andre tchmil

Eventide H3000,back on duty,mod for analog bypass ?
« on: November 24, 2007, 03:59:47 PM »
Hi all,
I have a blackface H3000 here.
Everything works just fine, except for the large LCD display backligh which is very weak.
I can adjust the brightness with the "Function" parameter, but it's still to dimmed.
Anyone had to repair something like this before ?

thanks


Larrchild

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #1 on: November 24, 2007, 04:54:30 PM »
There is a .1uf cap, I believe that goes bad in the display backlight circuit board.
Look for a largish one.

sintech

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #2 on: November 24, 2007, 06:39:31 PM »
Hi Andre,

I've always wondered how to adjust the screen brightness on the H3000 :) any chance you could explain the method for me?

many thanks in advance.

andre tchmil

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #3 on: November 24, 2007, 07:08:10 PM »
in function mode, spin the dial wheel.

andre tchmil

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #4 on: November 24, 2007, 07:10:36 PM »
Hi Larrchild.
Thanks for the help; but I don't see any cap around the LCD.  :?
I Measure around 5V at the backlight.

Yes, I did the ROM reset, etc.

Larrchild

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #5 on: November 24, 2007, 07:23:45 PM »
They use a small switching supply to generate the backlight voltage.
The cap is part of the oscillator. Look for a small ferrite core transformer. It's near there.

The voltage on the backlight is much higher than 5v.

SSLtech

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #6 on: November 24, 2007, 10:41:09 PM »
Quote from: "andre tchmil"
in function mode, spin the dial wheel.

It's actually the contrast, not the brightness, IIRC.

Keith
"A waist is a terrible thing to mind"
Quote from: PRR
Ah, but that was 1999; we don't party like that any more.

Bookkeeper

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #7 on: November 24, 2007, 10:43:32 PM »
It is Optrex DMC40267-yu-neg display (U1). Back light is connect to pin nr. 15 (ground) and 16 (resistor R23 5R6/1W). This resistor is directly coupled to +5V DC. On pin 15 should be 3.9V/0.2A.
LCD contrast signal is feed from U3 (74HC174) to Optrex pin nr. 3 (VO).
It probably means, you can'n change the backlight, but you can change the contrast of the display. I guess...
Milos Fiser

andre tchmil

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #8 on: November 25, 2007, 04:25:46 AM »
Quote from: "SSLtech"
Quote from: "andre tchmil"
in function mode, spin the dial wheel.

It's actually the contrast, not the brightness, IIRC.

Keith


You're correct. It's the contrast adjustment, which is perfectly working on my unit.

sintech

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #9 on: November 25, 2007, 05:29:37 AM »
Quote from: "andre tchmil"
Quote from: "SSLtech"
Quote from: "andre tchmil"
in function mode, spin the dial wheel.

It's actually the contrast, not the brightness, IIRC.

Keith


You're correct. It's the contrast adjustment, which is perfectly working on my unit.


This function doesn't work on my unit.. I guess it's stuck on full (grey face SE model)


andre tchmil

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #10 on: November 25, 2007, 01:43:10 PM »
Problem solved.
Replaced the Backlight.

andre tchmil

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #11 on: November 26, 2007, 12:56:09 PM »
While the baby is open,
would it be possible to bypass the analog in/outs and go direct via spidf or aes ?




in a simple way . :oops:

SSLtech

Eventide H3000,back on duty,mod for analog bypass ?
« Reply #12 on: November 26, 2007, 03:53:21 PM »
Nope.

Sorry... That's quite a big deal. Not least clock-stripping and then clocking the unit from that.

Just stay analog... you know it makes sense! :wink:

Keith
"A waist is a terrible thing to mind"
Quote from: PRR
Ah, but that was 1999; we don't party like that any more.


 

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