19 Jan
2023
19 Jan
'23
9:01 p.m.
On Jan 19, 2023, at 2:46 PM, David Gesswein via cctalk
<cctalk(a)classiccmp.org> wrote:
On Wed, Jan 18, 2023 at 12:42:26PM -0600, Jon Elson wrote:
Hard to know what the sensor wants given that it isn't described in any DEC documents
I could find. The schematics do mention that the light bulb runs on +5 volts, which
suggests that indeed it might be below its rated voltage.
If the sensors want IR you could try an IR LED. Or a white LED on the theory that
it's a broadband light source...
paul
On 1/17/23 21:18, Marc Howard via cctalk wrote:
Originally discussing RK05 head position sensor bulb. I have replaced it. The
offical part to replace it isn't available. You can open it up and put in
a new bulb. I wasn't able to quickly find what bulb I used a number of
years ago but if someone really needs to know I can dig further. One of the
small ones with wires. It doesn't use bulb with base. LED didn't work. I
think sensor is IR. Does anyone know if that light bulb is still
available? I’m not sure what
the response of that photo sensor is and that might rule out using a led
replacement. The fact that the bulb is almost certainty driven below the
rated voltage also complicates matters.
If you need JUST ONE badly enough, you can probably keep it going. Likely
an LED could be used as a substitute. But, a roughly equivalent bulb with
the wrong base could likely be found and hacked.