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C O R P O R A T I O N
20.0
TROUBLESHOOTING GUIDE
20.1
If you encounter diffi culties in getting the converter modules or rack/shelf
to operate properly, go through the following troubleshooting guide.
20.2
Table 20-1. TPCMQ48/TPCMQ24 Converter System Troubleshooting
No output, Input Good and
Output Good LEDs off.
No output, Output Good
LED off, Input Good LED on.
No output, Output Good
LED off, Input Good LED on.
No output, Output Good
LED off, Input Good LED on.
No output, Output Good
LED off, Input Good LED on.
Low or no output, Output
Good LED off, Input Good
LED on.
SYMPTOM
POSSIBLE CAUSE
No input power.
Inhibit in OFF
mode.
Shorted output.
Overvoltage pro-
tection (OVP) has
latched.
Overtemperature
protection is
activated on one
or more converter
modules.
Output load is too
great for the num-
ber of converter
modules.
Check connection to DC source.
Check DC source circuit breakers.
Make sure J4 Pin 1 (Inhibit) is not
connected to Pin 23, -Sense, or to
ground.
Check for short and remove.
Reset output by cycling the DC input
OFF and then back ON.
Allow module to cool down for about
10 minutes. Check to see if the
cooling fans are operating.
Reduce load to proper level.
22
TPCMQ DC/DC CONVERTER SERIES
OPERATING MANUAL
ACTION TO TAKE
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