- Yamaha MOXF8 keyboard, one note plays too loud! - 6 Updates
- Astron Power Supply Repair - 1 Update
| N_Cook <diverse@tcp.co.uk>: Apr 15 05:58PM +0100 On 15/04/2017 16:23, David Farber wrote: > this translate into detecting how loud to play a note and how do you think > this relates to the note that is too loud? > Thanks for your reply. Usually 2-stage contacts, and timing the difference. Can you swap a pair of the silicone contact pad strips over , to another part of the keyboard to see if the problem moves with it. Check pull-up/down Rs between adjascent keys? Can you easily swap a multiplex line over with another? |
| "Jocelyn Goodey" <joss@goodey10.plus.com>: Apr 15 09:35PM +0100 > part of the keyboard to see if the problem moves with it. > Check pull-up/down Rs between adjascent keys? > Can you easily swap a multiplex line over with another? Try wiping the carbonised contact pads with an cotton bud soaked in IPA. If that fails try a gentle rub of the black pips with a fine emery board & wipe with IPA again. Regards Joss Tetigisti acu (Titus Maccius Plautus 254-184BC) |
| Clifford Heath <no.spam@please.net>: Apr 14 07:04PM +1000 On 16/04/17 01:23, David Farber wrote: > extends just a hair more than its adjacent rubber keypad contact. How does > this translate into detecting how loud to play a note and how do you think > this relates to the note that is too loud? It's a dual-contact pad. One of each pair should contact before the other. This behaviour is what happens when the early contact fails, and the late one does not. The controller sees nothing, followed by the late contact, so it assumes a high-velocity key-stroke and plays full volume. Fix or replace the early contact. |
| "David Farber" <farberbear.unspam@aol.com>: Apr 15 08:37PM -0700 Clifford Heath wrote: > contact, so it assumes a high-velocity key-stroke and plays full > volume. > Fix or replace the early contact. Hi Clifford, I will replace the pad assembly. Thanks for the great explanation. -- David Farber Los Osos, CA |
| N_Cook <diverse@tcp.co.uk>: Apr 16 09:03AM +0100 On 14/04/2017 10:04, Clifford Heath wrote: > late one does not. The controller sees nothing, followed by the late > contact, so it assumes a high-velocity key-stroke and plays full volume. > Fix or replace the early contact. Isn't that interpretted as a non-key press, a dead note, second contact only. I seem to remember simulating that, with placing a piece of paper under the first contact. |
| Clifford Heath <no.spam@please.net>: Apr 16 06:14PM +1000 On 16/04/17 18:03, N_Cook wrote: > Isn't that interpretted as a non-key press, a dead note, second contact > only. I seem to remember simulating that, with placing a piece of paper > under the first contact. You might have had them switched around. It's not possible to trigger on the first contact, because you don't yet know how fast the key-press is. So instead you trigger on 2nd contact - if that never happens there should be no trigger. Clifford Heath. |
| Fred McKenzie <fmmck@aol.com>: Apr 15 01:22PM -0400 In article <alpine.LNX.2.02.1704142350410.7080@darkstar.example.org>, > The guy who restarted this thread didn't even bother to say anything, just > took a 20 year old post and reposted it. > There was no question or comment. Michael- Surely someone is interested in the discussion. As I mentioned, there are a lot of the Astron analog power supplies around. The design has only slightly evolved since the 1980's, and they are still being produced. Fred |
| You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com. |
No Response to "Digest for sci.electronics.repair@googlegroups.com - 7 updates in 2 topics"
Post a Comment