Question about Roland Music
Posted by Anonymous on
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Posted on Jan 02, 2017
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
What part of it got wet will determine the course of action.
If the whole unit were submerged, the unit may prove more time consuming to try to fix than to locate a used one. However, I have salvaged imersed laptops before. the procedure is not much different- make sure the unit is as dry as you can possibly make by blowing a fan on it for an extended period of time.- Days.
Once dried, use some contact cleaner on the jack contacts and interupts, any manual control and any switch.
You can then apply power. If nothing lights up, check and replace fuses as needed. Also check the power supply board for failed caps or rectifiers.
Once the power supply is known to be functional, systematically check the LCD display and the aspects of the amp that it controls. This board will be the most vulnerable and most likely to be the source of most issues you will encountr.
If the display survived intact, and amp does nto work, apply a signal to the inputs and trace the signal through the amp with a set of headphones set up with test prods. The problem will be where the signal stops.
Posted on Apr 27, 2012
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