Figure B-7 Control Board Block Diagram; Figure B-8 Power Distribution Block Diagram - Sun Microsystems SPARCserver 1000 Service Manual

B
Clock generators
JTAG buffers
JTAG PROM
B.8 SBus Cards
B.9 Power Distribution
AC power input
AC power
B.9.1 Power Supply
B-6
Backplane connector
Ring 2
JTAG slave
Ring 0
Figure B-7 Control Board Block Diagram
SBus cards allow the use of a wide variety of I/O options like graphic displays,
Ethernet, FDDI, printers, etc. Each system board supports 0-3 SBus cards.
Figure B-8 shows power distribution. AC input power is routed to the power
supply via a 30-ampere circuit breaker in the fan tray.
Fan tray
Power supply
SCSI tray
DC power
Figure B-8 Power Distribution Block Diagram
The 650-watt power supply provides +1.2, +5, +12, and -12-volt DC power to
the control and system boards via the backplane and +5 and +12-volt DC
power to the SCSI tray. The supply also produces +24-volt DC for the fan tray.
SPARCserver 1000 System Service Manual—June 1996
CARBs
Ring 1
Backplane
Control board
Reset logic
Driver/Receiver
SVP connector
System boards