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)
3-5
