spike@wasp.eng.ufl.edu (Spike) (02/21/91)
Help! I have a dead Turbo Sport, ZTC-3034-EB type. When I turn it on, it clicks, and the screen flickers, then nothing. The hard drive doesn't spin up, the flpy drive doesn't access, and yet the LEDs give me the indication that it thinks that it's on! So now I turn it off, and it appears to go through a normal power down. My first move was to load the power supply down to the specified power requirements. (this was done isolated from the rest of the machine) The power supply failed in grand fashon. I replaced the power supply and it didn't fix the problem, it failed in the same way. Now after a quick and dirty look at the diagrams it looks to me that the power uo logic is in the I/O board. I replaced that to no avail. So now the only thing left in the power system is this little board called the Power logic board. This is a small board that the external power supply and the battery both plug into. It has a few relays on it and sends power to the power supply for rectification. So I change this board. NOTHING. So my question to the net is: Has anybody seen this before? Can the mylar cpu cable cause it? cpu? does anybody have any suggestions for my next move??? Thanks in advance. Ken Gage...Care taker of Zenith Heaven, University of Florida.
pel@ctron.com (Paul Leclerc) (02/22/91)
In article <1991Feb21.152120.19737@eng.ufl.edu> spike@wasp.eng.ufl.edu (Spike) writes:
Help! I have a dead Turbo Sport, ZTC-3034-EB type. When I turn
it on, it clicks, and the screen flickers, then nothing. The hard
drive doesn't spin up, the flpy drive doesn't access, and yet the
LEDs give me the indication that it thinks that it's on! So now I
turn it off, and it appears to go through a normal power down.
My first move was to load the power supply down to the specified
power requirements. (this was done isolated from the rest of the
machine) The power supply failed in grand fashon. I replaced the
power supply and it didn't fix the problem, it failed in the same
way.
Now after a quick and dirty look at the diagrams it looks to me
that the power uo logic is in the I/O board. I replaced that to
no avail.
So now the only thing left in the power system is this little board
called the Power logic board. This is a small board that the external
power supply and the battery both plug into. It has a few relays on
it and sends power to the power supply for rectification. So I change
this board. NOTHING.
So my question to the net is: Has anybody seen this before?
Can the mylar cpu cable cause it? cpu? does anybody have any suggestions
for my next move???
Yup.. I've seen something like this. I thought it was my hard disk
because shortly before it started doing this, my HD was making very
strange noises. I opened it up and unplugged the hard disk. I was
able to boot off of floppy after using the SETUP to say that I had no
HD. It worked great as a 1 floppy system until I could afford to get
a new HD. All is fine now.
This was in a SuperSport 286 with 40 meg.
Paul L.
--
pel@ctron.com #include <disclaimer>
Cabletron Systems Inc.rocco@nstar.rn.com (Rocco Calderone) (02/23/91)
The problem you have is called STICTION, believe or not, it it the heads fo the Hard drive sticking to the platter. Check and see if the HD drive is a Connor model CP-334 and the date code is before 8933. Zenith had know known problems with HD before that date. -- Rocco Calderone NSTAR conferencing site 219-289-0287 internet: rocco@nstar.rn.com 1300 newsgroups - 8 inbound lines uucp: ..!uunet!nstar.rn.com!rocco 99 file areas - 4300 megabytes --- backbone news & mail feeds available - contact larry@nstar.rn.com ---
spike@wasp.eng.ufl.edu (Spike) (02/24/91)
Thanks for the response Paul L. As a Zenith Tech I've seen the problem you described a few times. But I think this problem lies in the Turbo Sport Arena, I'm not saying your suggestion isn't valid, in fact it was the very first thing I did. It seems the mylar I/O-CPU "flex board" can be the cause of a lot of problems. I'm not in a hurry to put any more parts on order, which is why I sought help from the masses hoping somebody had seen this particular mind bender. take care and thanks again. Ken Gage.....Care taker of Zenith Heaven, University of Florida.