Vs [V]; Tx If In; Tx Rf Out; Drv Vf - Furuno FS-1575 Service Manual

1. VS [V]

This self-check menu is used to check for 24V power supply voltage inputted in the
FS-xx75T unit. The voltage is detected in the detection circuit of the PA-IF board. If the
detected voltage level is not higher than the threshold, it will be displayed in "red." The
"VS [V]" column displays a voltage converted from an ADC value.

2. TX IF IN

This self-check menu is the same as "CODEC" of the "TX SELF TEST" menu and used
to numerically display the detected IF CHK signal of the TX board. If the detected
signal level is not higher than the threshold, it will be displayed in "red."
For details, refer to information on page 6-9.

3. TX RF OUT

This self-check menu is the same as "TX" of the "TX SELF TEST" menu and used to
numerically display the detected RF CHK signal of the TX board. If the detected signal
level is not higher than the threshold, it will be displayed in "red."
For details, refer to information on page 6-10.

4. DRV VF

This self-check menu is the same as "DRV" of the "TX SELF TEST" menu and used to
numerically display the detected CHK DA signal of the DRV board. If the detected
signal level is not higher than the threshold, it will be displayed in "red."
For details, refer to information on page 6-11.

5. DRV VR

This self-check menu is the same as "DRV" of the "TX SELF TEST" menu and used to
numerically display the detected VR DA signal of the DRV board. If the detected signal
level is not higher than the threshold, it will be displayed in "red."
For details, refer to information on page 6-11.

6. DRV TEMP

This self-check menu is used to detect temperature with U3 mounted in the vicinity of
the PA transistor on the DRV board and numerically display this detected temperature
level. The signal name is "TEMP DA" in the circuit diagram.
The numerical display color does not change.
CONFIDENTIAL (internal use only)
This confidential document is used only by FURUNO authorized persons.
It is strictly prohibited to reproduce the document in whole or in part without prior written permission of FURUNO.
U3: LM60CIM3_NOPB
6-17
6.2 SERVICE: SELF CHECK
*** Calculation Equation ***
V = 3.3 × (ADC value/4096)
°C = {(V × 1000) − 424}/6.25