BERTHOLD TECHNOLOGIES Uni-Probe LB 490 - Page 219

Uni-Probe LB 490
BERTHOLD TECHNOLOGIES GmbH & Co. KG
2 – 219
Volume 2 4 Repair, Maintenance and Service
2
4.4.1 Function Check Digital Board
There are three LEDs on the digital board directly next to the RS-
232 connector.
Figure 4-1 Digital board LEDs
1. CPU LED
The CPU LED informs you if the CPU is working correctly.
– LED is flashing: CPU works correctly
– LED is flashing rapidly: CPU is working in the monitor mode
(software update)
– LED off: CPU malfunction, or no power supply
2. Communication LEDs
If a communication via fieldbus or HART
®
exists, both LEDs
(TxD, RxD) are flashing.
LEDs for communication
CPU LED