— 4 —
Figure 1
CIRCUIT DESCRIPTION
Name
Voltage
Function
VCC2-1
4.50
±
0.02 V
Main voltage
VCC7
25.9 ~ 31.3 V
Tuning voltage
VCC6
10.0 ~ 12.0 V
Display voltage
VEE1
–8.0 ~ –7.0 V
Display voltage
VEE2
–18.4 ~ –16.0 V
Display voltage
Table 1
The power supply consists of a DC-DC converter and the associated circuit and supplies the voltages as shown
in Table 1.
POWER SUPPLY
CP105
R108
270K
R110
270
Q110
2SD1819A-R
Q111
2SD1119-R
C137
R107
D100
MA141K
33K
B6800p
C140
CH470p
R115
100
6.3 V 220
C100
D110
MA3051-L
2.2
BH102K
TM100
Q101
2SD1819A-R
2.2K
R113
R105
3.3K
VR100
2K
C105
C145
B1500p
CP106
1
2
9
6
3
4
5
6
7
8
T100
LC12U-35
D158 MA143A
R160
68
C146
OPEN
D156 MA141K
D154 MA142WK
D150
MA142WK
D152
MA142WK
L101
100u
L103
100u
CP110
CP111
CP113
CP114
CP115
C110
25 V 10
C112
16 V 47
C114
6.3 V 100
C116
6.3 V 100
C118
16 V 22
C120
35 V 22
R161
33K
VEE2 (-18.4 ~ -16.0 V)
L102
100u
R100
0R00
GND
CP112
1
2
3
VEE1 (-8.0 ~ -7.0 V)
VCC2-1 (4.5 V)
VCC6 (10.0 ~ 12.0 V)
VCC7 (25.9 ~ 31.3 V)
VCC2-2 (4.5 V)
VCC2-3 (4.5 V)
