Paradyne 6800 manual Monitor

Maintaining Multiplexers

If the multiplexer control processor experiences faults, its LED display will indicate the nature of the fault (if possible). For example, if the LED reads 333, the control processor is performing diagnostics. To identify a fault, read the rightmost digit of the LED display for the control processor card or cards. The codes correspond to status conditions, and are described in Steps 4, 5, 6, and 7.

CAUTION

In the following procedures where you are instructed to check power connections, you should make a visual inspection only. To avoid electrical shock, be sure to turn off power to the multiplexer before you examine any power connection.

4.If the control processor's LED display is blank, perform the following steps:

a.Make sure the control processor is secure in its shelf slot.

b.Check the power distribution connections. Figures C-1 and C-2 show the locations of these connections on the 740 multiplexer (both with and without the expansion shelf). Figure C-3 shows the location of these connections on the 745 multiplexer.

c.Check the power supply monitor and control connections. Refer to Figure C-1, C-2, or C-3 for the connections appropriate to your multiplexer.

d.Check the 4336 power supply monitor and control connections. Refer to Figure C-4 or C-5. If one of these power supplies has failed, the light on the front of the 4336 power supply may be flashing.

Power
Distribution
Connection
	J1
power	P11	P12	Power
			Monitor and
switch
			Control
AC	power connections
			Connection
fuse
	J1
power
			490-11631

Figure C-1. Power Connections for 740 Multiplexers without Expansion Shelf

6800-A2-GN22-30 January 1997 C-3