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Posted on Jan 02, 2017
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.
Posted on Apr 05, 2010
The phantom power is used for condenser mics. MAKE SURE you do not plug in other mics or devices that do NOT have balanced, isolated outputs as they will short out the phantom power to others.
You should find between 15 and 48 volts between BOTH pins 2 and 3 of each mic connector when measured to pin 1 of the connector. There is about 6K ohms impedance from the phantom supply to pins 2 and 3.
IF you have an accident and connected high voltage to pin 2 or 3 it COULD back up and blow the bypass cap for the 48 volts.
Please note: ALWAYS power ANY interconnected equipment from teh SAME receptacle to avoid damage due to ground bounce in the event of a fault in a piece of equipment.
Posted on Oct 23, 2010
You will plug an UNBALANCED 1/4 inplug cable into the MONI jack on the front of the unit. The other end will probably need to be an XLR plug to connect to the Kustom POWERED monitor. Please note that the UNBALANCED output of the Phonic is NOT good engineering practice. The Phonic stuff is normally low-end and they don't do everything correctely, although for a small system it should work. IF you get excessive hum from using a long cable to the Kustom with a "Kludged" unbalanced to balanced cable, you MAY need to use a DI box at the Phonic end to convert the unbalanced Phonic MONI output to a balanced line (XLR to XLR) for a longer run to the Kustom monitor. You might get a 1/4 inch TS to XLR balanced plug that has a transformer in it and use an XLR to XLR cable to the Kustom. Please note that having this plug in the Phonic hangs out and is easily bent over so I would recommend using a right angle connector at the Phonic and plug the 1/4 inch TS to XLR adaoter into that so the yanking of the XLR cable won't break the 1/4 inch adapter off in the Phonic.
Posted on Feb 24, 2011
SOURCE: How do i hook a
You CAN drive the power amps from the main amp inout jacks BUT the rest of the inout of the 8600 would be dead then. You can connect the L and R from the FX24 to either the media RCA jacks or into the channel9/10 jacks. FOr the latter, use TRS cables. Leave the two selection buttons in the up position.
Posted on Sep 22, 2011
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