As a tech, this can't be preached enough:
Unseat, unplug and disconnect everything possible - clean them - then
reconnect and test. Don't just jiggle or wiggle. Heat, corrosion and
vibration can cause a lot of strange things to happen over the years.
If this doesn't work, then it's time to tap... but first visually
inspect for bad solder joints. Then take the eraser end of a pencil and
tap all over the board while you have it powered up to see if anything
happens. This is a technique of finding bad solder connections.
It's unusual for a small section of an EPROM to fail and cause symptoms
like yours. It's usually all or nothing, therefore I'm suspicious of a
connection being compromised somewhere.
As far as copying chips is concerned:
Yamaha is no longer making any money on this unit which they obsoleted
years ago. Making copies to repair or restore existing units is like a
machinist making copies of parts of old cars when the factory no longer
supplies them.
∗Ed Edwards∗
><> <>< <>< ><>
http://www.ezekielswheel.comhttp://www.untiedmusic.com/ezekielhttp://mysite.verizon.net/vze29bq6 jesse meyer wrote:
> Thanks for the info. I took her apart. I removed that
> board and tried to push the wires back in. The ones to
> the volume connector moved in more, but the connector
> for the scene buttons are in metal teeth, and aren't
> able to be pushed in. Besides, they look pretty good.
> Still no luck. She's still open if anyone has any more
> suggestions.
>
>
> --- pcbye111 <pcbye@...> wrote:
>
>
>>> Thanks, I tried the diagnostic. The scene lights
>>>
>> don't
>>
>>> turn on and the buttons don't respond to the
>>>
>> keypress.
>>
>>> I tried the factory resest again and still
>>>
>> nothing. I
>>
>>> suppose my next stop is surgery. Anything I should
>>> know before I go poking around in there?
>>>
>>>
>> Before you start, you may want to pick up a NEW
>> CR2450 Battery and
>> replace it while your at it.
>>
>> I've got one open now. First off. Get some damp
>> bath towels to lay
>> the synth upside down on. A quick and diry way to
>> get one damp is to
>> throw a clean bath towel in the dryer and toss in a
>> clean WET wash
>> cloth and tumble for a few minutes.
>>
>> Work in bare feet on a wood floor -- no socks
>> anyway.
>>
>> Pull the volume knob stright up and off. Lay the
>> Synth down with the
>> back of the facing you, take the the two dozen or so
>> screws on the
>> bottom and remove the cover.
>>
>> The circuit board you are looking for will be on
>> your far left close
>> to you. Remove the four screws holding down and
>> carfully wiggle it
>> up and out. Put a hand under to push a little on
>> the volume control
>> shaft. Be carefull as the LED's need to come up out
>> of their holes.
>>
>> Flip it over. There is one connector, and a punch
>> down block. It
>> looks like it is the punch down block where the
>> connections could be
>> loose. If things look OK, take a pen knife or use
>> the BACK edge of a
>> razor knife and gently press the wires into the
>> connector notches.
>>
>> This may do it. While your at it, go over all of
>> the accessable
>> screws and give them a twist if loose. Many are the
>> ground rail for
>> the PC boards.
>>
>> If that does not do it, those leads lead to a Relay
>> Board under the
>> Main System board. Wires could be loose there on a
>> similar
>> connector, or there could be bad relays -- not too
>> likely. Still,
>> most likely a loose connector. Getting under the
>> system board is a
>> bigger job. Go slowely and don't drop any tools on
>> any thing.
>>
>> Good Luck...............
>>
>> Peter
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
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