Sony MDR-RF920R Service Manual Download Page 11

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MDR-RF920R/RF960R

4-1. BLOCK DIAGRAM

RX-BASE BOARD

L301

OSC

D301

REG

R-CH

MUTE

Q303

FM FE

L302

REG

IC303

IC305

SWITCH

Q302

Q304

RV301

FREE RUN

FREQUENCY

IF AMP/DECODE

IC301

ANT301

ANTENNA

R-CH

SP1

SPEAKER

L-CH

SP2

SPEAKER

R-CH

D304

S101

(AUTO ON/OFF)

–

B+

POWER

BATTERY

CHARGE

TERMINAL

(TO TMR-RF960R)

RECHAGEABLE BATTERY

NICKEL

(METAL HYDRIDE)

BP-HP550

S301

TUNE

RF960R MODEL

RF920R MODEL

RV303

TUNE

VOL

OSC

RF AMP

MIX

CT1

FE UNIT

(FRONT END)

Q10

D/A

D-FF

BATTERY
VOLTAGE

DETECT

IC201

B+ SWITCH

Q201,202

S101

D201

S201,202

CLOCK OSC/COUNTER

RV302

L301

RECEIVE

FREQUENCY

S201,202

RECHAGEABLE BATTERY

DETECT

DRY BATTERY

SIZE "AAA"

(IEC DESIGNATION R03)

2PCS, 2.4V

• R-ch is omitted due to same as L-ch
• Signal path.

: FM

: AUDIO

SECTION 4

DIAGRAMS

Summary of Contents for MDR-RF920R

Page 1: ... in the MDR RF920RK MDR RF960R is the component model block one in the MDR RF960RK MDR RF920RK MDR RF960RK Wireless Stereo Headphones MDR RF920R MDR RF960R Transmitter TMR RF960R TMR RF960R COMPONENT MODEL NAME FOR MDR RF920RK MDR RF960RK Headphones Power source Supplied rechargeable nickelmetal hydride batteries BPHP550 or commercially available size AAA dry batteries Mass Approx 270 g 9 6 oz inc...

Page 2: ...CAL PARTS LIST 18 SECTION 1 GENERAL 5 Turn up the volume to a moderate level with the VOL control A MDR RF960R Press the TUNE button briefly for automatic tuning of the headphones If you do not receive a clear audio signal press it again B MDR RF920R Tune the headphones into the frequency of the transmitter with the TUNE control until you can hear the audio signal loud and clear Follow steps 3 and...

Page 3: ...ow 2 1 DISASSEMBLY FLOW Set 2 2 Front Plate R assy Page 3 2 3 Front Plate L assy Page 4 2 4 SW baord Page 5 1 ear pad R 2 three screws B2 6 3 front plate R sub assy 7 RX BASE board 8 craw q housing cap R 9 craws 4 Remove solder 2 places 6 Remove solder 4 places NAT driver R CH RED to RX BASE board to driver L CH housing R sub assy to RX BATTERY board 5 RX BASE board NAT NAT GRN RED ...

Page 4: ... ear pad L 3 front plate L sub assy 5 tow screws DIA 2 8 RX BATTERY board 4 Remove solder 2 places 2 three screws B2 6 driver L CH NAT GRN to RX BASE board 6 7 Remove solder 4 places to SW board to RX BASE board housing L sub assy RED RED RED NAT ...

Page 5: ... suspender assy under the S101 on the SW board SW board suspender suspender tensin spring hanger lid L housing L sub assy S101 1 two screws B2 6 housing L sub assy 2 hunger L 4 hunger L 6 SW board 3 two screws B2 6 5 2 4 SW BOARD 2 5 HOW TO HANG THE TENSION SPRING ...

Page 6: ...6 MDR RF920R RF960R a a b b wires wires wires head band housing L housing R L CH R CH wire groove SET THE LEAD WIRES Set the each lead wires as illustrated below ...

Page 7: ... 11 Adjust the RV303 TUNE to receive a signal Confirm the signal with stereo 12 Check same step 8 13 Set the transmitter CHANNEL switch to 3 14 Adjust the RV303 TUNE to receive a signal Confirm the signal with stereo 15 Check same step 8 3 3 Carrier Modulation Check 1 Set the transmitter CHANNEL switch to 2 2 Set the transmitter NOISE FILTER switch to OFF 3 Input a signal of 1kHz 316mVrms to trans...

Page 8: ...ect an oscilloscope to TP VT 12 When the transmitter off check the waveform of the oscilloscope as follows GND 1 8V 2 3sec 0 6V 13 Set the transmitter CHANNEL switch to 1 14 Push the headphones tuning switch S301 to receive radio frequency 15 Check same step 8 16 Set the transmitter CHANNEL switch to 3 17 Push the headphones tuning switch S301 to receive radio frequency 18 Check same step 8 Settin...

Page 9: ... C328 R328 C335 R366 C302 D301 C362 R315 R334 C367 C327 R321 R316 C329 C336 R318 R355 C314 C313 TP VT R340 C351 R327 C346 R341 R342 R343 R344 R345 R346 R347 R349 C341 C342 R351 R352 IC303 JC301 JC302 JC303 JC304 JC305 JC306 JC307 JC308 JC310 D304 JW311 RV301 CF302 JW307 JW310 JW305 JW302 RV302 C311 C316 C303 C312 C326 C325 C308 C330 C347 C306 C324 L301 C309 C310 CF301 N VOL POWER TUNE E E E RF920R...

Page 10: ...10 MDR RF920R RF960R S301 TUNE RF960R MODEL RV301 Free Run Frequency Adjustment CT1 CT1 RV301 L301 S301 BOARD RX BASE Component side ...

Page 11: ...301 ANT301 ANTENNA R CH SP1 SPEAKER L CH SP2 SPEAKER R CH D304 S101 AUTO ON OFF B POWER BATTERY CHARGE TERMINAL TO TMR RF960R RECHAGEABLE BATTERY NICKEL METAL HYDRIDE BP HP550 OR S301 TUNE RF960R MODEL RF960R MODEL RF920R MODEL RV303 TUNE VOL OSC Q3 RF AMP Q1 MIX Q2 CT1 I O FE UNIT FRONT END 7 15 11 Q4 Q10 D A 6 1 2 3 5 6 1 CK D FF BATTERY VOLTAGE DETECT IC201 1 2 B SWITCH Q201 202 S101 D201 S201 ...

Page 12: ...A T146 SPEAKER SPEAKER 220 6 3V 220 6 3V 100k 100p 2 2k 100p 2 2k 15k 15k 0 1 0 0 0 01 22k 2SC2412K T 146 R SWITCH 0 220 6 3V 0 1 0 1 0 01 10 10 1k 0 01 SLC 22VR3F 2SC2412K T 146 R MUTE 0 1 47k 0 001 33 16V 0 22k 0 0 001 47k 47k 22k 1k 22k 0 22k 22k 0 10k 22k 22k 0 1 10k 1 1 50V 1 50V 22 16V 0 01 22 16V 3 3k 0 022 3 3k 0 022 0 2 2k 0 330 150 0 01 0 01 1 1 10 1 100k 1M 0 01 0 47 16V 0 22 RD2 2SB T1...

Page 13: ...F301 CF302 IC301 R333 IC302 ANTENNA SPEAKER SPEAKER AUTO ON OFF RB411D XC61CN1902NR 0 01 1M 0 001 2SC2412K T B SWITCH 1k 100p 10k 100k 2SB1690K B SWITCH 0 SLC 22VR3F 0 01 1k 220 6 3V 220 6 3V 100k 10 10 0 1 0 1 220 6 3V 0 01 0 33 16V 0 001 15k 1 1 15k 100p 100p 2 2k 1 330 0 01 0 01 1 50V 2 2 50V 22 16V 0 01 22 16V 0 022 3 3k 3 3k 0 022 0 0 0 0 10 4 7 16V 0 47 2 2k 4 7k 0 10 16V 3 3k 0 15p 0 01 5p ...

Page 14: ...2 R325 C333 R314 R330 R331 L302 C344 RV303 R356 R310 C332 R308 IC304 C307 IC301 C350 C357 R305 R333 C361 C328 R328 C335 R366 C302 D301 C362 R315 R334 C367 C327 R321 R316 C329 C336 R318 R355 C314 C313 TP VT R340 C351 R327 C346 R341 R342 R343 R344 R345 R346 R347 R349 C341 C342 R351 R352 IC303 JC301 JC302 JC303 JC304 JC305 JC306 JC307 JC308 JC310 C205 JW201 D304 JW311 RV301 S301 CF302 JW307 JW310 JW3...

Page 15: ... 2 3 4 5 10 9 8 7 6 POWER SWITCH BIAS MUTE CIRCUIT AMP 1 POWER SWITCH IN 1 PRE GND IN 2 REF MUTE SWITCH OUT 1 POWER GND OUT 2 VCC AMP 2 Note on Schematic Diagram All capacitors are in µF unless otherwise noted pF µµF 50 WV or less are not indicated except for electrolytics and tantalums All resistors are in Ω and 1 4 W or less unless otherwise specified A B Line H adjustment for repair Power volta...

Page 16: ... 206 L5 L4 L7 L6 A RX BASE BOARD Page 14 2 3 A 1 B C Ref No Location Q1 C 2 Q2 C 2 Q3 C 3 Semiconductor Location Note on Printed Wiring Boards X parts extracted from the component side Through hole Pattern from the side which enables seeing The other layers patterns are not indicated Caution Pattern face side Parts on the pattern face side seen from Conductor B the pattern face are indicated Parts...

Page 17: ...253 143 01 SCREW B2 6 P TAPPING 3 A 4547 109 A RX BASE BOARD COMPLETE RF920R 3 A 4547 111 A RX BASE BOARD COMPLETE RF960R 4 X 3383 913 1 PLATE R SUB ASSY FRONT RF960R 4 X 3383 915 2 PLATE R SUB ASSY FRONT RF920R 6 3 251 098 01 HOUSING R RF920R 6 X 3383 911 1 HOUSING R SUB ASSY RF960R 7 3 251 102 01 CAP R HOUSING RF920R 8 3 254 082 11 SCREW 9 4 966 792 01 STOPPER LOWER 10 4 966 791 01 STOPPER UPPER...

Page 18: ...0V C30 1 164 381 91 CERAMIC CHIP 62PF 5 50V C39 1 162 964 11 CERAMIC CHIP 0 001uF 10 50V C40 1 162 964 11 CERAMIC CHIP 0 001uF 10 50V C301 1 165 908 11 CERAMIC CHIP 1uF 10 10V C302 1 125 891 11 CERAMIC CHIP 0 47uF 10 10V C303 1 124 231 61 ELECT 4 7uF 20 16V C304 1 164 227 11 CERAMIC CHIP 0 022uF 10 25V C305 1 164 227 11 CERAMIC CHIP 0 022uF 10 25V C306 1 124 234 00 ELECT 22uF 20 16V C307 1 162 970...

Page 19: ...TOR 3SK309XV TL Q2 8 729 209 45 TRANSISTOR 2SC3120 TE85R Q3 8 729 043 92 TRANSISTOR 2SC5084 0 TE85L Q302 8 729 901 81 TRANSISTOR 2SC2412K T 146 R RF960R Q303 8 729 901 81 TRANSISTOR 2SC2412K T 146 R RF960R Q304 8 729 027 44 TRANSISTOR DTC114TKA T146 RF960R RESISTOR R1 1 216 852 11 METAL CHIP 390K 5 1 10W R4 1 216 853 11 METAL CHIP 470K 5 1 10W R5 1 216 847 11 METAL CHIP 150K 5 1 10W R6 1 216 811 1...

Page 20: ...0R VARIABLE RESISTOR RV301 1 241 763 11 RES ADJ CARBON 4 7K FREE RUN FREQUENCY SWITCH S301 1 786 596 11 SWITCH TACTILE TUNE RF960R RESONATOR X1 1 813 239 11 RESONATOR SAW A 4547 106 A RX BATTERY BOARD COMPLETE CAPACITOR C201 1 162 927 11 CERAMIC CHIP 100PF 5 50V C202 1 162 964 11 CERAMIC CHIP 0 001uF 10 50V C203 1 162 970 11 CERAMIC CHIP 0 01uF 10 25V DIODE D201 8 719 975 40 DIODE RB411D IC IC201 ...

Page 21: ...21 MDR RF920R RF960R MEMO ...

Page 22: ...N HISTORY Clicking the version allows you to jump to the revised page Also clicking the version at the upper right on the revised page allows you to jump to the next revised page Ver Date Description of Revision 1 0 2004 02 New ...

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