Harris MX-15

[zach_morton]

I have an older Harris MX-15 exciter that I am attempting to revive and use for a backup exciter. The question I have is, this exciter has been in storage for quite some time, and has NO connectors for power.

Does anyone have the pinouts for the molex connector for the ac mains input? For that matter, the transmitter interface plug as well?

Thanks!

 

[mr_elbows]

Zach;

Am going to site tomorrow where I have an MX-15 and there's a set of manuals there

Do you need a copy ?

Gary

 

[mr_elbows]

Hello all;

Does anyone else need a copy of the manuals for the MX-15 or MS-15 ?

I'm going to sites where the manuals are tomorrow morning, if anyone wants a copy, it's yours for cost of copying + postage

Let me know at [email protected]

Gary

 

[TomT]

Zach:

Looks like Gary will get you manual copies. The connector on the back is available from Mouser, it's similar to the ones used in the Auditronics 2500 console. I have two MX's and an MS; here's what you should do to revive them:

1. Replace the can electrolytic caps on the main chassis.
2. Replace the 4" fan. To do this you need to remove the two assemblies that sit on top of the fan. One or both have small axial electrolytics, replace those & clean off everything--these assemblies get filthy.
3. There are small axial electrolytic caps on both the AFC and FM mod modules that should be replaced
4. On the AFC module, replace the soldered-in-place frequency select jumpers with two dip switches (a 4 pos and an 8 pos.) Did this a long time ago on mine. No, never caused a problem from vibration shaking the switches out of position. Yes, handy to have as you now have a frequency agile exciter.

Not sure what you mean by "transmitter interface connector"--that is the square plastic connector on the back which is also where the AC is connected. It has other connections, but all you really need is the pins used for AC input. There are connections to the AFC relay which you can use for transmitter interlock, but that also shows up on the terminal strip on the back.

If you need SCA, you need to have a card in the SCA position--all it is a pot between the SCA jack and the composite buss on the back plane. I think I may still have one--but where I am not sure!

 

[TomT]

Always help not to have to rely on memory, I got my book. The transmitter interconnect plug is duplicated on the terminal board below it. The only thing on there of importance is TB 2/terminal 30, which is the RF mute (connect to ground at either 2,5,8, or 11 on TB 1 to mute) and the AFC relay contacts (normally open--tb 2-35/36, closed when AFC locks) All the rest of this stuff is switching for the stereo geni and SCA modules,which you probably don't have and arn't going to be using.

(That's why I forgot about that connector--never needed it)

Now, the power connector is a 12 pin molex or amphenol--forget which. Mouser has them. For 110 volts hot to 9-12-3-6; neutral to 7-10-4-1; ground to 2-3-8-11.

You can also go onto the chassis, tie TB 1 (not the back panel TB 1 but inside by the fan as I remember) terminal 1 & 2 together, and 3 & 4 together. This joins the correct windings together for 110 volts. Connect AC to 1/2 and 3/4, pick up safety ground from chassis

 

[zach_morton]

Thanks for all the replies...I think I'll be busy recapping this puppy. I found it in storage, and looks otherwise intact...but since I can't power it up I really don't know what it will do yet.

I did that to an old Optimod 8100 and it works like a champ...actually put it back in service and got rid of the digital processor that was there in the first place. Sounds 100% better.