11.2 Cleaning
180
Before Returning for Repair
If abnormal operation occurs, check the following items.
Symptom Check Items
The display does not ap-
pear when you turn the
power on.
• Is the power cord disconnected?
• Are connections made correctly?
Verify that the power cord is con-
nected properly.
(p. 22)
Keys do not work. • Is any key being held down?
• Is Key-Lock enabled (M.LOCK or F.LOCK dis-
played)?
• Is remote control communication enabled (RMT dis-
played)?
• Is the EXT I/O KEY_LOCK signal asserted (Low
level)?
Verify key operation.
Cancel Key-Lock (p. 60)
Switch to local control (p. 104)
De-assert the KEY_LOCK
signal
(High level).
Measured values are
unstable.
• Is the measurement object a power transformer or
other large inductance?
• Are the cables and measurement object adequately
shielded?
"Appendix 3 Unstable Measure-
ment Values" (p. A3)
Measured values are
shifted.
• Is zero-adjust enabled?
• Are the CUR and POT terminals connected before
contacting the measurement object?
• Is the measured object calibrated correctly?
• Is the GUARD terminal drawing more than 10 mA?
(the GUARD terminal shield may be contacting a
BNC terminal)
• There may be a large thermal emf.
"3.6 Zero Adjustment" (p. 32)
If the cause is unknown • Try performing a system reset (p. 67). All settings are returned to their factory defaults.)
11.2 Cleaning
• To clean the instrument, wipe it gently with a soft cloth moistened with water or mild deter-
gent. Never use solvents such as benzene, alcohol, acetone, ether, ketones, thinners or
gasoline, as they can deform and discolor the case.
• Wipe the LCD gently with a soft, dry cloth.
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