IBM 4840-544 Service Guide - Page 205
Connector-pin, assignments, External, connectors
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August 3, 2006 Connector-pin assignments Connector-pin assignments This following sections list the connector-pin assignments for the external and internal connectors. External connectors The following sections show the connector-pin assignments for external connectors. Speaker connector | This connector is functional for Models 563, 564, and 573 only. For access, you must remove the HDD cover. 5 1 Table 21. Speaker connector-pin assignments Pin Connect | 1 +12 V dc 2 Ground 3 Line Left 4 Line Right 5 Ground MSR connector 8 1 Table 22. MSR connector-pin assignments Pin 1 2 3 4 5 6 7 8 Connector +5 V dc Serial data out Serial data in Ground KBD enable Keyboard data Keyboard clock Ground Appendix C. System specifications and planning information 179