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12
SD board
SD board
main_stop0
5V
5V_F_A
VFG
K
A
REF
3.9k
2.2k
VFG
5V_F_A
(5.1V)
4.7k
5V_F_A
15V_F
15V_F
SCNR_PRO
CHA
5.6k
10k
1k
(20V)
VFG
VFG
SU board
SU board
VFG
Normal = off
560
1k
VFG
SC50
1
2
Normal = on
(Normal = Low)
If REF drops below 1.26V,
Current stops from K to A.
(= If Q16471 on ,or SCNR_PRO change to Low,
or 5V_F_A drop )
Then photo coupler changed to off, and
main_stop0 signal changed to high.
Current stops from K to A.
(= If Q16471 on ,or SCNR_PRO change to Low,
or 5V_F_A drop )
Then photo coupler changed to off, and
main_stop0 signal changed to high.
If 15V_F exceeds than
20V (from VFG),
Tr(Q16471) is on.
20V (from VFG),
Tr(Q16471) is on.
If the loop of
CHA line cuts,
Tr(Q16471) is on.
CHA line cuts,
Tr(Q16471) is on.
K
A
REF
If REF input is higher than
reference voltage(1.26V),
current flow from K to A.
reference voltage(1.26V),
current flow from K to A.
PC16480
(Photo coupler)
(Normal = High)
5V_F_A
Q16471
IC16471
Shunt
REG
Step4. Check the SOS Circuit ( SOS7-2 ）
Monitor Vscn / Vad / 15V_F / 5V_F_A
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