cunniff@hpfclq.HP.COM (Ross Cunniff) (11/18/87)
Well, I finally traded in my 1000 for a 2000 (buying the 1000 back), and
am pretty happy with the 2000. However, there is one annoying problem
with the 2000: if I power-on the 2000 when the motherboard temperature
is below about 70 degrees F (21 degrees C, for those of you living in the
20th century), the screen remains dark (no diagnostic colors, NOTHING)
until I hit the ctrl-amiga-amiga. It then proceeds to boot just fine.
If I apply a blow drier on low heat to the motherboard (raising the
temperature to, oh, 80 degrees or so) the power-on sequence works properly.
Now, since it is winter in Colorado, the temperature in my house is
generally below 70 degrees F, and so I ALWAYS have to ctrl-amiga-amiga
to boot. This is perplexing. I guess I will take it back to the
dealer :-(, but I wanted to solicit net.opinions first. Is this a known
problem with the 2000, or do I have a cold solder joint or something
somewhere?
P.S. Thanks to everybody who responded to my question about disemboweling
the 1010 disk drive and putting it in my 2000 - since I bought my 1000
back, the point is moot.
Ross Cunniff
Hewlett-Packard System Software Operation
...{hplabs,ucbvax}!hpda!cunniff
cunniff%hpda@hplabs.ARPAstever@videovax.Tek.COM (Steven E. Rice, P.E.) (11/24/87)
In article <4230008@hpfclq.HP.COM>, Ross Cunniff (cunniff@hpfclq.HP.COM) writes: > . . . if I power-on the 2000 when the motherboard temperature > is below about 70 degrees F (21 degrees C, for those of you living in the > 20th century), the screen remains dark (no diagnostic colors, NOTHING) > until I hit the ctrl-amiga-amiga. It then proceeds to boot just fine. > If I apply a blow drier on low heat to the motherboard (raising the > temperature to, oh, 80 degrees or so) the power-on sequence works properly. > . . . Is this a known > problem with the 2000, or do I have a cold solder joint or something > somewhere? A cold solder joint is a reasonable surmise. Also look for ICs which have one pin bent over (just touching the socket). This problem will probably yield to a close visual inspection. Steve Rice ----------------------------------------------------------------------------- new: stever@videovax.tv.Tek.com old: {decvax | hplabs | ihnp4 | uw-beaver}!tektronix!videovax!stever
grr@cbmvax.UUCP (George Robbins) (12/28/87)
In article <4230008@hpfclq.HP.COM> cunniff@hpfclq.HP.COM (Ross Cunniff) writes: > Well, I finally traded in my 1000 for a 2000 (buying the 1000 back), and > am pretty happy with the 2000. However, there is one annoying problem > with the 2000: if I power-on the 2000 when the motherboard temperature > is below about 70 degrees F (21 degrees C, for those of you living in the > 20th century), the screen remains dark (no diagnostic colors, NOTHING) > until I hit the ctrl-amiga-amiga. It then proceeds to boot just fine. > If I apply a blow drier on low heat to the motherboard (raising the > temperature to, oh, 80 degrees or so) the power-on sequence works properly. Well, I'd suspect something in the power-up reset circuitry is broken, probably either an out-of-spec or incorrect value part in the area of U805, the LM339/2901 that handles the reset chores. Might as well get it fixed, since there's a 50/50 chance it will get worse instead of better. -- George Robbins - now working for, uucp: {uunet|ihnp4|rutgers}!cbmvax!grr but no way officially representing arpa: cbmvax!grr@uunet.uu.net Commodore, Engineering Department fone: 215-431-9255 (only by moonlite)