Question about Fender Passport Deluxe 500watt Sound System with Deluxe Speaker Array

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Protection light came on then went of now i get nothing when i flip the switch to on.

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Likely an overload failure caused the protect light to come on, and then the fuse blew so all power is off... Do NOT replace the fuse as you will LIKELY do additional damage to components. Take unit in for repair immediately.
Note: These units are really hard to work on due to the way they are packaged.

Posted on Nov 24, 2010

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Are all the tubes lighting up? they should glow like dim light bulbs. If not, replace them with the same model type (12ax7, or EL34 for example).

Often there are two fuses, one to protect the speaker and another to protect everything, it sounds like the latter fuse may be burned out. take it out and take it to radio Shack for exact replacement.

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The most likely case is that one of the main output transistors (if which there are many) is shorted. When the protect circuit senses DC on the final output, it will not allow the output relay to come on to protect the speakers from raw DC. With the power removed, you can check between each outputs Emitter and Collector and you will probably find close to zero ohms. From that point you need to unsolder each of the pins of the bad channel until you find the shorted device(s) and replace them.

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Make sure the plug for the power cord is the same polarity and DC or AC for the mixer. Also make sure the inner diameter is correct for the station power jack as well.

As long as power from the supply is correct and adequate, theother potential sources of problems can be a blown internal fuse, broken power jack circuit tracks/traces, bad solder joints, dirty switch contacts, some contact cleaner sprayed in the gap of the switch toggle and then flipped rapidly for a number of times might clean it up.

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Behringer Xenyx 2222fx doesn't power up. I've replaced the fuse and power cord, still nothing. When you flip the phantom power switch, the red +48V indicator light comes on on the front. Other than that,...


The Phantom power comes from a seperate winding on the switching power supply.Likely one or more of the other voltages are not present due to a failure of one or more components. The supplies are current limited so a short anyplace on the board may cause the problem. I had one of these short betwen the +/- 15 volt busses because somebody spilled liquid into it.

Here is a close schematic... a slightly different model with less channels, but circuoitry is the same, just more copies of it in yours: I believe it is zipped with four files... the last is the power supply.

http://elektrotanya.com/behringer_xenyx-1222fx_v1000_dpm5m_ub-spsu2_sch.zip/download.html

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1 Answer

Behringer XENYX 1622FX, won't power on. Phantom power works(?)


After reviewing the schematic, I don't understand how the Phantom power can REMAIN on with the power switch off... this CANNOT occur except for what energy is left in the 48 volt supply filter cap... This might last for minutes after the fuse went... UNLESS you have devices connected which are backfeeding the 48 volts. (which would be a disaster)

The 48 volts, +/- 12 volts and +/- 15 volts and the +5 volts ALL come from the SAME switching power supply. I suspect one of the filter caps went or the primary switching regulator a TDP245Y chip.

You should ONLY work on the line side of this using an ISOLATION transformer since the line side has lethal voltages.

To do testing, one replaces the fuse and puts a 60 Watt light bulb in series with the hot side of the inout line. The lamp "acts" as a resetable fuse and limits the current for testing. When all is well again, the lamp will remain out with the power flowing through it.

The D1 diode bridge and C7 input rectifier and filter are first things to check. You can do those with an ohmmeter.

I will caution you to ALWAYS power any and all equipment from the SAME power source. Plugging in devices from across the room will set up ground loops and any ground fault will fry equipment.

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MY Fender Passport P250 went into protect mode. I changed the FUSE at the power supply with a new fuse. Still it is in Protect mode. How to fix this


This needs to go to the repair shop. The protect mode is turned on when either the power supply has a problem or one or both power amplifiers have a problem. These are often blown components.

These units are HARD to work on. To open you have to first remove then front panel before you can remove the back panel that has the power supply and power amps/heat sinks.

Compare repairs of these units to working under an automobile dashboard!

Hint: On startup, use a series 150 wat lamp to limit current while repairing. SInce these use a switching supply operating off the input line, use an isolation transformer for personal safety.

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1 Answer

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If you get absolutely no sound, not even a pop when changing the standby switch, this probably means the rectifier OR the switch has failed. The red light just means power is getting to the power transformer... probably fuse is OK.

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