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OSCILLOSCOPE
OS-9020G
SERVICE MANUAL
@
LG Precision Co., Ltd.
Servicing Precautions
Please read all instructions in the service manual throughly
before servicing.
Disconnect power cord from power source before opening the
enclosure.
Instructions
1. To maintain the precision and reliability of the product use it
in the standard setting (temperature 10 o -35 o centigrade, humidity
45%-85%)
2. After turning on power, please allow a 15-minute pre-heating period
before use.
3. Triple-line power cord is to be used for the product. But when you
are using the doubleline cord, make sure to connect the earth terminal
of the product to the earth at the power source for safety.
4. For quality improvement the exterior design and specifications of the
product can be changed without prior notice.
Warranty
Warranty service covers a period of one year from the date of original
purchase.
In case of technical failure within a year, repair service will be
provided by our service center or sales outlet free of charge.
We charge for repairs after the one year warranty period expires.
When the failure is a result of user's neglect, natural disaster or
accident, we charge for repairs regardless of the warranty period.
Notice
This Serivce Manual describes the most typical product of this model.
If there are any specific differences between this Manual and the
servicing unit, please contact Goldstar Precision sales office in
your area.
LG Precision Co-, IdtcA
CONTENTS
G E N E R A L . . ............................................ 4
S P E C I F I C A T I O N S ................................ 5
A C C E S S O R I E S ...................................... a
P R E V E N T I V E M A I N T E N A N C E ................ 9
C I R C U I T D E S C R I P T I O N . . .................... 10
C A L I B R A T I O N . . .................................... 14
6-l. Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6-2. Test Equipment Required.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4
6-3. Preliminary Procedure.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6-4. Preliminary Control Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6-5. Initial Starting Procedure.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7, SEMICONDUCTOR LEAD
CONFIGURATIONS................................. 28
8* ELECTRICAL PARTS ARRANGEMENT
Q* ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . 32
10, B L O C K DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
11, W I R I N G DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
12, S C H E M A T I C DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . 53
13* MECHANICALPARTZ-LiST&EXPLODED
VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
14, E X T E R N A L V I E W S .............................. 74
3
l- GENERAL
This product of OS-9020G is as shown on Fig.1 and to generate triangular
wave, sine wave and rectangular wave which have the frequency range and DC
offset function from 0.1Hz to 1Hk as well as the waveform meter that has
frequency range from DC to 20Mk and is a multipurpose portable oscilloscope
mounted by a function producer that generates otherwise pills of total
level of the same frequency as above.
Fig. l. OS-9020G Oscilloscope
4
2, OS-Q020G S P E C I F I C A T I O N S
PARTS SPECIFICATIONS
+ CRT
Configration and @inch rectangular screen with internal graticule ; 8x10 Div
useful screen ( 1 div = 1 Cm ) , marking for measurement of rise time.
2mm subdivisions along the central axis.
2) Accelerating
potential approx. +1.9 KVDC (ref. cathode)
3) Phosphor P31 (standard)
4) Focussing possible
5) Trace rotation provided
6) Intensity control provided
* Vertical Deflection
1) Band-width (-3dB) DC to 20MHz normal (xl)
DC coupled DC to 7MHZ magnified (x5)
AC coupled 10Hz to 20MHz normal (xl)
10Hz to 7MHz magnified (x5)
2) Modes CHl,CH2,ADD,DUAL ( CHOP ; Time/div switch - 0.2s to 5mS.
ALT ; Time/div switch - 2mS to 0.2~s )
3) Deflection Factor SmV/div to 5V/div in 10 calibrated steps of a l-2-5 sequence
continuously variable between steps at least 1:2.5
(x5 MAG ; lmV/div to lV/div in 10 calibrated steps.)
4) Accuracy normal ; f3% , magnified ; f5%
5) Input impedance approx. lM-ohm in parallel with 25pF
6) Maximum input Direct ; 250V(DC+peak AC),
voltage with probe ; refer to probe specification
7) Input coupling DC - GND - AC
8) Rise time 17.5nS or less(50nS or less: at x5 MAG)
9) Clil out 20mV/div into 50 ohms ; DC to 10MHz ( -3dB )
10) Polarity invertior CH2 only
* Horizontal
Deflection
1) Display modes xl , xl0 ( X-Y
2) Time base A 0.2us - 0.2Wdiv in 19 calibrated steps, l-2-5 sequence.
uncalibrated continuous control between steps at least 1:2.5
3) Hold-off time variable with the holdoff control
5
PARTS SPECIFICATIONS
4) Sweep 10 times (maximum sweep rate ; 20nS/div)
magnification Note ; 50nS/div,20nS/div of TIME BASE are uncalibrated.
5) Accuracy f3%, f5% (0