Not having
seen inside a 16500, I don't know.
I have extraced the faulty LED (you can do this without removing the
housing
from the PCB, thankfully. I didn't fancy
having to desolder all
21 X-axis LEDs). It's a flat transparent package with a lens 'bubble' on
the output
side. I think it's commonly called a
'side viewing' package.
Yest those are the same package.
I am not suprised...
I've measured the physical dimensions of the old LED and noted its
polarity, and I hope that the ones now avaialbe are the same. I will
search the catalogues again.
Incidnetally, I dugh out my 'battered' HP150. This was included when I
bought the 'good' machine as a source of spares. I extracted the
touchscreen PCB and connected it to the tester. About 5 beams were
blocked, all in the X direction. So I cleaned all the IR lEDs along the
bottom of the hole. tried again, _all_ beams good.
That machines (the batteresd one) passes the self-tests with no problems.
Always the way, isn't it :-). No, I am not tempted to swap bits between
them, well mot unless I really can't get a good IR LED to repair the
other touchscreen.
As you
may know I updated my 16500A to a 16500C version with a upgrade
kit from Agilent.
Upgrading included changing the touchscreen PCB, so I've an A-version
which I don't use or maybe one day will part out.
Why do you chnage the touchscreen PCB? Is the new one a higher resolution
or
something?
When updating you get a new front which includes the touchscreen parts..
Oh right... Are tyhe 2 touchscreen PCBs the same? If not, what is the
difference? If they are the saem, why didn't the upgrade get you to move
the old PCB to the new front paneL?
Do you happen to knwo anything abot uthe itnerface on these
touchscreends? The HP150 (original, 9" CRT) has a custom interface
consisitng of a clock line, sync line and data line, on a 10 pin (2*5)
header plug. The touchscreen PCB contains all standard chips, mostly
4000-series CMOS.
The HP150-II has an HP-HIL interfaced touchscreen (it's the same unit
that fits some of the monitors used with HP9000s). The interface is no a
9 pin (IIRC) SIL connector. Not suprisingly there's a microcotnroller (40
pins, I think it's a TMS7000 series) on the PCB.
I'd rather
have a sourve of new speres than have to depend on what I can
raid
from old boards.
Yes I agree, but sometimes ...
Sure, and if I can't find a suitable replacement at Farnell or
somwewhere, I may get back to you. But I don't think it's going to be too
difficult to find something that will work.
-tony
