4 Jun
2001
4 Jun
'01
7:55 a.m.
On Mon, 4 Jun 2001, Edwin P. Groot wrote:
Well, I plugged in the boards and powered up the
computer, and
promptly powered it down after a few loud pops - D'Oh! Nothing was
displayed on my teminal connected to the console serial line. The affected
boards are the CPU board and a serial board - some tantalum capacitors
blew. I'm assuming they're tantalum caps- they're not electrolytic
can-style, or ceramic disc-style, but look like a gob of shiny blue acrylic
paint on two leads. The board marks which lead is +.
Are these tantalum caps common enough to buy at the local electronics
shop? We've got Radio Shack, but I heard they are overpriced. The caps to
be replaced were in the uF range.
BTW this is a complete system and the cards are arranged (from low
slot # to high slot #): CPU, RAM, FD controller, Serial/Parallel,
Terminator. Will check with documentation that RAM and ROM banks, and I/O
is configured right once I get the boards fixed.
I had this experience before with a Sol-20. Aside from being loud and
smelly, the tantalum caps exploding really shouldn't hinder the operation
of the system. Tantalum caps on older systems like S-100's that haven't
been powered up in some time are prone to exploding.
If you have a problem it's most likely related to some other failure.
Perhaps you should check to make sure you have matching settings on
your serial port and terminal. Also, make sure your cable is the right
kind (straight through...NOT a "null-modem" cable).
Also, maybe your system is expecting a boot disk to do anything useful.
Did you notice if your drives are spinning when you fire it up?
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org