AdrenaLinn I, II or III Repair Needs


Read This First


Except for early AdrenaLinn I units without Phones jack, AdrenaLinn I, II and III use the same hardware. The differences are two plug-in chips on the circuit board and the front panel label. (See "AdrenaLinn I, II & III Hardware Differences" above for details.) Because of this, any hardware repair issues are nearly the same for all three products.


If you think your unit needs repair, there's usually no need to send it out because in most cases we can send you a user-replaceable part or board that will allow you to fix it yourself. The first thing to do is read the Repair Problems and Solutions section below to see if it's a simple fix. Then contact us at with 1) your serial number and 2) a clear description of the exact problem, and we'll help you figure out whether it's in warranty and if not, what's the fastest and cheapest way to fix it.


If any of the problems listed below require parts, you can either buy them from us (minimum parts charge $20) or in many cases (as described below) buy them much cheaper from After looking below, if you need further help, answers or need to order parts, contact us at






Circuit Description



Possible Repair Problems and Solutions


As reliable as AdrenaLinn I, II and III are, some problems have occurred. Here are some of the problems we've seen along with suggested solutions.



If the panel lights appear to work correctly, the outputs produce some sound, and turning any knob or pressing any button produces a change in the lights, but you think something is wrong


There's a good chance that nothing's wrong but you may have accidentally changed a setting and don't know how to change it back. If you don't mind losing any presets or drumbeats you've created, try initializing your unit to factory-new status: while holding both foot switches, connect power, then continue to hold both for about three seconds until the display shows 'ini', then release.



If your unit is working OK but you think a specific features isn't working correctly


Your unit may be running an early software version that contained some bugs. Check the Support page for your model (AdrenaLinn, AdrenaLinn II or AdrenaLinn III) and click the Software Versions button to learn if you have the latest version and how to update.



If the unit doesn’t function, but shows “dSP” a few seconds after powering on:


In nearly all cases, this means that the smaller of the two plug-in chips on the circuit board has failed. Because the two chips together contain the operating software, they should both be replaced at the same time. You can order a replacement pair of chips containing the latest software for either AdrenaLinn, AdrenaLinn II or AdrenaLinn III on our online store. The procedure is simple and most users have no trouble doing it themselves. If you have an AdrenaLinn III and are still under warranty, contact us and we'll send you replacement chips for free.


It's also possible in an older unit that the pins on the smaller of the two plug-in chips aren't making good contact with the socket, and often placing a small 1/16 inch spacer under the chip causes it to make better contact. To do this, use our Chip Change Instructions as a guide. Start by removing the smaller chip. (Instead of the chip removal tool shown in the instructions, you can use a pushpin or the unfolded end of a paper clip.) For the needed spacer, a cutout from the cardboard back of a pad of paper works well. Place the spacer into the bottom of the socket, then reinsert the chip into the socket on top of the spacer. Connect power and try it out to see if this fixed it.



If the panel lights appear random when power is connected


This usually means that the internal computers are not starting correctly. In an older unit, this may be due to the 2 internal plug-in chips not making good contact with their sockets. To clean the sockets, use our Chip Change Instructions to disassemble your AdrenaLinn, then simply remove and reinsert the 2 plug-in chips. (Instead of the chip removal tool shown in the instructions, you can use a pushpin or the unfolded end of a paper clip.) Removing and reinserting the chips will clean the pins on the chip and socket and may fix the problem. Also, sometimes the smaller of the two plug-in chips isn't making good contact with the socket, and placing a small 1/16 inch spacer (for example, a piece of thin cardboard) under the chip may cause it to make better contact.


If the above doesn't work, it is possible that one or both of the 2 plug-in chips has failed. You can order a new set of chips for your AdrenaLinn model from our online store.


If neither of the above fixes the problem, this usually indicates a fault in the circuit board. It is more expensive to repair the circuit board than to purchase a new circuit board from us, which costs $200 and replaces all internal electronics except the 2 plug-in chips. In that case, contact us about obtaining a new circuit board.



If the unit sometimes stops outputting all sound, fixed only by power off and on:


This seems to be due to early AdrenaLinn units being more sensitive to high static electricity shocks than we'd prefer. At this time the only solution is to--during periods of high static electricity--insultate the two foot switches with tape and use audio cables with insulated jacks instead of metal ones. Sorry we don't yet have a better answer.



If one of the rotary encoders doesn't function, or only increments or only decrements :


Turning any rotary encoder should cause the 3-digit display to change (in most operation modes). To test, press MAIN, then turn the encoder in both directions. It should decrement the display value when turned left and increment it when turned right. If it only increments in both directions or only decrements in both directions, or does nothing, the rotary encoder is faulty and needs replacement. Please contact us to arrange for repair at your nearest service center.


Or if you are familiar with soldering electronics and would like to replace it yourself, you can either buy the part from us ($20 minimum parts charge) or buy the same part (a Panasonic EVE-GA1F1724B) for around $1 from To replace it, you'll need a soldering iron, Desoldering Pump (usually around $10), long-nose pliers and diagonal cutters. Here are the steps:


1) Using the diagonal cutters, cut the 5 pins that hold the faulty encoder to the board and discard it. (Don't try to unsolder the encoder's 5 pins at once; you won't be able to keep them all hot at the same time.)

2) Remove each of the 5 cut pins from the board one at a time by heating it and using long-nose pliers to gently pull it out. (Don't pull hard as you may damage a circuit board trace, making the entire board useless.)

3) Using the desoldering pump, suck all solder out of the 5 holes.

4) Place the new encoder into the 5 holes and, pressing it flush to the board, solder all 5 pins.



If no panel lights turn on and nothing is heard in outputs when power is connected, or

if you connected the wrong power supply and think you may have damaged your unit:


First, if you're not using the included AdrenaLinn power supply, check your supply to see if it meets AdrenaLinn III's power requirements: 9 volts DC, at least 500 milliamps, and the round connector at the AdrenaLinn side must fit correctly and the center conductor MUST be positive, not negative like Roland power supplies. (Connecting a center-negative supply like those from Roland will likely damage your AdrenaLinn.)


Next, test the power supply to see if it's working, putting out approximately 9 volts DC. If you don't have a voltmeter, here's a simple test: touch the end of the round connector to your tongue. If it's working, you should feel a mild shock, just as if you touched a 9 volt battery to your tongue.


If your power supply is working and your AdrenaLinn shows no lights when power is connected, this usually means that you accidentally connected the wrong power supply, which damaged one or more of AdrenaLinn's power components. To verify this, disassemble the unit and remove the circuit board, then check the area near the power connector but on the opposite side of the board. Do any of the small parts appear burnt? Here's a photo of how the board should appear. Usually, one of the following parts will be damaged:


"SD1": Diodes Inc. SMBJ12A-13 (zener TVS, unidirl 12 volt 600W)

"D23": Diodes Inc. B340-13 (Schottky diode 40V 3A SMC)

"FB12" or "FB13": HI1206N101R-10 (ferrite bead 3A 100 ohm size 1206)


If you do see damage, then your AdrenaLinn needs repair. Please contact us to arrange for repair at your nearest service center.


Or if are familiar with soldering electronics (or have a local service center you like) and would like to save some money, you can buy the above parts and install them yourself. You can either contact us to buy the parts (minimum parts charge $20) or buy the same parts from for less than $1.



If the PHONES output produces loud static noise but the stereo outputs sound OK:


Before approximately serial number A08250, we had a circuit design error that could cause this problem, though rarely. Please contact us to arrange for repair at your nearest service center.


Or if are familiar with soldering electronics (or have a local service center you like), click here for the very simple solution, requiring soldering a very short wire to the circuit board.



If the INPUT LEVEL potentiometer feels loose and spins freely:


Turning the INPUT LEVEL control with an input signal source connected should change its volume at the output. However, if it feels loose and spins for multiple turns, the black shaft has probably broken off, leaving a small plastic piece in the center hole of the pot. Please contact us to arrange for repair at your nearest service center.


Or, if are familiar with soldering electronics (or have a local service center you like), you can repair it yourself:


1) Contact us to order a new "Input level pot shaft" (minimum parts charge $20). When you receive it:

2) Disassemble the unit (using the "general disassembly instructions" above) and remove the circuit board from the chassis. The black plastic shaft will probably fall out of the chassis and you will see the small broken-off black plastic piece stuck in the center hole of the pot.

3) Notice that the pot has 3 pins-- 2 close to the 3-digit display and a third pin closer to the rear-panel jacks. Unsolder this third pin (which will probably require a desoldering pump) then tilt the pot up on its 2 remaining pins so that it stands perpenticular to the board.

4) Using a pin or paper clip, push it through the rear of the pot's center hole in order to push the broken-off piece out through the front.

5) Bend the pot back to its original position and solder the pin back in place.

6) Push the new "input level pot shaft" into the pot's center hole. Test to insure that it moves only the normal range of the pot.

7) Reassemble the unit.



If one of the four small black buttons doesn't move freely or doesn't produce a firm click when pressed


It is likely that the front panel label was attached to the chassis with poor alignment, probably when our AdrenaLinn II or III upgrade kit was installed. To test this, disassemble the unit and remove the circuit board, then press the same button. If it moves freely now, then the fault is the label alignment. To fix it, carefully remove the front panel label and reattach it as described in the AdrenaLinn III Upgrade Kit Installation Instructions.



If one of the four small black buttons moves freely and produces a firm click, but produces no response when pressed


To test the MAIN, UP ARROW and DOWN ARROW buttons, alternately press MAIN or UP ARROW, then alternately press MAIN and DOWN ARROW. Each press should cause a change in the panel lights. To test the SEQUENCER button, repeatedly press the DOWN ARROW button until the DRUMS row is lit, then repeatedly press SEQUENCER. Each press of SEQUENCER should cause a change in the panel lights. If not, then the button is faulty and needs to be replaced. Please contact us to arrange for repair at your nearest service center.


Or if are familiar with soldering electronics (or have a local service center you like), please contact us to order the replacement switch (minimum parts charge $20) and do the simple installation yourself.



If you suspect a faulty foot switch:


Pressing the 2 foot switches should change the status of the lights near each switch. It is possible to set certain parameters so that this does not happen, so if either light doesn’t change, contact us and we’ll tell you how to verify that it's broken or working, and if necessary, how to get it repaired.



Roger Linn Design

Los Altos, CA