Nick,
Put one module back in at a time and see which one is dragging the supply
down. After that, it should be an easy fix.
Regards, Jim
At 04:46 PM 1/18/2010, you wrote:
Ike-
So we disconnected the power to the cue send modules, the echo send
modules, the 2 mix module, 2 mix to cue module, and the oscillator
module. With those modules disconnected we got the voltage on the power
supply back to +/-18v with the master module connected.
Right now looking for input as to what would driving the voltage down in
those disconnected modules?
Thanks again for all the help
-Nick
On Mon, Jan 18, 2010 at 11:07 AM, NS
<<mailto:[email protected]>[email protected]> wrote:
Ike-
Thanks for your insight
This console was made it 78' and we are not sure if it is a series III or
a series II as there seems to be no rectifying diodes outside of the power
supplies as the power comes in from the cables and is fed directly to the
master module while the other supply feeds the bus modules.
We have disconnected that master module from the power and disconnected
the ribbon that feeds the input modules power and logic and am still not
getting the correct voltage out of the supplies when it is hooked up to
the console.
I've tried to use one supply to hook up one side of the console and this
problem still remains. Given that both the power to the master module and
input modules are disconnected would be anything in the bus modules that
could be shorting me out?
Once, again, thanks for your time and appreciate the help
-Clark
On Jan 18, 2010, at 5:38 AM, Ike wrote:
> Two PS's are probably summed through diodes (usually 3 pins of a bridge
rectifier). Check these for shorts, they should be on the panel where the
supplies connect to the desk. You may be shorting the two supplies'
outputs together. Another thing to try is to see if the board will run on
one supply with fewer channels powered, like 24+ the master section. This
would also point to a problem with the PS input panel.
> Ike
>
> Sent from my iPhone
>
> On 2010-01-17, at 2:36 PM,
<mailto:[email protected]>[email protected] wrote:
>
>> I have a series 3 console that was custom built for Lonnie Mack, circa
>> 1978, 36 channels 24 bus. There are 2 power supplies, 1 supply lost the
>> -18 due to one of the legs of the TIP145 transistor breaking. It made
>> the other transistor in the other supply get burnt. We have repaired
>> both supplies but when we put power to the console, there seems to be a
>> short as the +/- 18 volts are down to 7 & 0 volts. Something has
>> definitely shorted out or something. I have disconnected the power from
>> the master module, and the channels that were fed off of the ribbon
>> cable and re tried the power, now I had +/- 7 volts. When the supplies
>> are not hooked up they read the correct voltage.
>>
>>
>> Looking for some help and where to start looking for the problems
>> Thanks ahead in advance,
>> Clark
>>
>>
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