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» Film-Tech Forum   » Operations   » Digital Cinema Forum   » Dolby DSP-100 (Fan 3 Error)

   
Author Topic: Dolby DSP-100 (Fan 3 Error)
Kerry Fleming
Film Handler

Posts: 42
From: Boynton Beach, FL, USA
Registered: Mar 2003


 - posted 01-31-2018 05:32 PM      Profile for Kerry Fleming   Author's Homepage   Email Kerry Fleming   Send New Private Message       Edit/Delete Post 
I know that this equipment has three fans built into it.
Two in the back. Which are field serviceable.
And one in the front which is not.
There is a hidden diagnostics LED panel under the front cover.
One of the LEDs is marked Inner. Another Outer.
In this case the Inner LED is illuminated RED.
The System Log is indicating a Fan3 Error.
This is a Cautionary Alert!!
Has anyone run into this Alert before?
Can anyone advise me what the respective fan numbers are?
Dolby no longer supports this equipment as of 2014.
Legacy support was given to Venture Manufacturing.
They have no parts or service available any longer.
Finding parts for the DSP-100 is proving to be challenging!

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Stephan Shelley
Jedi Master Film Handler

Posts: 544
From: castro valley, CA, usa
Registered: Nov 2014


 - posted 01-31-2018 06:25 PM      Profile for Stephan Shelley   Email Stephan Shelley   Send New Private Message       Edit/Delete Post 
You can carefully open it up. Just make sure not to disturb the video decoder card. Do not remove it. You should be able to source the fans on the internet.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 11778
From: Annapolis, MD
Registered: Dec 1999


 - posted 01-31-2018 06:32 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
I believe the "Inner" is the one facing in and the outer is the one facing out (They are merely two fans stacked upon one another.

The spec I have on the fan is:

Comair-Rotron CR0812MB-A70GL(T) 12VDC 80mm x 80mm x 25mm.

It is a simple 2-wire fan, nothing proprietary. You will need to clip the old fan wires off the old connector and solder the new one onto it (have heatshrink available too). It isn't such a bad job. Just note, the DSP100 cabinet typically has security screws (torx security (with the high-point peg)).

I've found that the DSS100 is MUCH more likely to loose a fan (they tend to gum up and just stop turning or slow down). For those, it is a pain due to where you need to get to the nuts. Using some large/long "bent" needle nose pliers can be a life saver.

BTW...there is a document on changing the DSP100 fans. A call to Dolby Tech Support might score you with it though mostly common sense is sufficient. Remember, there are things in there that don't react well to people poking and prodding.

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Carsten Kurz
Film God

Posts: 3309
From: Cologne, NRW, Germany
Registered: Aug 2009


 - posted 02-01-2018 05:59 PM      Profile for Carsten Kurz   Email Carsten Kurz   Send New Private Message       Edit/Delete Post 
If it's two wire, does the dsp100 actually notice it is failing? Is there another sensor for actual flow?

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 11778
From: Annapolis, MD
Registered: Dec 1999


 - posted 02-01-2018 09:48 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
Strictly current in/out of range, I guess. But it is definitely just 2-wire. Note, the CRU rack mount frames that have those FAN LEDs...same thing.

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Kerry Fleming
Film Handler

Posts: 42
From: Boynton Beach, FL, USA
Registered: Mar 2003


 - posted 02-04-2018 10:20 AM      Profile for Kerry Fleming   Author's Homepage   Email Kerry Fleming   Send New Private Message       Edit/Delete Post 
Thank You for your replies!
Steve; I deciphered it as you did. Inner fan/Outer fan. Both on rear panel of DSP100. I had the fan replacement instructions from Dolby. And I have replaced the Inner Fan corresponding to the Inner LED illuminated. But, no joy! The Red LED remains. As does the Cautionary Fan 3 Error warning. Awaiting the arrival of another replacement fan. Figure I will go get the other one in back.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 11778
From: Annapolis, MD
Registered: Dec 1999


 - posted 02-04-2018 11:03 AM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
Since the plugs are right next to each other, did you try swapping the plugs to see if the problem moved? Maybe they were plugged in wrong.

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Greg Routenburg
Expert Film Handler

Posts: 135
From: Toronto, ON, Canada
Registered: May 2003


 - posted 02-06-2018 09:47 PM      Profile for Greg Routenburg   Email Greg Routenburg   Send New Private Message       Edit/Delete Post 
The DSP100 actually has 4 fans, two at the front and two at the back. When one fan fails, I replace all 4. The two at the back are very easy to change and Dolby has a Field Bulletin to walk you through it. The front fans were not deemed to be field serviceable by Dolby but it can be done if you're very careful. As mentioned previously, don't disturb the circuit boards in the unit during the procedure. If you're looking at the unit from the top down, they are in the front left corner of the unit, directly in front of the two power supplies. In order to remove them, you need to remove both power supplies, the right wall of the power supply bay and the power supply back plane. There are a couple of screws holding the sheet metal together near the front that I usually turn out with needle nosed pliers because you can't get at them with a screw driver with the circuit boards in place. There was a couple of different versions of the metal work and they each have their challenges to get at the fans. For that reason I can't really give a step by step explanation. You'll just have to wing it. The fans that I've used with great success are:

Sunon ME80251V2-000U-A99
Sunon ME60251V1-000U-A99

Both were readily available on Digi-Key when I last bought them.

I hope that helps.

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