| Electronics > Repair |
| Korg Electribe ER-1 mkII repair |
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| LateLesley:
--- Quote from: feedback.loop on November 06, 2019, 04:49:57 am ---Thanks for suggestions. I have seen the ones with flat top. I would think they should fit, but they will look different and probably will have different color and brightness. Should be fine if all are replaced - 17 red and 5 green ones. I still hope to find Panasonic ones. --- End quote --- Ok, I did a bit of googling. I found this place which says they have stock. https://ph.infinite-electronic.hk/product/Panasonic_LN282RPX.aspx https://www.components-store.com/product/Panasonic/LN282RPX.html I found several similar links, it seems all roads lead to HK for stock. |
| feedback.loop:
I do not know these sites. They might be fraudulent. http://www.erai.com/ERAI_Blog/3153/__Fraud_Alert__High_Risk_Websites_That_Take_Your_Money_and_Run_ They are not in this list, but have very similar names. |
| LateLesley:
Well, yeah, that is always the danger of going outside the known good suppliers. And looking at the fraud page, it does look like the logo and name have similarities. Good catch. And A good warning to all us hobbyists. Apologies for linking to them. And thank you for the warning. |
| feedback.loop:
I finally received a 10-pack I bought on AliExpress for $1.20 (1.92 with shipping) to give them a try. https://www.aliexpress.com/item/32819577430.html As I expected, they have slightly different color (brighter red), they are slightly longer, not rounded, and noticeably brighter. I believe this should work fine if all LEDs are replaced, including green ones. If someone really wants to do fine adjustments, in the unit they sit on spacers, so in principle they can be lowered, and they can, perhaps, be rounded, but that is a lot of work. I am not going to bother. They stick out a little, but it does not seem to be a problem to me. So I am thinking about ordering one more 10-pack of red ones, and a 10-pack of green ones, and replacing all of them. |
| Nedreud:
I took a chance on a dead ES-1 mkII "RHYTHM PRODUCTION SAMPLER" from eBay and no surprise it didn't work when connected with the correct power supply. Carefully comparing the schematic for the ES-1 mkI (I note it's "Provisional Version, Revision: 1.00" and therefore likely a leaked pre-production copy) and checking voltages on the board I was only getting +0.79V where I was expecting to find +5V for the DIGITAL section. I didn't spot it at first, but eventually noticed that the S8520 step-down switching regulator-controller is toast (IC39 on the board): Not as dramatic as the melted mess on feeedback.loop's ER-1 mkII, but a very similar failure. They're protected from reverse polarity, but I don't think these devices can stand an over-voltage for too long. Spec sheet says 18V is the absolute maximum the S-8520 can handle. It's not clear if F3, the CPH6302 P-Channel MOS Silicon FET, is dead too, but neither of these things are more than a $/£/€ or so. I note that the code on IC39 is BOJU, which makes in a S-8520F50MC-BOJT2U which is the S-8520 Series F, 5.0V output, 300kHz Osciallation Frequency with No Overload Protection and "Lead-free (Sn 100%), halogen-free"! For future reference for anyone else that finds themselves in a similar situation, here is a photo of the power supply area. Note that this is the ES-1mkII KLM-2507 board. I believe it's functionally the same as the mkI, but the board itself has been revised because the component numbers don't make the mkI schematic: And here is the PSU section of the schematic. Again note this is the mkI schematic for board KLM-2197, which I have overlaid with mkII component numbers in red (use at your own risk, this is my best guess tracing and inspecting the board): Thanks again to feedback.loop for his invaluable YouTube videos. |
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