Question about Jamo SUB300BA SUB 300 Powered Subwoofer Subwoofer

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Please help! Jamo SUB 300 subwoofer still blows (0.8A) fuses after replacing a faulty thermistor, despite a high ohms reading directly across AC mains terminals on the board. What is causing the fuse to blow as if a dead short is present? I don't know where to find a schematic cct diagram for it.

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Hi,
i have a jamo 250 sub.the blue light is working.when i connect the jack to the left line IN according to the manual it makes a sound as well.but seems not working.is it related to the fuse????i know the fuse box.but i dont know how to remove the fuse to check.pls help me out.my receiver is onkyo tx-sr 608

thank you

ron

Posted on Aug 20, 2011

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Jamo sub 250


Internal power? Check fuses. No fuses? Disassemble and check Power supply if it is internal. If it is external, check power supply with meter.;.

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F25 error code


Having an error code on your appliance can be an inconvenience and I know how important it is to have a good working dryer.

The "F25" indicates the INLET THERMISTOR is shorted or the INLET THERMISTOR circuit is shorted. If you replaced the inlet thermistor and control board then it may have bad inlet thermistor circuit. You should disconnect the thermistor circuit connections at the thermistor and control board and test the thermistor circuit for continuity. Check the circuit to see it happens to be open or shorted with an ohm meter.

The inlet thermistor is located on the side of the heating element housing is a thermistor and high limit combination. The part number is 8557403. The inlet thermistor portion of the thermistor/high limit will have two solid red wires connected to it. It could have faulty new thermistor or it could have an open or shorted thermistor circuit or a faulty control board. The thermistor can be checked with and ohm meter. Disconnect the two red wires and place the ohm meter leads across the two terminals. At room temperature it should measure approximately 50k ohms of resistance. If it measures 50 k, then it should be reconnected and then the sensor circuit disconnected from the control board and retested at the harness wires to see if you get the same measurement reading. If it does measure the same, and it continues to display F25, it could have a faulty control board.

What is your model number?

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The fuse of Jamo Sub-200 gets blown off. is there anyone who might know the reason. thanks


try replace the blown fuse with ampere and check the sound if still ok.
some fuse got blown if the load current exceed. maybe high volume can cause the high current.
other cause by short circuit coming from the amplifier.

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I was given a Jamo sub 1810, but have no instruction manual. I'm trying to hook up to my Pioneer HTP-2500 home theater system. What would be the correct way? Also if you could help me with the setup,...


Find it here...

http://www.jamo.com/na-en/support/owners-manuals/

http://www.jamo.com/images/download/779.aspx


The Jamo is self-amplified and accepts Line Level input ONLY.

The HTP-2500 receiver drives a subwoofer directly with SPEAKER LEVEL output only and does not have a volume-controlled output for driving externally-amplified devices.

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If the subwoofer has its own power cord seperate from the rest of the audio system, the internal amplifier could be fried or u have a loose connection inside the box

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Jamo Sub with no power


THE IS A FUSE INSIDE THE UNIT,YOU MAY WANT TO CHECK THAT.IF IT BLOWS AGAIN WHEN TURNED ON YOU HAVE SHORTED MOSFETS. THEY ARE LIKE TRANSISTORS.

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Jamo Sub300. No power. No lights


Well it would void the warrantee, but you can take the back panel off and the power supply will only have two leads (3 if grounded) in from the plug, and out to the crossover. It sounds as if you are correct that the power supply is bad.

Charles

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3 Answers

Blows fuse


If you disconnect the degaussing coil and the set plays fine, it means one of 2 things is wrong. The degaussing thermistor could be shorted internally. I have seen this happen a few times on those degaussing thermistors that are in the little black boxes with 3 legs. Those boxes actually have 2 thermistors in them, one to do the actual degaussing and another connected directly across the AC to act as a heater for the degaussing thermistor. One of those thermistors could have "flashed over", which would blow the fuse the instant the set it turned on. The only other thing would be the wrong size main fuse. Without a degaussing coil the set probably draws about one amp, but the surge at turn-on with a degaussing coil could be as high as 4 amps. If you have the correct fuse installed and it blows at turn-on, replace the degaussing thermistor.

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