[Coco] MicroSD Drive Pak Failure

[Gene Heskett]

On Tuesday 28 October 2014 08:04:19 Guillaume Major did opine
And Gene did reply:
> No, it dropped on a wooden floor. I will try to test the oscillator.
> I`m not sure how to do that thought.
> 
> Guillaume

That will probably need an oscilloscope with suitable bandwidth.  Turn the 
gain way up and just sniff around the crystals legs with the probe & you 
ought to see something besides a flat line. Touching a leg might kill it 
even with a 10x probe.

> ----- Original Message -----
> From: "Brian Blake"
> <random.rodder-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> Newsgroups:
> gmane.comp.hardware.tandy.coco
> To: "CoCoList for Color Computer Enthusiasts"
> <coco-uNHYcr1XS/wmlAP/+Wk3EA at public.gmane.org>
> Sent: Monday, October 27, 2014 4:51 PM
> Subject: Re: MicroSD Drive Pak Failure
> 
> > The oscillator might be the only component sensitive to shock - not
> > sure it would cause that problem. Another possibility is one of the
> > IC's took an ESD hit when you dropped it. Did it fall onto carpet?
> > 
> > On 10/27/2014 1:10 PM, Guillaume Major wrote:
> >> Hi guys,
> >> 
> >> I accidently dropped my MicroSD Drive Pak on the floor and it's not
> >> working anymore. When I turn on the coco, it displays the Disk Basic
> >> copyright, the Coconet version and hangs on the MicroSD Pak
> >> detection. I opened the cartridge and saw no apparent damage. I
> >> tried reseating the socketed chips to no avail. I suspect the
> >> uDrive module to be the problem. The power on led doesn't go on
> >> when I turn on the coco.
> >> 
> >> If I connect the GND and VCC pins to power up the uDrive module with
> >> an external 5 V DC source while the cartridge is unplugged, is the
> >> power on led supposed to go on?
> >> 
> >> Is there any other component in the drivepak that is sensitive to
> >> shocks? Eprom? Oscillator?
> >> 
> >> Thanks,
> >> Guillaume


Cheers, Gene Heskett
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