TRAK MODEL 9200 MODULAR FREQUENCY/TIME SYSTEM
4-2
TM4400013
REV.
D
4-5.1
Distribution Failures
The Model 9200 contains up to 14 Distribution Modules. If any of the modules fail, the appropriate FAULT
indicator on the failed Distribution Module illuminates. Test points are provided to verify reference signals are
present.
Before replacing a failed module, remove all coaxial signal output cables, on the rear panel, associated with the
failed module and depress the TFL “FAULT RESET” switch (on the 9200). If the “FAULT” indicator of the
module is cleared, the problem may be a shorted cable or a failure at the receiving end of the cable. For proper
operation of the distribution fault sense circuits, cable ends must be terminated into 50
Ω
. If the failure persists
replace the failed module as follows:
a.
Loosen the two screws securing the failed module to the chassis.
b.
Holding the handle of the module, carefully pull on the handle and withdraw module.
c.
Install the new Distribution module and secure to chassis by tightening the two front panel
screws.
d.
At the TFL front panel, depress the FAULT RESET switch and assure that the
FAULT indicator is extinguished.
4-5.2
Terminator and Fault Logic (TFL) Module Failures
If the FAULT indicator on the TFL module illuminates and/or there is a loss of external communications, replace
the TFL module.
a.
Loosen the two screws securing the failed module to the chassis.
b.
Holding the handle of the module, carefully pull on the handle and withdraw module.
c.
Install the new module and secure to chassis by tightening the two front panel screws.
d.
Depress the TFL FAULT RESET switch and assure that the FAULT indicator is extinguished.
4-5.3 Power Supply Failure
If a Power Supply Module fails, the fault indicator of the failed module illuminates and one or more of the power
present indicators will be out. 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 or DC INPUT A. If Power
Supply module closest to the edge of the chassis failed, remove power cord on rear panel
labeled AC or DC 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 or DC and verify that the power supply is operating.
d.
If power supply is still not working, disconnect AC power cord or DC and loosen the four front
panel screws securing the Power Supply to the chassis.