5-2
5
WARNING
If the fault isolation procedure requires internal measurements,
always remove power when disassembling or assembling the
unit. Use extreme caution during troubleshooting, adjustments,
or repair to prevent shorting components and causing further
damage to the unit.
TABLE 5-1 TROUBLESHOOTING GUIDE
Possible
Symptom
Fault
Action or Check
Symptom
Fault
Action or Check
Symptom
Fault
Action or Check
Unit will not turn on Power cord not
Push power cord into DC
Unit will not turn on Power cord not
Push power cord into DC
Unit will not turn on Power cord not
Push power cord into DC
PWR LED off
plugged in
receptacle
PWR LED off
plugged in
receptacle
PWR LED off
plugged in
receptacle
Power at AC outlet Check outlet and power
Power at AC outlet Check outlet and power
Power at AC outlet Check outlet and power
adapter
adapter
adapter
Wrong DC adapter
Use ICS supplied adapter
Wrong DC adapter
Use ICS supplied adapter
Wrong DC adapter
Use ICS supplied adapter
DC plug polarity
N4865A re polarity on
DC plug polarity
N4865A re polarity on
DC plug polarity
N4865A re polarity on
wrong
center pin.
wrong
center pin.
wrong
center pin.
All LEDs on
Internal fault
Check TP4 (3.3V) and TP5
All LEDs on
Internal fault
Check TP4 (3.3V) and TP5
All LEDs on
Internal fault
Check TP4 (3.3V) and TP5
(5 V) for proper voltage.
(5 V) for proper voltage.
(5 V) for proper voltage.
Return unit for repair
Return unit for repair
Return unit for repair
Unit shows blinking Self test fault
Refer to Self Test errors in
Unit shows blinking Self test fault
Refer to Self Test errors in
Unit shows blinking Self test fault
Refer to Self Test errors in
LEDs
Table 5-2.
LEDs
Table 5-2.
LEDs
Table 5-2.
ERR LED blinks.
Instrument communication
ERR LED blinks.
Instrument communication
ERR LED blinks.
Instrument communication
error. The N4865A is unable to
error. The N4865A is unable to
error. The N4865A is unable to
communicate with the LAN
communicate with the LAN
communicate with the LAN
instrument. Usually means no
instrument. Usually means no
instrument. Usually means no
response from the instrument.
response from the instrument.
response from the instrument.
ACT LED blinks
Normal operation
ACT LED blinks
Normal operation
ACT LED blinks
Normal operation
RDY LED blinks
The N4865A is looking for a
RDY LED blinks
The N4865A is looking for a
RDY LED blinks
The N4865A is looking for a
VXI-11.3 compatible LAN
VXI-11.3 compatible LAN
VXI-11.3 compatible LAN
instrument. If blinking con-
instrument. If blinking con-
instrument. If blinking con-
tinues more than 20 seconds,
tinues more than 20 seconds,
tinues more than 20 seconds,
check instrument connections
check instrument connections
check instrument connections
and its network settings. Be
and its network settings. Be
and its network settings. Be
sure it is VXI-11.3 compatible.
sure it is VXI-11.3 compatible.
sure it is VXI-11.3 compatible.
Summary of Contents for N4865A
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