Maintenance; Adjustment; Line Voltage Check; Jumper Setting - Furuno Satellite Compass SC-50/110 Service Manual

6. Maintenance

6.1 Adjustment

1) PWR board
Switching regulator frequency is adjusted on PWR board, 20P8181 as below.
Test Point
TP2
TP5
2) MAIN board
Vcc-c supply voltage to Rate sensor is adjusted by VR96 on MAIN board, 20P8178.
Test Point
#1 of J20

6.2 Line voltage check

Line voltages are checked at J3 on the MAIN board.
Line voltage
3.3 V
5.1 V (5 V)
6.5 V
13.5 V (15 V)

6.3 Jumper setting

Jumper JP1 on the MAIN board is used at factory to set the MAIN board to A or B version.

6.4 LED

CR3 on the MAIN board blinks when the CPU is running.
GND
TP1 120.0 kHz ± 10 kHz
TP3 120.0 kHz ± 10 kHz
GND
#2 of J20
Test Points on MAIN board
#4 (+) and #5(-) of J3
#1 (+) and #5(-) of J3
#8 (+) and #5(-) of J3
#7 (+) and #5(-) of J3
12
Rating
Rating
5.0 V (Vcc-c)
Rating
3.15 to 3.45 V
4.94 to 5.46 V
6.2 to 6.8 V
12.5 to 14.4 V
Adjuster
VR79
VR80
Adjuster
VR96