NEC FP1355 Service Manual page 9

Waveform 1
(Refer to P1-11.)
L902
L903
PG
IC901
MC33262P
Zero current detector
Delay
Current sense
comparator
3
6
PG PG
PG
6 5 4 3 2 1
7 8 9 10 11 12
PG
+
1.2V
+
+
-
1.6V/
1.4V
UVLO
2.5V Reference
voltage source
16V
Timer R
RS latch
+
+
-
Overvoltage
Vref
comparator
+
+
-
1.08Vref
Error amplifier
10 ˚A
+
Multi plier
-
Quick
start
2
PG
Figure 2. High harmonic waveform circuit
1 - 3
D933
Figure. 1
(Refer to P1-2.)
8
Q902
36V
5
6.7V
Waveform2, 3
+
(Refer to P1-11.)
+
-
13V/
8.0V
Q901
10
7
R912
Drive
output
10
4
20k R909
10pF
+
Vref
1
D902
PG PG
PG
2.5V
400V
DC
+
PG