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SEMI S8-0705 © SEMI 1995, 2005 33 R3-3.3 The number and diversity of fasteners used should be minim ized. Fasteners requiring non-st andard t ools should be avoi ded, except wher e access is to be restricted. R3-3.3.1 Hi…
SEMI S8-0705 © SEMI 1995, 2005 32
RELATED INFORMATION 3
DESIGN FOR MAINTAINABILITY AND SERVICEABILITY
NOTICE: This related information is not an official part of SEMI S8 and is not intended to modify or supersede the
official guidelines. It was derived from the work of the originating task force. Publication was authorized by full
ballot procedures. Determination of the suitability of the material is solely the user’s responsibility.
R3-1 General Considerations
R3-1.1 Equipment design should facilitate rapid and positive fault detection and isolation of defective items.
R3-1.2 Standard parts should be used whenever prac-ticable. Where practical, components should be replace-able
as modular packages and configured for rapid re-moval and replacement (e.g., use of a standard fastener throughout
a design).
R3-1.3 Equipment requiring periodic calibration and adjustment should be readily accessible without disassembly.
R3-1.4 Use of cleanroom gloves reduces maximum allowable grip forces listed in Related Information 1, Table R1-
3 by 15%.
R3-1.5 Use of cotton gloves reduces maximum allowable grip forces listed in Related Information 1, Table R1-3 by
26%.
R3-1.6 Use of chemical protective gloves reduces maximum allowable grip forces listed in Related Information 1,
Table R1-3 by 19%.
R3-1.7 Component design should preclude improper mounting and installation of any component.
R3-1.8 Guides, tracks, or stops should be provided as necessary to facilitate handling and prevent damage to
equipment or injury to personnel.
R3-1.9 Refer to ANSI/IES “Practice for Industrial Lighting” for recommended illumination based on task
characteristics.
R3-1.10 Structural members or permanently installed equipment should not visually or physically prevent
adjustment, servicing, removal of replaceable equipment, or other required maintenance tasks.
R3-1.11 Items which require rapid or frequent maintenance should be most accessible. Predicted or known high
failure-rate items should be accessible for replacement with minimal removal of nearby or adjacent non-failed items.
If it is necessary to remove non-failed items, then the total ergonomic impact must be assessed to determine
conformance.
R3-1.12 Sufficient space should be provided for the use of standard test equipment and required maintenance tools
without difficulty or hazard. Self-checking or built-in test features are recommended.
R3-2 Cables, Connectors, Plugs, Receptacles, and Circuit Boards
R3-2.1 Connectors which may need to be disconnected and reinstalled during the life of the tool that are mounted in
close proximity should have clearance so that each one can be easily removed and reinstalled.
R3-3 Equipment Enclosures
R3-3.1 Equipment enclosures should be easily removable or sufficiently larger than the item they cover to facilitate
installation and removal of components.
R3-3.2 Cover or shield holes should be large enough for fastener clearance without precise alignment.
R3-3.2.1 Access openings should be designed to permit unobstructed physical and visual operation. Size and shape
of the access should allow for easy passage of equipment and body parts of a 95th percentile North American male
with necessary PPE and tools, as appropriate.
R3-3.2.2 Unless prohibited from a microcontamination standpoint, access covers should be hinged or sliding. Lift
off covers will require manual material handling analysis.
SEMI S8-0705 © SEMI 1995, 2005 33
R3-3.3 The number and diversity of fasteners used should be minimized. Fasteners requiring non-standard tools
should be avoided, except where access is to be restricted.
R3-3.3.1 Hinges, tongue-and-slot catches, and mounting pins should be used to minimize the number of fasteners
required. Pin and hook arrangements are preferred to hinges for contamination control.
R3-3.3.2 Captive fasteners should be used where dropping or loss of such items could cause damage to equipment
or create difficult or hazardous removal. Captive fasteners should also be provided for access covers requiring
frequent removal.
R3-3.3.3 Fasteners should require the minimum number of turns compatible with mechanical stress, alignment,
positioning, and load considerations. Items requiring removal for daily or more frequent inspection and servicing
should use quick release fasteners.
SEMI S8-0705 © SEMI 1995, 2005 34
RELATED INFORMATION 4
HAZARD ALERTS, LABELS, AND ALARMS
NOTICE: This related information is not an official part of SEMI S8 and is not intended to modify or supersede the
official guidelines. It was derived from the work of the originating task force. Publication was authorized by full
ballot procedures. Determination of the suitability of the material is solely the user’s responsibility.
R4-1 Hazard Alerts
R4-1.1 Potential hazards to the user, equipment, or product should be identified and documented. An evaluation
should be made as to the appropriate method(s) of alert, alert content, and location. More than one method of hazard
alert may be necessary. Refer to SEMI S1.
R4-1.2 Hazard alerts should be consistent with information provided in operator and maintenance manuals and
other training information materials.
R4-1.3 Hazard alerts can be provided by labels, signs, placards, visual alerts, auditory alarms, status indicators, or
hazard alert systems integral with the equipment’s operating system (e.g., displayed through the video display).
R4-1.4 Hazard alerts and fault messages should be specific and communicate the consequences of engaging
hazards.
R4-2 Labels
R4-2.1 Hazard alert labels should be located such that they are readily visible to the intended viewer and alert the
viewer to the potential hazard in time to take appropriate action.
R4-3 Audible Alarms
R4-3.1 To avoid noise pollution, alarms should be reserved for situations requiring immediate intervention to
prevent personal injury, equipment damage, process disruption, or product damage.
R4-3.2 Alarm design should take into account impairments that may be caused by clothing and hearing and eye
protection.
R4-3.3 Users should be provided with an input device for acknowledging and canceling alarms without erasing
information that accompanies the alarm. The capability to cancel alarms should be evaluated for its impact on
safety.
R4-3.4 Alarm decibel levels will require a setpoint above the background noise levels sufficient to meet local
regulations.