API 7600 Input Module

[gaztech]

Hi guys,

I just acquired an API 7600 input module for service.

Client tells me that "there are a few things that are not working correctly". Yeah, nice description! He can't be specific as he's using all of the multiway in/out connectors on the rear of the unit and can't remember which combinations don't work!

It's a very complicated module nad has a LOT of internal switching, lots of relays and loads of input/output permutations. Nice piece of kit but really without a schematic it's going to be impossible to test everything.

The owners manual isn't a lot of use as it doesn't seem to cover everything in the unit (not even all the output multipin sockets!) and the only way I can really test it is to make up a load of adapters.

I've looked through the schematics section on this site and this device isn;t listed at all under API. This company are notorious for not releasing schematics for anything so the chances of getting something through them are absolutely nil.

I wanted to ask.. Does anyone have a schematic of this device they could share with me? If required, I can keep it 100% confidential (contact me by PM). That means no posting it anywhere else if you so desire.

I'm almost dead in the water without it. Anyone???

Thanks in advance!

 

[kags]

Before you get too deep, thoroughly clean and exercise all the switches and pots. API stuff rarely has faults, except for opamp failures, but dirty switches can make a lot seem wrong.

 

[Brian Roth]

Does the 7600 use the (smaller) discrete 2510 opamp? Those tend to be quite unreliable.

Several folks I know swear by Scott Liebers' drop-in replacement.

https://scottliebers.com/opamps-and-studio-electronics/

Bri

 

[gaztech]

Actually, this is a complete module for an API mixer. It uses 2520 modules.

Since it drops into the mixer frame (and I don't have that) I'm going to have to test all inputs and outputs on the rear 64 pin socket. This is a bit of a nightmare. I need a schematic so that when I find an output with a signal missing I don't spend hours trying to find out where that pin comes from. The module is a sandwich design where both top and bottom PCBs component sides are facing each other. It's almost impossible to test it from either component side. At least, it I have a schematic, I can find components and then trace them by taking the unit apart. For service, it's a horrible design.

I regularly service API modules but this is the first one where I simply cannot find any schematics at all. I've exhausted all my contacts and nothing comes up via any internet searches at all.

Hopefully someone reading this might just have what I need. As I said previously, I can keep drawings to myself (or sign an NDA if necessary as I have quite few of them with various manufacturers). Can anyone help?

 

[kags]

Actually, this is a complete module for an API mixer. It uses 2520 modules.

Since it drops into the mixer frame (and I don't have that) I'm going to have to test all inputs and outputs on the rear 64 pin socket. This is a bit of a nightmare. I need a schematic so that when I find an output with a signal missing I don't spend hours trying to find out where that pin comes from. The module is a sandwich design where both top and bottom PCBs component sides are facing each other. It's almost impossible to test it from either component side. At least, it I have a schematic, I can find components and then trace them by taking the unit apart. For service, it's a horrible design.

I regularly service API modules but this is the first one where I simply cannot find any schematics at all. I've exhausted all my contacts and nothing comes up via any internet searches at all.

Hopefully someone reading this might just have what I need. As I said previously, I can keep drawings to myself (or sign an NDA if necessary as I have quite few of them with various manufacturers). Can anyone help?

Have you contacted API directly? I have received some 1608 schematics directly from APi for a studio I worked on.