(continued)
015 (continued)
DOES THE SYSTEM UNIT WORK NORMALLY EXCEPT FOR THE
MODEM?
Yes No
016
Go to “Start” on page 2-2.
017
– Power off the system unit.
– Reconnect the riser card.
– Remove the modem adapter card from the riser card.
– Power on the system unit.
– Check the voltages at pins B3, B5, B7, and B9 on the top of the riser
card.
B3 = +5 V dc
B5 = −5 V dc
B7 = −12 V dc
B9 = +12 V dc
B
A
91357
(Connector side)
(Pin side)
91357
A
B
Figure 2-8. Riser Cards - Machine Type 2144 and 2168
(Step 017 continues)
2-52
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