Microprocessor-board connectors and LEDs
The following illustration shows the connectors and LEDs on the microprocessor
board.
Microprocessor 4
VRM connector
Microprocessor 3
VRM connector
Microprocessor card
error LED
Microprocessor 4 socket
Microprocessor 3 socket
Microprocessor 3 error LED
VRM 3 error LED
VRM 4 error LED
Microprocessor 4 error LED
Microprocessor 2
error LED
Microprocessor 1
error LED
Microprocessor 1
socket
Microprocessor 2
socket
Fan 4
Fan 8
Fan 3
Fan 7
Fan 6
Fan 2
Fan 5
Fan 1
Memory
card 1
Memory
card 2 Memory
card 3
Memory
card 4
Light path diagnostics
button
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18 IBM System x3950 Type 8878 and System x3950 E Type 8879: User’s Guide