Repair or Part Replacement Instructions

If you think your LinnStrument needs repair, please first glance over the FAQ page, "Problems" tab, as well as the relevant section of the Panel Settings page and other links on this page. Often the solution requires only a setting change or something simple. If you don't find a solution there, please contact me (Roger) at support@rogerlinndesign.com or +1 510 666-6930 (doesn't accept voice messages) with your serial number and a brief but clear description of the problem. A brief video demonstrating the problem is very helpful. Once I understand the problem, I'll be able to tell you quickly what is needed. If a repair is needed, I designed LinnStrument is that all repairs can be done by sending you a part that you can replace yourself by following a video. Please do not send your LinnStrument back unless I've asked you to.

If I do ask you to replace a part, click one of the topics below to expand instructions for replacing the specific part.

Thank you,
Roger

Replacing the top panel or white playing surface

Here's a video showing how to replace the top panel. It shows the large model but the 128 is identical except for the length. If you're replacing the white playing surface, simply install the new surface instead of replacing the existing one.

However, some people have found this video's instructions about tightening the panel screws to be confusing, so please also read the text below in order to correctly align the white playing surface to correctly tighten the panel screws:

When replacing the white playing surface and top panel, note that the white playing surface is intentionally made slightly small, so you must stretch it slightly while attaching the screws. This stretching will help prevent the playing surface from becoming loose if hot weather causes the silicone material to expand. Also, note that the screws press together the electrical contacts of the internal touch sensor and circuit board. So if a screw is too loose, the sensor won't make contact and Y-axis may not work on the nearly columns. Or if too tight, the silicone rubber will bulge out and not look pretty. The panel screws can be tightened within a very wide range and still work fine. Here's how to correctly stretch the playing surface and to correctly tighten the screws: 

1) align the white playing surface centered on the sensor and circuit board below it.
2) Replace the top panel, aligning the 8 left-side control buttons in the 8 holes of the panel.
3) Insert 2 screws above and below the left column of pads and tighten them using this giuideline:

Tighten the screw until its head is level with the top panel and you start to feel the increased resistance of the screw being fully seated in the hole. Then tighten an additional 1/4 turn only and no more.

4) Now stretch the right side of the playing surface slightly such that there is a 1mm margin between the edges of the pads and the inside edge of the top panel. 1mm is half the distance that is between any 2 pads. While holding the playing surface stretched, tighten the 2 screws above and below the right column using the above tightening rule.
5) Insert the screws along the rear edge, stretching the rear edge of the playing surface so that there is a 1mm border between the upper edge of the pads and the inside edge of the top panel, then tighten the screws using the above rule.
6) Insert the screws along the front edge, stretching the front edge of the playing surface so that there is a 1mm border between the lower edge of the pads and the inside edge of the top panel, then tighten the screws using the above rule.
7) Insert the 2 left-side and 2 right-side screws, tightening only enough that the screw head is level with the top panel and no more.
8) To insure that the screws are tightened correctly, test Y-axis response on one pad within each column by moving your finger forward and backward while watching a MIDI monitoring app to check for CC74 (default) output, or any other way to verify that Y-axis is working. If one column isn't sending Y-axis, tighten the screw above or below that column by 1/4 turn to fix it.

Replacing the touch sensor sheet

If you live in hot weather and your replacement touch sensor sheet arrived warm, give it some time to cool down.

Here's a video showing how to disassemble and reassemble your LinnStrument. It shows the large model but the 128 is identical except for the length. Follow the video to:

1) Remove the top panel screws and top panel,
2) Peel off the white playing surface,
3) Carefully remove the black Touch Sensor Sheet from the circuit board,
4) Fast-forward to position 7:00 and carefully insert the new Touch Sensor Sheet with the electrical contacts on the long edges facing down and the spacing tabs facing up.
5) Replace the white playing surface,

Next you will replace the top panel. Note that the white playing surface is intentionally made slightly small, so you must stretch it slightly while attaching the screws. This stretching will help prevent the playing surface from becoming loose if hot weather causes the silicone material to expand. Also, note that the screws press together the electrical contacts of the internal touch sensor and circuit board. So if a screw is too loose, the sensor won't make contact and Y-axis may not work on the nearly columns. Or if too tight, the silicone rubber will bulge out and not look pretty. The panel screws can be tightened within a very wide range and still work fine. Here's how to correctly stretch the playing surface and to correctly tighten the screws: 

6) align the white playing surface centered on the sensor and circuit board below it.
7) Replace the top panel, aligning the 8 left-side control buttons in the 8 holes of the panel.
8) Insert 2 screws above and below the left column of pads and tighten them using this giuideline:

Tighten the screw until its head is level with the top panel and you start to feel the increased resistance of the screw being fully seated in the hole. Then tighten an additional 1/4 turn only and no more.

9) Now stretch the right side of the playing surface slightly such that there is a 1mm margin between the edges of the pads and the inside edge of the top panel. 1mm is half the distance that is between any 2 pads. While holding the playing surface stretched, tighten the 2 screws above and below the right column using the above tightening rule.
10) Insert the screws along the rear edge, stretching the rear edge of the playing surface so that there is a 1mm border between the upper edge of the pads and the inside edge of the top panel, then tighten the screws using the above rule.
11) Insert the screws along the front edge, stretching the front edge of the playing surface so that there is a 1mm border between the lower edge of the pads and the inside edge of the top panel, then tighten the screws using the above rule.
12) Insert the 2 left-side and 2 right-side screws, tightening only enough that the screw head is level with the top panel and no more.
13) To insure that the screws are tightened correctly, test Y-axis response on one pad within each column by moving your finger forward and backward while watching a MIDI monitoring app to check for CC74 (default) output, or any other way to verify that Y-axis is working. If one column isn't sending Y-axis, tighten the screw above or below that column by 1/4 turn to fix it.
14) Perform a Touch Sensor Calibration, as described on the Panel Settings page, Global Settings tab, "Actions" section, "Calibrate" subsection. This will teach the internal computer the exact boundaries of each of the pads.
15) Change the value of the "Touch Sensor Prescale" setting. To learn how to do this, open the Panel Settings page, Global Settings tab, and search for "prescale". On the large LinnStrument, set it to 75. On LinnStrument 128, set it to 90.

Replacing either the Main (larger) or LED (smaller) circuit board

Note that replacing your Main (larger) circuit board will reset all of your settings to new factory defaults.

Here's a video showing how to disassemble and reassemble your LinnStrument. It shows the large model but the 128 is identical except for the length. Follow the video to:

1) Remove the top panel screws and top panel,
2) Peel off the white playing surface,
3) Remove the circuit board assembly from the chassis, being careful not to apply any force to the black Touch Sensor Sheet,
4) On the back of the circuit board assembly, remove the 6 (4 on LinnStrument 128) hex nuts and ribbon connector, then separate the 2 circuit boards,
5) If replacing the main (larger) circuit board, carefully remove the black touch sensor sheet from the top of the board, following the video's instructions. Replace the old Main board with the new Main board and reinstall the touch sensor sheet to the top. Then attach the two boards together with the hex nuts and reattach the ribbon cable.
Or if replacing the smaller LED board, attach the new LED board to the Main board with the hex nuts and reattach the ribbon cable.
6) Reinsert the circuit board assembly back into the chassis,
7) Replace the white playing surface,

Next you will replace the top panel. Note that the white playing surface is intentionally made slightly small, so you must stretch it slightly while attaching the screws. This stretching will help prevent the playing surface from becoming loose if hot weather causes the silicone material to expand. Also, note that the screws press together the electrical contacts of the internal touch sensor and circuit board. So if a screw is too loose, the sensor won't make contact and Y-axis may not work on the nearly columns. Or if too tight, the silicone rubber will bulge out and not look pretty. The panel screws can be tightened within a very wide range and still work fine. Here's how to correctly stretch the playing surface and to correctly tighten the screws: 

8) align the white playing surface centered on the sensor and circuit board below it.
9) Replace the top panel, aligning the 8 left-side control buttons in the 8 holes of the panel.
10) Insert 2 screws above and below the left column of pads and tighten them using this giuideline:

Tighten the screw until its head is level with the top panel and you start to feel the increased resistance of the screw being fully seated in the hole. Then tighten an additional 1/4 turn only and no more.

11) Now stretch the right side of the playing surface slightly such that there is a 1mm margin between the edges of the pads and the inside edge of the top panel. 1mm is half the distance that is between any 2 pads. While holding the playing surface stretched, tighten the 2 screws above and below the right column using the above tightening rule.
12) Insert the screws along the rear edge, stretching the rear edge of the playing surface so that there is a 1mm border between the upper edge of the pads and the inside edge of the top panel, then tighten the screws using the above rule.
13) Insert the screws along the front edge, stretching the front edge of the playing surface so that there is a 1mm border between the lower edge of the pads and the inside edge of the top panel, then tighten the screws using the above rule.
14) Insert the 2 left-side and 2 right-side screws, tightening only enough that the screw head is level with the top panel and no more.
15) To insure that the screws are tightened correctly, test Y-axis response on one pad within each column by moving your finger forward and backward while watching a MIDI monitoring app to check for CC74 (default) output, or any other way to verify that Y-axis is working. If one column isn't sending Y-axis, tighten the screw above or below that column by 1/4 turn to fix it.
16) If you replaced the larger Main (larger) circuit board, you must perform a Touch Sensor Calibration, as described on the Panel Settings page, Global Settings tab, Actions section, "Calibrate" subsection.
17) If you replaced the Main (larger) circuit board, you must change the value of the "Touch Sensor Prescale" setting. To learn how to do this, open the Panel Settings page, Global Settings tab, and search for "prescale". On the large LinnStrument, set it to 75. On LinnStrument 128, set it to 90.

Replacing a broken USB jack

First click the FAQs link at left/top, then click the "Problems" and read the FAQ "My USB jack appears to be physically damaged. For example, if I look closely into the jack, I see some bent pins. Or it has come loose inside the chassis. What can I do?" If you choose option #1 and have a LinnStrument 128, or a LinnStrument 200 with serial LNL00700 or higher, here's how to replace the USB jack, which is part of the Main (larger) circuit board:

Read the above section "Replacing either the Main (larger) or LED (smaller) circuit board" to learn how to disassemble the unit and remove the Main circuit board. Then replace the broken USB jack with the new USB jack before reassembling the unit.

Note that it's possible to replace the USB jack without removing the touch sensor sheet or LED board from the Main board, but if you choose keep them attached, be careful not to damage the fragile and expensive touch sensor sheet while replacing the USB jack.

Also, note that because you are not exchanging the Main board or touch sensor sheet, it is not necessary to do a new Calibration or change the Touch Sensor Prescale after reassembly.