Rohde & Schwarz M3SR Series 4100, Service Manual, Page: 100 / 138

R&S M3SR Series 4100 HF Transceivers Troubleshooting
6124.9007.82.01 4.8
4.2.3 Meaning of LED Indications on the Synthesizer
The red, yellow and green LEDs are provided for local diagnostics. All interrupts routed in this module
and the internal behaviour are indicated by the LEDs. For meaning of LED indications see Table 4.3.
Table 4.3: LED Indications
LED Meaning
Red LED – Error
The red LED is blinking slowly
(one on-off cycle per second,
50% duty cycle)
(green LED is off, red and
yellow LEDs may be blinking
simultaneously)
Module has not finished its module configuration, e.g.
initialization of components such as A/D converter of
temperature sensor.
Module has detected an error. Error means that the module
seems to have an hardware defect and must be repaired.
Yellow LED – Warning
The yellow LED is blinking
slowly (one on-off cycle per
second, 50% duty cycle)
(green LED is off, red and
yellow LEDs may be blinking
simultaneously)
Warning is detected. Warning means, that something in the
module is in an abnormal status, but the basic module tasks still
work (maybe with reduced functionality). Examples:
PLL for FPGA clock not locked
RF Overload at antenna connector
Temperature too high
Green LED – OK
The green LED is blinking
slowly (one on-off cycle per
second, 50% duty cycle)
(Red and yellow LEDs are off)
Everything is okay, no error has occurred