TM 5-6350-275-24&P
Table 3-7. Intelligent Access Controller DS Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. INTELLIGENT ACCESS UNIT FAILURE (FO-9)
Step 1. Verify that asterisks on each side of the site specific designation are present on the LCD Display. This
indicates that the communication between the IAU and IAC is good.
If the above indication is correct, go to step 2.
If the LCD Display is blank, go to step 3.
Step 2. Swipe the Swipecard. A message should come up on the LCD Display, "Please Enter Pin". Enter the
four digit "PIN" number via keypad entry keys.
If the message is correct and entry is allowed, the IAU is operational.
If the message is incorrect or entry not allowed, replace the IAU (Para. 3-108).
Step 3. Remove the IAU front panel assembly. Check for a blown fuse on the PWA.
If fuse is blown, replace fuse and repeat steps 1 and 2.
If fuse is not blown, go to step 4.
Step 4. Set multimeter to vdc and check for +12 v across TB1 pins 1 and 2.
If voltage is correct, replace the IAU (Para. 3-108).
If voltage is not present, go to step 5.
Step 5. Remove the IAC front panel and check for +12 v across TB5, pins 1 and 2 for the Entry IAU or TB6,
pins 1 and 2 for an Exit IAU.
If voltage is present, replace the wiring between the IAC PWA, TB5 pins 1 and 2 or TB6 pins 1 and 2 and
the entry or exit IAU. Perform steps 1 and 2.
If entry is still not allowed, the problem is not the IAU. Go to troubleshooting procedures for the IAC
(Table 3-7, Malfunction 1).
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