Browse Prior Art Database

Reusable ESD Shunt for Tape Head-Cable Subassemblies

IP.com Disclosure Number: IPCOM000016387D
Original Publication Date: 2002-Nov-08
Included in the Prior Art Database: 2003-Jun-21
Document File: 2 page(s) / 193K

Publishing Venue

IBM

Abstract

Tape drives require that the tape head be tested before and after it is mounted to its head cables, while it is exposed to electrostatic discharge (ESD). Also, and perhaps most critical, is that the tape head may be part of a Field Replaceable Unit (FRU), and thus the FRU needs to be tested both during manufacturing and before being sent to the field for a repair action. However, all this time, the tape head needs protection from ESD. Accordingly, we propose a reusable/recyclable ESD shunt for tape heads so that the ESD protection can temporarily be removed for testing and then reinstated. A typical head cable 101 for a tape drive is shown in Figure 1. Head cable 101 has a plurality of conductors 102 which extend from the head end 103 to the I/O card end 105 of head cable 101. Head end 103 has connections 104 which are connected to the tape head, typically via solder. Card end 105 has connections 106 which are connected to an I/O card, again typically via solder. Cable 101 also typically has a plurality of holes 107, 108 for anchoring the cable to the I/O card. 104 104 103 103

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Reusable ESD Shunt for Tape Head-Cable Subassemblies

    Tape drives require that the tape head be tested before and after it is mounted to its head cables, while it is exposed to electrostatic discharge (ESD). Also, and perhaps most critical, is that the tape head may be part of a Field Replaceable Unit (FRU), and thus the FRU needs to be tested both during manufacturing and before being sent to the field for a repair action. However, all this time, the tape head needs protection from ESD. Accordingly, we propose a reusable/recyclable ESD shunt for tape heads so that the ESD protection can temporarily be removed for testing and then reinstated.

A typical head cable 101 for a tape drive is shown in Figure 1. Head cable 101 has a plurality of conductors 102 which extend from the head end 103 to the I/O card end 105 of head cable 101. Head end 103 has connections 104 which are connected to the tape head, typically via solder. Card end 105 has connections 106 which are connected to an I/O card, again typically via solder. Cable 101 also typically has a plurality of holes 107, 108 for anchoring the cable to the I/O card.

104104

103103

101101

102102

105105

107107

108108

Figure 1. Typical Head Cable Figure 2. Head Cable with Removable ESD Shunt

Figure 2 shows the addition of removable ESD shunt 110 across connections 106. Typically, the head cable 101 is attached to the tape head (not shown) and then the head-cable subassembly goes through various tests before it is eventually assembled to the I/O card. Also, the head-cable subassembly may be shipped to the field as a FRU (Field Replaceable Unit). Thus, there is a desire to supply removable ESD protection the head-cable subassembly. By removable, we mean that the same ESD protection can be selectively removed for the purposes of testing and then reapplied, all without physically altering the cable itself. To accomplish this selective removability and reapplication of the ESD shunt, we first propose that shunt 110 es...