IBM 8646 Hardware Maintenance Manual - Page 50

System board jumpers and switches, System board jumper blocks

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System board jumpers and switches The following illustration identifies the jumpers and switches on the system board. Ethernet (J16) Video (J28) ABR disable jumper (J20) Switch block ASR (J14) NMI (J15) System board jumper blocks Flash ROM page-swap jumper (J38) SCSI (J37) Any jumper blocks on the system board that are not shown in the illustration are reserved. For normal operation of the system, the default jumpers shown in the following table should be installed. To disable the functions listed in the table, install a jumper (Except for J38). Table 8. Jumper descriptions Jumper Description Default J14 Automatic Server Restart (ASR) J15 Forces an NMI signal No jumper No jumper J16 On-board Ethernet controller No jumper J20 Automatic BIOS Recovery (ABR) No jumper J28 On-board Video controller No jumper J33 Reserved J37 On-board SCSI controller No jumper J38 Flash ROM page jumper Jumper pins 2 and 3 42 Hardware Maintenance Manual: xSeries 220 Type 8646

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System board jumpers and switches
The following illustration identifies the jumpers and switches on the system board.
Flash ROM
page-swap
jumper (J38)
Switch block
ABR disable
jumper (J20)
NMI (J15)
Ethernet
(J16)
Video
(J28)
ASR (J14)
SCSI (J37)
System board jumper blocks
Any jumper blocks on the system board that are not shown in the illustration are
reserved. For normal operation of the system, the default jumpers shown in the
following table should be installed. To disable the functions listed in the table,
install a jumper (Except for J38).
Table 8. Jumper descriptions
Jumper
Description
Default
J14
Automatic Server Restart (ASR)
No jumper
J15
Forces an NMI signal
No jumper
J16
On-board Ethernet controller
No jumper
J20
Automatic BIOS Recovery (ABR)
No jumper
J28
On-board Video controller
No jumper
J33
Reserved
J37
On-board SCSI controller
No jumper
J38
Flash ROM page jumper
Jumper pins 2 and 3
42
Hardware Maintenance Manual: xSeries 220 Type 8646