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14
SC20
A baord
UHZ
19
Inverter
(IC16563)
5V
This is the Feedback signal to
discharge control IC on A board.
The discharge control IC
adjusts the timing for
sustaining drive pulse switching.
(If no feedback, 6 blinks will occur)
discharge control IC on A board.
The discharge control IC
adjusts the timing for
sustaining drive pulse switching.
(If no feedback, 6 blinks will occur)
Monitor VFG ( feed back to control IC)
Comparator
(IC16920)
+
-
16V_F(15.8V)
2.61k
2k
33k
47k×5
= 235k
VFG
6.8V
Vad
Vad
Vad
GND
16V_F(15.8V)
10k
2.2k
22k
If this voltage drops below 7.3V (from Vad)
=VFG drops below 60V (from Vad),
the output of comparator is changed to Low.
=VFG drops below 60V (from Vad),
the output of comparator is changed to Low.
Comparator
(IC16491)
+
-
5V
2k
10k
130k+120k+150k
= 400k
VFG
2.48V
47
CERS
K
A
REF=2.5V
680
5V
10k
10k
47k
If this voltage is rises than 2.5V (from GND)
=VFG rises than 105V (from GND),
the output of comparator is changed to Low.
=VFG rises than 105V (from GND),
the output of comparator is changed to Low.
Vad
IC16490
Shunt
REG
VFG
Step4. Check the Feedback Circuit
The value is one example of 42G10 product.
(Vad and Resistor are different by each model)
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