Table 3-2. Primary Monitor Console DS Maintenance Troubleshooting

TM 5-6350-275-24&P

Table 3-2. Primary Monitor Console DS Maintenance Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. PRIMARY MONITOR CONSOLE (PMC) CENTRAL PROCESSING UNIT (CPU) CANNOT COMMUNICATE WITH

PMC MULTIPLEXERS (FO-2).

Step 1. If there is a total system failure being reported at PMC CPU, verify that MUX Modules MSTR LEDs RX, GW,

STA, RTS, and TX are flashing on and off and verify ICS "ONLINE" indicator "B" is lit.

If all MUX Modules are indicating a failure, check the + 12 vdc and 5 vdc power on indicator lamps. At least one

lamp should be on for the + 12 vdc power supply and one lamp for each equipment rack for the 5 vdc power

supply. (Cabinet B)

If both the + 12 vdc power supply lamps are out, turn power on/off switch to off and remove the inline fuse by

pressing in on switch and turn counter clockwise, and replace if blown.

If LEDs are not flashing on and off, CPU is not polling MUX Modules. Replace RS232-1 cable (P) between

Cabinet A, DCX Module C3 and Cabinet B, RJ45 connector on Rackmount Assembly.

If LEDs are still not flashing on and off, Replace RS232 cable between the CPU PAR port and Cabinet B,

Intelligent Module connector.

If processor does not begin polling PMC Multiplexers, replace DCX module C3 on CPU (Para. 3-12). If CPU

begins polling Multiplexers, DCX module is bad. If CPU still does not poll Multiplexers, replace ICS switch (Para.

3-26) and then replace the B39 CPU (Para. 3-10). If CPU still does not poll Multiplexers, notify supervisor.

2. CPU CANNOT COMMUNICATE WITH SINGLE/MULTIPLE PMC MULTIPLEXER(S) (FO-2)

Step 1. If a single/multiple station failure is being reported at the PMC CPU, verify that MUX Modules MSTR LEDs

RX, GW, STA, RTS, and TX are flashing on and off.

Identify MUX Module(s) in which MSTR LEDs RX, GW, STA, RTS, and TX are not flashing on and off, and

replace the MUX Module(s). (Para. 3-26)

If all MUX Modules are indicating a failure, check the + 12 vdc and 5 vdc power on indicator lamps. At least

one lamp should be on for the + 12 vdc power supply and one lamp for each equipment rack for the 5 vdc power

supply. (Cabinet B)

If both the + 12 vdc power supply lamps are out, turn power on/off switch to off and remove the inline fuse by

pressing in on switch and turn counter clockwise, and replace if blown. If the MUX still indicates a failure, replace

the + 12 vdc power supply. (Para. 3-27)

If both 5 vdc power supply lamps are off, check the inline fuse located in the power on switch, and replace if

blown.

If the MUX still indicates a failure, replace the 5 vdc power supplies for that rack assembly. (Para. 3-28)

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