Trouble Shooting Guide
Symptom Solution
The display is blank
• The DP700 maybe in sleep mode. press any key to exit sleep mode
• Check that the power supply is correctly connected to a working mains outlet
• Check that the power supply cables are not damaged
• Check that the power supply voltage is 15 - 24Vdc ±10%
• Check the power supply indicator is illuminated on the front of the DP700.
The display works, but
resets from time to time with-
out any keys being pressed.
Either the supply voltage is too low, or the power supply or mains supply has an intermittent fault.
• Check that the power supply voltage is 15 - 24Vdc ±10%.
• Check that all the connections are secure.
The display works, but gives
erratic readings,
the last digit jitters or the
measurements jump to
new figures unexpectedly.
There may be a poor earth (ground) connection. Both the DP700, and the machine on which it is
installed, must have proper earth (ground) connections.
There may be a problem with the encoder.
The unit does not respond to
any key presses.
Disconnect the DP700 from its power supply, wait 15 seconds and then reconnect.
‘no Sig’ or ‘SIG FAIL’
appears in the display.
This indicates that the unit is not receiving a proper signal from the encoder.
• Check that the encoder connections are secure.
• Check that there is no damage to the connectors or to the encoder.
• Switch the DP700 off and back on again.
• Swap the encoder to another axis to confirm whether the encoder or the DP700 is at fault.
Readings are incorrect.
• Check the Encoder Type to ensure it is correct.
• Check the Radius / Diameter setting. The Diameter setting causes the axis to read double.
• Check the Error Compensation factors.
• If using the Segmented Error Compensation, verify the datum position.
• Swap the encoder to another axis to confirm whether the encoder or the DP700 is at fault.
• Check that there is no damage to the encoder or its cable.
• Check that the encoder is fixed firmly and aligned correctly, as described in the Spherosyn /
t t
Microsyn Installation manual.
• Check that there is no binding on the scale. With the scale brackets slightly loosened, you
t should be able to slide the scale back and forth with minimal resistance.
• If you have a Spherosyn scale, check that the scale is not bent, by removing it and rolling it
on a flat surface.
If the solutions suggested above do not solve your problem, contact Newall for further instruction.
To swap encoders to trace a fault:
1. Check that the two axes are set to the correct encoder types.
2. Disconnect the DP700 power supply.
3. Disconnect the encoder from the malfunctioning axis and move to a working axis.
4. Reconnect the DP700 power supply and turn on.
If the fault stays with the same encoder, then the encoder is at fault. If the fault does not follow with the encoder
the DP700 is at fault.
Providing you have not moved the machine more than 6.3mm (0.25”) for a Spherosyn Encoder or 2.5mm (0.1”) for a
Microsyn Encoder, switching the power off and back on again does not lose the datum position.
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