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Drzayuss 2nd August 2005 12:40 AM

Console Problems . . .
 
hello everyone . . . my TAC Scorpion ii has an issue with the main monitor volume knob on the s4001 master module . . . I don't know if it's a bad pot, a blown capacitor or what . . . but when I try and turn the monitor knob up or down . . . I get a lot of noise and intermittent signal over the left and right channels. I have to work the knob back and forth and tap it etc. just to get the signal in non distorted stereo. This happens every time I touch it. Not only that . . . but when I'm wrenching back and forth on the monitor knob . . . I can see minute fluctuatiuons in the stereo mix VU meter. I tried replacing the opamp (tlo72) with an LT1358 . . . but that didn't fix it. What do you guys think?

Thanks,
Justin

Jim Williams 2nd August 2005 05:22 AM

Remove the metal frame and re-solder the control room pot. If that doesn't help, replace the CD4053 cmos switch that does the dim circuit around the control room pot.

Jim Williams
Audio Upgrades

Drzayuss 2nd August 2005 07:13 AM

There doesn't seem to be a dim circuit . . . only a switch to mute the monitor out . . . and another to change the monitor out to mono . . . should I replace these switches?

Thanks,
Justin

Tim Farrant 2nd August 2005 07:57 AM

Justin,

Mechanical things are always going to break down before electronic things. I would say the pot has had it's day and needs replacing, or, the soldering of the pot to the board has come adrift. If it's not the soldering, you might be able to resurrect the pot with a spray treatment, but this will be temporary. The monitor pot gets the most use on any console and therefore is usually the first to break.

The signal also passes thru the mute switch and mono switch, these might also be getting worn out and a spray might help. The dim circuit is there, there is no switch, it dims the the monitors when using talkback. Unlikely the 4053 would be causing this problem. Pull the module, and inspect the soldering, look for broken joints.

Oh, and turn the console OFF before pulling the module!

Cheers
Tim.

Drzayuss 2nd August 2005 08:04 AM

Thanks everyone!

Justin

brianroth 2nd August 2005 08:08 AM

Once Upon A Time, I used to cite the "Roth Rule":

50% of all electronic failures are due to a mechanical/connector breakdown, 50% is everything else.

In the meantime, Bill Ruck, a good friend of mine with many years as a radio broadcast as well as recording engineer in the Bay Area, begs to differ with MY rule. Henceforth, the Roth-Ruck Rule, with tongue planted only slightly-in-cheek:

"90% of all electronics fail due to connections/connectors...10% is anything else."

Sliding wipers on the resistor "tracks" inside of a pot fit into that rule.....I'd say "the Pot is Shot"!

Bri

audioez 2nd August 2005 05:38 PM

Quote:

Originally Posted by brianroth
Once Upon A Time, I used to cite the "Roth Rule":

50% of all electronic failures are due to a mechanical/connector breakdown, 50% is everything else.

In the meantime, Bill Ruck, a good friend of mine with many years as a radio broadcast as well as recording engineer in the Bay Area, begs to differ with MY rule. Henceforth, the Roth-Ruck Rule, with tongue planted only slightly-in-cheek:

"90% of all electronics fail due to connections/connectors...10% is anything else."

Sliding wipers on the resistor "tracks" inside of a pot fit into that rule.....I'd say "the Pot is Shot"!

Bri

sounds good brian!! although I was waiting for the 99.44% to be thrown out there as well!!!