Troubleshooting / Cleaning
Newall Measurement Systems
42
TROUBLESHOOTING
9.0 TROUBLESHOOTING
Symptom Solutions
10.0 CLEANING
Disconnect the DSU from the power supply before cleaning.
It is recommended that the DSU and Display/Keypad be wiped over with a lint-free cloth with a non corrosive,
non abrasive cleaning fluid.
Do not use compressed air.
1 Nothing happens when the unit is
switched on. Even the switch
lamp is off.
Check that the unit is correctly connected to a working power source.
Check the power lead is not damaged.
Check the selector switch on the DP8 DSU is set to accept the correct
power supply voltage.
Check the fuse. Note that if the fuse has blown, this suggests a fault
with the power source which must be corrected before the fuse is
replaced. (See Section 2.2)
3 When the unit is switched on the
displays are frozen.
4 The displays work, but reset from
time to time without the keys
being pressed.
5 The displays work, but give erratic
readings, the last digit jitters or
the measurements jump to new
figures unexpectedly.
6“SIG FAIL ” appears in the display.
7 The unit will not respond to keys.
This suggests that voltage of the power is too low.
Check that the power source is within the limits accepted by the unit.
(See Section 2.2)
This suggests either that the voltage of the power source is too low,
or that the power source has an intermittent fault.
Check the power source as above.
Check that all connections are sound.
This suggests that the there is a poor earth (ground) connection. Both
the DP8 unit itself, and the machine on which it is installed, must have
proper earth (ground) connections. (See Section 2.1) See also solutions
to 6.
Check that the transducer connection is good.
Check that there is no damage to the connectors or to the transducer
lead. If only one axis is displaying this message, connect the transducer
from a working axis into the faulty axis. If the same message appears,
the fault is likely to be in the DP8 unit and you should contact your local
dealer. N.B. The unit must be switched off then on again to remove
the “SIG FAIL" message.
Switch the unit off and back on. Check the cable and connections
between the DSU and Display/Keypad.
2 The switch lamp is on but nothing
happens
Check the cable and connections between the DSU and
Display/Keypad.
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