Scott-A417-437-457-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL stereo components 1411 SCOT The Name to listen to. H. H. SCOTT, INC., 20 Commerce Way. Woburn, Mass. 01801. Toi. 617 9338800 RadioFans.CN 收音机爱 好者资料库 -NOTICE- The following safety precoutions must be followed to assure conti111ued reliability and safety against fire ond shock hazard: .

2、,_ 1.) Replacement ports used during servicing of this appliance mwst hove identical characteristica os those offered aid recommended by R.R. Scott, Inc. 2.) Satisfactory end approved sorvice procedures dictte that ALL PARTS, no matter hOlol apparently unimportant, be replaced exactly os in the orig

3、inal design. EXAMPLES: o) b) c ) d) Braided gloss tubing over resistors. Hcotsinks on transistors, Ceramic tube spacers, All m echantcol ports, i.e. covers, brackets, screwe etc. 3.) A dielectric test is to be perfomcd on each appliance follOWing tho re-assembly end before roturning the unit to the

4、customer. 4.) The dielectric test, to be performed on R.H. Scott, Inc. electronic coponenta serviced in the U.S. and Canada for use in these countries, shall consist of not less than the foll011in,g:* l,) A dielectric tester designed,to supply not less than 1100 volts ac 60 llz and employing leakage

5、 current indicator/a 1a to be used, 2.) The tester is to be connected per the instruct ions enclosed with the instrument, or aa follows: a) The tester is connected to tho powc line recQptacle, ond the power switch is turned ON, b) Sufficient ti.me !.s allowed for the tester supply t o, stabilize ond

6、 then the output voltage is adjusted for 1080 volts. c ) Leads of the tester, usually ma eked GND ond HV, ore connected between chasais GND and both blades of the mole plug of the power cord. d) Switch tester to test and observe leakage indicator. LEAKJCE CURRENT MUST NOT EXCEED O.S cnA. * Dielectri

7、c tests made by .service personnel in countries other than United States ond Canada must use test equipment and procedures specified by the safety agency serving thot country. RadioFans.CN 收音机爱 好者资料库 EQUIPMENT SPECIFICATIONS A417 A437 .A4J7 *Power Output 25 Watts 42 Wacta 60 Watts Max. THD rated out

8、put 0.34 0.34 0.21. Max. IMD rated output 0.34 0.154 O. lt Input Sensitivity Phono 2.5 mV 2.5 cnV 2.5 mV Mic 6.0 mV 6,0 mV 6.0 mV Aux 160 mV 160 mV 160 mV Tuner 160 mV 160 mV 160 mV Signal Noise Ratio, weighted (input shorted) Phono 70 dB 75 dB 75 dB Mic 75 dB 80 dB 80 dB Aux 80 dB 85 dB 85 dB - Tun

9、er 80 dB 85 dB 85 dB - Tape 80 dB 85 dB 85 dB Frequency Response l Watt (1 dB) - Phono 20 Hz-20 kHz 20 llz-20 kllz 20 Rz-20 kHz -Aux. 16 Hz-32 k!v, 15 U7,:35 kUz 1S Rz-35 kHz Input Impedance - Phono 47,000 oh1HorUon meter 6. Audio Oscillator 7. Suitable tools, cables, etc. -Two 8 ohm resistive loads

10、, compensated for L ion 1000 Hz 100 Hz 10 kHz - Increase input 20 dB Crosstalk Aux Left Channel 1000 Hz High Note 3 dB incr-2d.B ease. Freq. to 100 Hz; Note 7 dB incre:,se. +2dB Set output for 0 dB. Read right cbaone l Min. output 45 dB down. I Mex. 1 dB change l kH z Lo Filter -8 d 2dB 100 Hz I Hig

11、h Filter -3 dB 10 kH I CONTROL TEST PUT SETTINGS Meters Aux Mono A437 l kHz Balance Aux Selector Control 1000 Hz Aux Left Tone Control Channel O Right Loud Switch Channel Off Volume Max Mode Switch Mono Ra1:monic* Aux Selector Distortioo 20 Hz Aux 1000 Hz Mode Switch 20,000 nz Mono 13alonce Equal ou

12、tput Volume Max AUDIO TEST PROCEDURE A417 AND A437 Serial No. SUFFIX PC OR PD TEST SCALE MEASURE AT EQUIPMENT SETTINGS POSITIVE PROBE NEGATlVB PROBE A C VTVM 301 Speake-c A Speaker A L or R G A C VTVM lV Speaker A Speaker A 11L or R G 8 ohm load 8 ohm load AC VTVM 30V Speaker A Speaker A Harmonic L

13、or R G Dist ortion 8 ohm load 8 ohm load Analyzer Note : Power line voltage 120V AC 2.04 llne THD. READINGS toL. W/output level at 18.3V both chaooels, Ampl-2dB ifier in normal operating posi- tion. Check ice control Note 45 dBdrop Min. in output. Checl attenuation botr channels . Chang Bond VOM l2m

14、A DC Spooker A Speaker A L or R C J_ DC Milli-lOOltlV Speaker A Speaker A voltmeter L or R C V0M 12mA DC Emitter of: Collector of: Q807 f A(.37 Q810 i A437 Q8l7 Q820 Q609 f A457 Q610 I A457 Q619 Q620 DOl rnV Sane 39 above Sa:ae above READINGS TOL. 12K :!:lK Mcaeure 40 Ohl!$ :tlK 38V DC /1437 5% 44V

15、DC A457 -38V DC 1437 51 -44f DC A457 +13V OC lOZ 1. 25 111A Max. 25 mV Max. Adjust pad for +100,: 0.21:QA DC nomin-0 111. 5mV +1001 -0 TE-ST lNPllr CONTROL SETTINGS Audio A ux Selector Level 1000 Hz Aux 8 ohm Mode Switch Mono Volume Max Tape Tape In Tape Monito1 I nputs 1000 B.z Switch tonitor Tape

16、Aux Soloctor Monitor Aux Output Volume Min Mode Switch Aux L Volume Switch 0.025V Max L Selector High 100 Hz Aux Filtor 10 kHz Mode Switch Mono AUDIO TESI PROCEDURE A 437 AND A457 Serial No, SUFFIX KC OR KD TEST SCALE MEASURE AT QJ1PMENT SE?tlNCS POSITIVE PROM: NEGATIVE PROBE AC VTVM lV Speaker A Sp

17、eekor A L or R C 8 oh:i lod 8 ohm 1011d t.C vtVM 11 Speaker /1. Spookc;r A L or R G 8 ohz load 8 ohca load AC VTVH lV Speaker A Speaker A L G 8 ob=i load 8 ohm load l AC VTVK lV Speaker A Spckcr A Scope L or R. G RBADINGS TOL. Adjust output 0 dB (0. 78V) Note: LOO Hz Boes boost lOdB Beaa cut lOdB 2d

18、B 10 kllz. Treble boost lOdB Treble cut lOdB Adjust output for OdB. Freq. to 10 kHz ; Note 3dB incre ose. freq. to 100 Hz; noto 7d8 incrcue. Set output for OdB, read right Min. channe 1 output 45 dB down. Max. l dB Change l ktlz. Low Filter 100 Hz :!:2dB -8clB A437 -3dB A.457 lligb_ FUtor 10 lBz -3d

19、B Both TEST INPUT CONTROL SETTINGS Meters Aux .ooo l kHz Balance Aux Selector Control 1000 Hz Aux Left Tone Control Channel O Right Loud Sw. Channel 110ff Volume Max Mode Switch Mono Harmonic* Aux Select or Distortion 20 Hz Aux 1000 82 Mode Switch 20,000 Hz Mono Balance Equal Volume 11Max AUDIO TEST

20、 PROCEDURE A437 AND A457 Serial No. SUFFIX K C OR KD TBST SCALE MEASURE AT EQUIPMENT SETTINGS POSITIVE PRO BE NEGATIVB PROBE A C VTVM 30V Speaker A Speaker A L or R G AC VTVM lV Speaker A Speaker A L or R G 8 ohm load 8 ohm load , . . l ,I AC VTVM 30V Speaker A Speaker A Harmonic L or R 11 G Distort

21、ion 8 ohm load 8 ohm load ;naLyzer . . Note: Powor line Voltage 1201 AC 2. line rBD, READINGS TOL. .1/output level at: 18.3V A437 21.9V A457 both cbanoe ls, amplifier in ,2dB normal open t - ing position, check UX Soloctor Monitor Aux Output Volume 11?1in11 Mode Switch Aux L Volu.e Switch 0.025V Max

22、 L, ( UI 0 0 2 . t ,., , I-, g . ,. . t, ( g H i ., ,. ,. , I! i: 9. ll 0 Q Ii , 0 N 0 .- ,. r ) - X H ,. 0 !. ,. - . V 0 Ill i . 1J t lI r- t 0 u (/) 00 A4 l 7 DRIVER/REGUWTOR Assy No. 100-1335-031 A417 TO.IB BOARD B Assy No. 100-1334-041 A417 PREAMP SWITCH BOARD Assy No. 100-1333-047 ti3. . 111 P9

23、J(; I ) - - ( CsI f :-: - a;on . . 1-=-_. ; ;: . r. -,r. : _:._t:, ., . - -V . . . . . . . . . )tX . .-._, itm,. A417 TON E BOARD A Assy No. 100-1334-033 t m.c. c- . . -r.:, . - 0 ., - . , t - ir -11.,-1/J.a i) sco ;); f V . .rJtJft;li;) ,1lJf J;zpz, .r ) f _ ti! ti . :,;ff . ,.,. nu111.-. 113 tiir,

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26、BOARD Assy No. 100-1335-034 A437 SPEAKER SWITCH. BOARD Assy No. 100-1352-043 UNIT Serial tfo. SUFFIX PC OR PD )I( e:n ,. , :!l . A437 PREAMP/SNIICU BOARD Assy No. 100-1333-048 A437 METER DRIVE Assy No. 100-1335-032 ,o ,. UNIT Se,ial No. SUFFIX PC OR PD A Al, 37 TONE BO,_,., Assy No. 100-1334-045 ft

27、B Al,37 TONE 80,uu, Assy No. 100-,.1334-046 UNIT Serial No. SUFFIX PC OK PD HO+ C I t: i.A r ff -L al. (t 1 . T- .,;T,1., WJ.; , A.t.L., . !tJil .,_ ., . a. 0 !- . . ;, zo : 1 A457 DRIVER/REGULATOR BOARD Assy No. 100-1335-033 j lt209 ,:., ., -.IQ. Q;,1 - - ;I -+ A457 MBTER DRIVE BOARD Assy No. 100-1

28、335-035 0 A457 PREAMP/SWITCH AJJsy No. 100-1333-049 A 457 TONE BOARD A Assy No. 100-1334-042 1t ii , fl;i1! *-1-mr,;:i;r ,1 A457 SPEAKER SWITCH BOARD ABsy No. 100-1352-045 A45 7 TONE BOARD B Asay No. 100-1334-043 NOTE: PRODUCT MAY .BE MA.fUFACTURED USING EITHER TONE BOARD B OR C A.457 IONE BOARD C A

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39、9700 l1PS 9750 MPS U56 MPS OSS 2SO 525 2SO 234 TIP 31B SEMICONDUCTOR OUTLINES MPS A06 MPS L5l MPS A55 LllC 547 2N 5400 2N 5401 i ll B 2SC 733 2SC 374 2SC 372 2SA 495 2SA 494 2SA 842 2SC lOOO 2S! 661 2SC 1166 2S0 371 2SD 428 SCHEMATIC DIAGRAM Model N A417 PNOMO a=.,.!L gn AUX I . At,1)(1 MOC uiS . CL

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