P R E C A U T I O N S
1 . Do not expose the unit to direct sunlight.
2 . Install the unit in a cool, dust-free place.
3 . Avoid installing the unit in locations subject to vibra-
tions, strong electric fields and impact voltages.
4 . Do not apply input voltage exceeding their maximum
ratings.
T h e input voltage applied to the vertical amplifier
should not e x c e e d 6 0 0 Vp-p or 3 0 0 V (DC + A C
peak), E X T C L O C K is up to 2 0 V and the input to E X T
T R I G is up to 2 0 V ( D C + A C peak).
Do not connect external voltage to any output ter-
minals.
5 . Do not increase the intensity more than necessary.
6. W h e n the unit is to be left unused with the bright spot
on the screen, turn down the I N T E N S I T Y control and
F O C U S control.
7. T o prevent electrical s h o c k s , be sure to connect the
GND ( on the front panel) to an appropiate earth point.
8 . When the S M O O T H E R s w i t c h ( 3 7 ) is O N , the frequen-
c y response of the vertical axis amplifier for memoriz-
ed signals drops. T h e number of memorized w a v e f o r m
peaks on the screen is great or the rising speed of
w a v e f o r m is rapid, their amplitudes may become
smaller than those of memorized signals.
9 . T h e handle of the unit can be set to the desired angle
so that the unit is inclined for easy operation. T h e han-
dle turns in 1 5 degree steps.
Do not put any objects on the top of the unit or cover
the ventilation holes of the case, as it will increase the
temperature in the c a s e .
1 0 . Automatic s w e e p starts by changing vertical input
selector s w i t c h ( A C - G N D - D C ) into GND.
M A I N T E N A N C E A N D A D J U S T M E N T
M A I N T E N A N C E
Removal of case
1 . Lift the handle the upright position.
2 . Remove the four s c r e w s holding the case at the rear us-
ing a Philips type screwdriver.
3 . Push the rear panel and the unit c a n be removed from
the c a s e .
Caution
High voltage of up to 2 0 0 0 V is present at the C R T
socket, power supply circuit board and F O C U S control.
T o prevent electrical shock, be sure to turn off the
power w h e n removing the c a s e . Special care should be
used not to touch the high voltage circuits after the case
has been removed.
Voltage Conversion
(1) T h e unit is factory adjusted to operate on 2 4 0 V A C .
W h e n the unit is to be operated from 1 0 0 V , 1 2 0 V or
2 2 0 V , be sure to change the connection of the
voltage selector plug at the rear panel observing the ar-
row mark provided on the plug. For operation on 1 0 0
or 1 2 0 V , replace the fuse with one of 1.5 A rating.
For operation on 1 2 0 V , plug the voltage selector to
1 1 7 V position.
(2) Fuse is fitted in the fuse holder at the rear panel.
A D J U S T M E N T
Before making adjustments, the following points
must
be
observed:
1 . T h e adjustment items outlined below have been factory
aligned prior to shipment. If readjustments become
necessary, make certain that the power supply voltage
is properly calibrated (except for adjustment of probe).
2 .
Adjustments can be made by the semi-fixed resistors
and trimmers. Use a well insulated flat blade
screwdriver.
3 . High voltage (about 2 0 0 0 V ) is present on the P O W E R
S U P P L Y circuit. Be sure to turn off the power before
removing the circuit boards.
4 . T o insure optimum results, w a r m up the unit for more
than about 3 0 minutes before making adjustments.
DC BAL Adjustment
1 . D C B A L (1) adjustment
If the trace moves up or down at particular ranges w h e n
the vertical attenuator ( V O L T S / D I V ) is turned, perform
the following adjustment.
(1) S e t the D I S P L A Y M O D E to R E A L and the input
selector s w i t c h ( A C - G N D - D C ) ' t o G N D , then set the
trace in the center of the scale.
(2) T u r n the vertical attenuator V A R I A B L E fully
counterclockwise and adjust the S T E P B A L V R so
that the trace is stationary
at
all ranges w h e n the
V O L T S / D I V
is
turned.
2 0
