Service manual

System Overview 1-3
➊ System card cage, which holds the system motherboard and the CPU, memory,
bridge, and power control modules. (The difference between the BA30A and the
BA30C is the system motherboard.)
➋ PCI/EISA card cage, which holds the PCI motherboard, option cards, and server
control module.
➌ Server control module, which holds the I/O connectors and remote console
monitor.
➍ Control panel assembly, which includes the control panel, a floppy drive, and a
CD-ROM drive.
➎ Power and cooling section, which contains one to three power supplies and fans.
Cover Interlocks
The system drawer has three cover interlocks: one for the system bus card cage, one
for the PCI card cage, and one for the power and system fan area.
Figure 1-2 Cover Interlock Circuit
OCP
Logic
OCP
Switch
Power Supply
Cover
Interlocks
B3040
B3050
POWER_FAULT_L
PCM
Motherboard
PKW-0403-95
17-04217-01
17-04201-02
DC_ENABLE_L
RSM_DC_EN_L
SCM
17-04201-01
Or
17-04302-01
3 Interlock
Switches
To O C P
17-04196-01
70-
32016-
01
70-32016-01
NOTE: The cover interlocks must be engaged to enable power-up.
To override the cover interlocks, find a suitable object to close the interlock circuit.