User manual

1 Publication 1760-UM001A-EN-P
Chapter 9
Troubleshooting
You may sometimes find that Pico does not do exactly what you expect. If this
happens, read through the following notes which are intended to help you solve
some of the problems you may encounter.
Use the power flow display in Pico to check the logic operations in the Pico circuit
diagrams with reference to the switching states of contacts and relays.
Only qualified persons should test Pico voltages while the device is in operation.
Messages from the Pico
System
Pico System
Messages on the
LCD
Explanation Remedy
No display Power interrupted Turn on the power
Pico LCD faulty Replace Pico
Continuous display
TEST: AC Self-test aborted Replace Pico
TEST: EEPROM
TEST: DISPLAY
TEST: CLOCK
ERROR: I2C Memory module removed or not inserted
correctly before saving
Insert memory module
Memory module faulty Replace memory module
Pico is faulty Replace Pico
ERROR: EEPROM The memory for storing the retentive values
or the Pico circuit diagram memory is faulty.
Replace Pico
ERROR: CLOCK Clock error Replace Pico
ERROR: LCD LCD is faulty Replace Pico
ERROR: ACLOW Incorrect ac voltage Test the voltage
Pico is faulty Replace Pico