NEC Univerge SV8500 Operation And Maintenance Manual page 56

(4) When a circuit card appears 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 1-6 shows a leg that is bent and not
set in the socket.
ROM
(5) How to clean the connector portion (gold-plated terminal):
(a) Dip the gold-plated terminal portion in the cleaning fluid for three to five seconds (only PA-XX type
circuit card), as shown in Figure 1-7.
Some of the parts are subject to damage if they come in contact with the cleansing liquid. Be careful to
Note 1:
allow only the connector portion (gold-plated terminal) to contact the cleaning liquid.
Be sure to use fresh cleaning fluid (FREON or isopropyl alcohol).
Note 2:
Figure 1-6 How to Set the ROM in IC Socket
SOCKET
Figure 1-7 How to Clean the Connector Portion
Circuit
– 9 –
A pin is bent, not
inserted in the socket.
Cleaning
Container
CHAPTER 1 General