National SG -990A User Manual Download

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Summary of Contents for SG -990A

Page 1: ...MULTIPLEX STEREO RADIO PHONO WITH STEREO CASSETTE TAPE RECORDER MODEL SG 990A ee EXPORT DIVISION MATSUSHITA ELECTRIC TRADING CO LTD MATSUSHITA ELECTRIC INDUSTRIAL CO LTD P O Box 288 Central Osaka Japa...

Page 2: ...IDENTIFICATION PRINTED CIRCUIT BOARD 0 0c eee eee eee 10 13 CIRCUIT BOARD WIRING VIEW oc ee eee eee nee 14 ALIGNMENT INSTRUCTIONS TAPE RECORDER 005 Calacanis Succes 15 MECHANICAL ADJUSTMENT TAPE RECOR...

Page 3: ...ias Oscillator 2SB324 AC Bias Amplifier 2SB346 Equalizer Pre Amplifier two 2SB175 Equalizer Pre Amplifier two AN 203 SC 15 AFC OA90 AM D AGC OA90 AM Detector 0A90 FM Detector OA90 FM Detector pair 0A9...

Page 4: ...s Specification Plate SGN 420 Rubber Foot Rubber Foot SHG 314 upper SGH 314 Screw No 6 Screw No 10 Screw No 7 Screw No 8 Screw No 9 Fig 2 BOTTOM VIEW ar Pulley ROR 14 Tuning Shaft SDT 1324 ies Gaarene...

Page 5: ...ing screws Nos 1 10 as shown in Fig 2 2 Unplug 16 pin circuit board connector from cassette circuit board 3 Remove four 4 cassette tape deck red mounting screws Nos 1 4 and _ level meter mounting scre...

Page 6: ...rocedure N To Remove Baffle Board Refer to Figs 6 and 7 1 Remove four 4 rear cover mounting screws Nos 1 4 as shown in Fig 6 2 Remove four 4 speaker mounting nuts Nos 7 10 as shown in Fig 6 3 Remove s...

Page 7: ...79 80 174 172 8 145 2 3 18 4 10 12 5 6 13 8 14 15 9 16 17 135 134 19 20 75 52 2153 2255 24 25 142 120 26 27 28 3e Cc 80 81 14085 83 61 62 63 64 40 3839 41 42 65 43 44 66 67 45 39 46 47 70 71 72 73 481...

Page 8: ...3 89 88 9091 95 93 97 98 99106 103 105 136 108 111 112 116118117126128127 137 131 132 140 139 141 143 145 149 150 25 142 120 26 27 28 36 29 30 37 136 108 109 123 124 131 127 129 128 130 125 126 132 1...

Page 9: ...that provides 10 7 MHz center frequency and 400 kHz sweep width OSCILLOSCOPE Set sweep selector of oscilloscope to External Sweep Set band selector switch to FM Set function selector switch to RADIO...

Page 10: ...13 MPX Coil indication on VTVM from the left terminal through Left Side VTVM T11 MPX Coil side output when the right side of Output meter across Speaker Jack L Imp 162 CT3 FM OSC Trimmer Adjust for ma...

Page 11: ...EO re creeper ete RS Se ee ar tn a OE ect preredet eg A eee ee ee Ren at Steg Se TTS TNT ETTgTREY SIFT EET ETT MODEL SG 990A PARTS IDENTIFICATION Fig 14 IF FM AM AND MULTIPLEX SECTION 40...

Page 12: ...MODEL SG 990A PARTS IDENTIFICATION 8 Re it 1a1 e ae AT cin 06 e s oOo ee HERE A A aE 6 Fig 16 RF SECTION FM AM 44h...

Page 13: ...MODEL SG 990A PARTS IDENTIFICATION ae ye 4 rays e io 7 h a Fig 17 AUDIO SECTION 49...

Page 14: ...MODEL SG 990A f T14 AC Bias Oscillator TP a 8 0 Ves 9 Pe po fo 3 a eS g Ee S YY o wn oO i neg 8 a fo 5 S rom ke on _ a 2 Fig 18 CASSETTE TAPE SECTION 13 0000000 0 O Ore O TP7 R156 TPe6 R155...

Page 15: ...OQ wiite Ky blue rellow SkyblueTo SF 5 3 Grey TosF 6 4 yellow 70 sF S 38 QLbrown 7a SF 4 Back alece 7 P Jlereo Eye sky Blue wite 72 Pa 7e SE S 4 Wile ked ak Jo SE S 3 Y Sky Btve brown Te Py xs waite S...

Page 16: ...TO 70 70 Pra Connectop 2 To 1 Pin Connector3 cK nN x3 VS 58 VRs Vix 8 Z NY ize a ys 2 Control N 03 iN 16 Pa Connector An lonnector 2 pee Switch Qbrown fof Osy blw Function Sekector Switch 70 Pin Tack...

Page 17: ...on VTVM 1 Repeat steps 2 and 3 MODEL SG 990A 4 MODEL SG 990A MECHANICAL ADJUSTMENT TAPE RECORDER PINCH ROLLER ADJUSTMENT Refer to Fig 22 1 Switch set to PLAY 2 Pull pinch roller in the direction of a...

Page 18: ...y with the surface of the tape Panasonic C90 or C60 cassette 3 _ Fig 29 j Motor Mot Motor Eas a or 63 OW ore Motor 63 Switch 59 Switch 59 i Belt 38 Belt 38 Brake Operatin sppneie i 7 ait 6 Brake Opera...

Page 19: ...mm as shown in F jg 32 Mount dial drum with the mounting screw as shown in Fig 33 Note After dial drum is fixed make sure that if there is no back lash of dial drum s Tuning Gear i a NO GOOD b NO GOOD...

Page 20: ...e head should be increased in proportion to the frequency Res 69 are used for this purpose Lio 11 C72 73 are resonated to record ing or erasing bias frequency Lio 11 C72 73 are used to adjust recordin...

Page 21: ...tage To prevent deterioration of frequency characteristics record Jevel and erase a thermistor TH MT 10K is employed in the Bias Oscillator stage TRi9 and a diode Dis 181121 in the Bias Power Amplifie...

Page 22: ...RANSISTOR CIRCUIT SELECTOR COIL DEFECTIVE L10 OR L11 SW FAILS IN TO MAKE CONTACT OR SHORTS RECORDING MONITORING NO BIAS CURRENT OR EXTREMELY LOW CURRENT INOPERATIVE POSSIBLE NO SIGNAL CURRENT AT HEAD...

Page 23: ...T BAD CONNECTION BETWEEN HEAD AND CIRCUIT BOARD OR FAULT OF COUPLING CAPACITOR CLICK IS NOT APPLY TESTER PROBE CHECK VOLTAGE OF TRANSISTORS HEARD ON EACH TR BASE TO DETECT THE POINTS CHECK COUPLING CA...

Page 24: ...NOT ROTATE TAKEUP IDLER 55 BELT OFF MOTOR BELT OFF MOTOR PULLEY DIRTY MOTOR PULLEY HOLDING TAKEUP IDLER PRESSURE INSUFFICIENT TAKEUP REEL RUBBER DIRTY TAKEUP TENSION OF TAKEUP REEL INSUFFICIENT SCREW...

Page 25: ...MODEL SG 990A Fig 40 TOP VIEW Fig 41 BOTTOM VIEW _ 25...

Page 26: ...e the Circlip and Washer from the bottom of the Record Support Arm Spindle The Record Support Arm Assembly can then be removed from the top of the Unit 3 Pickup Arm Assembly The Unit should be disconn...

Page 27: ...98 25 MODEL SG 990A...

Page 28: ...Pickup ms 1 60 FU ETA108 Pickup Plate A Assembly 1 7 PUA 3TTCD Pickup Arm Assembly 1 61 FU JIKO60 Pickup Arm Raising Spindle Ass y 1 _FU PWFO5S A Washer Pickup 2 62 FU BCPOS5 Magnet Actuating Slide Sp...

Page 29: ...SMQ 42 Stud A WwY 2232 Erase Head 15 SMQ 228 Stud B Record Playback Head SMQ 230 Stud C Record Playback Head 17 SMQ 232 Coil Spring A WY 425Z2 Record Playback Head 19 SMQ 52 Spring D Head Panel Action...

Page 30: ...y 1 49 SMQ 92 Spring M REW Arm Assembly 7 1 50 SMQ 86 Holding Plate FF Idler Ass y 1 51 SMQ 108 Takeup Arm 1 52 SMQ 106 Spring N Takeup Pulley 1 53 SMQ 110 Clutch Wheel 1 54 SMQ 112 Clutch Felt 1 55 S...

Page 31: ...r XSN2 5 Screw 2mm x 5 REPLACEMENT PARTS LIST PART NO DESCRIPTION ae REMARKS TRANSISTORS TR1 2SK19 FM RF Amplifier FET TR2 28C920 FM Mixer TR3 2SC829 FM Oscillator TR4 28C829 Composite TRs5 2SC829 19...

Page 32: ...ISTORS ERT D2FGK750S Temperature Compensator Temperature Compensator INDICATOR Level Meter COILS AND TRANSFORMERS SLA 4P4 FM Antenna Coil SLD 4Y2 FM Collector Coil SLQ Y11G 2 FM IF Trap Coil SLO 4Y2 F...

Page 33: ...19 324104 128s ERD 14VJ270 272 1 4Watt 5 Carbon 7 3 4 R96 102 R12 ERD 14VJ470 ERD 14VJ560 ERD 14VJ121 1 4Watt 5 Carbon 1 4Watt 5 Carbon 1 4Watt 5 Carbon a R20 30 37 38 45 66 103 104 167 168 ERD 14VJ10...

Page 34: ...J104 100kQ 1 4Watt 5 Carbon 4 1 1 2 R31 134 137 ERD 14VJ154 150kQ 1 4Watt 45 Carbon 3 1 2 R2 14 ERD 14VJ224 220k2 1 4Watt 5 Carbon 2 2 R32 ERD 14VJ274 270k2 1 4Watt 45 Carbon 1 1 R36 ERD 14VJ334 330kQ...

Page 35: ...M05102M 4700pF SOWV 10 Styrol 2 2 5OWV 80 20 0 022uF 0 01 nF 0 01uF 0 001 uF 0 022uF 100pF 0 001 uF 5OWV 100 0 50WV 50WV 50WwV 20 20 420 1400WV 100 0 Mica Ceramic Ceramic Ceramic Ceramic Ceramic 50WV...

Page 36: ...R90 91 EVB Q0AA01D14 10kQ Tone Control R107 108 EVA Q0AA01G15 Balance Control R95 EVL SOAA00B13 FM Separation Adjust R33 EVL TOAAO0B23 AC Bias Contro R64 VARIABLE CAPACITORS CT1 2 4 ECV 5XR27B18S Tuni...

Page 37: ...4 Pilot Lamp Ass y 1 SWJ 38 Changer Power Lead 1 SWJ 40 Cassette Connecting Lead 1 XSN3 6RS Screw Chassis M tg 7 4 SPN 1026 Filter A 1 SPN 1028 Filler B 1 y aoe SQX 5366 Instruction Book 1 APPEARANCE...

Page 38: ...108 Dia Back Plate SBN 348 SBN 310 SBN 308 SGX 386 SHG 314 PART NO SY K 686 SGK 274 SYP 32 SYU 164 SGN 420 SYK 708 SYK 706 Knob Tuning Knob Volume Knob Selector Cover Power Switch Rubber Foot Bottom C...

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