5-5
5
TABLE 5-2 TROUBLESHOOTING GUIDE
Possible
Symptom
Fault
Action or Check
Unit will not turn on
Power supply not
Check for AC power at the
plugged in
5 volt power supply.
Power on card
Check power at testpoints on
the card. Power must be 4.8 to
5.2 Vdc.
High output lines
Disconnect output signals
shorted to ground
and reapply power to test the
unit. If it powers on, remove
the short and put resistors in all
loopback circuit paths.
Unit shows a blinking
Self test fault
Check Self Test errors in
LED at power turn
Table 5-1
on
ERR LED on at
Flash data lost
Use *CLS to clear the LED.
power turn-on
Use CAL:DATE command to
accept default configuration
and clear the error so the ERR
LED will not come on at next
power-on time.
Reload your configuration and
use the *SAV 0 command
to save the new configuration.
LEDs do not show an
External address
Connect or jumper a switch
address at power
enabled but no
input to ground. Recycle power
turn-on
switch connections
or reset the unit.
Internal address set
Short the DEFAULT jumper
to zero
W1 and reset the unit to restore
the address to 4. Remove the
jumper and set the address to a
nonzero value
External address
Unit not reset after
Reset the unit or recyle power.
changed but the unit
the address change
The unit only reads the external
did not respond to the
address at power turn-on.
new address
