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CHAPTER 2 NDA-24300
Page 28
Issue 1
SYSTEM MAINTENANCE OUTLINE
(3) When a circuit card appears to be faulty, check the following items before replacing it with a spare:
(a) Poor connector contact at the circuit card may be responsible for the fault. Repeat insertion and ex-
traction of the circuit card a few times. Clean the connector portion, and recheck for proper operation.
(b) Check the lead wires of vertically-mounted parts (resistors, capacitors, etc.) to ensure they have not
shorted each other or broken.
(c) Check the back side of the circuit card to see if there is any short-circuited soldered portion, or mod-
ified cross connection wires erroneously left unconnected.
(d) Check the ROMs to ensure proper seating in the IC socket. Figure 2-21 shows a leg that is bent and
not set in the socket.
Figure 2-21 How to Set the ROM in IC Socket
A pin is bent, not
inserted in the socket.
ROM
SOCKET