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Figure 3 - 5 . Sensor Board
3 . 1 1
FEATURE BOARD C H E C K S
All of the feature boards in the IBM 9001 are interconnected through a
common bus in the expansion board , and they a l l use a common power supply
distributed through the expansion board .
be caused by the loading of the common bus by another (apparently func
t ioning)
feature board .
l oading of the common bus by another board or a faulty expansion board
is the cause of the prob l em .
3 . 1 1 . 1
POWER SOURCE V E R I F ICATION
U s ing the VOM , verify that the + 5 Volt supp ly to the mal functioning fea
ture board is at least 4 . 8 Volts .
7 ( - ) and 14 (+) on a 14- pin integrated circuit ( IC ) or between pins 8 ( - )
and 16 (+) on a 16 - pin IC .
IC , and 8 and 16 on a 16 -pin IC .
Optional Diagnostic, Voltage , and Res istance Checks 3 - 18
A feature board mal funct ion may
The following checks determines whether the
This is done by measuring between pins
Figure 3-6 ident i fies pins 7 and 1 4 on a 1 4- p in
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