CIRCUIT DESCRIPTION
V E R T I C A L SECTION . , .. . , . . /
T h e , input "signal applied -.to;;; V..- I N P U T - passes through the
D C coupler (DC) or A C coupler incorporating a capacitor
( A C ) and is then fed to the attenuator; the selection
between the D C coupler and A G coupler is effected by
manipujating V . I N P U T terminals. T h e attenuator provides
setting of 1 , 1/10 or 1/100.so that the input signal may be
attenuated . t o a certajn - range.,-of voltage that can be
accepted by the .vertical amplifier, , , ..
The vertical amplifier is a direct-coupled differential ampli-
fier consisting of F E T Q 1 and silicon transistors
;
Q2. ~ Q 5 ,
allowing stable DC amplification.
HORIZONTAL SECTION
The horizontal section is composed of the synchronizing
input voltage limiting circuit Q 6 , time base sawtooth wave
generator Q7 ~ Q 1 0 , horizontal amplifier Q12 ~ Q14 and
the blanking voltage amplifier Q 1 1 .
The synchronizing input voltage limiting circuit suppresses
the synchronizing signal, "picked up from the emitter of Q 5
at the final stage of the vertical amplifier, to a constant
level which is then applied to the sawtooth wave generator,
thus assuring stable synchronization. .
The sawtooth wave generator includes the diode D1 for
stabilizing the DC level, while the multivibrator consisting
of Q7 and Q8 generates sawtooth waves. Transistor Q 9
inserted in the emitter circuit of transistor Q 8 is a current
limiter which improves the linearity of the sawtooth waves.
Transistor Q 1 0 inverts the polarity of sawtooth waves,
perform ing negative-to-positive going sweep so as to meet
the requirements-,in relation to the number of the hori-
zontal amplifier stages which follows.
The horizontal, .arnpjfier is a one-stage direct-coupled
differential amplifier consisting of F E T Q 1 2 and silicon
transistors Q 1 3 and Q 1 4 . T h i s configuration ensures stable
D C amplification. T h a t is, a very low speed of sweeping
below 1 Hz can be achieved through H. I N P U T terminal
( 8 ) . / . , / . . ; . . . . ' . .
In the blanking voltage amplifier, the negative going pulses
from the Q8 collector are amplified to positive going pulses
which are then applied to the cathode of C R T , thus
blanking over a range from 10 Hz to 100kHz for ease of
observation on the C R T screen.
POWER SUPPLY CIRCUIT '
The power supply circuit pr8 V and —15 V through
the voltage stabilizer consisting of zener diodes D2 and D 3 ,
in addition to 180 V (approx.) through the full-wave
rectifier composed of the diodes D 6 and D7 to supply to
the collector circuit o f the final stage of each amplifier.
HIGH
- V O
L T
A G E
; P O W E
R
:
SO
PPL
Y
CIRCUIT
Thiscircuit^supplies —1500 V through the full-wave voltage
doubter rectifier composed of the high voltage diodes D1
and-02 tothe•••CRT•circuit;""'
v
DC
GND
H J N P U T i
GND
X65-1080-00
Attenuator
S l a . b
Synchronizing
voltage frmitet
0 6
F U S E
0 . 3 A
S 3
Input circuit
01
Saw-tooth
wave
oscillator
S 2 a - e 07 - 10
Power fransformer,
primary side
Vertical ;
amplifier
0 2 - 5
Blanking
circuit
01
i
Horizontal
/amplifier
0 I 2 ~ 14
Power
supply
D2 - 7
X68-1130-00
High voltage
supply
Dl ,2
Fig.
1
B L O C K D I A G R A M O F CO-1506
3
V. I N P U T
A C
- 15V
f
8
V
4-
1 8 0 V
- 1 5 0 0 V
C R T
1 3 0 B E B 3 1