Furuno FAR-2107 Series Service Manual page 361

PROCESSOR UNIT MONITOR
Monitor for the Processor unit: RPU-013.
Display
-12 V -12 VDC output on the PWR board.
3.3 V +5 VDC output on the PWR board is converted into +3.3 VDC and displayed.
5 V +5 VDC output on the PWR board.
12 V +12 VDC output on the PWR board, which is adjusted by R26.
Antenna motor output voltage on the PWR board. +24 VDC antenna motor
voltage is displayed by X-band radar. The power supply to the antenna motor uses
a feedback circuit, which detects the antenna revolution speed and make the
revolution constant. Accordingly the voltage changes depending on wind pressure
applied on the antenna and voltage drop on the antenna unit cable. The voltage is
SCANNER
generally +21 VDC to +27 VDC.
MOTER
Note:
Both S-band radars and X-band radars output the antenna motor power of +24
VDC outputted from the PWR board. The S-band radar, however, do not use
the antenna motor power.
Fig. 6.1.4 Diagram of Processor Unit Monitor
Table 6.1.3 Display of Processor Unit Monitor
Description
6-5
6.1 Self-test