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P A R T S   L I S T

REF. NO.

PART NO.

DESCRIPTION

CODE

213

214

215

Knob, Power Switch

AE

Knob, Power Switch

A D

 

Knob, Tape Selector Switch/ AN

Dolby 

 

Selector Switch 

Knob, Tape Selector Switch/ AM

Dolby 

 

Selector Switch 

 

JKNBN0491 AFSA

Knob, Record Level Control AE

 

 AFSB

Knob, Record Level Control 

 

 

216

216

 

 Tape Counter

 

 Tape Counter

A K

A K

 

 

 

 

  

   

 

A

C

 

   

   

 

A

C

 

   

 

 

 

 

 

 

A

C

 

 

   

     

 

 

 

A

C

 

 

   

 

 

 ‘B u s h i n g ,   A C  

 ‘B u s h i n g ,   A C  

 

 

   

 Chassis 

   

   

 Chassis 

   

  

   Main Chassis 

      A M

   Main Chassis 

      A M

Front Panel Chassis

Front Panel Chassis

A T

A T

219

220

221

222

223

224

225

226

227

22%
229

230

231

232

233

234

235

A 2 3 6

237

23%

239

Front Panel Chassis

A T

 

Peak Level Display Meter

A E

Chassis

  W i r e   H o l d e r

A A

 

  R e c o r d   I n d i c a t o r /   A C

APSS Indicator

LH 

Holder, 

Peak 

Level Display

AC

Meter

Damper

A

D

 Rod, Record/Playback

AC

Selector Switch

Spring, Cassette Holder

A B

Spring (Plate type), Cassette

A A

Pressure

 Belt, Tape Counter

A B

PF 

Felt, Rear 

A A

PF 

Felt, Front Reg

A A

  H e a t   S i n k

A D

Sheet, Cassette Holder Cover AB

Shield Plate, Record Level

AC

Control

PSPAN0051 AFZZ

Spacer, Head Sink

A A

Spacer, Power Switch Knob

 

 25AFSD

Spacer, Power Switch Knob

 

 AC Supply Cord

AL

 

 AGZZ AC 

 Cord

AL

 

 Supply Cord

AC 

 Cord

AK

AC 

 Cord

   

 Supply Cord 

 

A G

   

Lug Terminal, 

A A

Lug Terminal, 

A A

 57AFFN Terminal, Ground

A B

Specification Sheet 

 

 AC

Specification Sheet

AC

 

  S h e e t  

  A B

PF 

Felt, Cabinet

A A

Spacer, Voltage Selector

A A

Socket 

 

2

4

1

242

243

REF. NO.

PART NO.

DESCRIPTION

CODE

 

 

 

 

 

 

 

 

 

 

 

   

 

 

 

245

LANG F041 

Spacer, Transformer

A A

Reinforcement 

 

246

Spacer, Front Panel Chassis

247

Rubber, Cabinet

24%

Shield Plate, Power Trans-

former 

 

249

 7CEFN

Stop Washer

250

Screw, Power Switch

Retaining

 Connecting Plug 

A B

 BAFZZ

Connecting Plug 

A A

 Connecting Plug 

AC

CNP4

 Connecting Plug 

A B

Connecting Socket 

A K

QCNW-1141 AFZZ

Connecting Socket 

A E

 Connecting Socket 

  C o n n e c t i n g   S o c k e t  

Connecting Cord, RCA-Pin

A H

QCNW-0727AFZZ

Connecting Cord, DIN Type, AP

75cm 

 

 

Connecting Cord, DIN Type,

150cm 

 for UK)

5 Lead of Jumper

A D

QCNW-1   

3 Lead of Jumper

AC

QCNW-11 

2 Lead of Jumper

A B

Jack, Headphones

A E

 Jack, Microphone Left

A E

 Jack, Microphone Right

Fuse, 

A E

 

 

 

Fuse Holder 

 

A A

 

s o 5

.

SW1 

SW2 IA, 

SW3 (A, 

SW4 

 

  ( A - D )

 

 

 

SW8

 

Sockets,

 2 Line Input

 Line Output

  S o c k e t ,   D I N  

A E

Record/Playback

 

 

 Voltage Selector

 

S w i t c h ,   R e c o r d / P l a y b a c k   A H

Selector

Switches,

 Input Selector

 

SW3; Dolby 

 

SW4; Tape Selector

AP

(Normal)

SW5; Tape Selector 

 

 Tape Selector (Metal)

SW7; Tape Selector 

 

Switch, Power 

 

 

Switch, Power 

A F

Switch, Muting

A E

Switch, APSS

A D

Switch, Bias

A D

Solenoid, APSS 

 AM

 

Solenoid, APSS 

A K

AC Adaptor

A F

QPLGA0251 AFZZ

AC Adaptor

Cushion, Packing Case, Left

Cushion, Packing Case, Right 

Packing Case 

A H

Packing Case 

 

A H

Summary of Contents for RT-31

Page 1: ...OLBY SYSTEM Noise reduction system manufactured under license from Dolby Laboratories Licensing Corporation Dolby and the double D symbol are trademarks of Dolby Laboratories Licensing Corporation RT 31 For SEC RT 31 H For SEEG SUK SCA and General RT 31 HB For SEW In the interests of user safety the set should be restored to its original condition and only parts identical to those specified by use...

Page 2: ... arrow direction n REMOVAL OF FRONT PANEL See Figures 2 4 and 2 5 1 8 Remove four screws from the front panel 2 Push down three stoppers at the upper surface of the front panel See that the front panel is now free from the stoppers Pull the front panel frontwards Figure 2 4 n REMOVAL OF MECHANISM BLOCK See Figures 2 6 and 3 l Note Be sure to open the cassette compartment lid before disassembling t...

Page 3: ...he unit is designed to operate from IIOV 22OV or 24OV AC mains Check the voltage selector setting on the rear panel before connecting with the AC supply cord Adjust the voltage selector to match your local AC power supply The voltage selector is located on the rear panel of the unit If adjustment is necessary use a screwdriver in order to turn the selector in either direction until the correct vol...

Page 4: ...is not satisfied adjust the pinch roller pressure spring by bending it or replace n TORQUE CHECK AT PLAY FAST FORWARD AND REWIND MODES 1 Put a torque measuring cassette into the set 2 The torque values in each mode must be as tabulated below n TAPE SPEED ADJUSTMENT 1 Using a test tape TEAC MTT 113C 8 kHz record ed play it back at the midpoint but not at the running start or end point 2 Connect a f...

Page 5: ...W6 4 Place the unit in record mode then see that VTVM is value 210 mV n RECORD PLAYBACK HEAD AZIMUTH ADJUSTMENT See Figure 5 3 1 Connect VTVM between the test point TP103 or TP203 and ground 2 Push the tape selector switch SW4 and set the Dolby NR switch SW3 at off position 3 Put a test tape TEAC MTT 114 IO kHz 250 pWb mm 10 dB recorded into the unit and play it 4 Adjust the head azimuth adjusting...

Page 6: ... selector switch SW2 at LINE position 3 Connect CR oscillator to the line input socket and apply the signal of oscillation frequency 1 kHz 316 mV 10 dB to the unit placing it in record mode 4 Adjust record level control VR102 or VR202 so that VTVM will indicate 580 mV 4 7 dB 5 Change the output level of CR oscillator from 316 mV 10 dB to 305 mV 10 3 dB then adjust the semivariable resistor VR601 o...

Page 7: ...5 Give the set 1 kHz signal 10 kHz signal and 12 5 kHz level control VR102 or VR202 so that VTVM will indicate 5 8 mV signal one after another then see that VTVM indicates the reading listed in Table 1 7 In the same manner as in the step 5 give the set 1 kHz signal 10 kHz signal and 12 5 kHz Consequently make sure VTVM indicates the reading listed in Table 2 ALIGNMENT POINTS Figure 7 l VHILA3160 1...

Page 8: ... 2SCl214C P70 I 2SA733K MARKING SIDE Specifications or wiring diagrams of this model L 7 2 I FILIOI FI L20 I NOTES 0 7 0 2 2SD794P 1 are subject to change for improvement without prior notice 3 I 4 5 I 6 Figure 9 SCHEMATIC c ...

Page 9: ...sed the symbol K used this symbol P means micro microfar specified ones for main taining the means 1000 ohm and the symbol M means and the unit of the capacitor without sur safety and performance of the set lOOOK ohm and the resistor without any symbol is microfarad A s t o electrolyt symbol is ohm type resistor Besides the one capacitor the expression capacitance wit with Fusible is a fuse type s...

Page 10: ...1 2 3 I 4 5 6 r E F G H rLiNE 1 _ r 1 2 3 4 I 5 6 I Figure 11 WIRING SIDE OF PRINT ll ...

Page 11: ...7 8 9 10 11 12 4 A AV II II I II II f h B 3 C D I I _ ____ A 1 E F G H 7 I 8 I 9 10 I 11 I 12 IF PRINTED WIRING BOARD RT91H HB 1 2 ______ _ _ __ _ ...

Page 12: ...70 I 2SA733K MARKING SIDE 301 0302 2SCl214C 0702 2507940 FILIOI FIL201 NOTES Pa PC se LoM SP sa Specifications or wiring diagrams of this model are subject to change for improvement without prior notice 1 I 2 I 3 I 4 I 5 I 6 Figure 13 SCHEMATIC DIL 13 ...

Page 13: ...ace these parts with symbols as K and M are used the symbol K used this symbol P means micro microfarao specified ones for main taming t h e means 1000 ohm and the symbol M means and the unit of the capacitor without suer safety and performance of the set IOOOK ohm and the resistor without any symbol is microfarad As to electrolytic svmbol is ohm Woe resistor Besides the one capacitor the expressi...

Page 14: ... s w I A r a a o mo mo c 3 a o 8 L N M _ C X J i i CT 1 t zf A x G c m 1 2 3 I 4 5 6 I Figure 15 WIRING SIDE OF PRI 15 ...

Page 15: ...7 8 9 10 11 12 i I ___ L _ __ _ __ I 11 SW I SWIZ PIPS SWlTCH BIAS SWlTCH 1 I II I 1 I LEFT MIC I I _1_ I 7 I 8 I 9 I 10 I 11 I 12 llTED WIRING BOARD RT 31 16 ...

Page 16: ...I TOP G n m 0 0 m D 1 BOTTOM Figure 17 MECHANISM EXPLODED VIEW ll In 0 0 m D ...

Page 17: ...1 2 3 4 5 6 I1 I Y 0 L t A 2 J 3s c p ii E F 01 504 3 1 A B C D E F G H I 2 3 4 5 6 Figure 18 CABINET EXPLODED VIEW Use of RTSlH HB 18 ...

Page 18: ...ansistors Diodes Zener Diode and LED described in this parts list they are different according to the Model RT 31 H HE or RT 31 A distinction is drawn between the abovedescribed items by description of the used units parenthesized NOTES Parts marked with Q I are important for maintaining the safety of the set Be sure to replace these parts with specified ones for maintaining the safety and perform...

Page 19: ... L B Y B T Y P E OWE R CIRCUIT TOP VIEW N C i OUTPUT 01 OUTPUT u INPUT REFERENCE OUTPUT N IN PUT INPUT Figure 20 I BLOCK DIAGRAM VHIIR3108 1 IC4 FRONT VIEW Figure 20 2 BLOCK DIAGRAM TOP VIEW Figure 20 3 BLOCK DIAGRAM VHIHA178M15 1 IC7 FRONT VIEW Figure 20 4 EQUIVALENT CIRCUIT ...

Page 20: ...1 2 I 3 4 5 6 _ b _ 2 i F G H 1 I 2 3 4 5 6 Figure 19 CABINET EXPLODED VIEW Use of RT 31 19 A B C D E ...

Page 21: ...ecord Level Control RVR M0328AFZZ 50K ohm B Record Sensitivity Adjust RVRM0263AFZZ 20K ohm B Bias Current Adjust RVR M0328AFZZ 50K ohm B Peak Level Display Meter Sensitivity Adjust ELECTORIC CAPACITORS VCEALAlCClOGM lOMFD 16V 120 RCEZA107AFl A IOOMFD lOV r20 RC EZA335AFl H 3 3MFD 50V 20 VCEALAI HW224M 22MFD 50V f20 RCEZV227AFl C 220MFD 16V 20 RC EZAlOGAFlC IOMFD 16V _20 VCEALAlHW104K lMFD 5OV lO V...

Page 22: ...cification Sheet RT 31 HI AC TSPCO740AFZZ Specification Sheet AC RT 31 HB TSPC0741AFZZ Specification S h e e t RT 31 A B PF LTB330AFOO Felt Cabinet A A PSPAB0103AFFW Spacer Voltage Selector A A Socket RT 31 H HB 2 4 1 242 243 REF NO PART NO DESCRIPTION CODE 245 h iTi d Lr lQ 2 in Str Pin j 1 q rr j_ I 6 lrpply Card RT31 H HB pY 1 245 LANG F041 ZAFZZ Spacer Transformer A A Reinforcement RT 31 H HB ...

Page 23: ...MSPRT0746AFFJ 080 MSPRT0747AFFJ 081 NBALS0006AGFJ 082 NBLTHOO76AFZZ 083 NBLTK0184AFZZ 084 NDAIR0150AFSA 085 NDAIROl51AFSA 086 NFLYCOOQOAFZZ 087 NGERH0066AFZZ 088 NGERH0067AFZZ 089 NGERP0051 AFZZ 090 NIDR 0073AFZZ 091 NIDR 0074AFZZ 092 NPLY ROO76AFZZ 093 NROLV0017AFZZ 094 NROLX0014AFZZ 095 NROLY0037AFZ Z 096 NSFTN0008AFFW 097 NSFTTOI 48AFFW A B A B A B A A A C A AG AE AP A A E A A D A B A A F A F A...

Page 24: ...A B AA A A A B A A A A A A AB A A A A A A A A AB A A A A A A A A 2 3 IREF NO R612 613 R701 R702 R703 R704 R705 R706 R707 R708 R709 R710 R711 001 PART NO DESCRIPTION CODE VRDST2EE822J VRDST2EEl03J VRD ST2EE152J VRDST2EE181J VRDST2EE822J VRDST2EE273J VRDST2EE121J VRDST2EE222J VRDST2EE223J V RDST2EE222J VRDST2EE223J VRDST2EE821J 8 2K ohm 10K ohm 1 5K ohm 180 ohm 8 2K ohm 27K ohm 120 ohm 2 2K ohm 22K ...

Page 25: ...eplacement item DUNTU0070AF03 M a i n C i r c u i t P o w e r S w i t c h Combined Assembly Circuit Peak Level Indi cator Circuit RT31 H HB DUNTU0070AF09 M a i n C i r c u i t P o w e r S w i t c h Combined Assembly Circuit Peak Level Indi cator Circuit RT 31 Figure 26 AC SUPPLY CORD WIRING CONNECTIONS SHARP CORPORATION OSAKA JAPAN SHARP ELECTRONICS CORPORATION Executive Offrce 10 Keystone Place P...

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