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Author Topic: Metering gone mad  (Read 3995 times)

StefanNowak

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Metering gone mad
« on: August 23, 2012, 09:32:59 AM »
Hi guys,

Tech was in today and this started happening... it happens in all modes, VCA, PPM and VCA to meters. It is global.

Any thoughts?

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Matt Sartori

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Re: Metering gone mad
« Reply #1 on: August 25, 2012, 07:43:09 AM »
Stefan this might be the controller card (or meter distribution card) on the back of the console.
I would start by recapping it. and also I would recap the PSU that provides the 250VDC to the meters: some console have it built in (like mine) others have a separate chassis for that

BE VERY CAREFUL 250VDC CAN BE LETHAL

Better ask your tech to do it...

Let us know how you get on with it!

Mattia.
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StefanNowak

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Re: Metering gone mad
« Reply #2 on: August 25, 2012, 08:12:47 AM »
Hi Mattia,

Yes my tech has taken away the 2 small cards off the meter distro board. He'll inspect and repair them, no rocket science going on there apparently.

Thanks,
Stef.
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StefanNowak

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Re: Metering gone mad
« Reply #3 on: September 04, 2012, 09:45:45 AM »
Just following this up..

Meters are now fixed. It was the 2 transistors on the CF82E75 board.

All good.

Stef.
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Matt Sartori

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Re: Metering gone mad
« Reply #4 on: September 04, 2012, 11:22:42 AM »
GOOD news!!
is there any chance you could tell us which transistors they were by referring to diagram?
so next time something like this happens we will already know what to look for!
thank you.

Mattia.
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StefanNowak

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Re: Metering gone mad
« Reply #5 on: September 04, 2012, 11:28:25 AM »
Here's a pic of the board.

It's the 2 transistors that are surrounded by the heat sinks. On the right hand side of the pic... (Actually the top left of the card as the pic is upside down)

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Matt Sartori

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Re: Metering gone mad
« Reply #6 on: September 04, 2012, 01:43:03 PM »
ok they look like regulators or something, one looks like TR3 but I can't see the other....can you confirm what it is?
 I see if I have a schematic and then post it for future references.

Mattia.
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sintech

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Re: Metering gone mad
« Reply #7 on: September 04, 2012, 03:11:52 PM »
TR4 and TR5 maybe?

« Last Edit: September 04, 2012, 03:15:21 PM by sintech »
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Matt Sartori

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Re: Metering gone mad
« Reply #8 on: September 04, 2012, 10:18:27 PM »
interesting...I thought the plasmas were getting the 263 volts only..what is that 83V doing? is that a IDLE bias or something like that?

Mattia.
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billythekid

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Re: Metering gone mad
« Reply #9 on: November 23, 2016, 08:31:56 PM »
Hey guys, so following-up on this thread as I'm having a similar issue. Kinda a newbie when it comes to electrical engineering. Do you think as a newbie, I would be able to remove and replace TR 4 & 5? Could anyone point me in the correct direction for ordering replacement transistors? I am aware of the high voltage and so any feed back from you guys would be appreciated!
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StarF666

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Re: Metering gone mad
« Reply #10 on: November 24, 2016, 09:14:01 AM »
That are two different (PNP/NPN) transistors. TR4 is a TIP152, TR5 is a TIP127. TIP127 seems to be a bit harder to find. rs-online.com seems to have them. Check the common distributors in your country. You should only change them yourself if you know what you're doing or you could do harm to your console or even worse to yourself. The plasma stuff is nothing to be kidding with.

Greetings,
Martin
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cleartrack

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Re: Metering gone mad
« Reply #11 on: January 21, 2021, 11:21:09 AM »

Just wanted to post this updated schematic on the 75 card. TR4 and TR5 are both TIP150 in the later revisions.

The HA2-2645-5 op-amps have been troublesome for me and I recommend having these on hand. When they start to go the meters can start to have dim or missing segments. I strongly recommend anyone who plans to have these meters working to grab the hard to find parts like these so you can keep your meters going for years.
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MarconeMusic

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Re: Metering gone mad
« Reply #12 on: February 14, 2021, 03:32:55 PM »
Heya, @cleartrack, Could you send me your updated drawing, i cant open it(expand it) on this forum.
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MarconeMusic

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Re: Metering gone mad
« Reply #13 on: February 14, 2021, 03:40:02 PM »
Never mind, I figued it out. Had to right click and open in another window and then it shows up properly, wasnt 'clickable'

:)
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