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Author Topic: Broken MC-1 - Where to send for Repair?  (Read 4454 times)

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aoresteen

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I have two ADA MC-1 foot controllers.  One is dead, it does not power up.  The other one works perfectly.

Where should I send the broken MC-1 to for repair?

Thanks!
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rnolan

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Re: Broken MC-1 - Where to send for Repair?
« Reply #1 on: Time Format »

You may be able to fix it yourself. How are you with electronics ? I don't think the MC-1 is particularly complicated and MJMP or others may be able to step you through the fix. It's certainly worth opening it up and check for anything obvious.
So your in Newnan GA USA, not sure where that is or who's the closest decent tech. Others here should have some recommendations.

@ MJMP, do you have a schematic for the MC1 ?
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Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

MarshallJMP

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Re: Broken MC-1 - Where to send for Repair?
« Reply #2 on: Time Format »

Nope no schematics for the MC-1.

The MC-1 isn't that easy to fix,you need a scoope or a logic probe to check it out.You can try to measure the 5V and after that it's ll digital.
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rnolan

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Re: Broken MC-1 - Where to send for Repair?
« Reply #3 on: Time Format »

IIRC It's based on a Zialog Z80 CPU. We had to write a Z80 emulation program in Pascal when I was at uni, interesting assignment.
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Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

aoresteen

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Re: Broken MC-1 - Where to send for Repair?
« Reply #4 on: Time Format »

Thanks all!

I'm ok with electronics.  Issue is my bench is not set up.  I do have a scope & probes.  I'll look at the 9v/5v power feed and see if that brings it back to life.

I was hopping that there is someone out there that knows the MC-1 and can fix it faster than I can.
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MarshallJMP

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Re: Broken MC-1 - Where to send for Repair?
« Reply #5 on: Time Format »

Well i could fix it for you but then you'll have to ship it to belgium.Since you have the equipment that would be a bit stupid.Let's try to fix trough this topic or email.So first check the 5V,starting from the dc adaptor input trough a diode (1N400x),then a cap into a 7805 regulator.If you have 5V at the output of the 7805 then the next thing to check is if you have a clock signal on pin 6 of the Z80 ┬Ácontroller.I need to check it out but i think it works on 2MHz.I have the pcb of MC-1 here and it seems it has a 4MHz crystal (buffered by a 74HC04 (hex inverter) pin 1 and 2) going to pin 3 of a 74LS74 (D flip flop),there it will be devided by 2 so you will have 2MHz on pin 5 of the 74LS74 then it goes to pin 3 of the 74HC04 and pin  4  goes to pin 6 of the Z80.Also make sure sure pin 26 (reset) is high (5V).
I hope this makes sence,if not let me know.BTW the 74hc04 is on the right side of the crystal,the LS74 on the left side.
« Last Edit: Time Format by MarshallJMP »
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Dante

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Re: Broken MC-1 - Where to send for Repair?
« Reply #6 on: Time Format »

MJMP to the rescue!!! (again)
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ADA Gear: MP-1 Classic | MP-2 | Viper Combo | MicroTube 200 | MicroFet | MXC w/Quad Switch

rnolan

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Re: Broken MC-1 - Where to send for Repair?
« Reply #7 on: Time Format »

MJMP to the rescue!!! (again)
+1  :thumb-up: :bow:
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Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

MarshallJMP

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Re: Broken MC-1 - Where to send for Repair?
« Reply #8 on: Time Format »

 ::)
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chrismilne

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Re: Broken MC-1 - Where to send for Repair?
« Reply #9 on: Time Format »

Did you have any luck?  I just tried to fire mine up after many, many years and no power...
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MarshallJMP

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Re: Broken MC-1 - Where to send for Repair?
« Reply #10 on: Time Format »

Maybe a stupid question, but are you sure you're using a adaptor with the correct polarity?
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chrismilne

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Re: Broken MC-1 - Where to send for Repair?
« Reply #11 on: Time Format »

Yeah, i still have the original ADA adapter.  Though i guess it could be bad...
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MarshallJMP

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Re: Broken MC-1 - Where to send for Repair?
« Reply #12 on: Time Format »

Well that's easy checked with a multimeter.
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