Abstract: An optical monitoring unit includes a transmitting unit having plural light emitting diodes that are connected together two at a time in respective diode pairs. Each diode of each diode pair is respectively selectively connectable to a current source so as to operate as an active transmitting diode, or to a load resistor across which a voltage may be measured so as to operate as a monitoring diode. When any selected single diode is operated as the transmitting diode, its light output is measured and evaluated by operating the other diode of the pair as the monitoring diode, which receives optical crosstalk from the light output of the transmitting diode and correspondingly generates a photoelectric current through the load resistor.

Abstract: The deposit drawer includes a first slide which is guided carriage-like in a longitudinal channel open at one side which is provided in the deposit drawer by a second slide guided carriage-like in a longitudinal channel of the first slide and having a detent angle put in place thereon; and by a fashioning of both slides in such fashion that the upper surfaces of the deposit drawer, first slide, and second slide merge flush into one another.