RFL 9660 RFL Electronics Inc.
August 18, 1998 10-4 (973) 334-3100
10.2.3 FIBER OPTIC REMOTE MODULE FUSE REPLACEMENT
Each RFL 96 FO Fiber Optic Remote Module contains a power supply board that provides all the power
required by the fiber optic transceiver circuits in the fiber optic remote module. 48-volt and 129-volt units are
protected by fuses that are located on the board itself; 9-volt power supply boards are not equipped with fuses.
To determine if a fuse needs to be replaced, proceed as follows:
1. Look at the indicators on the front of the fiber optic remote module.
If the PWR and FIBER DATA indicators are lit, the fiber optic remote module is working
properly. Do not perform the rest of this procedure.
If the PWR indicator is not lit, check for the presence of station battery voltage at
terminal blocks TB1-5 (positive) and TB1-4 (negative) on the rear panel. If station battery
voltage is not present, troubleshoot the station wit\ring to determine the cause and fix it.
If the PWR and FIBER DATA indicators light once station battery voltage is restored, do
not perform the rest of this rocedure.
If station battery voltage is present on the terminal block and the PWR and FIBER DATA
indicators are not lit, go on to step 2.
2. Using a Phillips screwdriver, remove the four screws securing the rear panel to the case.
3. Using terminal block TB1 as a handle, pull on the rear panel until the circuit boards are out of the case.
4. Using a fuse puller or a flat-blade screwdriver, remove fuse F1 from its clips on the circuit board and
inspect it for damage.
If the fuse is bad, it must be replaced. If the fuse is good, check for presence of input
voltage across TB1-4 and TB1-5 on 48-volt and 129-volt units, or TB1-1 and TB1-2 on
9-volt units. If input voltage is present and the fiber optic remote module does not
function, it is defective and must be replaced.
5. Insert a fuse with the proper voltage and current ratings into the clips and push it in until it is firmly
seated.
For continued safe operation, always replace a fuse with one having the same voltage
and current ratings. Refer to Table 10-2 for proper fuse values.
Table 10-2. Fuse replacement data, RFL 9660 fiber optic remote modules
Input Voltage Assy. No. Fuse Rating Manufacturer's Type Part Number
9 Vdc 104495-1 No fuse in this model . . . . . .
48 Vdc 104495-2 3AG slow-blow, 250V, 1/2A Littelfuse 313.500 or equiv. 6723
129 Vdc 104495-3 3AG slow-blow, 250V, 0.15A Littelfuse 313.150 or equiv. 14392
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