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Sony XR-1790 Service Manual Download Page 8

– 8 –

FRONT  PANEL  ASS’Y

MECHANISM  DECK  SECTION (MG-36SZ9-32)

Note:

 Follow the disassembly procedure in the numerical order given.

SECTION  2

DISASSEMBLY

3 

top cover

2

1

2

1

4 

three claws

5 

front panel ass’y

4 

two claws

2 

two screws
(PTT2.6 

×

 6)

1 

connector
(CN901)

2 

two screws
(PTT2.6 

×

 6)

3 

mechanism deck section
(MG-36SZ9-32)

Summary of Contents for XR-1790

Page 1: ...MICROFILM SERVICE MANUAL FM MW SW CASSETTE CAR STEREO E Model SPECIFICATIONS XR 1780 Model Name Using Similar Mechanism XR 1790 Tape Transport Mechanism Type MG 36SZ9 32 ...

Page 2: ... 2 21 5 5 Printed Wiring Board CONTROL Board 23 5 6 Schematic Diagram CONTROL Board 23 5 7 IC Pin Function Description 26 6 EXPLODED VIEWS 28 7 ELECTRICAL PARTS LIST 34 Flexible Circuit Board Repairing Keep the temperature of the soldering iron around 270 C dur ing repairing Do not touch the soldering iron on the same conductor of the circuit board within 3 times Be careful not to apply force on t...

Page 3: ... 3 SECTION 1 GENERAL This section is extracted from instruction manual ...

Page 4: ... 4 ...

Page 5: ... 5 ...

Page 6: ... 6 ...

Page 7: ... 7 ...

Page 8: ...2 Note Follow the disassembly procedure in the numerical order given SECTION 2 DISASSEMBLY 3 top cover 2 1 2 1 4 three claws 5 front panel ass y 4 two claws 2 two screws PTT2 6 6 1 connector CN901 2 two screws PTT2 6 6 3 mechanism deck section MG 36SZ9 32 ...

Page 9: ... 9 MAIN BOARD HEAT SINK BRACKET MD 4 five screws PTT2 6 8 1 two screws PTT2 6 6 5 heat sink 2 two screws ground point 3 MAIN board 1 two screws P2 6 4 1 two screws P2 6 4 2 bracket MD ...

Page 10: ...TE HANGER X 1 two screws P2 3 4 motor ass y CAPSTAN REEL M901 3 main belt 2 sub belt 1 Remove the claw toward direction 2 Remove the return link toward direction 5 cassette hanger x 3 boss 3 boss 4 two claws 1 Remove the claw toward direction ...

Page 11: ... 11 CASSETTE HOLDER X A 1 Push an arrow A part 2 Removal the cassette holder x to direction of the arrow ...

Page 12: ... 02 0 06 oz inch FF REW CQ 201B 50 150 g cm 0 69 2 08 oz inch SECTION 4 ELECTRICAL ADJUSTMENTS TAPE DECK SECTION 0 dB 0 775 V 1 The adjustments should be performed in the order given in this service manual 2 The adjustments should be performed for both L CH and R CH Test Tape PB Head Azimuth Adjustment Procedure 1 Put the set into the FWD PB mode 2 Turn the screw and check the output peak value Ad...

Page 13: ...ts internal block is difficult to repair Note Adjust the tuner section in the sequence shown below 1 FM Auto Scan Stop Level Adjustment 2 FM Noise Focus Adjustment 3 FM Stereo Separation Adjustment 4 MW Auto Scan Stop Level Adjustment FM Auto Scan Stop Level Adjustment Setting TUNER button FM 1 FREQUENCY SELECT switch FM50 k Procedure 1 Tune the set to 98 0 MHz 2 Connect the digital voltmeter to T...

Page 14: ... of both channels should be equal Specification Separation more than 26 dB Adjustment Location See page 15 FM Stereo Level meter Level meter signal generator connection reading dB output channel L CH L CH A B R CH L CH Adjust RV4 on TU100 for minimum reading R CH R CH C D L CH R CH Adjust RV4 on TU100 for minimum reading FM RF signal generator Carrier frequency 98 0 MHz Output level 60 dB 1 mV Mod...

Page 15: ...1 MW Auto Scan Stop Level Adjustment TU100 RV2 FM Auto Scan Stop Level Adjustment RV3 FM Noise Focus Adjustment RV4 FM Stereo Separation Adjustment CN901 S1 FREQUENCY SELECT SWITCH 10 k MW 200 k FM 9 k MW 50 k FM TP2 SD SET BOTTOM VIEW SET UPPER VIEW ...

Page 16: ...s All resistors are in Ω and 1 4 W or less unless otherwise specified internal component 2 nonflammable resistor C panel designation U B Line Power voltage is dc 14 4V and fed with regulated dc power supply from ACC and BATT cords Voltages and waveforms are dc with respect to ground under no signal detuned conditions no mark FM MW SW TAPE PLAYBACK Voltages are taken with a VOM Input impedance 10 M...

Page 17: ... D 1 D602 E 1 D603 D 2 D605 D 4 D606 B 4 D607 E 5 D608 D 6 D609 D 2 D610 E 5 D611 D 3 D620 B 5 D621 D 5 D640 C 2 IC1 G 4 IC350 H 8 IC450 G 7 IC500 B 7 Q10 E 2 Q30 H 6 Q31 H 6 Q32 H 6 Q60 E 3 Q100 E 9 Q101 E 9 Q102 E 9 Q103 F 9 Q104 F 8 Q105 F 8 Q106 F 3 Q350 I 7 Q351 I 7 Q553 B 9 Q554 B 9 Q600 E 2 Q601 D 2 Q602 D 2 Q604 E 3 Q605 E 4 Q606 E 4 Q608 E 4 Q610 E 5 Q611 E 5 Q612 E 3 Page 23 ...

Page 18: ...XR 1780 19 20 5 3 SCHEMATIC DIAGRAM MAIN Board 1 2 See page 16 for Waveform ...

Page 19: ...XR 1780 21 22 5 4 SCHEMATIC DIAGRAM MAIN Board 2 2 See page 25 for IC Block Diagram Page 24 ...

Page 20: ...5 PRINTED WIRING BOARD CONTROL Board 5 6 SCHEMATIC DIAGRAM CONTROL Board Semiconductor Location Ref No Location D4 B 9 D900 C 10 D901 C 7 D902 C 6 D903 C 8 IC900 B 9 Waveform 2 IC900 OSC 2 2 Vp p 15 µs Page 17 Page 22 ...

Page 21: ... 32 27 28 17 18 DECODER LATCH CONTROL SHIFT REGISTER ROUT RFIN RFOUT RROUT RVREF VREF LVREF LROUT LFOUT LFIN LOUT R2 R1 TEST VSS NC CL DI CE L2 VDD L1 LT3 LT2 L10dBOUT LT1 LIN LCT2 LCT1 L10dBIN LSELO L3 NC RT3 RT2 RT1 RIN R10dBOUT RCT2 RCT1 R10dBIN RSELO NC R3 LVREF LVREF RVREF LVREF LVREF LVREF LVREF LVREF LVREF RVREF RVREF RVREF RVREF RVREF RVREF RVREF ...

Page 22: ... S1 19 AMP ON O Standby on off signal output to the power amplifier IC500 L standby H amp on 20 SEEK O Seek control signal output terminal H active Not used 21 SEEK O Seek control signal output to the FM AM tuner unit TU100 L active 22 LOCAL DX O Local DX selection signal output to the FM AM tuner unit TU100 L DX H local 23 24 O Not used open 25 T2 O Key matrix scan signal output for the frequency...

Page 23: ...pen 64 65 O Not used open 66 NC I Not used fixed at L 67 CE I Accessory switch on off detection signal input terminal L accessory off hold mode H accessory on 68 RESET I System reset signal input terminal L reset 69 KEY IN I Key matrix return signal input terminal A D input 70 IFIN I FM and AM intermediate frequency detection signal input from the FM AM tuner unit TU100 71 NC I Not used fixed at L...

Page 24: ... KNOB BALANCE WHITE RED Parts Color Cabinet s Color Ref No Part No Description Remark Ref No Part No Description Remark 1 GENERAL SECTION 9 7 11 12 3 4 5 6 8 3 2 2 2 2 2 F901 TU100 Front panel section MG 36SZ9 32 1 2 10 13 1 3 031 237 01 STOPPER LCD 2 3 031 238 01 PLATE GROUND 3 3 937 529 01 COVER FF REW 4 3 937 528 01 COVER EJECT 5 3 915 923 01 SCREW GROUND POINT 6 3 029 047 01 PLATE C GROUND 7 A...

Page 25: ...55 3 022 483 01 BUTTON EJECT 6 56 3 031 236 11 PANEL FRONT 57 3 924 404 01 DOOR CASSETTE 58 3 377 892 01 SPRING C DOOR TORSION 59 3 022 481 01 BLOCK B BUTTON DSPL 1 2 3 4 5 6 LCL 60 3 022 480 01 BLOCK A BUTTON SEL SHEEK MANU LOUD TUNER OFF 61 3 022 478 01 PLATE LIGHT GUIDE 62 A 3294 698 A CONTROL BOARD COMPLETE 63 3 022 471 01 PLATE LCD GROUND 64 3 024 264 01 ILLUMINATOR 65 3 022 482 01 PLATE LCD ...

Page 26: ...83 01 HANGER X CASSETTE 112 3 372 243 01 LINK B SELECTOR 113 3 392 954 01 SPRING 114 3 392 994 01 ROLLER PROGRAM 115 3 392 933 01 LEVER B CHANGE 116 3 392 948 01 SPRING 117 3 938 658 01 LEVER FF 118 3 938 659 01 LEVER REW 119 3 392 917 01 SPRING 120 3 392 935 01 ARM LOCK 121 3 372 242 01 BRACKET ASSY D LEVER 122 3 392 970 01 CHASSIS SWITCH DIRECTION SWITCH BOARD 123 4 908 792 11 SCREW B2 124 3 022...

Page 27: ...6 3 392 975 05 PLATE ASSY S HEAD 157 3 377 908 01 SHIM X ADJUSTOR 158 3 392 956 01 SPRING A 159 3 392 943 01 ROLLER FF 160 3 676 387 00 POLY SLIDER DIA 1 6 161 3 392 930 01 RETAINER SPRING 162 3 392 955 01 SPRING A 163 3 375 379 01 SCREW AZIMUTH 164 3 379 142 01 ARM B ADJUSTOR 165 3 392 984 02 GUIDE TAPE 166 3 377 909 02 LINK X ADJUSTOR 167 3 392 957 01 SPRING F 168 3 375 377 01 ARM F ASSY PINCH 1...

Page 28: ...SPRING 205 3 392 987 01 GEAR SELECTOR 206 3 392 990 01 GEAR DETECTION 207 3 676 387 00 POLY SLIDER DIA 1 6 208 3 392 944 01 COLLAR SELECTOR GEAR 209 3 375 131 01 SPRING GEAR LOCK ARM 210 3 392 989 02 ARM GEAR LOCK 211 3 392 937 01 GEAR B 212 3 570 615 02 POLY WASHER DIA 1 2 213 3 392 915 01 GEAR IDLE 214 3 392 986 01 ARM SENSOR 215 3 392 936 01 GEAR A 216 3 376 196 01 SPINDLE ASSY S REEL 217 3 375...

Page 29: ... 916 01 ARM ASSY TU GEAR 260 3 318 203 11 SCREW B1 7X6 TAPPING 261 3 701 437 11 POLY SLIDER A 262 3 590 768 00 RING A E 263 3 318 204 81 SCREW M1 7X3 TAPPING 264 3 375 381 01 BRACKET ASSY X CM 265 3 392 963 01 SPRING R 266 3 318 204 91 SCREW M1 7X4 TAPPING 267 3 375 376 01 MUTE PWB MUTE SWITCH BOARD 268 3 392 925 01 ARM A ASSY F R 269 3 392 939 01 ARM FF 270 3 392 934 01 ARM B F R 271 3 570 615 02...

Page 30: ... JC137 1 216 295 00 SHORT 0 JC901 1 216 296 00 SHORT 0 JC902 1 216 296 00 SHORT 0 JC903 1 216 296 00 SHORT 0 JC904 1 216 296 00 SHORT 0 JC905 1 216 296 00 SHORT 0 JC906 1 216 296 00 SHORT 0 JC907 1 216 296 00 SHORT 0 JC908 1 216 296 00 SHORT 0 JC909 1 216 296 00 SHORT 0 JC910 1 216 296 00 SHORT 0 JC913 1 216 295 00 SHORT 0 LIQUID CRYSTAL DISPLAY LCD900 1 803 137 41 DISPLAY PANEL LIQUID CRYSTAL PIL...

Page 31: ...00 ELECT 33uF 20 10V C358 1 163 021 11 CERAMIC CHIP 0 01uF 10 50V C359 1 163 021 11 CERAMIC CHIP 0 01uF 10 50V C360 1 163 133 00 CERAMIC CHIP 470PF 5 50V C450 1 124 584 00 ELECT 100uF 20 10V C451 1 115 339 11 CERAMIC CHIP 0 1uF 10 50V C452 1 126 160 11 ELECT 1uF 20 50V C453 1 126 160 11 ELECT 1uF 20 50V C454 1 163 009 11 CERAMIC CHIP 0 001uF 10 50V C455 1 163 009 11 CERAMIC CHIP 0 001uF 10 50V C45...

Page 32: ... SHORT 0 JC114 1 216 296 00 SHORT 0 JC116 1 216 296 00 SHORT 0 JC118 1 216 296 00 SHORT 0 JC119 1 216 295 00 SHORT 0 JC120 1 216 296 00 SHORT 0 JC122 1 216 296 00 SHORT 0 JC125 1 216 296 00 SHORT 0 JC126 1 216 296 00 SHORT 0 JC127 1 216 296 00 SHORT 0 JC129 1 216 295 00 SHORT 0 JC130 1 216 296 00 SHORT 0 JC131 1 216 296 00 SHORT 0 JC132 1 216 296 00 SHORT 0 JC133 1 216 296 00 SHORT 0 JC138 1 216 2...

Page 33: ...00 RES CHIP 4 7 5 1 8W R112 1 216 057 00 METAL CHIP 2 2K 5 1 10W R113 1 216 073 00 METAL CHIP 10K 5 1 10W R114 1 216 057 00 METAL CHIP 2 2K 5 1 10W R115 1 216 073 00 METAL CHIP 10K 5 1 10W R116 1 216 029 00 METAL CHIP 150 5 1 10W R118 1 216 295 00 SHORT 0 R119 1 163 059 00 CERAMIC CHIP 0 01uF 10 50V R120 1 216 061 00 METAL CHIP 3 3K 5 1 10W R200 1 216 073 00 METAL CHIP 10K 5 1 10W R201 1 216 081 0...

Page 34: ...2 2 5 1 4W R634 1 249 478 11 CARBON 2 2 5 1 2W F R635 1 249 478 11 CARBON 2 2 5 1 2W F R636 1 216 073 00 METAL CHIP 10K 5 1 10W R907 1 216 296 00 SHORT 0 SWITCH S1 1 571 478 11 SWITCH SLIDE FREQUENCY SELECT TUNER TU100 A 3282 019 A FM AM TUNER UNIT TUX 008 EA VIBRATOR X1 1 781 049 11 VIBRATOR CRYSTAL 4 5MHz MISCELLANEOUS 10 1 776 207 41 CORD WITH CONNECTOR POWER F901 1 532 877 11 FUSE BLADE TYPE A...

Page 35: ...COLLAR 1 503 K5X8 4 CORD WITH CONNECTOR 1 506 507 504 505 BUSHING 1 PARTS FOR INSTALLATION AND CONNECTIONS 501 X 3373 605 1 FRAME ASSY 502 3 012 601 01 COLLAR B 503 3 032 993 01 BRACKET LOCK 504 3 934 325 01 SCREW K 5X8 TAPPING 505 1 776 207 41 CORD WITH CONNECTOR POWER 506 3 702 658 01 TOOL REMOVE 507 X 3366 405 1 SCREW ASSY EXP FITTING ...

Page 36: ... 40 XR 1780 Sony Corporation Personal Mobile Communication Company 9 926 492 11 99D0525 1 Printed in Japan 1999 4 Published by Quality Assurance Dept ...

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