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3.3 TROUBLESHOOTING
The troubleshooting procedures are grouped by affected ORU and are keyed to the LED
indicators and the alphanumeric display. First, a malfunction symptom is listed, then
instructions are given to check or replace parts in order of the most likely causes. In the
following procedures the indicated LEDs are red unless otherwise stated. Refer to Section
4 for disassembly and assembly instructions. Always turn power off before removing or
replacing a part on the module, as this protects equipment from voltage transients and
ensures proper initialization. If the fault cannot be corrected by performing these
procedures, refer to Appendix A for further information on the alphanumeric display. If
the fault still cannot be isolated, contact the Honeywell Technical Assistance Center (TAC).
All assemblies used in this module are likely to contain electrostatically sensitive devices.
Use personnel grounding strap and grounded work surfaces/equipment. Store and trans-
port parts only in electrostatically safe containers.
3.3.1 Power Supply/Fan
Refer to Figure 3-2. No LEDs light at all.
• Check power cord and power off-on switch.
• Replace power supply.
Red
power-status LED on or green
ERROR
• Replace power supply.
• If red LED is still on, check for shorted backpanel bus.
on.
FAN ALARM LED
Rotating parts. Keep fingers and other objects clear of fans.
• If necessary, loosen mounting hardware and slide module out of rack. Check fans. If
all fans are stopped, check the wiring to them.
• If one or more fans are stopped, replace fan assembly.
• Replace power supply.
• Check for missing or defective thermal sensors.
Multinode Module Service
CAUTION
LED off.
POWER OK
W A R N I N G
3-3
3.3
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Table of Contents
Troubleshooting
