SECTION III: SENDING UNITS, WARNING LlGHT SWITCHES, ANDTM 9-2350-256-20WARNING HORNSc. ASSEMBLY1Install rheostat (38), using three screws (35), three new lockwashers (37), and three nuts (36).2Install cap (32), new lockwasher (34), and screw (33).3Install screw (29), new lockwasher (30), and nut (31).4Install bracket assembly (21) using two screws (26), two new lockwashers (28), two nuts (27), two loop clamps(25), two screws (22), two new lockwashers (24), and two nuts (23).5Install 3 new gaskets (18) and 3 connectors (17), using 12 screws (19) and 12 new lockwashers (20).6Install two diodes (13) using two screws (14), six new lockwashers (16), and two nuts (15).7Install relay (10) using eight screws (11) and eight new lockwashers (12).8Install new gasket (7) and relay switch cover (6) using 16 new lockwashers (9) and 16 screws (S).d. CALIBRATIONNOTEl No calibration is required if the auxiliary power unit or switching relay box is removed andreinstalled with no change being affected.l System must not be operated four hours prior to performing this calibration procedure.1Place multimeter on one volt scale, and connect black lead (39) to wire of circuit 478A (40) at switching relaybox (3) (ie., sharpen tip with file, and puncture circuit 478A insulation).2Connect red lead (41) of multimeter onto a piece of extension wire, and connect other end of wire tomounting screw (42) of APU flywheel guard (43) inside AFU access door (44).Change 16-44.1
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