2.5 Air System Malfunction
Chapter 2: Troubleshooting
2 - 14 Affinity® Four Birthing Bed Service Manual (195826 REV 2)
5. Do a visual check of the air hoses for leaks, disconnected hoses, or obstructed hoses. The hoses are
in good condition.
Yes No
Repair or replace the hoses. If this solves the problem, go to “Final Actions” on
page 2-9. Otherwise, go to Step 6.
6. Do the check of the air pump.
a. Set the multimeter to measure AC volts (V AC).
b. Put the leads of the multimeter on pins 1 and 2 of the P9 connector on the logic control P.C.
board (see
Figure 2-2 on page 2-3). The voltage is 22-28V AC when the Seat Inflate or Lumbar
Inflate control is pressed.
Yes No
Replace the logic control P.C. board (see Procedure 4.21 on page 4-36).
c. Replace the air pump (see Procedure 4.17 on page 4-29).
7. Do the check of the lumbar solenoid:
a. Set the multimeter to measure DC volts (V DC).
b. Put the leads of the multimeter on pins 1 and 2 of the P12 connector on the logic control P.C.
board (see
Figure 2-2 on page 2-3). The voltage is 0 V DC, and rises to 10-12 V DC and settles to
5-6 V DC when the Lumbar Inflate or Lumbar Deflate control is pressed.
Yes No
Replace the logic control P.C. board (see Procedure 4.21 on page 4-36).
c. Replace the air manifold (see Procedure 4.18 on page 4-32).
8. Do the check of the seat solenoid:
a. Set the multimeter to measure DC volts (V DC).
b. Put the leads of the multimeter on pins 3 and 4 of the P12 connector on the logic control P.C.
board (see
Figure 2-2 on page 2-3). The voltage is 0 V DC, and rises to 10-12 V DC and settles to
5-6 V DC when the Seat Inflate or Seat Deflate control is pressed.
Yes No
Replace the logic control P.C. board (see Procedure 4.21 on page 4-36).
c. Replace the air manifold (see Procedure 4.18 on page 4-32).
9. Do the check of the exhaust solenoid:
a. Set the multimeter to measure DC volts (V DC).
b. Put the leads of the multimeter on pins 5 and 6 of the P12 connector on the logic control P.C.
board (see
Figure 2-2 on page 2-3). The voltage is 0 V DC, and rises to 10-12 V DC and settles to
5-6 V DC when the Seat Deflate or Lumbar Deflate switch is pressed.
Yes No
Replace the logic control P.C. board (see Procedure 4.21 on page 4-36).
c. Replace the air manifold (see Procedure 4.18 on page 4-32).
10. Install the top motor cover (see Procedure 4.1 on page 4-3).
11. Go to “Final Actions” on page 2-9.
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