Fluke 287/289 IR Lead Detection Fault

Some of the Fluke meters that I have seen use an infrared beam to detect whether the test leads have been inserted into the ammeter inputs. Other users have reported problems with this circuit where the IR LED has come off the PCB. See here:
https://www.eevblog.com/forum/reviews/fluke-287-input-alert-diode-type-replacement/
https://www.eevblog.com/forum/beginners/my-fluke-289-displays-_warning-leads-connected-incorrectly_-after-the-case-open/
In my case the LED was not emitting any IR although it had the correct forward voltage drop for a 10mA current.
I used an old digital camera to look for IR coming out of the diode when I powered it from a 10mA current limited bench PSU. Note that many newer cameras, including phones have an IR filter and you cannot detect IR.
I identified that IR LED as:
Kingbright KP-2012F3C INFRARED EMITTER, 940 NM, 0805
I bought a pack of 5 from Farnell (2290432) for less than £1.
Be aware that the LED needs to be soldered flat to the PCB so that it fits correctly into the light guide in the front of the case. Also note that the probe lead detection only works with the PCB fitted fully into the case front.

Видео Fluke 287/289 IR Lead Detection Fault канала Kevin Stewart