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How to change Roland VGA7 guitar amp batteries?

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Posted on Jan 02, 2017

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SOURCE: ROLAND GR30 POWERS UP BUT DOES NOT MAKE A SOUND

Make sure you use the ORIGINAL AC adapter with the unit. It takes a 9VAC one.

The adapter for the GR09 will NOT work and will act the way your unit is acting.

Posted on Oct 06, 2009

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SOURCE: Roland AC-60 Amp input impedances ?

I will solve the mystery...

The impedance varies depending on how you connect. It would be too complicated to explain the impedance to the average person.

From the schematic we have the TRS 1/4 inch jack having basically 100K and parallel 220 pf cap to ground EACH signal line and 10K resistance between. (The TRS jack if used disconnects the XLR and its components)

If one uses the XLR jack, one has an ADDITIONAL 100K each side in parrallel to ground PLUS an ADDITIONAL 2.2K resistor shunting between.

In ADDITION to the above, there is effectively 160K ohms to ground each side that is the input resistance to the input OP-AMP.

The effective impedance will depend on how and where you measure it.

Not sure what peizo you are using... For one on wife's violin we go into a X2 wireless which has about 1.6 Megohm. The receiver of course is fairly low impedance drive to the amp.

For the violin (Autolycus) pickup and others, severe distortion of the waveform existed when run directely into most amps and of course long cables worsened it at the high frequencies.

Posted on May 20, 2010

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1 Answer

How do I connect my roland piano 5500 to an amp


On the rear of the piano there will be two 1/4" jacks labeled Output Left and Right. One will be labled Mono as well. If you are using a stereo amp, use both, and if a mono amp use just the mono output. If your amp is a guitar type, connect a shielded cable with 1/4" phone jacks such as you'd use with an electric guitar from these jacks to your amplifier. If you are useing a home stereo amp, you will need a cable with 1/4" phone jacks from the piano to RCA phono jacks on the amp end.

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Are the speakers hooked up? volumes up? Is the guitar using active pick-ups? if so, is the battery good? is any noise coming thru the amo?

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Roland Micro Cube Amp fuse blew out. How do you fix it?


have a look here:
http://www.ehow.com/how_8698510_fix-roland-cube.html

although it doesn't mention the fuse you will probably find it. Sometimes there is a fuse access on the outer case.

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I would expect there is bad soldering or a circuit board crack. Inspect the soldering aound the leads, especially pots and heavy components. Finding all the retaining screws can be frustrating. Expect the screws for the handle to also attach to the amp chasis. They are often hiodden under plastic caps.

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Brand new chromatic tuner tu-3 pedal, plugged guitar into input and it powers on. Guitar plays through the amp, but when I hit the footswitch the check light and tuning bar do not light up.


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I have a Roland AC60 amplifier that I brought from Australia to the US. The Australian version of this amp runs on 240 volts not 110. My question is; 1) does anyone know if converting this amp to...


The only simple way that I could think of is for you to purchase a STEP DOWN TRANSFORMER rated at 500 watt, 110 volts, 60cycle. The transformer inside that amplifier have four output 12v and 15v DC.2amps It will be hard to get the transformer for that! Hope that might help you! taah!

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1 Answer

ROLAND GR30 POWERS UP BUT DOES NOT MAKE A SOUND


Make sure you use the ORIGINAL AC adapter with the unit. It takes a 9VAC one.

The adapter for the GR09 will NOT work and will act the way your unit is acting.

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1 Answer

Guitar amp signal interference.


Mine did that. Found out it was the input jacks

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