Help me fix my DEQ2496 please...

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MikeHunt79

MikeHunt79

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Joined 2003
It was working fine until recently, and now just the display backlight (and the optical out led) comes on and it does not boot...

I'm guessing the first thing to do is check the voltages from the PSU, but if these check out to be ok what would be the next thing to do?

EDIT: Also, what's the VR1 pot for? Display contrast?

EDIT2: The PSU seems to be putting out the correct voltages, what else can I check?:smash:
 
MikeHunt79

MikeHunt79

Member
Joined 2003
rossl said:
the connector from the power supply to the cpu board is bad on some of these units.

pull off the connector at the cpu board and make sure the crimps are good.

that's the first thing I would do.
Click to expand...

Ok, I've done that. I also measured the voltages again this time from the CPU board, and they check out OK. I'll see if I can check the regulators on the CPU board also....
 
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FrankWW

Member
Joined 2004
DEQ 2496 not booting.

You may get lucky - simple fix.

The main circuit board can 'short' against the bottom of the case. I've seen two cases like this.

Before you do anything radical, turn on the machine, pick it up and twist it, see if it boots then.

Or, just slide a piece of thin cardboard - like used for greeting cards - between the board and the bottom. See what happens.
 
MikeHunt79

MikeHunt79

Member
Joined 2003
zanash said:
contact tenson on zerogain.com ....he mods these units and must know all the bad things that can happen .....

I've a deq 2496 but have only mildly worked over the units psu and its always worked fine ...
Click to expand...
Thanks, I'll get hold of him. Hopefully he will be able to tell me the most common things that stop the DEQ from booting up.
kepa1 said:
I know that the connectors from the Input/Output board to the mother board of the DCX2496 have flaws, so it might be the same on the DEQ.
To solve that, you could replace the flat cable or simply bend the male connectors to get a better contact.
Click to expand...
I've actually tried it with the IO board disconnected and it still doesn't boot. The cable it self seems ok tho.
FrankWW said:
DEQ 2496 not booting.

You may get lucky - simple fix.

The main circuit board can 'short' against the bottom of the case. I've seen two cases like this.

Before you do anything radical, turn on the machine, pick it up and twist it, see if it boots then.

Or, just slide a piece of thin cardboard - like used for greeting cards - between the board and the bottom. See what happens.
Click to expand...
I removed all the PCB's and covered the case in tape, apart from under the SMPS, as you can see here:

An externally hosted image should be here but it was not working when we last tested it.

MisterTwister said:
I remember mine didn't work without top case cover touching power supply's top metal screen. If I remember correctly I just bent that screen, so it has better contact with top case cover. it fixed the problem.
Click to expand...
That's weird, because mine has a plastic sheet on the top cover around the PSU area which looks like it's designed to insulate the top cover from the screen. Did you remove this plastic cover or did your not have this cover at all?
 
MikeHunt79

MikeHunt79

Member
Joined 2003
MisterTwister said:
I don't remember exactly. I need to open my unit.
You may check if it will work by shorting power supply's cage to the case, with screw driver.
Click to expand...
I tried shorting it with a screwdriver, still no boot.

I think it may possibly be the BIOS chip, 39SF040, I actually have an EEPROM programmer so I'm going to see if I can get a blank 39SF040 chip and flash the firmware to it. The only problem with this is that I'm not sure where I can get a firmware file from, Behringer have the updates for the DCX (as it's updatable with the RS232 cable), but none for the DEQ. :(

EDIT: Found the files on the Behringer site after all... All I need to do now is get hold of the blank EEPROM. :smash:
 
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suryadi5417

Member
Joined 2010
MikeHunt79 said:
Thanks, I'll get hold of him. Hopefully he will be able to tell me the most common things that stop the DEQ from booting up.

I've actually tried it with the IO board disconnected and it still doesn't boot. The cable it self seems ok tho.

I removed all the PCB's and covered the case in tape, apart from under the SMPS, as you can see here:

An externally hosted image should be here but it was not working when we last tested it.


That's weird, because mine has a plastic sheet on the top cover around the PSU area which looks like it's designed to insulate the top cover from the screen. Did you remove this plastic cover or did your not have this cover at all?
Click to expand...
repair the power supply unit or change it wit the one.......
 
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