ROC364 Instruction Manual
2-12 Master Controller Unit, I/O Module Rack, and Wiring Rev Jun/05
2.5 Troubleshooting and Repair
The troubleshooting and repair procedures help identify and replace faulty boards, fuses, and
FlashPACs. Refer to Section 3 for troubleshooting I/O modules or Section 4 for troubleshooting and
replacing a communications card. Return faulty boards and FlashPACs to your local sales representative
for repair or replacement.
The following tools are required for troubleshooting:
♦ IBM-compatible personal computer.
♦ ROCLINK configuration software.
♦ Digital multimeter, Fluke 8060A or equivalent.
2.5.1 LED Indicators
The Light-emitting diode (LED) indicators, located on the front panel of the MCU, give a first-level
indication of the operation of the ROC. Figure 2-7 shows the location of the indicators and Table 2-2
describes them.
The primary indicator that the MCU is operating normally is the System Status indicator. This indicator
should light within a few seconds after power is applied, and then remain lit. If the System Status
indicator does not remain lit, refer to Table 2-2 for possible causes.
POWER
UX OUT 1
UX OUT 2
SYSTEM
STATUS
DOC0122A
Figure 2-7. MCU Status Indicators
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