11 Aug 2006

Keeping the Emulator III alive - Part 2: Disabled outputs

A common problem with aging EIII's are non working stereo outputs. If you test the unit, all 16 individual outputs will work but not the stereo ouput.
This is due to a faulty relay switch on the output board. This relay switch will disable the stereo output when the machine is turned off or on to prevent a popping sound through the speakers.
The relay is labelled Aromat DS2YE-S-DC5V and is in a yellow casing.

Solution: Replace the relay switch or bypass it. When you bypass it you'll hear a small pop when the machine is turned off or on but it's nothing major that can destroy you speakers.

The relay switch is the yellow component:


Here's is an excerpt from the EIII Technical Manual showing the output board schematics. The relay switch is the component in the red circle:


Here's a picture of the relay switched being bypassed:


UPDATE 17.02.07:

Dr C., an experienced EIII technician informs me of the following:

The above diagnosis is wrong.

The +5V transits to the board to power the relay by the leftmost flat
cable. Sometimes, it becomes bad.

In order to repair it, make a joint with a piece of wire (yellow if
possible), from one of the yellow cables of the power connector (the one of
the cards cage) and pin 8 of IC3.

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4 Comments:

Blogger matrix said...

Where's the picture? : )

8:15 pm  
Blogger Jerry Langford said...

I had this problem too. I could hear the relay switching the audio off. I wasn't sure about byassing the relay, so I swapped the ribbon cable from the main outputs with one of the cables from the independant outputs. Solved the problem.

7:59 pm  
Blogger dvdborn said...

Jerry,

Thanks for the tip!

9:13 am  
Anonymous adrelaynyc said...

Always a great site, dvdborn!

Anyway, on a similar OUTPUT subject, does anybody know anything about when something goes wrong, forcing you to use the DISABLE OUTPUT parameter? I was getting a problem where 1 out of every 16 notes played sound slightly distorted and muffled, so looking at the display while successively hitting a single key, I deternined that voice "6" was the culprit. After disbling the output, problem solved, yet now my polyphony is shy one note of course! I infer from the mere existence of this parameter function that this may be a common problem.

Is it a bad op-amp or anything that would be user serviceable? And while I'm at it, I've heard of people replacing the output amps (I think) and remarking on the vast improvement in sound. Any help?

3:54 pm  

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