24 Oct
2011
24 Oct
'11
1:42 p.m.
OK, I still don't have an answer to the question I asked: has anyone
here actually done this sort of work on a HP 9845? I opened up the
monitor, but the part number for the CRT wasn't in evidence. Given the
orientation of the tube, I think it's going to take major disassembly to
find that, to see if I can get a reasonable replacement if that's the
A lot of HP machines make it easy to get the CRT out (the 9836C is
particualrly nice in this respect!). I have the 9845B with the enhanced
mono monitor and from what I remmember, you take the top off the monitor
and the top shield under it, then slide the front bezel up and out
(disconnect the function key cable), take out all the plug-in PCBs
(including the heatsink unit), Unplug the anode cap and base conenctor,
put the thing face up and take out the CRT moutings.
Alas I have no idea how the 'simple' monitor goes together.
route I choose to go. If possible, I'd like to
have my action plan in
place before I tear it down to bare bones, so I can get the job done and
reassemble things before I forget where they go.
I've been playing with other aspects of the device and it's all sorts
of fun. I did some simple graphing, which is delightfully
straightforward. Something I read suggested an experiment, and I
discovered that it is in fact possible to make changes to
a program *while it is running." For instance, I did a simple PRINT
"HELLO" loop and while it was running changed the line to PRINT
"GOODBYE". The output promptly changed when I stored the new line. I
I beleive this was known as 'live keyboard mode' and is very nice. Very
few other machines let you do things like that.
also learned that the capstan rollers in the tape
drives are,
predictably, mush, and I have a DC100 tape cartridge to clean out. -- Ian
They're the same drives (exaclty) as are used in the 9815 and 9825
machines, so looking at repair methods for those might help.
-tony