UNI-T UT321 User Manual Page 53

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<Toc> <4. Troubleshooting and Maintenance>
4-1
IM 05D01D12-41E 6th Edition: Mar. 25, 2005-00
4. Troubleshooting and Maintenance
4.1 Troubleshooting
Troubleshooting Flow
If the operating display does not appear after turning on the controllers power, follow the
measures in the procedure below.
If a problem appears complicated, contact our sales representative.
Ask the vendor for repair.
Find the cause.
Totally
inoperable?
Yes
Yes
Yes
No
No
No
Is key
operation
faulty?
Yes
No
Yes
Check wiring on the
power supply
terminals.
Check the key lock
setting.
Is display
faulty?
Yes
No
Turn off power, and
then turn it on again.
Is I/O
signal faulty?
Yes
No
Check the
instruments I/O
specifications.
Check the supply
voltage.
Check the specifications
of I/O counterpart for
wrong polarity.
Check the
communication-related
parameters.
Check the specifications
of communication
counterpart.
Check
communication wiring.
Is
communication
link faulty?
No
Does the code
include a communication
option?
Yes
Normal?
Is
key lock
enabled?
Check the
instrument's suffix
code.
Yes
No
Correct?
Correct
errors.
Disable
key lock.
No communication
capability.
Is the instrument
defective?
IMPORTANT
Take note of the parameter settings when asking the vendor for repair.
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