Kenwood FG-273 Service Manual page 12

G
H
I
COUNTER PRE-AMPLIFIER
I
NOTES:
D1-48 1N4148 D69 LED, RED 08,9
D49 1N4747A D70-73 1N4148 Q10
D50 1N4148 D74-77 1N4001
Q11
D51 LED,RED D80,81 1N4001 012
D52,53 1N4148 D82 R08.2EB2 013
D54 LED.RED 01 2SC1815GR 016
D55-60 DISPLAY Q2,3 2SA1015GR 017
D61-65 1N4148
Q4
2SC1815GR 018
D66
LED, RED Q5
ZN5485 019
067,68 1N4148 Q6,7 2SA1015GR 020,21
11
J
2SC1674K
2N3906
2SC1674K
2N2219A
2N2905A
7815
TIP32B
8050C
2N3906
2SC1815GR
SCHEMATIC DIAGRAM
022
Q23
024
025-27
028
029
U1,2
U3,4
U5
us
K L
I
MAIN
BOAR0-25-~
T1
2SA1015GR U7
2SC1815GR U8
7805
us
2SA1015GR U10,11
2N5485 U12
2SC1815GR U13
741 U14
308 U15
3086
U16
7420N
ov
6
E
7426N
3030
741
358
741
72160
14066
10116P
741
I
I
I
M N
p
CD
1/ \ I 1\
1/ \ I \
1
- - - - - - - - ,
: I•15V
REGULATOR
I
i
I--~-~~...-~-~1S6V
0. 5 V/d I v 0. 2 ms/d i v
1 V/d I v 0, 2 ms/d I v
Y\
V\
/ " / 1\.
/ '\. / 1\.
0,5V/div 0.2ms/div
FUNCTION • SINE
1'\. /'\. /
1\ I \ I
\ I \
v
0.5Y/dlv 0.2ms/dlv
@)
[LINEAR]
SWEEP RATE ' CW
v \
. . . . . . -"'I\
v
/ \
/
5 V/d I v Zmo/dlv
@) [LOG]
SWEEP RATE : CCW
1
n
v
I
v
I
5 V/d I v 1 s/d I v
INPUT SIGNAL f=tkHz
1\
/ \
\
I
\
I
I\. I
I
0.1V/dlv O.Zms/dlv
12
GND
GND
GND
QND
GNO
GND
+1. 7V
II
I
I I
--
f - f -
0.5V/dlv 0,2ms/dlv
1 ·V/d I
v
0. 2 ms/d I
v
0
ro
II
\
I
\
v
\..V '
;
0.1V/dlv 0,2ma/dlv
@
FUNCTION • SINE
AMPLI TltDE ' M.AX
\ 1/1"\ /
\ I 1\
I
5V/div 0.2ms/div
[LOG]
SWEEP RATE • CW
/
/I
\ / v
5 V/d i v 2ms/d i v
SWEEP RATE • CCW
f -
-
........ ........
'\
\1
1 V/d I v 1 o/d I v
r-1--f-- r - -
-
I il
I I
I I
1V/dlv 0.2ms/dlv
GND
QND
GND
QNO
GND
ONQ
GNO
I
I 1\ I \
GNO
/
'\V
\
0,5V/div 0,2ms/dlv
FUNCTION • SQUARE
GND
0,5Y/dl.v 0,2ms/dlv
i'\ 1/ '\
1/
GND
\
I
1\
I
0, 5 V/d I v 0, 2 mo/d I v
@
SWEEP RATE ' CCW
/
v
/ /
/ /
/
GNO
'/
2 V/d I v 1 s/d I v
@) [LINEARl
SWEEP RATE • CCW
...--- I
v~-"'
v
I
v
QNO
......
5 Y/d I
v
1 a/d I v
SWEEP RATE ,. CCW
/) VI
QNO
I
......
I
5 V/d I v 1 u/d I v
\ I 1\ I \ I \ I \ I
\ I \ I \ I \ I \ I
\II \II \1 \ I \II
GNO
1V/dlv 0,05,us/div
13