11 Troubleshooting 
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11  Troubleshooting 
Check KRN100 normal operation regularly.   
1 
When power ON, KRN100 does not 
display anything on LCD screen and 
operate.   
Check power supply and power connector is 
connected normally.   
2  Displayed date and time is not correct.   
KRN100 has date and time error within 
±2min/year (Useable until in 2100). Set date 
and time again.   
3  Sensor input value is not right.   
Check sensor input settings are correct in 
INPUT SETUP. 
Turn OFF the power of KRN100 and remove 
input cards from KRN100 and check jumper 
pin settings according to input specification.   
4 
KRN100 records former digital data not 
current time’s.   
Displaying record memory status icon (  
or  ) is the state of recording former 
digital data. 
Because there are lots of alarms and record 
events or recorded data is accumulated due 
to short memo period.   
To cancel former data recording, pause and 
re-start record.   
Change the settings about record for proper 
operation. 
5 
In graph mode, printout for line and letters 
is not clear and spread.   
Replace ink cartridge.   
6 
Recording paper’s terminal mark, red star 
shape, is displayed.   
Recording paper should be replaced. 
Present recording paper lefts only 330mm 
from terminal mark.   
7 
When power ON, after booting screen, 
KRN100 does not change normal 
operation screen.   
SD card of inner KRN100 has problem. 
Please contact our service center.   
8  USB memory is not recognized.   
USB memory’s file system supports only 
FAT16 and FAT32. Format as FAT16 or 
FAT32.   
If partitions of an USB memory are divided, 
KRN100 recognizes only first partition.   
9 
Cannot connect communication by 
Ethernet.   
Check communication line connection and 
reset it as following ‘8.4 COMMUNICATION 
SETUP (Communication setting)’.   
10 
Cannot connect communication by RS485 
communication.   
Check communication line’s A, B signal 
polarity is connected correctly. Reset it as 
following ‘8.4 COMMUNICATION SETUP 
(Communication setting)’.