Ideas for you. If you are out of warranty and brave. ;-)
Your reliability issues could easily be linked to temperature changes or
movement of a loose/untrustworthy connection. If it was fine before the
KDFX went in, then that narrows the investigation. I would start by
investigating the connections from the KDFX unit to the original power
cabling. Replace the crimps with chocolate block.
BTW Simply disassembling the unit and reassembling it reseating all the
connectors could solve the problem. The fact it is intermittent may point
to this kind of fault. When you reassemble, tidy your cabling aesthetically
and tape what you can to the case or other cables. Physically remove and
reseat each connector in turn. Again, simple tidiness may solve the
problem. There are also number of foil shielded connections, and earthing
points inside. You may find one of these has been disturbed and simply
needs reseating, or reinsulating.
If you want to solve it another way, disconnect the peripheral devices one
at a time - eg. floppy, i/o on the rear, etc. The unit will still work, but
there will be some devices that fail the tests on power up. If you can get
it to stay stable when you you switch it on, you can narrow the fault to a
particular peripheral. Be prepared to power the unit up in pieces to
achieve this. Only disconnect one device at a time.
Be safe, keep earthed, and get some help when removing and inverting the
main panel. Two X stands of adjustable height is perfect for this job, as
you can get right underneath. You'll need some foam or other blocks to
avoid the switches getting crushed when the panel is inverted. Needless to
say put it in a room where it won't be disturbed as it could take a couple
If this sounds terrifying, just remember, it's a machine. A Kurzweil is NOT
made out of pricless 18th century crystal - it's aluminium, steel, old pcbs
and wires. If you are happy to pull PCI boards from a PC and understand not
to touch the connectors unnecessarily, you will be FINE. This is just a bit
bigger and more awkward - and devoid of any kind of internal standards...
The most awkward part about the KDFX install is checking the voltage and
adjusting the pot to settle it. You could do worse than recheck this while
you're in there. I would say this is the bit that makes the KDFX install
the preserve of experienced engineers - but surely you must know someone
with a voltage meter and electronics knowledge who could help you at this
Ensure you remember to use the right type of screwdriver, to avoid
destroying the screws.
with kind regards
Studio 9 Ltd. UK
Behalf Of Dr. David Walker
Sent: 01 May 2006 19:05
To: Tyler Steel
Subject: Re: [KL] KDFX install inToronto
Thanks for the reply. I don't have a HD in my K2500 but Doctronics told
me that there was an 'unexplainable power drain' that caused the display
problem. Mine doesn't settle down even after several hours, but I'm glad
to hear that yours does. I've tried leaving mine 24/7 to see if it will
stabilize but it still acts up. At this point I assume I just have to
live with it.
Tyler Steel wrote:
> I used Doctronics a few years ago myself for my KDFX install, he gave me a
> little break on the price as well and completed it in a timely fashion.
> Who ever you use to repair/install, make sure they have credentials and
> they offer a warranty/guarantee and have worked on Kurzweils in the past.
> Dr. Walker, I too have my LCD contrast going from light to dark, which
> seemed to happen after the KDFX install. I did manage to contact him
> away and he mentioned that because I had an internal HD as well as the
> it would drain power. Because my internal HD is an old SCSI (3 amp), he
> mainly blamed that as the root of the problem.
> After 30 minutes or 1 hour, the LCD screen will settle to a single
> point for me.
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