Neotek Series III 36/24 schematics?
John Forrestal
Ike Zimbel
On Nov 25, 2021, at 8:01 AM, John Forrestal <john.d.f...@gmail.com> wrote:
Hi all,
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John Forrestal
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Jason Kingsland
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Ike Zimbel
Mike with an obviously recycled CPC-to-tails that had a different
pin-out than the CPC on the desk it was meant for. I can't recall if the
error was on the cable or on the desk. In any case, since this was also
happening with your original supplies, it points to a possible power
wiring issue in your desk. I would start at the CPC on the back of the
desk and follow the wires. You are most likely looking for a break in
the wiring since the connectors are unlikely to have re-pinned themselves...
If you can access a place to measure voltage when the desk is powered up
(the ribbon cables across the backs of the meters would be a good place
to look as they are often exposed), see if you can see all of the power
supply voltages with a DMM (you DO have a meter, yes?).
One other thing...I'm not really familiar with the S-3, but if it has
peak lights on the channels, do they light up and stay lit when the desk
is powered? It occurs to me that the desk may be ok but the break in the
wiring (or possibly an improperly mated Molex connector) may be only
going to the meter bridge. It's ALSO possible that the desk is fine but
there is an issue with the meter control voltage which typically comes
from one of the master modules. This is an overall trim that sets all of
the LED meters to a pre-determined level, such as +4dBu when the "0" LED
is lit. I have seen that circuit fail.
Can you hear audio through the desk? If you can, it points to the above
paragraph. If all you get is a massive hum, it points to the first
paragraph.
iz
On 2021-11-25 8:23 a.m., John Forrestal wrote:
> Hmm… peculiar - the power supply for the board is a brand new one I
> bought direct from Mike last year, and the same issue occurred with
> the old power supplies I had for the unit. Unless I have something
> wired incorrectly?
>
>
>
> On Thu, Nov 25, 2021 at 8:15 AM Ike Zimbel <ik...@zimbelaudio.com> wrote:
>
> Meters pegging (and staying pegged) is usually a symptom of one of
> the +/-18v rails in the power supply being bad. So, the first
> thing to do is verify that your power supply is working properly.
> Do not rely on the LED’s on the front to confirm the various
> voltages as they will still light up if there is too much voltage
> present. Specifically, shorted pass transistors will put out ~ 26
> volts out the 18 volt rails.
>
> Ike Zimbel,
> Zimbel Audio Productions
> 416-720-0887
>
>> On Nov 25, 2021, at 8:01 AM, John Forrestal
>> <john.d.f...@gmail.com> wrote:
>>
>> Hi all,
>>
>> Does anyone have schematics for a Neotek series III? 36 channel,
>> 24 bus? Mine has VU meters. I have quite a few schematics for
>> series 1/2/3c consoles, just curious if there’s anything floating
>> out there for this particular board or something close to it…
>>
>> Slowly but surely going through it and trying to sort out a wonky
>> issue with meters pegging on power up, and sound not passing through.
>>
>> Happy thanksgiving!!
>>
>> John
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--
~Ike Zimbel~
Wireless frequency coordination specialist.
Manufacturer's Representative
Radio Active Designs (Canada)
~416-720-0887~
FCC:WRBX645
http://www.zimbelaudio.com/wireless-frequency-coordination/
ca.linkedin.com/pub/ike-zimbel/48/aa1/266
John Forrestal
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ik...@zimbelaudio.com
Hi John,
The internal wiring of the PS-3 you bought should be fine. What I was talking about was a mis-match between the external cabling, specifically the pin-out in the CPC connector that was wired, with tails, to the terminal strips, the same way you and Jim did with your original cabling.
If your console is hard wired internally, then virtually every point were the bus wires meet a circuit board is suspect. In your case, you would want to look at the master section first because broken joints there could certainly cause the issues you’re having.
Best,
Ike
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Riley Casey
ik...@zimbelaudio.com
Hi John,
The internal wiring of the PS-3 you bought should be fine. What I was talking about was a mis-match between the external cabling, specifically the pin-out in the CPC connector that was wired, with tails, to the terminal strips, the same way you and Jim did with your original cabling.
If your console is hard wired internally, then virtually every point were the bus wires meet a circuit board is suspect. In your case, you would want to look at the master section first because broken joints there could certainly cause the issues you’re having.
Best,
Ike
From: neote...@googlegroups.com <neote...@googlegroups.com> On Behalf Of John Forrestal
Sent: November 26, 2021 6:26 AM
To: neote...@googlegroups.com
Subject: Re: [Neotek] Neotek Series III 36/24 schematics?
Thank you both Jason and Ike for your replies! That's good to know about the new/refurbed Neotek PSUs... had no idea. I just as soon assumed it was a safer and simpler decision to go with that than to try and piece together one from a bunch of Acopian units or similar. I'll have to look inside of it to make sure it's wired as suggested. The PSU has a terminal block on the back that Jim @ Analogbros and I wired the previous owner's cabling to, reverse engineering his pinouts for the power supply cables (he had rewired all power cabling to two 14-pin Amphenol connectors). Nothing seemed off, and the console powers up but the same issues that existed with the previous PSUs continue to exist, which to me suggests it's not the PSU but something in the console...
To view this discussion on the web visit https://groups.google.com/d/msgid/neotekusers/CAMQA-jQVB_%2B0ycNQSfunqM6G8R%3DSQ_OBDPBQPxYy9DxdGhzxxA%40mail.gmail.com.