Scott-R-306-307-307L-A-406-407-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL stereo components 1111 1117 131JL 1411 1481 ffi SCOT L The Name to listen to. H. H. SCOTT, INC., 20 Commerce Way, Woburn, Mass. 01801, Tel. 617 933-8800 RadioFans.CN 收音机爱 好者资料库 -NOTICE- The following safety precautions must be followed. to assure continued reliability and safety again

2、st fire and shock hazard: 1.) Replacement parts used during servicing of this appliance must have identical characteristics as those offered and recommended by H. H. Scott, Inc. 2.) Satisfactory and approved service procedures dictate that ALL PARTS, no matter how apparently unimportant, be replaced

3、 exactly as in the original design. EXAMPLES: a) b) c) d) Braided glass tubing over resistors. Heatsinks on transistors. Ceramic tube spacers. All mechanical parts, i.e. covers, brackets, screws etc. 3.) A dielectric test is to be performed on each appliance following the re-assembly and before retu

4、rning the unit to the customer. 4.) The dielectric test, to be performed on H. H. Scott, Inc. electronic components serviced in the U.S. and Canada for use in these countries, shall consist of not less than the following:* 1.) A dielectric tester designed to supply not less than 1100 volts at 60 Hz

5、and employing leakage current indicator/sis to be used. 2.) The tester is to be connected per the instructions enclosed with the instrument, or as follows: a) The tester is connected to the power line receptacle, and the power switch is turned ON. b) Sufficient time is allowed for the tester supply

6、to stabilize and then the output voltage is adjusted for 1080 volts. c) Leads of the tester, usually marked GND and RV, are connected between chassis GND and both blades of the male plug of the power cord. d) Switch tester to test and observe leakage indicator. LEAKAGE CURRENT MUST NOT EXCEED 0.5 mA

7、. * Dielectric tests made by service personnel in countries other than United States and Canada must use test equipment and procedures specified by the safety agency serving that country. RadioFans.CN 收音机爱 好者资料库 EQUIPMENT SPECIFICATIONS AMPLIFIER SECTION *Power Output . Max. THD rated output . Max.

8、IMO rated output Input sensitivity - Phono -Aux Signal-to-noise ratio - Phono -Aux Separation - Phono -Aux Damping Factor. POWER REQUIREMENTS Line voltage 60 Hz. 190W 15 lbs 6.8 kg 16.2 lbs 7.4 kg R306 190W 15 lbs , 6.8 kg 16. 2 lbs 7.4 kg 87.5 - 108 MHz 12 dBf (2. 2 pV). 30.3 dBf (18 V) 16.1 dBf (3

9、.5 V) 42.1 dBf (70 V) 68 dB 65 dB 40 dB 125W 125W 23 lbs . 23 lbs. 10.5 kg 10.5 kg 26.6 lbs 26.6 lbs 12.1 kg 12.1 kg -R307/L 87.5 - 108 MHz 12 dBf (2.2V) 30.3 dBf (18 V) 16.1 dBf (3.5 V) 42.1 dBf (70 V) 68 dB 65 dB 40 dB 7 to 15 V 7 to 15 JJV 7 to 15 V . 7 to 15 V 515 - 1620 150 V Im 35 dB 50 dB 2%

10、kHz 515 - 1620 kHz 150 V/m 35 dB 50 dB 2% * Per H. H. Scott, Inc. output power statement as required by the Federal Trade Commission. * 40 Hz - 20 kHz. 2 RadioFans.CN 收音机爱 好者资料库 8 DIAL CORD STRINGING INSTRUCTIONS-R306 1.) Start with tuning capacitor plates fully meshed; tuning drum turned all the wa

11、y toward front of unit. 2.) Tie dial cord end to eyelet on tuning drum spoke closest to front of unit. 3.) Bring dial cord through inside slot of tuning drum. 4.) Follow arrow direction to pulley A; wind cord around flywheel capstan 3 full turns clockwise. 5.) Continue to pulleys B, C and D. 6.) Win

12、d cord around tuning drum 2 1/2 turns clockwise. 7.) Attach spring to cord; bring cord through outside slot of tuning drum and attach spring to eyelet of spoke. 8.) Set pointer at O log and attach cord to tabs. 9.) Rotate tuning knob in both directions to check for satisfactory pointer travel and di

13、al cord tension. 10.) A drop of suitable glue on pointer tabs is suggested to prevent slipping. FLYWHEEL CAPSTAN . . 3 DRUM D C l D DIAL CORD STRINGING INSTRUCTIONS-R307 1.) With rear of unit facing you, turn front end drum all the way to the right. (plates open) 2.) Form fixed loop on one end of di

14、al cord and attach to tab at inside top of front end drum. 3.) Bring dial cord through slot and follow arrows to pulley A, B, C and D. 4.) Wrap cord 3 full turns around flywheel capstan, counterclockwise, and return to front end drum. 5.) Wind cord 2 turns around drum, clockwise, and attach to sprin

15、g end protruding through slot in drum. 6.) Attach pointer to dial cord at tabs. Rotate tuning knob for satisfactory pointer travel and dial cord action. A drop of suitable glue on pointer tabs will prevent slipping of pointer. - FLYWHEEL CAPSTAN FRONT END DRUM 4 - B t A CIRCUIT DESCRIPTION OF THE PO

16、WER AMPLIFIER Refer to schematic diagram Q506 and Q510 are the power output devices and QSOS and Q509 are the drivers. These transistors provide current gain to drive the loudspeaker load. The differential input transistors, QSOl and Q502, along with the voltage amplifier, Q503, provide the necessar

17、y voltage gain and feedback to minimize distortion. Resistors, R505 and R506, control the amount of negative feedback and the gain of the driver. Q504, with resistors R507, R508 and R509, set the bias in the output stage to maintain class AB operation and prevent crossover distortion. Q507 and Q508

18、are the protection transistors. The protection transistors will conduct when the AC voltage drop across R516 and R517 exceeds a preset level. This level is determined by R512, R513, R515 and R518. When the protection transistors conduct, they provide a short circuit signal path, that in turn, limits

19、 the signal drive on the base of QSOS and Q509. a+ P501 PSOZ. (50 o-,!-j -VVv-+-+-+- R:,OZ. 0501 RS03 + C.52. I QSOG. PS04 HEp,._Q P-QC R.:.10 LI 2.:1,.,_I- -rr, f505 H-+-+-VV-t-+-+-+-t-._.-.,I/Vlr+-G SP R.52.1 504 I c,o, I QSO:) +Ic.52.2. 5 RECOMMENDED EQUIPMENT 1. AC vacuum tube voltmeter 2. DC mi

20、llivolt meter or DMM 3. Oscilloscope 4. Volt-Ohm meter 5. Harmonic Distortion meter 6. AM Signal Generator 7. FM Signal Generator 8. Multiplex Generator 9. Audio Oscillator 10. Standard AM dummy antenna (200 F ceramic or mica capacitor) 11. Standard FM dummy antenna for 300 ohm balanced input (see c

21、ircuit, Figure FM-1) 12. Suitable alignment tools, cables, etc. 13. Two 8 ohm resistive loads, compensated for L Q817 Q820 nominal 100 F R809 or R832 DC Milli-Adjust for +100% 40 C of A406/7 volt meter :. mV DC 5 mV -0 AUDIO TEST PROCEDURE CONTROL TEST SCALE MEASURE AT TEST INPUT READINGS TOL. SETTI

22、NGS EQUIPMENT SETTINGS POSIT IVE PROBE NEGATIVE PROBE Audio 1000 Hz Selector AC VTVM 30V Speaker 4/:1 Speaker 4/:1 Adjust input Level Aux. Aux Scope 5V/DIV H O for: With 8 ohm Mode Switch 8 ohm load 8 ohm load 10.9V R306/7 input Mono 10.9V A406/7 +2dB Volume at outputs. - Max. Repeat for Speaker Inp

23、ut level -2- should be .15V. Output not clipped w/117V AC line. Tape Tape In Tape AC VTVM 30V Speaker :/fl Speaker 1fl Output 10.9V Inputs 1000 Hz Monitor H O with input of Input Switch 8 ohm load 8 ohm load .15V +2dB - Monitor Tape Aux Selector AC VTVM lV Tape Out Ground Output of .15V Monitor Aux

24、with input of Output Volume .15V Min. Frequency Aux Tone Control AC VTVM lV Speaker :/fl Speaker :/fl Adjust input for Response Flat H O OdB (.775V) out. Power Amp Volume 8 ohm load 8 ohm load (3dB down points +ldB - and Max. should be below Tone Control Adjust Bal. 10 Hz and above for center 30 kHz

25、) Tone Aux Selector AC VTVM lV Speaker 1fl Speaker 1fl Adjust output Control 1000 Hz Aux H O for OdB (0.78V) Response Mode Switch 8 ohm load 8 ohm load Note: 100 Hz Mono Bass boost lOdB Tone Control Bass cut lOdB Flat 10 kHz +2dB - Treble boost lOdB Treble cut lOdf AUDIO TEST PROCEDURE CONTROL TEST

26、SCALE MEASURE AT READINGS TOL, TEST INPUT SETTINGS EQUIPMENT SETTINGS POSITIVE PROBE NEGATIVE PROBE Loudness Aux Selector AC VTVM lV Speaker #1 Speaker 1/:1 Adjust output Compensation 1000 Hz 11 Aux H O for OdB. Freq. 100 Hz Tone Control 8 ohm load 8 ohm load to 10 kHz; note 10 kHz Flat 3dB increase

27、, +2dB -Volume Freq. to 100 Hz - Increase 11 Oclock note 7dB incr- input Loud Sw. ease, 20dB On Crosstalk Aux Selector AC VTVM lV Speaker 1fl Speaker 1fl Set output for Left Aux H O OdB. Read right Channel Tone Control 8 ohm load 8 ohm load channel output Min. 1000 Hz Flat 45dB down Loud Sw. Off 0 V

28、olume Max. Mode Switch Stereo Balance Aux Selector AC VTVM lV Speaker 4fl Speaker 4fl Set output for Control 1000 Hz Aux H O OdB. Rotate Left Tone Control 8 ohm load 8 ohm load balance control Channel Flat note 45dB drop Min. Right Loud Sw. in output. Chk Channel Off attenuation Volume both channels

29、. Max. 11 Change inputs. Mode Switch Mono AUDIO TEST PROCEDURE CONTROL TEST SCALE MEASURE AT READINGS TOL. TEST INPUT SETTINGS EQUIPMENT SETTINGS POSITIVE PROBE NEGATIVE PROBE Harmonic* Aux Selector AC VTVM 30V Speaker 4/:1 Speaker 4/:1 Set output to Max. Distortion 20 Hz Aux Harmonic H O 10.9V 0.3%

30、 1000 Hz Mode Switch Distortion 8 ohm load 8 ohm load Measure distor:- THD 20,000 Hz Mono Analyzer tion. Balance 0.3% THD Equal or less Volume (R307 /L See Max. spec. P-2) Damping Aux Selector AC VTVM lOV Speaker 1/:l Speaker 1/:1 Set output to Factor 1000 Hz Aux H O 8V. Remove load Mode Switch 8 oh

31、m load 8 ohm load ! (:;, . . . ,. , . . ,y. ,:i;,., A ii ,.:-.Ji ?4 I R306 PUSH SWITCH BOARD Assy No. 100-1352-039 R306 POWER AMP/PREAMP Assy No. 100-1349-019 R306 TONE CONTROL BOARD Assy No. 100-1334-036 N . R306 TUNER BOARD Assy No. 100-1351-010 R307L TUNER BOARD (LW) Assy No. 100-1351-014 R307/R3

32、071 PUSH SWITCH BOARD Assy No. 100-1352-040 R307/R3071 POWER AMP/PREAMP Assy No. 100-1349-020 R307/R3071 TONE BOARD Assy No. 100-1334-037 POWER BO. II R307 TUNER BOARD (MW) Assy No. 100-1351-011 MODEL R307 MODEL R306 PRODUCTION CIRCUIT CHANGES 1) Change regulator pass transistor from MPS A05 to FT 5

33、321 2) Production units were also built using MPS AOS (with heat sink) but with tereo indicator supplied through 1.2K. R555 changed from 10 ohm, 0.5W to 22 ohm, 0.5W. 1) 270 ohm resistors were added between collector of Q503 and Q513 and the base of Q505 and Q515. Add capacitor C526 and C527 for sym

34、etrical clipping with 4 ohm loads. 25 DIAGRAM SCHEMATIC R306 Model No. r PH ONO . 26 l-1 USED ONLY FOR CANO F-l,F-3 a F-4 VALUE WILL IE CHANG!O IY IC X2 TOK04402 HA 1137 Rll9 470 Rf83 5-6 K : :g: :IO DI09NON 2.2K NON IOOK 1/50 co 0062 0,c,3 ffR 1NSlTIVITY WILL cH.t.NHo BY ME -!. VALUE roo AM. 290 AJ

35、A . HK IOI( : K MEASURED SHOWN THUS: PRIAT POSITION. 4, 0, C. v;:. SWITCH IN THE APP WITH SE NSFORMR rr .:E- _ YELLOW 120V PHONE 240V 220V , factory No. 1 Product Mfgd by suffht KB or KC 1-fld by S/N JACK 120V 60Hz 125W MAX. ,., -.J I P12l fli ,o tJg Lie_! - j_ LIS 111H c,n Io 047 -. 0 0 I IT LAMP 0

36、101 lil,11 iii 0107 Cl52 W,I Cl!51 I oOOr Ml Pll4_1.;_T.;. _ _ 0 _, 11 DIE-EMPHASIS JUMPIER Cl42 a Cl45 GH0-75pS Cl4J 8 Cl41 8H0-90,uS 0PH -H,d :s: (/) 0 C) p. :i: (1) to:! I- ZH 0 H C) :;i.:, t1 WH OP:,. -.JG) PIH -r A-:Q-0 C3 4556 TUNIR lD K40110 j TO TArE R IN T4P( LIN TAPE: L OUT QIOI -2Sk 1eY O

37、ftZSk 19GR ouu.0101- -c o 0104-csao1e, 0101, 0101,0,01,0101-cs ao1c OR i1cJ141L OR MPI 1114C 0101,0102, 0101- - -IHI0 OlOJ,0104,O1O15,01O7- -C:DG N Oft IIIAl50 0101- - - - - -1-EO, FLVl/7 IC IOI- - -UAIOH OR LMJOH Olt HAIIJ7 ICIOI-ULN2244 OAU4758 OR LMIIOO 1CIOI-_-:.-:=U.t.720 OALM1820 TQ TAPE OUT I

38、t T4PlOUTL . o -7 - I I/ / SIGNAL METIER -, _ -; 47/63 0201, Q20:Z1Q:ZOl,O:ZOl,03010QJOJ-MSHDC O 21CIOOOIL Q:SO:Z1 0100 0301-COG24 ORM.t.150 TAPI IN olio. . ONOL rio:-;. c!.!ia-I 0-r. ., PIOI 1111 :i POWUI-lQ -SUPPLY 80 K 401701 - oeo1,oeo1, oen,0012, 0011-al J74IL oso4, CMU4, aso10ael1-11 N.JOK Q!5

39、011 Q!513-MPIA!56 0501, 0911 -MPIHIOU Q!50t, Q!51t-IIIPIO5 CIIHI OSOS, IS,-MPSAOSCIIIIO 0501, 0510 QSll,0920-TIPIII OR zsoeze Q521 -MPSU0I FT!S!ll DOOi, OSOJ, 0504, 0505, D5060 D507,- - CD OON, MAl!IO, COG 24 oooe, os1 o 0611 ,0s12,0s11, 0614-IH002(1A IOOV) AUX L AUX Pl:ZO PIH f i 1 ! I 1 ;:l; ; l T

40、 -Il l ! 0 0 PI04 . K!t0181 8Y/1501tA JC a 1.0V A1 SIi II TO PO OOWER SUPPI.Y Ml Tl O -;IUaiDONLv ,011-cANADA , 1. ,-1, ,_,. PII TA-;-,:;H * J UH0 ONLY ,011 CMIIDl a U8A -JUltPU FORACl:ZOV -JUMPER ,oRAC220V Product Mtgd by factorr Na.I ldentlf br S/N suffix KC or KO 120V 60Hz 125W MAX. Wlltf lllr IW

41、G all I l-2 YALU( 12Ov 1 2ut12e NORM. BLOW 220V IN:ZISO HORII. BLOW PS041 *4 CIOI 00047/ZIOVAC ,ott rUIIOPI 0-0041/leOAC ,01t UI /CANADA caoz-00041/250YAC ,011 fUltON ONLY rlTl iF1-rl ! 01 I E ii JI ! a . e i !: 0 ,. 0 JL IPHKH I 00 ST. LAP J! DIN UNIIIULATID I+ TOPIOI 1/IW Plllf IT LAMP Pll4 TP . A

42、M GND OHM TO TAPI IN FM I PI03 PIHi L13 lN . Cl?! 10047 ,. ;.1. urx -, . D107 0 1 Gl SCHEMATIC DIAGRAM Model No, A406 TAPE i- P60I r,le,3,.28 _ _._._ IL P,- . . .,., ., -iii ID u ., ., I 1 .,. I I .,. I I I I I L- - - -_I -_ NPA-02A _ _ _ _ J TAPE IN/ OUT EARTH BR CL 0 0 CR 0 L IN R IN DL 0 DR 0 P40

43、1 AL r-: -410 -., I P406 I I +l:S.5V C401 I Y4.7I I I R420 . 0 . . ., r- 1 . -1:.ll.Lll.l._, I f I 13.5 R902 r-VV-+-loa-e-r.1 REG l/2w 10 I 7.4 I I I I : u, N I I P903 1 100 I -28 VDC I - I L _ NPS-01 -_ -_ J P902 LINE FUSE F-1 RD 20VAC YEL RO 20 VAC ev 60mA PHONO TUNER AUX TAPE AC 100/ 120v 1.5A SL

44、O BLO AC 220/240 0.75A SLO BLO F-2; F-3 2.5A FAST ILO I : I _ NPS-03 _ : _ _J 29 AC MAIN 120V 60Hz 190W NOTE: POWER TRANSFORMER SHOWN CONNECTED FOR 110 VAC. SCHEMATIC DIAGRAM Model No. A4 07 EL r I r- P601r1l.13:.!5!.YV-1-1 1 -tro- I I I I A70l 0 2 ,0 N 0: I P6 I 13.5V : i I I I I I N 0: N ., 12 . 0

45、: ., R702 -_-i-7 0-1nt I 5 +lH19 +13.5V zzo R 708 IK I I I I I I I I P710 P709 1uJ : R V I P706 i I I l I I VRMZA VR 701 B IOOK IOOK R712 IOK R718 IK -OIB _ J L., _ _ I I I I I I I I I I I VR702B NPT:.OJ- -_ 10J2- r- I I I I I I I I I I I I I I I I LOUD JL 0 -1 0 JR MOOE OUR 0 I I I I I I I I I I - I I I I l I I I I I CBOZ RS01 0: PB03 C ,sov I -.- I I I I I I I I . ii, 0: . . 0806 MA I ., I 2 ! ., ,., -. N._, 0: _, N : N , IN I I.- KL ?KR /L ! ML J bMP J I I r-rnR-02A OR ER SL 0 PHONO SR 0 BL 0 TAPE IN/ OUT L IN R 1111 BR CL CR 01:, 0 IL P?r-: TUNER AUX TAPE - -