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Q-tech QM1066 power chair operating manual - Music

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2 Answers

Does this amplifier have a fuse?


Fuses check good. Transistors omn bad.

Oct 01, 2014 | Music

1 Answer

Behringer XENYX 1620FX, won't power on. Phantom power works(?)


Here is a schematic close to your unit:

http://elektrotanya.com/behringer_xenyx_1622fx.pdf/download.html

Scroll down to "get manual" and click to download. Ignore other download links.

The phantom power is a separate rectifier and regulator. See page 11 of the download service manual for the power supply. Be careful when working on line operated switching supplies. I suspect you will find one of the other supplies is dead. If the phantom is OK, then the switcher is working and one of the rectifier/filter/regulators is bad. Check if an electrolytic cap is shorted.

Jul 21, 2011 | Behringer Xenyx 1002fx Mixer 10 Input 2...

1 Answer

I have powered mackie sub woofer. There is a beating noise coming out like a heartbeat when we power it on but we have nothing plugged into the input.


Some sort of feedback. Try grounding the input or connecting a source that is silent. If it still does it, time for the repair shop. This may be close to the schematic:

http://elektrotanya.com/mackie_swa1801_sch.rar/download.html

Scroll down to the link "Get Manual" and click to download a compressed file with two parts. One is the electronic crossover, the other is the power amp.

There is a mute control if signal is not present and also a gain limiter. This may take some troubleshooting by an experienced electronic tech. I would look for something wrong in these two parts of the circuit.

Apr 18, 2011 | Mackie HD1801 Powered Subwoofer (1600...

1 Answer

Behringer xenyx 2442fx : I need to know the correct voltages out of power-supply. Mixer has been seen by a previous tech and now FX area and mixer level leds are off (I've been a user of this mixer...


You should find pwer supply voltages of +/- 15 volts going to most of the op-amps.
You should find 48 volts for the phantom power source.
You should find 5 volts for the FX DSP or any other logic circuits.
You should find a +12 volt.

Here is a manual close to your unit (yours is an expansion of it):

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

Feb 13, 2011 | Behringer XENYX 2442FX Mixer

1 Answer

HI My Rowland Kc60 suddenly has no power. I presume it is shorted out...can I replace the fuse myself, and if so - where and what fuse do I buy and how do I access it on the amp?


Here is a link to the manual:http://lib.roland.co.jp/support/en/manuals/res/1811247/KC-60_e2.pdf Page 9 states that there is a protection circuit built into the power supply. Follow the directions for turning the power on in the manual. If the amp doesn't power up you will have to have it serviced by a qualified Roland tech as there is likely to be some damaged circuitry that won't be repairable without the schematic, parts and safe repair procedures.

Oct 18, 2010 | Roland Kc60

2 Answers

Radio switches off automatically every five minutes


Press the power button repeatedly as you turn it on to set the snooze mode, or change back to perpetually on.

Apr 19, 2010 | Digi-Tech Digitech Vocalist Live 4...

1 Answer

Hi! Im looking for the service manual or schematic for the Digitech Valve Fx guitar eff.proc. The unit can turn on, and in bypass mode has a clear sound, but in normal operation has terrybly noisy, It...


hello,
can be too late but one never knows:
http://mesnotices.fr/314159.php?k=b7e42b97c5e87d24451de2516f66eef9&ID=18334&q=DIGITECH%20VALVEFX
you must simply answer the questions to be able to download.
@+
Philippe to France

Jun 10, 2009 | Digi-Tech Digitech Vocalist Live 4...

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