Maintenance And Adjustment - Kenwood CO-1506 Instruction Manual

CAUTIONS ON HANDLING T H E SET
1. Select a place not exposed to direct sunbeam for
installation of this oscilloscope. Internal temperature
rise caused by the sunbeam makes the oscilloscope
unstable or damages the transistors.
2. Do not operate the oscillociope in a room where high
temperature and humidity prevail.
, 3 . Do not operate this oscilloscope in a place where
mechanical vibrations prevail or a place near an equip-
ment which generates strong flux of magnetic force or
impulse voltages.
4. With 2 3 0 V power supply, use 0.3 A fuse; with 117 V
power supply, use 0.5 A fuse. Be sure to use the fuse of
correct ampere fuse. Also, the voltage selector terminals
are located on the printed circuit board of bottom side.
C A U T I O N :
The voltage setting should be performed only after
turning the power off since the selector terminals are
near the dangerous —1600 V high voltage circuits.
5. Do not apply input voltage to V . I N P U T (7) and (8) in
excess of 6 0 0 Vpp, and to H. I N P U T (6) and (7) in
excess of 100 Vpp.
6. T h e alignment of the bright line will be affected by the
terrestrial magnetism depending on the position in which
the oscilloscope is placed with respect to the poles of the
earth. Consequent correction is required in the parti-
cular position of the oscilloscope.
Line voltage
Common terminal
( V )
number
100
13
117 13
230
13
MAINTENANCE
1. Removing the case and bottom plate:
Remove the six screws from the sides, and the two
screws from the top plate of the cabinet, using a Phillips
head screw-driver. T o remove the bottom plate, unscrew
the four screws with a Phillips head screwdriver.
2. Replacing the fuse:
(a) Remove the bottom plate.
(b) Remove the fuse located on the printed circuit board
and replace (see Fig. 13). -
(c) If the fuse is blown, be sure to check for the cause
and correct. T u r n the power on after replacement.
(d) With 230 V power supply, use 0.3 A fuse.
C A U T I O N :
Before fuse replacement, turn
discharge all capacitors near the fuse holder.

MAINTENANCE AND ADJUSTMENT

3. Aligning the C R T bright line:
Selector terminals
15
16
17
the power off and
(a) Loosen the three screws (16) clamping the C R T . T h e
C R T band clamping screws (17) should not be
loosened since they hold the C R T in place (see
Instructions for rear panel on page 5 ) .
Lift up
Removing the case from the cabinet
16. Ciamping screw for the C R T
17. Clamping screw for the C R T band
Fig. 14
Screws of cabinet
11