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Q Q
3 7 6 3 1 5 1 5 0
6-18. SCHEMATIC DIAGRAM – FL Board –
R925
0
R924
100
T E
L
1 3 9 4 2 2 9 6 5 1 3
R923
100
R922
10k
T921
INVERTER
TRANSFORMER
Q921
2SC4357
OSC
Q922
2SC4357
OSC
w w w
HCD-HPR90/HPR99XM
• See page 36 for Waveforms. • See page 37 for IC Block Diagrams.
FL901
FLUORESCENT INDICATOR TUBE
R926
0
C927
0.1
D925
UDZSTE-176.2B
C926
47 50V
C925
0.01
D921
MC2840
23
SG10
24
SG11
25
D922
SG12
MC2840
26
SG13
4
1
27
SG14
28
SG15
29
SG16
VEE
31
5
9
GR1
32
GR2
33
GR3
C922
0.01
L921
R921
2.2k
C921
22
C903
16V
100p
x
a o
y
.
i
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8
C913
C912
22
0.1
16V
Q
Q
3
7
6
3
K2
K1
C909
FLUORESCENT
STB
C908
INDICATOR
CLK
TUBE DRIVER
C907
DIN
IC901
PT6315
DOUT
DSC
LED4
LED3
LED2
LED1
u 1 6 3
.
33
33
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2
4
9
9
8
1
5
1
5
0
8
9
2
4
R911
100k
+3.3V
R910
100k
DGND
100p
R909
100
FL STB
100p
R908
100
FL CLK
0.001
R907
100
FL DATA
R906
470k
LED DIRECT
R905
100k
LED DSGX
+6.2V
DDC GND
R902
100
R901
100
m
C944
0.1
c o
HCD-HPR90/HPR99XM
2
9
9
9
8
2
9
9
(Page 23)
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