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11
SC20
A baord
SOS7
Buffer
(IC16561)
Buffer
(IC16562)
nCE
main_stop0
5V
15V
Vscn
12k×3
=36k
220k
(5.1V)
15V
(33V)
(36V)
Vscn = Vad+148V
=－195V+148V
=－47V
150k
150k
27k
Buffer
(IC16561)
SC_FPGANRST
21
26
AA_SC_FPGANRST
(Normal = Low)
Normal = on
Vscn = Vad + 148V
Normal =
red flow ( -69V < Vscn < -28V )
If Vscn rises than (-33+5.1=) -28V,
blue current flows
If Vscn drops below (-33-36=) - 69V,
green current flows
Change to High
by blue current = In case of low Vscn
by blue current = In case of low Vscn
Change to High
by green current = In case of high Vscn
by green current = In case of high Vscn
(Normal = Low)
Monitor Vscn / Vad / 15V_F / 5V_F_A
Q16876
4.7k
4.7k
D16871
D16821
D16874
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Step4. Check the SOS Circuit ( SOS7-1 ）
If this signal stays high(5V),
7 blinks will occur.
So if one of the anode side
of D16480/16820 stays
high, 7 blinks will occur.
D16480
D16820
D16820
The value is one example of 42G10 product.
(Vscn / Vad and Zener diode are different by each model)
Please check the accurate value by Service Manual.
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