Unbalance; Vc [V]; Ic [A]; Pa-Vf - Furuno FS-1575 Service Manual

7. UNBALANCE

This self-check menu is used to numerically display the UNBALANCE signal of the
COMB circuit as part of the PA board test. If the detected signal level is not lower than
the threshold, it will be displayed in "red."
For details, refer to information on page 6-13.

8. VC [V]

This self-check menu is used to display the collector voltage of PA transistor of the PA
board. The voltage is detected in the detection circuit of the PA board. If the detected
voltage level is not higher than the threshold, it will be displayed in "red."
The "VC [V]" column displays a voltage converted from an ADC value.

9. IC [A]

This self-check menu is used to display the collector current of PA transistor of the PA
board. The current is detected in the detection circuit of the PA board. If the detected
current level is not higher than the threshold, it will be displayed in "red."
The "IC [A]" column displays a current converted from an ADC value. For details, refer
to information on page 6-12.

10. PA-VF

This self-check menu is used to display V-SWR: "VF" on the PA output side of the PA
board. If the detected voltage level is not higher than the threshold, it will be displayed
in "red." For details, refer to information on page 6-12.

11. PA-VR

This self-check menu is used to display V-SWR: "VR" on the PA output side of the PA
board. If the detected voltage level is not lower than the threshold, it will be displayed
in "red." For details, refer to information on page 6-12.

12. PA-TEMP

This self-check menu is used to detect temperature with U7 mounted in the vicinity of
the PA transistor on the PA board and numerically display this detected temperature
level. The signal name is "TEMP PA" 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
6-18
6.2 SERVICE: SELF CHECK
*** Calculation Equation ***
V = 3.3 × (ADC value/4096)
°C = {(V × 1000) − 424}/6.25