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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 . . ............................................ S P E C I F I C A T I O N S ................................ A C C E S S O R I E S ...................................... P R E V E N T I V E C I R C U I T M A I N T E N A N C E ................ 4 5 a 9 10 14 14 1 14 15 15 4
D E S C R I P T I O N . . ....................
C A L I B R A T I O N . . .................................... 6-l. Calibration Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2. Test Equipment Required.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3. Preliminary Procedure.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4. Preliminary Control Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5. Initial Starting Procedure.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7, SEMICONDUCTOR LEAD CONFIGURATIONS................................. ELECTRICAL PARTS ARRANGEMENT
28
8*
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29 32 51 52 53
Q* 10, 11, 12, 13* 14,
ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . B L O C K W I R I N G DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . .
S C H E M A T I C
MECHANICALPARTZ-LiST&EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E X T E R N A L V I E W S ..............................
69 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, PARTS
+ CRT
OS-Q020G
S P E C I F I C A T I O N S
SPECIFICATIONS @inch rectangular screen with internal graticule ; 8x10 Div ( 1 div = 1 Cm ) , marking for measurement of rise time. 2mm subdivisions along the central axis. approx. +1.9 KVDC (ref. cathode) P31 (standard) possible provided provided DC to 20MHz normal (xl) DC to 7MHZ magnified (x5) 10Hz to 20MHz normal (xl) 10Hz to 7MHz magnified (x5) CHl,CH2,ADD,DUAL ( CHOP ; Time/div switch - 0.2s to 5mS. ALT ; Time/div switch - 2mS to 0.2~s ) 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.) normal ; f3% , magnified ; f5%
Configration and useful screen 2) Accelerating potential
3) Phosphor 4) Focussing 5) Trace rotation 6) Intensity control
* Vertical Deflection 1) Band-width (-3dB) DC coupled AC coupled 2) Modes 3) Deflection Factor
4) Accuracy 5) Input impedance 6) Maximum input voltage 7) Input coupling 8) Rise time 9) Clil out 10) Polarity invertior * Horizontal Deflection 1) Display modes 2) Time base A 3) Hold-off time
approx. lM-ohm in parallel with 25pF Direct ; 250V(DC+peak AC), with probe ; refer to probe specification DC - GND - AC 17.5nS or less(50nS or less: at x5 MAG) 20mV/div into 50 ohms ; DC to 10MHz ( -3dB ) CH2 only
xl , xl0 ( X-Y 0.2us - 0.2Wdiv in 19 calibrated steps, l-2-5 sequence. uncalibrated continuous control between steps at least 1:2.5 variable with the holdoff control
5
PARTS 4) Sweep
SPECIFICATIONS
magnification 5) Accuracy L Trigger System 1) Modes 2) Source 3) Coupling 4) Slope 5) Sensitivity and Frequency range AUTO,NORM
10 times (maximum sweep rate ; 20nS/div) Note ; 50nS/div,20nS/div of TIME BASE are uncalibrated. f3%, f5% (0°C to 50C),additional error for magnifier f2%
auto , norm , TV-V , TV-H CH1 , CH2 , LINE , EXT AC + or 20Hz - 2MHz INT EXT 0.5 div 0.2 vp-p 2MHz - 20MHz 1.5 div 0.8 VP-p
TV-VW-H 6) External trigger input impedance Max. input voltage * X-Y Operation 1) X-axis
at least 1 div or l.OVp-p approx. lM-ohm in parallel with 25pF 250V ( DC + AC peak )
(same as CH1 except for the following) Deflection factor ; same as that of CH1 ; f5% Accuracy Frequency response; DC to 500KHz ( -3dH ) same as CH2 3" or less ( at DC to 50KHz ) approx. 1KHz frequency , duty ratio : 50% 0.5V (*3%) square wave
2) Y-axis 3) X-Y phase deff. * Calibrator (px.obe adj) * Function Generator 1) Frequency Range 2) Output Waveform 3) Frequency stability 4) Frequency variable 5) Output impedance
0.1 Hz to 1 MHz ( 7 range ) sine , triangle , square f0.5% (1/10/100/1K/10K/100K range) (1M range) [ after 15 minutes late power on fl% 10 : 1 Min. 50a f10% ( TrL output ; FAN-OUT 20 ea ) 6
PARTS
SPECIFICATIONS
14Vp-p Min. (open circuit) - continuous variable DC OFFSET provided (open circuit ; f6V Min.) TTL LEVEL (square wave only) ; 3Vp-p Min. 2% Max. (10Hz - 100KHz) / lOHz(l00Hz range 0.1) less than l/33 50f3% Max. ( at 1KHz ; max. output level) 50a output ; 120nS Max. ( at max. output LEVEL into 50n) 'ITL output ; 25nS Max. voltage range fuse 2A250V 2A250V lA250V lA250V
6) Output Voltage
7) Sinewave distortio -n & jittering 8) Duty ratio 9) Square wave rise & fall time * Power Supply 1) Voltage range
100 ( 90 - 110V) / AC 120 (108 - 132V) / AC 220 (198 - 242V) / AC
230 (207 -
250V) / AC 50 / 60Hz approx. 45W
2) Frequency 3) Power consumption * Physical Characteristics 1) Weight 2) Dimension * Environmental Characteristics 1) Temperature range for rated operation 2) Max. ambient operating temp. 3) Max. storage temerature 4) Humidity range for rated operation 5) Max.ambient operating humidity 320 mm (WI x
7.4Kg 140 mm (H) x 430 mm (L)
+10"Cto
+35"C (+50"Fto
+95"F
1
0' C to +40 O C ( +32"F to +104' F ) -20" C to +70 o C ( -4" F to +158 a F > 45% to 85% RH 35% to 85% RH
7
3*
ACCESSORIES
(1) Cable (BNC to CLIP) (2) Probe (Option)
-__-_________-_--v---W-----------------------
1 2 1 1 1
-___--__---_--_------~~~~~--~~--~~----~--~~--~--~-_----
(3) Fuse ( 2A for 100V or 120V set or 1A for 220V and 230Vset ) (4) Power supply code (5) Operation manual
-------________--------~~~-~--~--__-_---------~~ -_--_----_-__-_-___--~-~------~~~~~-~-~~~~~ ------
8
4,
P R E V E N T I V E M A I N T E N A N C E
Preventive maintenance, when performed on a regular basis, can prevent instrument breakdown and may improve the reliability of the oscilloscope. The severity of environment to which this instrument is subjected will determine the frequency of maintenance. A convenient time to perform preventive maintenance is preceding recalibration of the instrument.
Disassembly Remove the top cover and the bottom cover of the instrument. Most of the internal parts of the instrument are now accessible, if access to the front of the circuit board are necessary, remove the knobs from the external control shafts on the board.
Cleaning The instrument should be cleaned as often as operating conditions require. Accumulation of dirt in the instrument can cause component breakdown. The covers provide protection against dust in the interior of the instrument. Loose dust accumulated on these covers can be removed with a soft cloth or small brush. Dirt that remains can be removed with a soft cloth dampened in a mild detergent and water solution. abrasive cleaners should not be used. Cleaning the interior should only be occasionally necessary. The best way to clean the interior is to blow off the dust with a dry, lowvelocity stream of air. A soft-bristle brush or a cottontipped applicator is useful for cleaning in narrow spaces or for cleaning more delicate components.
Visual Inspection The instrument should be inspected occasionally for such defects as bracken connections, improperly seated transistors, damaged circuit boards, and heat-damaged parts. the corrective procedure for most visible defects is apparent ; however, particular care must be taken if heat-damaged components are found. Overheating usually indicates other trouble in the instrument ; therefore, correcting the cause of the overheating is important to prevent recurrance of the damage.
5.
C I R C U I T D E S C R I P T I O N
The block diagram ( page 51 1 shows the overall relationship between all of the circuits. Complete schematics of each circuit are also given in section schmatics diagrams ( page 52 to 68 1. Refer to these diagrams throughout the following circuit description for electrical values and relationship.
1 ATTENUATOR j Signals applied to the input connector can be either AC coupled or DC coupled, or they can be disconnected to the internal circuit when S201 ( S301 1 is GND position. Attenuation is determined by the setting of the VOLT / DIV switch. The attenuator that is controlled by the VOLT / DIV switch has +1/2, +l, s10, 3100 circuit. s2, -5, -10 circuits are in RA201 ( RA301 > and +10, -100 circuits are between S202 ( S302 1 and S203 ( S303 1.
CH1 (CH21 INPUT AMPLIFIER Signal from the input attenuator is connected to source follower QZ01 ( Q301 1. When excessively high-amplitude signals are applied to the source follower, the signals will be Q202 ( Q302 ) and the gate-source junction of Q201 ( Q301 1. When S202D ( S302D > is open ( PULLX5MAG 1, the signal that is feed back to OP AMP through R23Q ( R328 ) amplfies the output signal of Q204 ( Q304 > by 5 times. And the signal of Q206 ( Q306 ) base is converted from a single-ended signal to a paraphrase signal by differential amplifier.
CH1 (CH2 1
PRFJWP&TRIGGERPICKOFF
Vertical preamp circuits provide control of vertical position. They also contain a stage to provide a sample of the input signal to the trigger preamp circuit for internal triggering from the CH1 or CH2 signal only. And the trigger preamp of CH1 provides the CH1 input signal to the horizontal amplifier in the X-Y position of the TIME / DIV switch. The trigger preamp circuit amplifies the internal trigger signal to the level necessary to drive the trigger generator circuit.
10
VERTICAL CONTROL The vetical switching circuit determines the input signal or combination of input signals to be connected to the vertical main amp. Input signal combinations that can be displayed are selected by D FLIP-FLOP that is controlled by the vertical mode switches and the X-Y position of the TIME / DIV switch. In the DUAL modes, both channels are alternately displayed on a shared time basis.
VERTICAL MAIN AMPLIFIER The vertical main amplifier circuit provides the final amplification for the vertical deflection signal before it is applied to the vertical deflection plates of the CRT.
TRIGGER GENERATOR The Trigger Generator circuit produces trigger pulses to start the sweep generator circuit. The Trigger Generator circuit consists of the trigger source, trigger mode switch, TV synchronization circuit, trigger amplifier, U603 and etc. The Trigger Source Switch selects one signal of the signals from the vertical trigger preamps, power line source applied to this instrument, external trigger input BNC connector connected to front panel. The Trigger Generator Circuit has the circuit to control the trigger level and slope. The signal type is AC. The Trigger mode Switch determines the operating mode for the trigger generator circuit. In the NORM mode, the sweep signal is generated only the trigger signal is generated, Operation in the AUTO, TV-V mode is the same operation as NORM mode, except that a free running trace is displayed when a trigger pulse is not present or the amplitude of the trigger signal is not adequate. The Base Signal of Q605 which enters through three switches, Q601, Q602 and etc., is amplified by Q604, Q605. Tht> amplified signal, the collector signal of Q604, enters the NO.2 pin of U603, outputs in NO.8 pin of U603. The NO.8 pin signal of U603 is called trigger signal or trigger pulse.
11
Sweep generator circuit consists of sweep gate circuit and miller integrator. The sweep gate is on, a very little negative going signal is generated in the gate of Q612, input Miller Integrator, by R-C network. The signal in the gate of Q612 is amplified by Miller Integrator, the amplified signal appears in the Emitter of (9614, is called sweep signal and enters the Base of Q627 through R732. This sweep signal is generated on commend ( trigger pulse ) from the trigger generator circuit. The sweep gate circuit produces an unblanking gate to unblank the CRT during sweep time.
1 HORIZONTAL OUTPUT AMPLIFIER 1 The Horizontal Output Amplifier provides the final signal amplification to drive the CRT horizontal deflection plates. The Horizontal Output Amplifier consists of six cascade stage amplifiers. The first stage horizontal main amplifier has a low input impedance and requires very little voltage change at the input to produce the desired output change. The output signal from complementary amplifier Q638, Q639 drives the right horizontal defbctim plate. The output signal from complementary amplifier Q636, Q637 drives the left horizontal deflection plate. The Horizontal Output Amplifier has the horizontal magnification and the horizontal position functions. In all position of the TIME / DIV select switch except X-Y the input signal .of the horizontal output amplifier is the sawtooth signal from the sweep generator. In the X-Y position of the TIME / DIV select switch the input signal of the Horizontal Output Amplfier is the signal from the channel 1 preamp circuit of the vertical deflection system.
12
The low voltage Power Supply Circuit provides five regulated sources ( -12 Volts, +5 Volts, -I- 12 Volts, +55 Volts, +140 Volts ) and two unregulated source ( 195 Volts, +28Volts ) used to operate the vertical deflection system, horizontal deflection system and CRT driving circuit. 1 CRT CIRCUIT 1 The CRT Circuit provides the voltage levels and control circuits to operate CRT. The circuitry consists of the z-axis amplifier, high voltage oscillator, high voltage regulator, high voltage rectifier and the CRT controls. The Probe adj. circuit produces a square wave output signal with accurate amplitude and frequency. This output signal available as a square wave Voltage at the 0.5Vp-p ( 1KHz ) connector. FUNCTION GENERATOR CIRCUIT The basic waveform generated in the function generator circuit is the triangle wave. This is accomplished by charging and then discharging a capacitor by equal magnitude currents. A dual comparator and flip flop (U4, SN75107A) determine whether the capacitor (C16, C17, C18, C20, C21, C27) is being charged or discharged. when the voltage on the capacitor reaches the positive limit, the charging current is switched off and the capacitor discharges until the lower limit is reched at which time the charging current is then reapplied. the output of the dual comparator is a square wave. To produce a sine wave, the triangle wave is shaped by a special amplifier. (Q8, Q9, Q10, Ql3) Range switching is accomplished by changing the magnitude of the current sources Wl, U2, Ql, Q3, Q6) and the timing capacitor. Dial frequency tuning (VR8) is done by charging the magnitude of the current sources. A frequency change of over a 10:1 is possible with the frequency Dial.
13
6e
C A L I B R A T I O N
Goldstar Precision provides complete instrument repair and calibration at our oversea's office and authorized dealer. Contact your local Goldstar Precision office or representative. 6-1. Calibration interval To maintain instrument accuracy, perform the calibration of the OS-9020G Units at least every 1000 hours of operations or every six month if used frequently. 6-2. Test equipment required The following test equipment ( Table 6-l > and accessories, or equivalent, are required for the complete calibration of the OS-9020G Units. The given specifications for the test equipment are the minimum necessary for accurate calibration. Therefore, the specifications of any test equipment used must meet or exceed the list specifications. All the test equipment is assumed to be correctly calibrated and operating within the listed specification. Operating instructions for the test equipment are not given in this procedure. Refer to the instruction manual for the test equipment if more information is needed. 6-3. Preliminary procedure This instrument should be calibrated at an ambient temperature of +20'tc: ( f 5°C 1 for best overall accuracy. 1. Connect the instrument to AC line voltage, 50/60Hz line source. 2. Set the instrument controls as given in the Preliminary Control Setting. Allow at least fifteen minutes of warmup before proceeding. 3. See the Adjustment Locations in the pullout pages.
14
6-4. Preliminary control settings Preset the instrument controls to the settings given below, when starting the calibration procedures. Controls a FOCUS Settings Midrange
,,,
18 TRACE ROTATION1 As desired a SCALE ILLUM Fully counterclockwise 0 LEVEL @ SLOPE @ MODE 6 0 HOLDOFF @ TRIG SOURCE 5 q V/DIV CH1 Normal (Pushed In)
-
TRIG Midrange, normal + Normal Auto Fully counterclockwise CH1
I
- VERTICAL @ V-POSITION Q V-VARIABLE Q INPUT COUPLING 0 VOLTS/DIV Midrange CAL(fully clockwise pushed in) GND (AC-GND-DC)
- FUNCTION GENERATOR @ AMPLITUDE @ RANGE SW. @ FREQ. 8) OFFSET DIAL full counterclockwise 1 0.1 PUSH
I@ V-MODE Q CH2 INVERT
- HORIZONTAL @ H-POSITION Midrange
6-5. Initial starting procedure 1. Push the POWER switch. 2. Wait a few seconds for the cathode ray tube ( CRT ) to warm up. A trace should appear on the display of the CRT. 3. If the trace disappears, increase ( clockwise ) the INTENSITY control setting until the trace is easily observed. 4. Adjust FOCUS control for the best focused display. 5. Readjust POSITION controls if necessary, to center the trace.
15
POWERSUPPLYSYSTEM
NOTE : Before you begin,
see ADJUSTMENT LOCATIONS in the pullout pages.
Control settings Preset the controls as given in the Preliminary Control Settings. Cl1 Check Low-voltage Supply, if necessary. a. Connect the digital voltmeter ( DVM > from the +12 volt line. : +11.75V to +12.25V (+12V point of horizontal board) b. Connect the DVM from the -12 volt line. .. -11.75v to -12.25V (-12V point of horizontal board) c. Connect the DVM from the +5 volt line. : + 4.75V to + 5.25V (+ 5V point of horizontal board) d. Connect the DVM from the +55 volt line. : +54 V to +58 V (+55V point of horizontal board) e. Connect the DVM from the +140 volt line. (+140V point of horizontal board) : +135 v to +143 v f. Connect the DVM from the +195 volt line. (+195V point of horizontal board) : +190 v to +210 v [23 Adjust Low-voltage Supply. Adjust the VR901 for DVM reading of -12V ( f 0.lV >. C31 Check High-voltage Supply. a. Connnect the DVM to the H.V test point ( CRT SOCKET B/D -K(20M) ) by High-voltage Probe. b. Check for DVM reading as -1805V - -1995V C. Adjust the VR618 for DVM reading of -1900V ( f 20V ). (Horizontal B/D p/n ; 513-547 used only) D I S P L A Y Control Setting Preset the controls as given in the Preliminary Control Setting.
141 Check/Ad just CRT Bias.
Set the TIMWDIV switch to the 1mS a. Rotate the INTHNSITY to the direction of 10 o'clock as shown. INTEN
16
b. Observe the trace of CRT. c. Adjust the CRT Bias Adjustment VR617 so that the trace makes an appear.
151 Check/Adjust Trace Rotation.
a. Check that the trace is parallel to the horizontal center line. b. Adjust the TRACE ROTATION for a trace that is parallel with the horizontal graticule lines.
[61 Check/Adjust ASTIGmatism and FOCUS a. Vertical Mode switch to the CH2 [X-Y1 position, and Display switch to the [X-Y1 position, and AC-GND-DC to GND. b. Set the INTENSITY control for a small spot, as the following figure, using position controls.
The SDot
of
screen
c. Check that the spot is round. d. Adjust the FOCUS adjustment and ASTIG adjustment VR616 for a round spot.
17
H O R I Z O N T A L S Y S T E M Control settings Preset the controls as given in the Preliminary Control Settings. [71 Check/Adjust Horizontal Gain. a. Set the input AC-GND-DC to DC. b. Set the TIME/DIV switch to the lms. c. Check that the time marks align with the graticule line over the center eight DIVisions, within 3%. d. Adjust the H GAIN adjustment VB611 so that the time marks align with the center eight graticule lines. C83 Check/Adjust Horizontal X 10 MAG Gain. a. Set the TIME/DIV switch to the 1mS. b. Set X 10 MAG ( Pull out the VARIABLE control 1. c. Check that the one-cycle time marks align with the ten division graticule lines, within 5%. d. Adjust the MAG GAIN adjustment VR612 so that the one-cycle time marks align with the ten division graticule lines. e. Push in the VARIABLE control after check and adjustment. [91 Check/Adjust MAG CENT. a. Set the TIME/DIV switch to the 1 mS. b. Being the VARIABLE control is in pulled out state ( Xl0 MAG >, the left end of the trace is brought to the center point and then the VARIABLE is depressed. c. Observe the movement of the left end of the trace. d. Adjust the MAG CENT adjustment VR614 for the movement of the end of the trace within f 0.2DIV. Cl01 Check/Adjust low spaced sweep accuracy. a. Set the time mark generator for 5mS time marks. b. Set the TIME/DIV switch to 5mS. c. Check that the time marks align with the graticule line over the middle eigth divisions, whth 3%. d. Adjust the 5mWDIV adjustment VR606 so that the time marks coincide with the middle eight graticule lines. Cl11 Check/Adjust High speed sweep accuracy. a. b. c. d. Set the input coupling switch to DC. Set the time mark generator for 10~s time marks. Set the TIME/DIV switch to the 10~s. Check that the time marks align with the graticule lines over the middle eigh divisions. e. Adjust VC601 that the time marks coincide with middle eight graticule lines.
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VERTIACALSYSTEM Control settings Preset the controls as given in the Preliminary Control Settings. Cl41 Check/Adjust DC Balance ( Step attenuator balance 1. a. b. c. d. Set the VOLTWDIV switch to the 5mV position. Position the trace to the horizontal center line. Change the PULL x5MAG switch to the 1mV position. Check that the trace is within 0.1 division of the horizontal center line. e. Adjust the CH1 ( CH2 > DC BAL adjustment,VRZBl ( CH1 > or VR301 ( CH2 1, for a trace at the horizontal center line. f. Repeat part (a> through (e) until less than 0.05 division shift is noted when changing the VOLTWDIV setting.
Cl51 Check/Adjust ADD BALANCE. Set the TIME/DIV switch to the 1mS position. Set the CH1 and CH2 AC-GND-DC switches to GND. Set the V-MODE switch to [CHlI. Next, Adjust the vertical Position control that the trace is identical with the horizontal center graticule line. e. Set the V-MODE switch to CCH21. f. Next, Adjust the vertical Position control that the trace is identical with the horizontal center graticule line. Set the V-MODE switch to [ADD]. Check that the trace is identical with the horizontal center graticule line within f 0.5 division. i. Adjust the ADD BALANCE adjustment VR501 for two times of the difference with the horizontal center graticule line. [161 Check/Adjust Vertical Position Center. a. Confirm the vertical POSITION control at the midrange. b. Check that the trace is within 1 division. c. Adjust the Position Center adjustment VR203 ( CH1 >, VR303 ( CH2 > for a trace at the horizontal center line.
19
Cl71 Check/Adjust Xl AC GAIN.
::
Set the TIME/DIV switch to the 1mS position. Set the VOLTWDIV switch to the 10mV position. Set the AC-GND-DC switch to DC. :: Connect the square-wave generator( using 1KHz output range ). e. Adjust the output amplitude of that generator for 5 division deflection of screen. f. Check that the high-voltage level of pulse is flat.
g. Adjust the X 1 AC GAIN adjustment VR202( CH1 ),VR302( CH2 ) for a flat level. Cl81 Check/Adjust Vertical Gain. a. Set the VOLTWDIV switch to the 10mV position and AC-GND-DC switch to DC. b. Connect the standard amplitude calibrator to the input Connector. c. Set the standard amplitude calibrator for a 50mVp-p signal. d. Check for a display of five divisions. e. Adjust the GAIN adjustment VR204 ( CH1 ), VR304 ( CH2 ) for a display of 5 divisions within 3%. f. Check all the VOLTWDIV switch settings. Cl91 Check/Adjust Input Capacity ( ATT : +l ). a. b. c. d. Set the VOLTWDIV switch Set the AC-GND-DC switch Connect the L-C meter to Check the input capacity to the 10mV position. to DC. the input terminals. for approximately 25pF.
C203 Check/Adjust Vertical Step Response.
E:
Set the VOLTWDIV switch to the 10mV position. Set the TIME/DIV switch to the 0.2~s position. C. Connect the fast-rise, positive output ( 50mV, 1MHz ) of the square-wave generator to the input. Use a 500 termination and cable. d. Set the square-wave generator to 1MHz. Adjust the square-wave generator output for a 5 divisions display. e. CH1 : Adjust the VC503 for a square-wave that is flat. Then, adjust VC501 for over-shoot that is +0.15DIV. CH2 : Adjust the VC306 for over-shoot that is +0.15DIV.
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[Zl] Check/Adjust Attenuation Compensation ( ATI' G-0, Sl00 1. a. Set the AC-GND-DC switch to DC. b. Connect the square-wave generator to the CH1 ( CH2 ) input terminals, check for a square-wave that is flat ( flat top ) under the following settings. ATT + 10 t100 VOLTWDIV 0.1 v 1v The square-wave generator output 0.5 V 5 v
c. Adjust the trimmer condenser for a square-wave ( flat top 1 under the following settings.
I
ATT
+
I
VOLTWDIV 0.1 v 1 v
The square-wave generator output
I 1
Adjust CH1 (CH21 VC204 ( VC304 1 VC203 ( VC303 >
10 1
0.5 V 5 v
Sl00 1
II221 Check/Adjust Input Capacity.
a. Connect the L-C meter to the input connector. b. Check the input capacity for a approximately 25pF. c. Adjust the trimmer condensers for a 25 pF input capacity under the following settings.
I
ATT Sl +10
1 I
VOLTWDIV 5 mV 0. 1 v 1 v
1 I I ]
Adjust CH1 ( CH2 >
( VC305 >
I
I
I
VC201 ( VC301 ) VC202 ( VC302 )
t100 )
21
TRIGGERINGSYSTEM C231 Check/Adjust TRIG CENT. a. Set the TRIG SOURCE switch to the CHl, the TRIG SLOPE knob pushed in, the VOLTWDIV switch to 10mV and the TIME/DIV switch to the 20~s. b. Connect the sine-wave generator to the input connector for a 0.3DIV ( 50KHz ). c. Set the TRIG LEVEL knob to the midposition. d. Adjust the VR605 so that synchronization is effected on the waveform, 0.3DIV on the screen. e. Next, set the TRIG SLOPE to -(pulled out state) and insure that synchronization is effected. After confirmation, leave the TRIG-SLOPE in the depressed state. Readjust when stepped out.
C241 X-Y Operation
[24-l] Check/Adjust X Gain. a. Set the V-MODE switch to CH& the TIME/DIV switch to the [X-Y], the AC-GND-DC switch of CH1 to DC, the AC-GND-DC switch of CH2 to GND. b. Set the VOLTWDIV switch to the 10mV, with Xl GAIN. c. Connect the standard amplitude calibrator to the CH1 input connector. d. Set the standard amplitude calibrator for a 50mV. e. Check for a display of 5 divisions. f. Adjust the X GAIN adjustment VR610 for a display of 5 divisions within 5%. C24-21 Check/Adjust X Position Center. a. Set the TIME/DIV switch to the [X-Y], the V-MODE switch to CH2 the horizontal POSITION control to the midposition and the AC-GND-DC switch to GND. b. Check to see that round spot is near the center graticule and is within 0.2 division against the horizontal line. c. Adjust the X CENT adjustment VR609 to position spot at the graticule center. PROBE ADJUST
[251 Check/Adjust Probe Adjust terminal ( O.SVp-p, 1KHz ). a. b. c. d. e. Connect the Probe Adjust terminal to the Digital Frequency Counter. Check for the Probe Adjust frequency of lKHz, within 20%. Next, connect the Probe Adjust terminal to the oscilloscope. Check for the Probe Adjust output of 0.5V, within 3%. Adjust the 0.5V adjustment VRll01 for the Probe Adjust output of 0.495 to 0.505V.
22
F U N C T I O N C261 CHECK/ADJUST SYMMETRY
G E N E R A T O R
S Y S T E M
a. Setting of equipment for adjustment * FUNCTION GENERATOR FUNCTION RANGE 1 SINE ( ) ( 1
0.1
SQUARE (
>
(1 ( >
TRIANGLE(* > 1K (*> l0K ( 1 lQQK ( > 1M ( > 1.0
10
(
1
100
1
FREQ. DIAL 1
(* 1
1 AMPLITUDE 1 OFFSET
FULLY CCW (MINI ( ) PUSH
(*)
FULLYCW (MAX)
PULL ( >
OUTPUT
FULLY ccw ( 1 >
FULLYCW ( 1 500 (*>
TTL(
* OSCILLOSCOPE 1 VOLTS/DIV 1 TIME/DIV 50 mV/DIV ( 1
2 V/DIV (* 1
50 uS/DIV ( * >
I DC (*1
0.2 mS/DIV ( >
GND( >
1
mS/DIV ( 1
AC( 1
I
COUPLING
b. Connect output terminal of F/G (50Qcz) and input terminal of oscilloscope with BNC to BNC cable. c. To adjust VR2 (symmetry) of F/G so that may show as the following figure on the oscilloscope screen as adjusting as to be full of the oscilloscope screen by a cycle of triangular wave as turning knob of SWP var of the oscilloscope
100... I
._..
,.._
____
.___--._..
.
.
.
.
.
.
.
.
.
.
.
.
--4-++4--
-____
10 --++++-
---++++
b ------A K------a a Adjust the length of a 81 b may be equal (in the time axis).
23
C273 CHECK/ADJUST SINE WAVE DISTORTION
a.
Setting of equipment for adjustment
l
FUNCTION GENERATOR FUNCTION RANGE FREQ. DIAL AMPLITUDE OFFSET PULL ( ) OUTPUT 'ITL( ) FULLY ccw ( ) FULLYCW ( ) 500 (*) SINE (
l
)
SQUARE ( )
TRIANGLE(
)
1 ( ) 10 ( > 100 ( ) 1K (*) 10K ( ) 100K ( ) 1M ( )
0.1 ( 1
1.0 (
l
)
FULLY CCW (MN) ( ) PUSH ( * )
FULLYCW (MAX) (I)
* OSCILLOSCOPE VOLTWDIV TIME/DIV COUPLING 50 mV/DIV ( ) O.lmS/DIV ( * )
DC (*1
5V/DIV (8) 0.2 mS/DIV ( )
GND( 1
1 mS/DIV ( )
AC( 1
b. Connect by BNC to clip cable the optput terminal of F/G and AF input terminal of distortion factor meter(DFM).
C.
To adjust so that the hairline of meter may indicate 100% by adjusting set ref level Knob of the DFM.
d. To adjust 'Reject fundamental' Knobs (3 each) of DFM so that the hairline of meter be the minimum as gradually lowering the switch (Sl) to 100%, 30%, 10% and 5% located under METER upon aligning the function switch of DFM to 'distortion + noise' (to 100klk) e. To switch to 1% position for Sl of DFM and adjust VR4 (Sin) and VR5 (Sin-Bal) of F/G so that hairline of the meter may be the minimum. If the adjustment to 1% or less cannot be made in this instance to exactly adjust again the No.1 item as the fundamental symmetry 1 was wrong
24
C281 CHECK/ADJUST SINE WAVE OR SQUARE WAVE AMPLITUDE a. Equipment setting for adjustment * FUNCTION GENERATOR FUNCTION RANGE FREQ. DIAL ) AMPLITUDE 1 OFFSET PULL ( )
OUTPUT
I SINE ( > SQUARE ( 1
TRIANGLE (*) ( )
100K ( > 1M ( )
I
1
(
) 10 ( > 100 (
0.1 ( 1
)
1K (*) 10K
1.0 (*) ( ) FULLY cw (MAX) ( * ) I
FULLY CCW (MIN)
PUSH ( * ) FULLY ccw ( ) ) FULLYCW ( ) 50Q (*)
I
I
TrL(
* OSCILLOSCOPE / VOLTS/DIV TIME/DIV COUPLING
I I ( 50 mV/DIV
( )
0.5 V/DIV ( * ) 0.2 mS/DIV ( )
GNU 1
5V/DIV
(
)
I
50 uS/DIV ( ) DC (*)
lmS/DIV (*)
AC( 1
b. Connect output terminal of F/G and input terminal of oscilloscope with BNC to BNC cable. c. Adjust amplitude by 2 Vp-p so that the oscilloscope screen may be equal to the figure as shown.
2vP-P
1
25
d. To switch range of F/G by sine. e. Adjust VR3 (S-gain) so that the maximum value of sine position at ZVp-p on the oscilloscope screen. f. Adjust VR6 (S-level) sothatsine level may be positioned by 2 intervals up &.down on the GND as center on the oscilloscope screen.
g. Switch the function of F/G to square. h. Adjust VR7 (square level) so that the oscilloscope screen may be 2Vp-p as the following figure shown.
I 1 1
y)... . . . . . . . . . . . .
t
$ I
T . . .-.. . . . . . _' ._`.
1 1
. . .
90----
4-6-u--
l
26
Table 6-l. TEST EQUIPMENT REQUIRED
Description
Minimum Specification
Example of Usage Check horizontal, vertical and trigger bandwidth. Check horizontal and Vertical gain.
1. Constant Amplitude 50KHz reference frequency ; Signal Generator maximum frequency 70MHz ; Variable amplitude 2. Standard Amplitude Amplitude accuracy : 0.25% , Variable amplitude ; 5mV to Calibrator 40V ; frequency : 1KHz square wave 3. Square - wave Generator Variable frequency : 10Hz to 1MHz ; output amplitude : 10mV to 100V
Check probe and vertical compensation.
4. Digital Multimeter 0.1% accuracy
Check power supply.
5. Digital Frequency Counter
0.1% accuracy
Check CAL frequency. and function Generator frequency. Check horizontal timing. External trigger operation check. Horizontal gain check and adjustment. Vertical Amplifier compensati -on checks and adjustment. Vertical Amplifier bandwidth check. External trigger operation checks. Function Generator sin wave check.
6. TimeMark Generator 0.1% accuracy 7. Cable Impedance : 50s1 ; type : RG-58/U ; length : 42 inches ; connectors : BNC. Impedance : 50ti ; Connectors : BNC. Ratio : 10X ; connectors : BNC ; impedance : 50S1 Connectors : BNC.
8. Termination 9. Attenutor
10. T - Connector
11. DISTORTION FACTOR METER
27
7. SEMICONDUCTOR LEAD CONFIGURATION
Table Marking for transistor electrode (bottom view) Electrode marking l.Emitter 2.E3ase I 1 2 3 3.Collector
Table
Marking
for
diode
electrode
Type of transistor 2N3904 2SA1206 2N3906 KSC 1674Y 2sc290 1
I
Type
of
diode
I Electrode marking I Polarity
1 2 3
1. Source
2.Gate
2SK304E
B
MA185 IN4003 lN4148 is953 ISS88 lSS133 ESJA52-12
3.Drain
2sc1907 2SC3468E KTAlOlSY KTC1615Y KTA1266Y KTC3196Y 2SA10290 2SA1371E
DZ-5.16
02-5.66 DZ-6.88 DZ-7.58 DZ-8.20 DZ-- 126 DZ--228
/G-q
123
1 .Emitter 2.Collector 3.Base
--@--
I
2SC2026 2sc3779
1 2 3
1 .Base 2.Emitter 3.Collector
Table
M a r k i n g f o r ICs Package outline
Type of IC Table Marking for transistor electrode (front view) marking CD45036CP
Type of transistor
Electrode
2SB546Y 2Sl3661C 2SD362R 2SD613D KSD286-Y
3 2 1
l.Base
2.Collector 3.Emitter
SN75107A/B GL324
_-_._-_
2SC3503E
5
2SA1381E
' 1
1 .Emitter
2.Collector 3.6ase
Others
1
1
28