A Simulation Model for Machine Efficiency Improvement Using Reliability Centered Maintenance: Case Study of Semiconductor Factory

Table 4

FMEA worksheet for test machine components.

Mechanical part list (impact Lead defect)		Potential of failure mode	Effect	Severity	Occurrence	Detection	RPN
1	Vacuum pad	Wear	Dropped unit	8	4	9	288
2	Ejector filter	Blocking	Dropped unit	8	4	8	256
3	Picker cylinder	Erosion	Unit misplacement	8	4	9	288
4	Solenoid valve	Valve does not open/close	Dropped unit	6	4	8	192
5	Pitch ring	Wear	Unit misplacement	5	3	8	120
6	Pitch bearing	Wear	Unit misplacement	5	2	4	40
7	Timing belt	Damage	Unit misplacement	7	3	9	189
8	Test tray	Damage	Unit misplacement	6	1	4	24
9	Air tubing	Leakage	Unit misplacement	3	1	4	12
10	Motor shaft	Crack/fracture	Dropped unit	6	3	2	36
11	Motor stator	Open/short circuit	Dropped unit	5	2	2	20
12	Inserter	Breakage	Overpress on Lead	8	4	9	288
13	Lead pusher	Breakage	Overpress on Lead	8	4	9	288
14	Test socket	Pogo pin stuck	Overpress on Lead	8	5	8	320
15	Loader buffer	Wear	Unit misplacement	3	1	8	24
16	Loader preciser	Misalignment	Unit misplacement	6	1	8	48
17	Unloader preciser	Misalignment	Unit misplacement	7	3	8	168
18	Unloader sortable	Wear	Unit misplacement	4	1	8	32
19	Linear guide	Wear	Unit misplacement	8	4	9	288
20	Ball screw	Crack/fracture	Dropped unit	3	1	2	6