Realistic-STA95-rec-sm 电路图 维修手册.pdf

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1、ruLtstd. SerulceamuaI STA.95 AM /FM STEREO RECEIVER Catalog Number: 31 -2082 cusl0M MANUFACTURED FoR BADIo SHACKEn ovstoN 0F rANDy coRponAloN RadioFans.CN 收音机爱 好者资料库 CONTENTS page 1. SPECIFICATIONS 3 all units should be able to approximate these-some will exceed and some may drop slightly below thes

2、e specs. Limit Specs represent the absolute worst condition which still might be considered acceptable; in no case should a unit perform to less than within any Limit Spec. BLOGK DIAGRAM lds sullVlds sul)v )o I ls tft 4 ?*? o-t t- x= :=ErE -.? ? 2 zA =E f E ; = 6-x- a - o -j = !tz ri - j q J t i ; 5

3、 ;F er I =ry =E tttrNvHJ lHS18IfNXVH III DISASSEMBLY INSTRUCTIONS 1. Removing chassis from Wooden Cabinet. (Refer to Fig. A) Remove five screws (#88 pilot lamp does not light. A) Faulty AC power cord Replace the cord. B) Defect in the power switch Replace the switch. C) Broken wire in the power tran

4、sformer Replace the transformer. D) Broken power fuse Replace the fuse. 2l Fuse blows when power is turned on.A) Power transformer T851 defective Replace the transformer. B) Short in the primary or secondary of the transformer circuitry Repair the short. C) Damaged rectifier D851 Replace the rectifi

5、er. D) Short-circuit in the rectifier circuit Repair the short. E) Short circuit in power transistor TR609a, b or TR610a, b Replace the defective transistor(s) and check circuit. 3) Pilot lamp does not light.A) Defective lamp(s) Replace lamp(s). B) Disconnection in the power transformer T851 tertiar

6、y winding Replace the transformer. 4l Pilot lamp lights but no sound from either channels. A) Resistor R801, R804 or R809 open Replace the resistor(s). B) Capacitor C801, C802 or C807 defective Replace the defective capacitor(s). C) Diode D851 damaged Replace the diode. D) Open in secondary winding

7、of the power transformer T851 Replace the transformer. E) Transistor TRB03 (open), TR804 (short), TR805 (short) or TR806 (open) damaged Replace the damaged transistor(s). F) Diode D801 (short) damaged Replace the diode. 5) A SPEAKERS do not work.A) Speaker switch SW9 defective Replace the switch. 6)

8、 B SPEAKERS do not work.A) Speaker switch SW9 defective Replace the switch. 12 SYMPTOMCAUSE AND REMEDY 7l One channel does not work with VOLUME at maximum, with a test signal applied to the center terminal of Volume Control VR902 of the dead channel. Defect in transistor TR901, TR902 or TR903 of Ton

9、e Amp Board 9035 Locate and correct the defect. Defect in transistor TR601, TR602, TR603, TR6O4, TR6O5, TR6O6, TR6O7, TR6O8, TR609, TR610, TR611 or TR612 of MAIN AMP Board 6052 Locate and correct the defect. Short in speaker output terminal Repair the short. Defective resistor R902, R903, R905, R906

10、, R907, R908, R909, R917, R921,or R922of TONE AMP Board 9035 Replace the defective resistor(s). Defective resistor R602, R603, R604, R605, R606, R607, R608, R609, R610, R613 0r R615 of Main Amp Board 6052 Replace the defective resistor(s). A) B) c) D) E) 8) Same as 7 above but channel operates when

11、test signal is applied as 7. A) Defective lC (1C501 NJM 4558D-D) Replace the lC. B) Faulty resistor R502, R503, R504, R510 or R511 of Pre-Amp Board 5042 Replace the faulty resistor(s). C) Faulty capacitor C501 or C506 Replace the faulty capacitor(s). D) Defective SELECTOR switch SW1 Repair or replac

12、e the switch. 9) Speaker works normally but headphones do not work. A) Headphone plug does not mate with jack Replace the plug. B) Defective resistor R651 Replace the resistor. 10) All the inputs work normally except AUX input. A) Poor contact in AUX input jack Repair or replace the jack. B) Poor co

13、ntact in SELECTOR switch SW1 Repair or replace the switch. 1 1) PHONO input not operative.Poor contact in PHONO input jack Repair or replace the jack. Faulty SELECTOR switch SW1 Repair or replace the switch. A) B) 121 TAPE MONITOR 1(or2) OUTnot operative. A) Defective contact in TAPE MONITOR 1 (or 2

14、l OUT jack Repair or replace the jack. B) Defective contact in TAPE MONITOR switch SW3 Repair or replace the switch. 13) FM does not operate.A) Transistor TR801 or TRB02 damaged Replace the damaged transistor(s). 13 SYMPTOMCAUSE AND REMEDY 13) FM does not operate. l) Transistor TR801 or TR802 damage

15、d Replace the damaged transistor(s). Resistor R801 defective Replace the resistor. Short circuit in Tuner B+ circuit Repair the short. Poor contact in SELECTOR switch SW1 Replace the switch. Resistor R304 defective Replace the resistor. Capacitpr C302 defective Replace the capacitor. Defective trans

16、istor TR201 or lC 1C201, 1C203 Replace the defective transistor or lC(s). Defective IFT T201 Replace the lFT. Defective resistor R203 or R208 Replace the resistor(s). Defective transistor TR101 ,TR102, TR103 0r coil L101, L1 02, L103, L104 of Tuner Board 0062 Replace the defective component(s). Faul

17、ty lead-in Repair or replace the lead in. A) B) C) D) E) F) G) H) J) K) 14) Poor multiplex separation A) lmproper adjustment Readjust T2O1 , VR301 and VR302. (Refer to MPX ALIGNMENT on page 9) B) Transistor TR2O2, TR203, TR2O4, TR3O1, TR302, TR303, TR304, TR305 or tC tC301 defective. Replace the def

18、ective component(s). C) Variable resistor VR302 defective Replace the variable resistor. 15) Stereo indicator LED does not light. A) Defective indicator LED D755 Replace the LED. B) lmproper adjustment of VR201 of Tuner Board 0062 Make readjustment. (Refer to MPX ALIGNMENT on page g) C) Defective lC

19、 1C301 or resistor R307 Replace the defective component(s). 16) FM volume not sufficient A) If volume of both L and R channels not enough: Front End defective, or faulty lC 1C201, IFT T201 or faulty capacitor C224, C301 of Tuner Board 0062 Locate and replace the defective component. B) lf sound of o

20、ne channel not enough: Defective L301 (Board 0062) in case of R channel, or defective L302 (Board 0062) in case of L channel Replace the defective coil(s). 14 SYMPTOM CAUSE AND REMEDY 17, AM does not operate. A)Damaged 1C401 of Tuner Board 0062 Replace the lC. Defective L4O1 , T4O1 , CF401 or T4O2 o

21、t Tuner Board 0062 Replace the defective component(s). Defective transistor TR401 Replace the transistor. Resistor R4O2, R409 or R411 defective Replace the defective resistor(s). Capacitor C416 or C419 defective Replace the defective capacitor(s). Selector switch SW1 defective Replace the switch. De

22、fective tuning gang Replace tuning gang. Damaged AM bar antenna Bepair or replace bar antenna. B) C) D) E) F) G) H) 18) LOUDNESS has no effectA) Defective LOUDNESS switch SWS Replace the switch. B) Defective capacitor C901, C902 or resistor R904 Replace the defective component(s). C) Defective VOLUM

23、E control VR902 Replace the VOLUME control. 19) Stereo-Mono not effectiveA) Defective MONO switch SW4 Replace the switch. 2Ol TAPE MONITOR not effectiveA) Defective TAPE MONITOR switch Replace the switch. B) Poor contact in TAPE MONITOR input jacks Repair or replace jack(s). 21 BASS control has no e

24、ffectA) Variable resistor VR904 defective Replace. B) Defective C908, C909 or R912, R913, R914, R91 5 Replace the defective component(s). 221 TREBLE control has no effectA) Variable resistor VR903 defective Replace. B) Defective C907, R910, R911, R916 Replace the defective component(s). 23, Excessiv

25、e noise with PHONO inputA) Faulty lC 1C501 Replace the lC. B) Defective capacitor C501, C506 or resistor R501, R503, R505, R506 Replace the defective component(s). 15 SYMPTOM CAUSE AND REMEDY 24, Noisy VOLUME control A) Defective VR902 Replace. B) Defective capacitor C506 or C903 Replace the defecti

26、ve capacitor(s). 25l, SIGNAL meter not functioning 26l, TUNING meter not functioning A) Defective meter Replace meter. B) Defective capacitor C402 Replace the capacitor. C) ln case of FM reception, lC2O1, TH201 or V R202 defective. Replace the defective component(s). D) ln case of AM reception, VR40

27、1 defective Replace, A) Defective meter Replace the meter. B) Resistor R226 defective Replace the resistor. 27) LO Fl Lter has no effect 28) Hl FlLter has no effect A) Defective switch SWB Replace the switch. B) Defective capacitor Cg14 Replace the capacitor. A) Defective switch SW7 Replace the swit

28、ch. B) Defective resistor R919 or capacitor C913 Replace the defective component(s). 16 NOTE: 1. This Receiver has built-in over load thermal protection for abnormal operation. When the temperature of thermal protector (installed with heat sink) does rise abnormally (9015C), the thermal protector wi

29、ll automatically cut out, and as soon as the temperature goes down suff iciently (35115C), the thermal protector turns back on automatically. lf the Receiver does turn itself off, check ventilation and speaker connections. r_, t_ SWlO r-1 Transistors TR611 and TR612 protect audio output stage when a

30、bnorma lly high current flows in TR609 and TR610 caused by excessive input drive, or too low impedance load is connected at output. lf increase of the current is excessive, the voltage across R622 and R623 will turn on TR611 and TR612 which are not normally biased on and collectors of these transist

31、ors (through D602 and D603 diodes) reduce biases on TR607 and TR60B which decreases drive to output transistors TR609 and TR610 to reduce the current. This occurs to protect not only the circuit but also the speakers against high level switching clicks and pop noises. POWEB TRANSFORI1EH T851 T SINK

32、OF POWEB TRANSISTOBS THEBMAL PROTECTOR AC 120V 6oHz - i = POWER lj-J CRB5 2. t = . 6 o F 17 0062 TUNER BOARD (TOP VIEW) 0062 TUNER BOARD (BOTTOM VIEW) 5042 PRE.AMP BOARD (TOP VIEW) PHONO AUX 5042 PRE.AMP BOARD (eorroM VIEW) AUX 20 6052 MAIN.AMP BOARD (TOP VIEW) :/ +.7 7- o -o- -r:-e- ) , ,_ 6052 MAI

33、N.AMP BOARD (BOTTOM VIEW) 21 7159 INPUT BOARD (TOP VIEW) *iti t 7159 INPUT BOARD (BOTTOM VIEW) OUT IN 8703a b for European models onlv kx iit*itl :,1ra!* I .:*d;l S;ri,?r ,.-3rif f*l ? *- | ri:l .- - -tl #., ,Et :r3l#) uitrsif,i. ;ii100/25V BEO6 s*?3: ri;, .18808 22K 8034 POWER SUPPLY BOARD (BOTTOM

34、VIEW) 23 9035 TONE CONTROL BOARD E ; = IIJ - o F F o g E l! I o- o E 24 SEMICONDUCTOR LEAD IDENTIFICATION 25 ELECTRICAL PARTS LIST CAPACITORS Ref. No. Value (F) Voltage (v) Toler- ance %l Material c21 6 c217 C21 B c219 c220 c221 c222 c223 c224 c225 c226 c227 c228 c229 c230 0301 c302 c303 c304 c305 c

35、306 c307 c308 c309 c31 0 c31 1 c312 c31 3 c314 c31 5 c31 6 c31 7 c318 c31 I c320 c321 c322 c323 c324 c325 0.47 p 47p 0.04p 10, 0.47 p 0.04p 1op 0.47 p lop 0.04p 0.04p 1p 3.3p 10p 1p 4.7 r, 41p 1 500P 0.22p 0.47 p 0.22p 0.33p 0.33rt 3300P 3300P Not Used 0.047 p 1 B()()P 1 800P 6800P 6800P *820P *B2OP

36、 0.1p 0.1p 1p 1p Not Used 2.2p 4.7 tt 50 16 25 16 50 25 16 50 16 25 25 50 25 16 50 25 16 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 25 16 +75 -10 +50 -10 +80 -20 +50 -10 +75 -10 +80 -20 +50 -10 +75 -10 +50 -10 +80 -20 +80 -20 +75 -10 +75 -10 +50 *10 +75 -10 +75 -10 +75 -10 t5 +75 -10 +

37、75 -10 +75 -10 x20 +75 -10 t10 110 110 t10 110 r10 t10 r10 r10 +75 -10 +75 -10 +75 -10 +75 -10 +75 .-10 +75 - 10 Electrolytic Electrolytic Ceramic Electrolytic El ectrolytic Ceramic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Electrolyti

38、c Electrolytic Polystyrene Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Polyester Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrol ytic Ref. No. Value (F) Voltage (v) Toler- ance %t Material

39、c1 01 c1 02 c1 03 cl 04 c1 05 c1 06 c1 07 c1 08 c1 09 c1 10 cl 11 c112 cl 13 c114 c1 15 cl 16 c117 c118 c1 19 c1 20 c201 c202 c203 c204 c205 c206 c207 c208 c209 c2t 0 c211 c212 c213 c214 c215 18P 22P 0.022p 0.51P 18P 10P 0.022tt 1 00P 0.01p 0.022p 0.51P 2P 18P 10P 33P 15P 0.022p 0.022p 0.47p 0.022p

40、0,01p 0.47 p 1 000P 7P 0.01p 15P 0.01p 1p 0.04p 0 04p 0.04p 0.04p 1 00P 0.04p 0.04p 50 50 25 50 50 50 25 50 25 25 50 50 50 50 50 50 25 25 50 25 25 50 50 50 25 50 25 50 25 25 25 25 50 25 25 t10 t10 +80 -20 r10 t10 t10 +80 -24 r10 +80 -20 +80 -20 t10 r0.5PF tS t10 tS r10 +80 -20 +80 -20 +75 _.1o +80 -

41、20 +80 -20 +75 -10 t10 r0.25PF +80 -20 t1P +80 -20 +75 -10 +80 -20 +80 -20 +8O _20 +80 -20 r10 +80 -20 +80 -20 Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Ceramic Ceramic Electrolytic Cer

42、amic Ceramic Ceramic Ceramic Ceramic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic *: 18O0P for European and Australian models. 26 Ref. No. Value (F) Voltage (v) Toler- ance (%l Material c401 c402 c403 c404 c405 c406 c407 c408 c409 c41 0 c411 c412 c41 3 c414 c41 5 c41 6 c417 c

43、41 8 c41 I c420 c421 c422 C501a,b C502a,b C503a,b C504a,b C505a,b C506a,b c507 c508 C509a,b C510a,b C511a,b c55 1 C60 1 a,b C602a,b C603a,b Not Used 22r, Not Used 0.01p 0.04p 5P 1op 4.7 p 4.7 p 1 000P 0.01p 0.01p 0.01p 10p 56P 0.01p 0.022p 0.04p 1p 0.01p 1p 0.01p 4.7 r, 1 00P 1 00p 6BOOP 1 800P 2.2p

44、 1 00p 1 00p 3.3p 3.3p 4.7 p 0.04p 2.2p 330P Not Used 6.3 25 25 50 16 25 25 50 25 50 25 16 50 25 25 25 50 25 50 50 25 50 6.3 50 50 50 16 16 50 50 25 25 50 50 +50 -10 +80 -20 +80 -20 r10 +50 -10 +75 -10 +75 -10 110 +80 -20 t10 +80 -20 +50 -10 t10 +80 -20 +80 -20 +80 -20 +75 -10 t10 +75 -10 t10 +75 -1

45、0 t10 +50 -10 t5 r5 +75 -10 +50 -10 +sO -10 +75 -10 +75 -10 +75 -10 +80 -20 +-75 -10 t10 Electrolytic Ceramic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Electrolytic Ceramic Ceramic Ceramic Ceramic Electrolytic Ceramic Electrolytic Ceramic Electrolytic Cer

46、amic Electrolytic Polyester Polyester Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Electrolytic Ceramic * C857:Use in place of CR851 Spark Killer Ior CSA models only Ref. No. Value (F) Voltage (v) Toler- ance (%l Material C604a,b C605a,b C606a,b C607a,b C608a

47、,b C609a,b C6 1 0a,b C611a,b C612a,b C613a,b C614a,b C61 5a,b C61 6a,b C617a,b c70 1 c80 1 c802 c803 c804 c805 c806 c807 c808 c851 c852 c853 c854 c855 (CSA Only) c856 (CSA Only) * C857 (CSA onlyl C901a,b C902a,b C903a,b C904a,b c905 47p 10P 6P 1 00P 1 000P 1 000P 56P 1 000P 1 000P o.1p Not Used Not

48、Used Not Used 22P 0.04p 8200s 8200p 1 00p 1 00p 1 00p 33r., 1 00p 1 000P 0.01p 0.01p 0.01rr 0.01p 4700P 4700P 0.022p 1 20P 0.027 p 1p 10P 47p 6.3 500 50 500 50 50 500 50 50 50 25 42 42 16 25 25 16 16 50 500 500 500 500 125 125 125 500 50 50 50 50 6.3 +50 -10 r10 r0.5P t10 t10 t10 t10 t10 t10 tl0 t10

49、 +80 -20 +50 -10 +50 _10 +50 -10 +50 -10 +50 -10 +50 -10 +50 -10 r10 t10 t10 tl0 t10 t20 t20 t20 t10 tl0 +75 -10 t10 +50 -10 Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Polyester Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electro lytic Electrolytic Electrolytic Electro lytic Ceramic Ceramic Ceramic Ceramic Ceramic Polyester Polyester Polyester Ceramic Polyester Electrolytic Ceramic Electrolytic 27 Ref. No. Value (F) Voltage (v) Toler- ance (A Material C906a,b C907a,b C908a,b C909a,b C910a,b C91 1a,b C912a,b C913a,b