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Hello Joey. Could you do the dump of the new OS chips for comparing it. Or I could make the dumps of two OS chips and send you binnary) surely if you have the programer. UART and timer signals come

Did you remove (gently) and re-install the all socketed IC chips?? ? Pin oxidation can cause poor connections preventing boot. Also visually inspect soldered IC and other parts for cracks in solder

Give the output relay a tap to loosen it up a bit, then try. Sent from my HAL 9000 in transit to Jupiter

Let's take a few steps back: 1.?The K1000 powers up but does not boot. ?I see blocks on the lcd upon power up and that was it. ? 2.?I checked voltages?and they?were?ok. I also resoldered?the

Looks like OS chips. I had one with eprom chips problem. When I tested U32V2.1L checksum was failed, it's write at the label of the chip.

Wow, sorry to hear it! Haven't attacked mine yet because parts shipment is: " February 6 - 12:00 AM In Transit, Arriving Late". Don't y'all love the USPS? -- peace, Frank Dickinson 90 East

I replaced all the electrolytic capacitors in the power supply and 5 more caps in the main board. ?All the voltages are good but?the K1000 went from bad to worse-- now I am back to seeing?the

Frank, There are some very usable sub-$100 100MHz scopes on the Bay now that would be more than adequate for troubleshooting 1000_X modules.? It may not be worth the investment for just one project,

Thanks, Bill! I sold the 'scope inherited from my Dad (a tube-based Tektronix model from the 50's). It actually worked, but was huge and I had little use for it. Looked like something from an old

"To Bill: My DMM (EEVblog/Brymen BM235) is true RMS, but does not have a separate RMS chip. I think that's fine for lower frequency measurement. Let me know if you think otherwise. (I'm not an

Tantalum and ceramic caps in that form factor kinda look the

A few notes: 1. There should be only 3 tantalum caps in the 1000PX: C023, C043 and C060.? If there are more, someone's been messing around in there.? The ones next to pretty much every IC are 0.1uF

If the power supply is sagging it's most likely the power supply that's at fault.? The supply board has a good 5V regulator.? But, there's not much margin on the input to the regulator.? A bit of

There is a tantalum cap next to pretty much every IC in the 1000PX. I ordered a full set of electrolytics last night and will take that route first, especially since I've already determined that the

Ha! You’re asking me? Notta clue. Maybe they decouple, maybe not. Maybe there’s 50, maybe there’s 5. No idea. I just threw that out there because the DX7 came out around 1984 and the PX

Did you connect the Midi cable loop (input to output) before running the test? https://www.sweetwater.com/sweetcare/articles/perform-self-diagnostics-kurzweil-k1000/ -- peace, Frank Dickinson 90

Hi All, I ran the diagnostics on my non-booting K1000 and all tests pass, except for the Timer and UART. ? Every time the K1000 starts?the Timer and UART test, I?immediately hear the relay click

Hi Larry, Just opened up the 1000PX again... Are you referring to the decoupling caps? I'm pretty sure that's their function. There is one at each IC, most are K5M 104, which (if I am correct) =

I know it's OT, but I just installed a Meanwell LRS-35-5, 5 volt switching power supply in my dead Akai S1000. Connected 4 leads, drilled one hole to accommodate mounting screws, and it fired right

Thanks, Larry! I don't remember seeing any tantalum caps (I closed the unit up) but will take a look. There are other caps, but they might be ceramic. -- peace, Frank Dickinson 90 East