Author Topic: No NEC Blues  (Read 875 times)

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Offline HelmanfrowTopic starter

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No NEC Blues
« on: July 09, 2020, 08:05:04 pm »
I have a Sony GP5 guitar effects processor from the early 2000's which is no longer passing signal.

One one clear symptom is that the front LCD screen lights up but displays no characters.
Another is a loud, high-pitched whine which sounds like it's coming from a component labeled NEL-D32-46. I've looked it up and it appears to be a NEC voltage inverter for the LCD panel. Coincidence? I think not.

I can't be certain that this component is the reason for the general failure but it seems like a good place to start so I figure it's worth swapping out.
Problem is that the component seems to have been discontinued ages ago and I don't know how to track down NOS or pin-equivalent replacements.

Anyone know where I can find these?
« Last Edit: July 09, 2020, 08:40:23 pm by Helmanfrow »
 

Offline Renate

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Re: No NEC Blues
« Reply #1 on: July 09, 2020, 08:12:23 pm »
Is that thing dragging down the +5V?
That's the first thing that I'd check.
Does this box pass audio by default when turned on?
I'd just remove the inverter and see if the audio works.
 

Offline themadhippy

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Re: No NEC Blues
« Reply #2 on: July 09, 2020, 08:21:55 pm »
Quote
NEL-243-46
do you meen NEL-D32-46?
not cheap https://www.radwell.co.uk/en-GB/Buy/NEC/NEC/NEL-D32-46/?redirect=true
 

Offline HelmanfrowTopic starter

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Re: No NEC Blues
« Reply #3 on: July 09, 2020, 08:39:58 pm »
do you meen NEL-D32-46?

Yes, that was a typo; corrected.

not cheap https://www.radwell.co.uk/en-GB/Buy/NEC/NEC/NEL-D32-46/?redirect=true
Yeah, I saw that listing and was hoping it was not representative of the if-you-know-where-to-look rate.
« Last Edit: July 09, 2020, 08:47:58 pm by Helmanfrow »
 

Offline HelmanfrowTopic starter

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Re: No NEC Blues
« Reply #4 on: July 09, 2020, 08:47:17 pm »
Is that thing dragging down the +5V?
That's the first thing that I'd check.
Does this box pass audio by default when turned on?
I'd just remove the inverter and see if the audio works.

I'll locate and check the 5v rail and report back. I just need to order a new DMM (Topic of my next post).
It's been a lo-o-ong time since I've used this thing so I don't remember how it operates nominally, but it very likely would be passing signal immediately upon booting up.
 

Offline Renate

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Re: No NEC Blues
« Reply #5 on: July 09, 2020, 09:53:47 pm »
Oh, and check the backup battery there.
If it's dead-dead it could be killing everything too.
 

Offline HelmanfrowTopic starter

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Re: No NEC Blues
« Reply #6 on: July 09, 2020, 11:55:19 pm »
Oh, and check the backup battery there.
If it's dead-dead it could be killing everything too.

Yeah... the battery is tack-welded in place :palm:.
I'll need to snip it out and affix a button cell holder.
 


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