IBM 7133 D40, Service Manual

Page: 131 / 306

Step 5. (from step 2)
a. Unplug from the 7133, SSA attachment, or other device, the optical
extender whose Power light is off.
b. Refer to Figure 44.
c. At the connector from which you have unplugged the optical extender,
check the voltage between pins 5 and 8; it should be +5 volts.
Is the voltage correct?
NO
v
If the connector that you have just checked is on a 7133,
exchange, in the sequence shown, the following FRUs for new
FRUs. Ensure that for each FRU exchange, you go to “MAP 2410:
7133 Models D40 and T40 – Repair Verification” on page 131 to
verify the repair.
a. The first disk drive module in the string whose connector you
have just checked (see “Disk Drive Modules and Dummy Disk
Drive Modules” on page 150.
For information about disk drive module strings, see “Internal
Connections (Model D40)” on page 28 or “Internal Connections
(Model T40)” on page 30.
b. If present, the dummy disk drive modules that are between the
connector and the first disk drive module of the string (see
“Disk Drive Modules and Dummy Disk Drive Modules” on
page 150).
c. The bypass card containing the connector that you have just
checked (see “Bypass (SNBC) Cards” on page 201).
v
If the connector that you have just checked is on an SSA
attachment:
a. Exchange that SSA attachment for a new one (see the
Installation and Service Guide, or equivalent, for the using
system).
b. Go to “MAP 2410: 7133 Models D40 and T40 – Repair
Verification” on page 131 to verify the repair.
v
If the connector that you have just checked is on some other
device:
1 2 3 4 5
6 7 8 9
Ground
+5 Volts
Figure 44. SSA Connector Pins
Chapter 2. Problem Determination Procedures
113