505v stereo receiver keeps blowing fuses. Replaced fuse with specified rating (125v 5 Amp) but still keeps blowing fuse. Fuse appears black inside and I see a flash when I apply power. Can...


The likely cause of this is a dead short in the power supply. I don't receal the specifics of this unit, but there should be a set of four(4) diodes or a single bridge rectifier in the main power supply area. Check this/these for a direct short using a diode checker. Other than that, the output transistors being shorted can cause hte same symptom. Without seeing the actual unit, I can not tell for sure. If you know how, check the output transistors as well. Report your results here.

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More likely to be either shorted out bridge rectifier or MOSFET in the primary circuits of the power supply. You need to Ohm out those parts.
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Turn it on and blows fuse replace fuse and plug it in and it blow


You need to have the receiver serviced. The fuse is blowing because some part in the power supply or amplifier section has failed. A service technician will need to troubleshoot the unit to determine what parts need to be replaced.

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