TRAK MODEL 9100 MODULAR FREQUENCY/TIME SYSTEM
4-3
TM4400013
REV.
D
4-5.2
Distribution Failures
The Model 9100 may contain DDM, FDM and TEL distribution modules. If any of the modules fail, the front
panel indicator of the failed module will illuminate.
Before replacing the failed module, verify the following:
1. Remove all the cables connected to the failed module and depress the FSU “FAULT RESET”
switch. If the “FAULT” indicator of the module is cleared, the problem may be a shorted cable,
failure at the receiving end of the cable, or the cable is not properly terminated.
2. If the failure persists, replace the failed module as follows:
a) Loosen the two screws securing the failed module to the chassis.
b) Push down on the ejector handle to disengage the module and carefully pull on handle and withdraw
module from chassis.
c) Note the configuration of the failed module and configure the replacement module accordingly.
d) Install the new module and secure to chassis by tightening the two front panel screws.
e) Depress the FAULT RESET switch and assure that the FAULT indicator is extinguished.
4-5.3 Power
Supply
Failure
The Model 9100 contain AC/DC Power Supplies or optional DC/DC Power Supplies. If a Power Supply module
fails, the fault indicator of the failed module illuminates. Before replacing the failed module verify the following:
1. Correct input voltage is connected to the rear panel AC or DC input.
2. Rear panel Fuse is not open.
Warning: Power Supplies should not be inserted with power applied
To replace a failed Power Supply Module proceed as follows:
a) Remove AC power to the failed power supply. For example if the Power Supply module closest to the FSU
failed, remove power cord on rear panel labeled AC INPUT A. If Power Supply module closest to the edge
of the chassis failed, remove power cord on rear panel labeled AC INPUT B.
b) Before removing a failed Power Supply module, check to see if the fuse located on the filter fuse assembly
supplying AC power to the Power Supply Module is good. If the fuse is blown, replace fuse with the spare
fuse in the fuse compartment of the filter/fuse assembly. Remember to replace spare fuse in filter/fuse
assembly.
c) Reconnect AC power cord and verify to see that the power supply is operating properly.
d) If power supply is still inoperative, disconnect AC power cord and loosen the four front panel screws
securing the Power Supply to the chassis.
e) Holding the Power Supply module handle, carefully pull on handle and remove module.
f) Install a new power supply and secure to chassis by tightening the four front panel screws. Reconnect AC
power cord.
g) Verify that the “FAULT” indicator of the power supply is extinguished and all the green power supply
indicators are illuminated.
