Pwr (16P0211A) - Furuno FS-1575 Service Manual

2. PWR (16P0211A)

Input voltage
• Switching power supply with an input voltage range of +10.8 to +31.2V
Output voltage
• +6.5V, +3.3V, and +5.0V
• VH1 and VH2: LCD block power supply
Protection circuit
• Protection against reverse connection of power supply: Provided
- Mount a diode to the power supply input block to melt down the fuse of power
supply cable.
• Over-voltage protection for input power supply: +32 to +37V
• Low-voltage protection for input power supply: +7.5 to +8.5V
• Over-current protection: Provided
DCIN
L1
(LINE FIL)
Low Volt
Hi Volt
U11:Voltage
Monitor
Q1,CR2
(10V AVR)
Power SW
circuit
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.
T3
CR53,54,C53
(REC)
U21
(SW Drive)
T4
CR52,C52
(REC)
CONT
E2
U13:PWM
(Controller)
DTC IN2
MB3759PF x 3
Vcc IN2 p IN3 OC3 E3 RT
130k ADJ
CONT
U22
(SW Drive)
R33
U12:
(PWM CONT)
OUT2
U23:
Over Current
OUT1
DET
Fig. 7.10.5 PWR Board Block Diagram
7-100
Q1010194,
T101,102
(LCD Drive)
TP10
+9V
TP11
U52,16
(DET)
CR41,42,C47
Not used
(REC)
T5
CR43,C48
(REC)
T6
CR44,C49
(REC)
U17,53
(DET)
7.10 NBDP Terminal
J5
VL
VH1
VH2
#1
#2
#3
J6
+5V
#3
CFL CTRL
#1
#4
#6
TP9
+7V
TP7
+6.5V
#7
TP8
+3.3V
#5