GoldStar OS-9020P 电路图.pdf

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1、GoldSttr ASK Bl Q-563-57 1 I LGILA RadioFans.CN 收音机爱 好者资料库 Servicing Precautions Please read alI instructions in the service rnanual throughly before servicing. Disconnect power cord fron power source before opening the enclosure. Instructions 1. To naintain the precjsion and reliabili.ty of the pro

2、duct use it. 2. After turning on power, please allow a 1S-ninute per-heating period before use. 3. Triple-Iine power cord is to be used for the product. But when you are using the doubleline cord, make sure to connect the earth terninal of the product to the earth at the power source for safety. 4.

3、For quality inprovenent the exterior design and specifications of the product can be changed without prior notice. Warranty Warranty service covers a period of one year fron the date of original purchase. In case of technical failure within one year, repair service wiII be provided by our service ce

4、nter. We charge for repairs after the one year warranty period expires. when the failure is a result of users 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

5、specific differences between this Manua and the servi.cing unit, please contact GoIdStar Precisj.on Co. Ltd. (iol-dStar Preci-siorr Co-, I-td. -2- RadioFans.CN 收音机爱 好者资料库 CONTENTS -. SPECIFI CATI ON 2. ACCESSORIES 3. PREVENTI/EMAINTENAICE 4. CIRCIJIT DESCRIPTION. 7A 5. CAI-IBRATI ONI . 13 5-1. Calib

6、ration Interval . 13 5-2, Test Equipment Required 13 5-3. Prelininary Procedure . 13 5-4. Prelininary Control Settings . . 14 5-5. Initial Starting Procedure 14 6. SEMI COIIDtTCTOR CONFI GTIRATI ()1I I-EAD 7-EI-ECTRI CAI- PARTS ARRAAIGEMEIVT (WITFI ADJTISTMENT I-OCATIONS) A- EI-ECTRI CAI- PARTS I-I

7、ST 27 9. BI-OCI DIAGRAM. 43 Lg. SCIEMATIC DIAGI?AMS . 44 1- 1-. WIRTNG DIAGRAM . 58 L2. MECFIANI CAI- PARTS I-I ST 8x10 Div ( 1 div = 1 Cn ) , marking for neasurenent of rise tine. Znm subdivisions along the centraL axis. +1.9KV approx. (ref. cathode) P43 possible provided provided r Z-Axis input (I

8、ntensi ty Modulation) 1) Input signal 2) Band-width 3) Coupling 4) Input inpedance 5) Maxinun input voltage Posi.tive going signal decreases intensity +svp-p or nore signal cases noticeable nodulation at nornal intensity setti.ngs. DC - ZMHz (-3dB) DC ZAK - 30Kohns 30V ( pQ+pgak AC ) r Vertical Defl

9、ection 1) Band-width (-3dB) DC coupled coupled Modes Deflection Factor 4) Accuracy 5) Input inpedance 6) Maxinun input voltage 7) Input coupling DC to DC to ZAMHz nornal IAMHZ magnified (CH1 only) LbHz lAHz to to ZLllHz nornal MlllHZ nagnifj.ed (CH1 only) CHl, CHZ, ADD. DUAL ( CH0P ; Tine,/div switc

10、h - A.Zs to 5nS , ALT ; Tine,/div switch ZnS to 0.ZuS ) SnV./div to SV,/div in 10 calibrated steps of a l-2-5 sequence. Continuously variable between steps at least I:2.5 x5 MAG ; lnV,/div to 1V,/div in 10 calibrated steps. (CHl only) nornalx3%magnifiedt 5% (CH1 only) approx. lM-ohn in paralIeI with

11、 30pF DirectiZSAV (Dc+peak AC), with probe;refer to probe specification DC-GND-AC -5- PARTSPECIFICATIONS 8) Rise tine 9) CHl out 10) Polarity invertion 17.5nS or less(35nS or less; xb MAG) Z5nV/divXZA% into 50 ohnsZAHz to t0llHz( -3dB ) CH2 only r Horizontal Deflection 1) Display nodes 2) Tine base

12、3)Sweep nagnification 4) Accuracy AX-Y , xlt VARIABLE b.2us/div b A.ZS/div in 19 calibrated steps, uncalibrated continuous control between steps L-2-5 sequence. at least 1:2.5 10 tines (naxinun sweep rate ; ZLnS/div) Note ; 50nS,/div.ZLnS/div of TIME BASE are uncalibrated. t3%, f.5% QC to 40C), addi

13、tional error for nagni.fier t2% r Trigger Systen 1) Modes 2) Source 3) Coupling 4) Slope 5) Sensitivity and Frequency AUTO, NORM TV-V, TV-H 6) External trigger Input inpedance Max. input voltage auto, norn, TV-V, TV-H INT ( CH1, CHz, VERT ) LINE , EXT AC for- 20Hz-ZMHzZAHz-ZAMHz INT (VERT)4.5 div Q.

14、 A)1.5 div (3.0) EXT0.2 llp-p0.8 Vp-p at Least 1 div or 1. 0Vp-p approx. 1 M-ohn 250V ( DC + paek AC ) ; 1) 2) 3) tC t , 1) 2) 3) I 1) 2) rE t 1) 2) 3) 4) 5) PARTSPECIFICATIONS * X-Y 0peration 1) X-axis 2) Y-axis 3) X-Y phase difference (same as CHl except Deflection factor ; Accuracy ; X5% Frequenc

15、y response; for the following) sane as that of CH1 DC to SAAKHz ( -3dBJ saneascHz 3 or less ( at DC to 50KHz ) * Calibrator (probe adj.)KHz(+ZAD frequency, 0.5V( XLT%) square wave duty ratio : 40 - 6A% * Power supply l) Voltage range 2) Frequency 3) Power consunption voltage rangefuse lAA(90-rlgv)/A

16、C2A25AU r20 (108 - r32V) / ACzA25AV 229 (r98 - 242V) / ACA25AV 244 Qrc - Z50V) / ACAz5AV 5A / 6AHz approx. 35W t 1) t Physical Charac. Weight Dimension 7.SKe 320 nn (W) x l4A nn (H) x 43A mn (L) r Environnental Charac- teri sti c 1) Temperature range for rated operation 2) llax. ambient operating te

17、nperature 3) Max. storage tenerature 4) Humidity range for rated operation 5) Max. anbient operating humidity +10 C to +35 C ( +50F to +95F ) 0C to +40 C ( +32 F to +104F ) -2ACb +7AC ( -+Fto+158F) 45% to 85% RH 35% to 85% RH -7- 2. ACCESSORIES (1) Operation nanual (2) Probe (option) (3) Spare Fuse

18、(4) Power cord -8- 3-PREVENTT VE MAT NTENAAICE Preventive maintenance, when perforned on a regular basis, can prevent instrunent breakdown and may improve the reliability of the oscilloscope. The severity of environnent to which this instrument is subjected will deternj.ne the frequency of naintenan

19、ce. A convenient tine to perform preventi.ve maintenance is preceding recalibration of the instrunent. Disassenbly Renove the screws in the top cover of the instrument. Gently seperate the top cover fron the instrunent and Iay aside. Most of the internal parts of the instrunent are now accessible. C

20、leaning 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 instrunent. Loose dust accunulated on these covers can be renoved with a soft clo

21、th or snall brush. Dirt that renains can be removed with a soft cloth danpened in a nild 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, low- veloci

22、ty strean of air. A soft-bristle brush or a cottontipped applicator is useful for cleaning in narrow spaces or for cleaning nore delicate conponents. Visua1 Inspection The instrunent should be inpected occasionally for such defects as brocken connections, improperly seated transistors, danaged circu

23、it boards, and heat-danaged parts. the corrective procedure for nost visible defects is apparent ; however, particular care nust be taken if heat-damaged conponents are found. Overheating usually indicates other trouble in the instrument ; therefore, correcting the cause of the overheating is inport

24、ant to prevent recurrence of the damage. -9- 4. CIRCTIT DESCF?IP:trION The block diagran ( page 43 ) shows the overall relationship between all of the circuits. Conplete schematics of each circuit are also given in section schnatics diagrans ( page 44 to 57 ). Refer to these diagrams throughout the

25、following circuit description for electrical values and relationship. ATTENUATOR CH1 ( CHz ) IT.TPUT AIPLIFIER CH1 ( CHz ) PREAilP 2, +4, +lA, +tAA circuit. +2, +4, =10 circuits are in RA101 ( RAIAZ ) and =10, +LAA circuits are between S101-AZ ( StgZ-AZ ) and 5101-82 ( SLg2-82 ). (2,3) Signal fron t

26、he input attenuator is connected to source follower Q101 ( 0105 ). When excessively high-anplitude signals are applied to the source follower, the signals wiII be Q103 ( 4106 ) and the gate-source junction of Q101 ( 0105 ). When 5801 is open ( x SMAG ), the signal that is feed back to 0P AMP through

27、 R109 anplfies the output signal of Q104 by 5 tines. And the signal of QZAG ( 0306 ) base is converted fron a single-ended simal to a paraphase signal by differential anplifier. Vertical preanp circuits provide control of vertical position. They also contain a stage to provide a sample of the input

28、signal to the trigger preanp circuit for internal triggering fron the CH1 or CH2 signal only. And the trigger preamp of CH1 provides the CH1 input simal to the horizontal anplifier in the X-Y position of the TIIIE / DIV switch. The trigger preanp circuit anplifies the internal trigger signal to the

29、level necessary to drive the trigger generator circuit. VERTICAL CONIBOL The vetical switching circuit determines the input signal or conbination of input signals to be connected to the vertical nain anp. Input signal combinations that can be displayed are selected by D FLIP-FLOP that is controlled

30、by the vert.ical node switches and the X-Y position of the TIME / DIV switch. In the ALT and CHOP modes, both channels are alternately displayed on a shared tine basi.s. _IA_ VERTICAL MAIN AMPLIFIER The vertical nain amplifier circuit provides the vertical deflection signal before it is deflection p

31、lates of the CRT. (7 ) the final naplification for applied to the vertical The Trigger Anplifier circuit produces trigger pulses to start the sweep generator circuit. The Trigger Generator circuit consists of the trigger source, trigger node switch, TV synchronization circuit, trigger amplifier, U10

32、9 and etc. The Trigger Source Switch selects one signal of the signals fron the vertical trigger preanps, 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.

33、 The signal type is AC. The Trigger mode Switch determines the operating mode for the trigger generator ci rcui t. In the N0RM node, the sweep signal is generated only the trigger signal is generated, 0peration in the AUTO, TV-V mode is the sane operation as N0RM mode, except that a free running tra

34、ce is displayed when a trigger pulse is not present or the aplitude of the trigger signal is not adequate. The Base Signal of Q130 which enters through three switches, Q34? and etc is amplfied by Q345, Q346. The anplfied signal, the collector signal of Q346, enters the N0.2 pin of U109, outputs in N

35、0.8 pin of U109. The N0.8 pin signal of U109 is called trigger signal or trigger pulse. TRIGGER AMPLIFIER SWEEP GENERATOR (8) (9) Sweep generator circuit consists of sweep gate circuit and niller integrator. The sweep gate is on, a very little negative going signal is generated in the gate of Q129,

36、input Miller Integrator, by R-C network. The signal in the gate of Q129 is anplified by Miller Integrator, the amplified sj.gnal appear in the Enitter of Q342, is caIed sweep signal and enters the Base of Q327 through R551. This sweep signal is generated on comnend ( trigger pulse ) fron the trigger

37、 generator circuit. The sweep gate circuit produces an unblanking gate to unblank the CRT during sweep time. - 11 - HORIZOT.ITAL OUIPIJT AilPLIFIER(12) The Horizontal Output Anplifier provides the final signal anplification to drive the CRT horizontal deflection plates. The Horizontal 0utput Anplifi

38、er consists of five cascade stage anplifiers. The first stage horizontal main anplifier has a low input inpedance and require very little voltage change at the input to produce the desired output change. The ouput signal fron cornplenentary arnplifier IZS, horizontal deflection plate. The output sig

39、nal from conplenentary anplifier e126, Q127 drives the right Q128 drives the left horizontal deflection p1ate. The Horizontal Output Anplifier has the horizontal magnification and the horizontal position functions. In all position of the TIIIE / DIV select switch except X-Y the input signa of the ho

40、rizontal output anplifier 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 Anplfier is the signal fron the channel I preamp circuit of the vertical deflection systen. POWER STIPPLY (14) The Iow voltage Powe

41、r Supply Circuit provides five regulated sources ( -tz Volts, *5 Volts, +12 Volts, *56 Volts, +I4A Volts ) and three unregulated source ( +195 volts ) used to operate the vertical deflection systen, horizontal deflection systen and cRT driving circuit. CRT CIRCUIT(13) The CRT Circuit provides the vo

42、ltage levels and control circuits to operate CRT. The circuitry consists of the z-axis amplifier, high voltage oscillator, high voltage regulator, high woltage rectifier and the CRT controls. The calibrator circuit produces a square wave output signal with accurate amplitude and frequency. This outp

43、ut signal available as a square wave Voltage at the PROBE ADJUST 0.bVp-p ( IIIlz ) connector. -t2- 5. CAI-IBRATI ON GoldStar Precision Co., Ltd. provides conplete instrunent repair and calibration. Contact the GoldStar Precsion Co., Ltd. office. 5-1. Calibration interval To naintain instrunent accur

44、acy, perforn the calibration of the OS-AZ4P at least every TAAA hours of operations or every six nonth if used frequently. 5-2. Test equipment required The following test equipment(Table 5-1 ; see page 23) and accessories. or equivalent, are requl.red for the complete calibration of the 0S-9020P. Th

45、e given specifications for the test equipnent are the ninimun necessary for accurate calibration. Therefore, the specifications of any test equipment used nust neet or exceed the list specifications. All the test equipment ia assuned to be comectly calibrated and operating within the Iisted specific

46、ation. Operating instructions for the test equipnent are not given in this procedure. Refer to the inst,ruction nanual for the test equipnent if nore information is needed. 5-3. Prelininary procedure This instrunent should be calibrated at an anbient tenperature of +ZAC ( t 5C ) for best overall acc

47、uracy. 1. Connect the instrunent to AC Iine voltage, Sa/6aHz line source. 2. Set the instrument controls as given in the preliminary Control Setting. Allow at least fifteen minutes of warnup before proceeding. 3. See the Adjustment Locations in the pulrout pages(see page 2E). -13- ControlsSettingsCo

48、ntrolsSettings Focus Midrange - HORIZOIITAL - O TRACE ROTATIONAs desi.redo H-PosrTrON Midrange O INTENSITY Midrange (E x1OMAG Normal - VERTICAL _ O TIME/DIV1nS VARIABLECAL V-POSITION Mi drange - TRIG - V_VARIABLE CAL(fully clockwise) LEVELMidrange, nonal INPUT COUPLING GND (AC-GND-DC) SLOPE+ (putt)

49、VOLTS,/DIV 5 mV,zDIV MODEAuto O V_MODE TRIG SOIRCE INT (CH1) C CHz INVERT Nornal 5-4. Preliminary control settings Preset the instrument controls to the settings given below, when starting the calibration procedures. 5-5. Initial starting procedure 1. 2. 4. Push the POWER switch. Wait a few seconds for the cathode ray tube ( CRT ) A trace should appear on the display of the CRT. If the trace disappears, increase ( clockwise ) the setting until the trace is easily observed Ad