Qualstar XLS Series, Technical & Service Manual

Page: 244 / 366

14.5 Replacing Light Curtain Sensors
14-10
501610 Rev. 07-01-19
4. Replace the front panel. See Section 10.2 on page 10-7 .
5. Refer to Section 17.4 on page 17-8 to power on the library and scan the
fiducials and inventory.
14.5 Replacing Light Curtain Sensors
The light curtain, also known as the Inventor Sentry, consists of a number of emitter and
detector pairs installed in the LRM and MEM cabinets. The emitters, mounted on the
bottom of the cabinet, project small beams of light up to the corresponding detectors,
mounted at the top of the cabinet. The curtain of light formed by the emitters and
detectors allows the XLS to precisely monitor all areas within the LRM and MEM
cabinets, as follows:
•
The beams of light at the rear of the cabinet can detect whether a cartridge is
protruding from a slot. If the door(s) are closed and one of these beams of light is
broken, the XLS prevents the handler from moving to avoid hitting a protruding
cartridge.
•
The beams of light curtain at the front of the cabinet can detect when someone
reaches into the cabinet. If a door is open and one of these beams of light is
broken, the XLS detects and logs a potential inventory violation and
automatically scans the cartridges and drives in the affected area as soon as all
doors are closed.
The light curtain assembly consists of a series of printed circuit board assemblies (PCBAs)
and cables. The PCBAs are attached to the cabinet with sheet-metal brackets.
LRM Light Curtain:
As shown in Figure 14-7 on page 14-11 , the light curtain
assembly for the LRM includes PCBAs and cables in three locations at the bottom of the
cabinet and three locations at the top of the cabinet:
•
Bottom left (emitters)
•
Bottom right (emitters)
•
Bottom rear (emitters)
•
Top left (detectors)
•
Top right (detectors)
•
Top rear (detectors)