To replace an I/O module, proceed as follows:
1. Push the I/O module into the chassis until its edge connector engages its mating connector on the chas-
sis motherboard.
2. Using a flat-blade screwdriver, tighten the captive screws to secure the I/O module in place.
3. Place the I/O module removal tool into its storage clip, and push the tool in until it its firmly seated.
4. Place the grounding bar in position across the rear of the RFL 9300. Using a flat-blade screwdriver, in-
stall and tighten the screws that secure the grounding bar to each I/O module.
5. Reconnect all wiring to the I/O module.
Use the tags placed on the wires during removal as a reference.
6. Place the protective cover in position across the rear of the RFL 9300, and tighten the two screws that
hold it in place.
7. Remove the shorts that were placed across each CT that is feeding the RFL 9300.
28.3.3 POWER SUPPLY MODULE
To remove a power supply module, proceed as follows:
1. Place the POWER switch on the power supply in the OFF position.
2. Lift the black locking lever to disengage the power supply from the internal heat sink.
3. Remove the power supply from the chassis by pulling on the ring at the top of the supply until the power
supply connector disengages from the motherboard connector.
4. Slide the power supply module out of the chassis.
28.4 FUSE REPLACEMENT
The fuse for the 9300 power supply is located on the power supply module front panel. To check the fuse, pro-
ceed as follows:
1. Place the POWER switch on the power supply in the OFF position.
2. Remove the input fuse from the front panel using a flat-blade screwdriver and turning counter-clockwise
until the cap is unscrewed. The fuse is pressed into the cap.
3. Remove the fuse from the fuse cap and inspect the fuse for damage.
If a fuse is bad, it must be replaced. If the fuse is good, check for presence of input volt-
age at TB1-1 and TB1-2 on the RFL 93B RELAY I/O module. If voltage is present and the
power supply does not function, the power supply module is defective and must be re-
placed.
4. Insert a fuse with the proper voltage and current ratings into the fuse cap and screw it into the fuse
holder until it is firmly seated. Do not over tighten.
For continued safe operation, always replace a fuse with one having the same voltage
and current ratings. Refer to Table 28-1 for the proper fuse value.
RFL 9300 RFL Electronics Inc.
May 5, 2002 28 - 5 (973) 334-3100
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