30 Jun
2004
30 Jun
'04
1:35 a.m.
In message <40E28759.F80CAB32(a)cs.ubc.ca>
Brent Hilpert <hilpert(a)cs.ubc.ca> wrote:
When I returned, the other hardware guy informed me
the PROM burner was
fixed.
He had taken a screwdriver and made a minor tweak to the 5 volt logic
supply level.
Lesson #1: Before doing ANYTHING else, get a multimeter and check ALL
the
power supply voltages. If the power supply reads good, go get the
schematics and an oscilloscope :)
I think I've still got a power supply somewhere that has a flaky 5V
regulator. Sometimes the regulator starts up fine, then runs for hours. Other
times it just sits there dead - strangely enough, drumming one's fingers on
the casing usually gets the regulator to start. I'll fix the dry joint on the
PCB when my Farnell L30B bench PSU dies. Speaking of which, does anyone have
a service manual for the Farnell L30B power supply?
One of these days, I'll build a custom power supply. At the very least, the
L30B needs its switches, one of the meters and all of the potentiometers
replacing. Oh, and I need to find two self-tapping (?) screws to hold the
side panels on. Bleagh.
Later.
--
Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem(a)dsl.pipex.com | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.dsl.pipex.com/ | 48xCD, ARCINv6c IDE, SCSI
... Growing old is mandatory; growing up is optional!!