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61
on: August 24, 2023, 01:46:37 PM
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Started by Rio - Last post by Synthesizer.repair
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the missing ones is IC11, IC32 from CPU board, IC8 from memory board and IC4 from ADC board.
PM me if you can help with jedec from missing PALs.
PMs seem to not be working. Would be happy to help with the missing PALs, and also would host these files permanently on our servers for users to access at https://Synthesizer.repairPlease email me and we can coordinate our effort. `ace.vanderhook@synthesizer.repair` Thanks! |
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62
on: August 20, 2023, 09:30:55 PM
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Started by who - Last post by who
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63
on: August 20, 2023, 09:07:36 PM
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Started by who - Last post by who
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Thanks for the reply! Can you suggest a display make and model?
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64
on: August 09, 2023, 12:31:29 AM
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Started by czaleschuk - Last post by czaleschuk
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I recently purchased a non-working drumulator with the intention of repairing it to use in my music. It currently will not power up.
Upon switching on, however, it outputs a quick burst of drums, maybe 6-8 sounds in rapid succession, before they stop. They sound clean and clear, and respond to the front mix volume knob. But no segment display, no LEDs, no response on any of the buttons.
Ive tested the rectifier diodes, 5v, 15v and -15v rails and all seem good. I have pulled and cleaned the board(dirty, lots of ?dog? hair) with iso and visually inspected it for broken/missing traces and have found none. There is a lot of areas with lifted solder mask on the rear of the board(top side with buttons), but all questionable traces have been verified for continuity. I have gently pulled and reseated every IC that is socketed, including the Z80 and CTC without change. I have purchased a new OS 3.0 EProm in an attempt to get something out of the front panel and that has made no difference. Still no lights, no segment display. Dead. The Z80 and CTC both seem to receive the reset signal from the CA3086. I have been able to see some waveforms on the few data lines of the z80 I could test with a cheap, audio rate only(50us horiz.) oscilloscope I borrowed. None of the front panel buttons seem stuck closed, and the ones that i have tested work. I have tried the POOF sequence and reset command without illumination and no luck.
The 6116 ICs, 13K and 15K receive 3.1v when off, and 5.2v when powered on, and the rest of the ICs in the Digital side all have 5.1ish volts on their VCC.
P.C.B. is Rev 1, 11/30/82, Serial #1049
I am pretty stuck and in need of some assistance, and simplified information regarding the bare minumum requirements for front panel illumination, and knowledge of typical Drumulator start up behaviour.
Thanks!
C.
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65
on: August 07, 2023, 11:35:59 AM
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Started by 80sboy - Last post by Synthesizer.repair
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The OEM screws are Black Oxide Grade 4.8 M3-1.0X10 flat head machine screw. We sell them in a kit suitable for the EMAX, EMAX II, E3X Contact us here e-mu.parts@synthesizer.repair to order. I'm looking for the specs for the rack screws, the little ones that hold the case together and they recess into the metal.
Thanks!
tom
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66
on: August 07, 2023, 11:28:44 AM
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Started by roginator - Last post by Synthesizer.repair
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I have ? faulty IM-368-I ? HELP, where to find one .. anybody have any spare on the stock?
Yes, We can help you! Get in touch with us here: e-mu.parts@synthesizer.repairPlease include your details and the EMAX Serial Number. Cheers! |
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67
on: August 07, 2023, 11:25:10 AM
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Started by who - Last post by Synthesizer.repair
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Yup.
Been seeing this more recently with some low-quality OLED modules that are being marketed by some sellers on ebay and other outlets.
The culprits were selling crappy Chinese displays, obviously with no quality control.
Symptoms are some pixels brightness were very dim on 2/3 of the display.
Swapped the failing display out for one of our own quality units to resolve the problem.
OLED modules in general consume less power than the OEM LCD + EL Backlight, so if anything you should see a reduction of load on the PSU when replacing a stock LCD.
Just make sure that your installer knows to remove the high voltage inverter from the front panel PCB. It is no longer needed with the OLED.
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68
on: July 20, 2023, 02:14:46 AM
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Started by Rio - Last post by Deft
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And one more update - I was able to copy an IC5 from the ADC board.
So, now we have:
1 Memory board: IC7, IC33, IC47, IC50.
2 CPU board: IC10, IC 27
3 ADC board: IC5
the missing ones is IC11, IC32 from CPU board, IC8 from memory board and IC4 from ADC board.
PM me if you can help with jedec from missing PALs.
All the best,
Kirill
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69
on: July 12, 2023, 10:46:05 AM
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Started by Deft - Last post by Synthesizer.repair
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Hello again DEFT. We can sell you a replacement PAL for a great price. Contact Sales@Synthesizer.repair, please include your name, EIII serial number, and daytime phone. Cheers! |
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70
on: July 12, 2023, 10:42:58 AM
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Started by Deft - Last post by Synthesizer.repair
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It's mostly pointless to run Alchemy in an emulator other than for nostalgia. You need a REAL Motorola powered Macintosh computer, with an RS424 port, and SCSI / MIDI hardware to interface Alchemy with any vintage samplers. If you wanna buy a restored classic Mac, and MIDI hardware for your studio, you can contact us, we have lots of options, and they come with a fully authorized version of Alchemy pre-installed.  email: Sales@Synthesizer.repair. Cheers! |
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