RFL 9660 RFL Electronics Inc.
August 18, 1998 10-3 (973) 334-3100
10.2.2 I/O MODULE FUSE REPLACEMENT
If your RFL 9660 is equipped with an ac-input power supply, it will also contain an RFL 96 AC/ALARM I/O Ac-
Input Power/Alarm I/O Module (Assembly No. 104400-1). This I/O module will have two fuses mounted to a
daughterboard that plugs onto its main circuit board. To check these fuses, proceed as follows:
1. Place the POWER switch on the power supply module in the OFF position.
2. Using a flat-blade screwdriver, loosen the four quarter-turn fasteners securing the power/alarm I/O
module in place.
3. Using the terminal block as a handle, rock the I/O module back and forth until it disconnects from its
mating connector on the chassis motherboard. Once it disconnects, Pull on the terminal block until the
I/O module is out of the chassis.
4. Using a fuse puller or a flat-blade screwdriver, remove fuses F1 and F2 from the fuse clips on the
daughterboard.
5. Inspect each fuse for damage.
If the fuse is bad, it must be replaced. If the fuse is good, check for presence of input
voltage at TB1-9 and TB1-10 on the rear-panel terminal block. If voltage is present and
the power supply does not function, the power supply module itself is defective and
must be replaced.
6. Insert a fuse with the proper voltage and current ratings into each set of fuseholder clips on the
daughterboard, and push it in until the fuse is firmly seated.
The fuses installed on the daughterboard are 3AG slow-blow types, rated for 1 ampere
@250 Vac (Littelfuse 313001 or equivalent, RFL P/N 6645). For continued safe operation,
always replace a fuse with one having the same voltage and current ratings.
7. Line the edges of the I/O module up with the card guides in the chassis. Once they are lined up, push
the I/O module in to the chassis until its panel is flush with the other I/O modules on the rear of the
chassis.
8. Using a flat-blade screwdriver, turn the four quarter-turn fasteners on the panel one quarter-turn to
secure the I/O module in place
9. Place the power switch in the ON position.
If all the indicators on the front of the power supply module light, the power supply is
working properly. If all five indicators do not light or if one or both fuses blow again, the
power supply module is defective and should be replaced.
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