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Defender 5000 Indicators Service Manual
5
REPLACING MAJOR COMPONENTS (INDICATOR)
Ohaus Indicators are precision instruments and should be carefully handled, stored in a clean, dry, dust-free
area, and cleaned periodically. Follow these precautionary steps:
–
When an Indicator has had chemicals or liquids spilled on it, all exterior surfaces should be cleaned
as soon as possible with warm water on a damp cloth.
–
Allow at least 10 minutes for the Indicator to stabilize after moving it from an area which is at a
different temperature than the area where it is to be operated.
5.1 Printed Circuit Board (PCB) Replacement
Repairs are not recommended on the PCB. Replacement is recommended rather than repairing.
Replace the PCB for any of the following reasons:
– Display is defective; characters missing or partial display.
– Indicator fails to calibrate properly.
– Display is erratic or unstable.
– Certain functions are not operational.
– Indicator does not operate at all.
5.1.1 TD52P
1. Unplug the Indicator from the AC power source.
2. * If the indicator comes with the optional RS232 kit kindly remove from the bottom
housing via removing 2 screws and the cable to the PCBA.
3. Remove the four screws from the Bottom Housing and U bracket.
WARNING: Electric Shock Hazard. Disconnect the Indicator from power before
servicing.
CAUSION: Observe precautions for handling electrostatic sensitive device.
