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Pastor-of-Muppets Platinum Member
Joined: 06 Jan 2010 Posts: 774 Location: UK
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Posted: Mon Feb 21, 2022 6:06 pm Post subject: Sample Select knob jumps about |
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I bought a secondhand microSampler after GASing for one since they first came out. It seems to work fine apart from the Sample Select knob. If I press the [KEYBOARD] button next to it and then slowly turn the [SAMPLE SELECT] knob from its start position, the display shows 01, 02, 03, 17, 09, 11, 13 and keeps jumping about like that, until I get to about 12 o'clock on the dial, and then beyond that the display just shows "--------".
Am I misunderstanding how that knob is supposed to work? Is it supposed to cycle through them in order, or is that "random" order being shown due to having those samples assigned to keys in that order or something?
If it's not supposed to do that, any idea what's wrong and if it can be easily fixed? Is a bit of WD40 likely to help or make it worse? Should I crack the thing open and check the solder joints? |
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voip Platinum Member
Joined: 27 Nov 2014 Posts: 3789
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Posted: Mon Feb 21, 2022 7:39 pm Post subject: |
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It is likely that contact oxidation inside the rotary control is the issue. Rotating the selector knob a few times in either direction, before powering up the sampler, should at least provide a temporary solution. If this improves matters then at least this confirms that this is indeed the problem.
Some encoder types can be disassembled whilst still attached to the circuit board, and the contacts cleaned, taking care not to damage the delicate contacts.
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Pastor-of-Muppets Platinum Member
Joined: 06 Jan 2010 Posts: 774 Location: UK
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Posted: Tue Feb 22, 2022 7:41 pm Post subject: |
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Thanks for the reply. Rotating it before powering up seems to make no difference |
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SeedyLee Platinum Member
Joined: 13 Sep 2006 Posts: 1377 Location: Perth, Australia
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Posted: Thu Dec 14, 2023 1:58 am Post subject: |
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Don’t use wd40! If you must, at least use a specialised electrical contact cleaner, but be aware that all such cleaners can displace any lubrication or grease in the mechanism. For an encoder, disassembly is recommended.
It’s probably easier to simply buy a new encoder, if they’re still an available OEM part. _________________ Current Equipment:
Korg Kronos 2 88, Reface CS, Roland JV-1080, TE OP1, Moog Subsequent 37, Korg ARP Odyssey, Allen & Heath Zed 18, Adam F5, MOTU MIDI Express XT, Lexicon MX200 & MPX1, Yamaha QY700, Yamaha AW16G, Tascam DP008ex, Zoom H6, Organelle, Roland J6 & JU06A
Previous: Triton LE 61/Sampling/64MB/4GB SCSI, MS2000BR, Kronos 1 61, Monotribe, NanoKontrol, NanoKeys, Kaossilator II, Casio HT3000, Roland VP-03, Reface DX, Novation Mininova, MPC One |
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