User manual

Canoga Perkins 2201 Rack Chassis/2200R Redundant Card

NOTE: On older units, only eight pins (pin 1-8) were used. However,

old connectors are compatible with new plugs, and vice versa,

due to the location of the key.

3.3 2201 Secondary Circuit Fuses

There are six fuses employed inside each rack chassis power supply. Each protects

one of the secondary circuits leading to the modem positions.

WARNING!

Be certain that the main power cord is disconnected when

accessing the internal fuses.

To access these fuses, remove the retaining screws that hold the power supply cover

in position. The fuses are positioned on each side of the supply in groups of three.

They may be removed for inspection, and/or replacement. Replace with the same

rating of fuses.

3.4 2201 Monitor Board

3.4.1 Single Power Supply Failure Alarm

If the 2201 employs only one power supply monitor board (in the A or Lower position),

and one of its output circuits fails, an audible warning will sound. This will cause the

failure indicator for power supply “A” to light.

The audible warning will continue until the “Alarm Reset” button is pressed. This

does not cure the problem, so the power supply should be repaired or replaced. The

failure indicator will continue to be lit until the supply failure is corrected.

When the above type failure occurs, the entire system may be partially affected. Note

which modems in the rack do not have “Power On” indicators lit then identify the card

positions. Every power supply contains three secondary output circuits to feed the

2201 backplane (card positions 1, 2 and 3 are on one circuit; 4, 5 and 6 on another; and

positions 7 through 10 are on yet another).

If the 2201 has empty card positions, modems residing in the affected positions may

be moved to non-affected positions. If extra card positions are not available, the

modems affected should be put out of service until the supply is replaced.