Troubleshooting - Tadiran Telecom Coral FlexiCom 6000 Installation Procedure And Hardware Reference Manual

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Coral FlexiCom 6000 Installation Manual

Troubleshooting

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Power supply failure generally results in the loss of one or more output voltages.
However, protection circuitry in the power supply regulator circuitry may shut down
a regulator due to a current overload caused by an external fault.
Measure all voltage outputs from the power supply to determine that they are within
acceptable limits. If any voltage except the –48VDC is too high, the PPS should be
replaced. If one or more voltage is too low, continue the troubleshooting procedure
described below.
All maintenance activities are to be carried out by a qualified service technician.
Trouble Shooting Procedure
1. Each PPS can support two fully populated peripheral shelves. The outputs of
the PPS are designed to be paralleled with the outputs of a second PPS. In
cabinets with 2 peripheral shelves, the power supply slots of both peripheral
shelves are wired in parallel. In cabinets with 3 peripheral shelves, the lower
two peripheral shelves are wired in parallel, while the top peripheral shelf
stands alone. In cabinets with 4 peripheral shelves, the lower two peripheral
shelves are wired in parallel, and the upper two peripheral shelves are wired in
parallel.
2. Turn the PPS power switch OFF (turn the switch downwards).
3. Remove all cards from the (one or two) relevant shelves so that they protrude
from the shelves by approximately 1 inch (2.5 cm).
4. Switch ON the PPS and measure the voltage outputs once again. If the
voltages return to acceptable levels, the problem is caused by one of the cards
that were removed.
5. To determine which card is causing the problem, insert the shared service and
peripheral cards into their appropriate slots, one at a time.Measure the affected
voltage each time a card is inserted. If the voltage drops after a particular card
is inserted, that card is faulty, and should be replaced.
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Power Supplies