RFL 9660 RFL Electronics Inc.
August 18, 1998 10-1 (973) 334-3100
Section 10. MAINTENANCE
10.1 INTRODUCTION
This section provides maintenance information for the RFL 9660 Digital Switch. Customer maintenance is
limited to power supply fuse replacement; all other maintenance must be performed by qualified service
personnel. Information is also provided in this section on how to arrange for service.
10.2 FUSE REPLACEMENT
Three different fuse replacement procedures are given in this section: one for the RFL 9660's power supply, one
for the power/alarm I/O module used in ac-powered RFL 9660s, and one for the RFL 9660's fiber optic remote
module.
10.2.1 POWER SUPPLY FUSE REPLACEMENT
An RFL 9125 25-Watt Power Supply Module furnishes input power for the RFL 9660. Several different models
are available, for a wide range of input voltages. Some models have their fuses on the main circuit board; the
module will have to be removed from the chassis to gain access to the fuses. On other models, the fuses are
located in fuseholders on the front of the module; these fuses can be changed without removing the power
supply from the chassis.
To check the power supply fuses, proceed as follows:
1. Place the POWER switch on the RFL 9125 in the OFF position.
2. If the power supply does not have front-panel fuseholders, remove the fuses as follows:
a. Using a flat-blade screwdriver, loosen the four quarter-turn fasteners securing the power supply
module in place.
b. Pull on the module handle until the module is out of the chassis.
c. Using a fuse puller or a flat-blade screwdriver, remove fuses F1 and F2 from the fuse clips near
the rear of the input converter board.
3. If the power supply does have front-panel fuseholders, remove the fuses as follows:
a. Push in on one of the fuseholder caps with a flat-blade screwdriver.
b. Turn the cap counter clockwise about 1/4 turn.
The cap will pop out of position.
c. Remove the fuse from the fuseholder cap.
d. Repeat steps 3a through 3c to remove the other fuse.
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