KYORITSU 4105A - Manual (Page 10)

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9. Before Sending for Service
If this instrument should fail to operate correctly, return it to your nearest
distributor stating the exact nature of the fault. Before returning the
instrument follow the trouble-shooting guide shown below.
If the instrument does not turn on;
Check whether batteries are missing or they are installed incorrect
polarity. Note that batteries were not installed in the instrument at the time
of shipment.
If the display reads ' 1 . . . ' in earth voltage measurement;
A voltage exceeding 200V is being applied to the instrument.
Halt the measurement immediately, otherwise the instrument may be
damaged.
If the display reads ' . . . ' in normal earth resistance measurement;
Stick the auxiliary earth spikes deeper into the earth, or stick them at other
locations; or
Add moisture to the part of the earth where C auxiliary earth spike is stuck
( connected with the red wire ); and
Short the three test leads and check if the display indicates a value near
' 0.00 '. (See section 6 for details.)
If the display reads ' . . . ' in simplified earth resistance measurement;
Check if the connection to a metal water pipe, a common earth of
commercial power supply, etc., is secure; or
Use another metal water pipe, common earth of commercial power
supply, etc.
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10. Service
If this instrument should fail to operate correctly, return to your nearest
distributors stating the exact nature of the fault.