Mid-Plane - IBM F10 Service Manual

v Presence or absence of two power supply FRUs and two fan FRUs
v Fault lines for five drive FRUs, which includes blinking the LED to identify a
v Operational status lines for the power supplies and fans
v Temperature levels
The temperature monitor chip continuously checks the temperature inside the drive
module and activates an alarm signal when one of the following occurs:
v Internal temperature rises above 40° C (104° F). If this occurs, the temperature
v Internal temperature rises above 50° C (122° F). If this occurs, the temperature
Table 32. VUPT Byte Assignments
Bit/ 7 6
Byte
0 UPS-inpl* Too_hot
(>50°C)
For additional information topics relating to the ESM board, refer to:
v Replacing a failed ESM board, see "Replace a Failed ESM FRU" on page 170.
v Determining and changing drive IDs and other interface options, see "Drive
v Troubleshooting SCSI interface problems, see "Hints for Troubleshooting

Mid-Plane

The mid-plane is the primary interconnect board inside the drive module (see
Figure 78). The mid-plane provides power and SCSI interface connections between
the drives, power supplies, fans, and ESM board. The mid-plane has fifteen
connectors:
v Ten front connectors for the drives
v Five back connectors for the ESM board, two power supplies, and two fans
148
IBM 2102 Model F10 and Model D00 Service Guide
specific drive
monitor sets the Enclosure Temperature Alert ( ETA ) bit to 1, which turns on the
amber Fault LED on the ESM FRU.
monitor reports a second sensor status to the host through the Vendor Unique
Pass-Thru ( VUPT ) byte, which also contains drive channel number, SCSI ID, and
UPS status line assignments (see Table 32).
5
Diffsense State
LVD = High SE
= Low
Numbering" on page 144 and Step 5 of "Installing the Drive Module" on page 49.
Interface Problems" on page 169.
4 3 2
Bus_ID Modid_3 Modid_2
1 0
Modid_1 Modid_0