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MDR-RF940R

Note:

 

Follow the disassembly procedure in the numerical order given.

HOUSING (R)

SECTION  2

DISASSEMBLY

• This set can be disassembled in the order shown below.

HOUSING (L), SW BOARD
(Page 3)

HOUSING (R)
(Page 3)

HANGER (L)
(Page 4)

HANGER (R), RX BOARD
(Page 4)

SET

1

 ear pad

2

 four screws
(P 2 

×

 6)

4

 front plate (R)

5

 housing (R)

3

 two bosses

HOUSING (L), SW  BOARD

2

 two screws
(P 2 

×

 6)

3

 screw (P 2 

×

 6)

5

 front plate (L)

6

 housing (L)

7

 SW board

4

 two bosses

1

 ear pad

HANGER (R), RX  BOARD

5

 screw
(PWH 2.6 

×

 6)

2

 two screws
(P 2 

×

 10)

1

 two screws
(P 2 

×

 6)

3

 hanger (R)

4

 RX board

6

 two head bands

7

 suspender ass’y

HANGER (L)

4

 screw
(PWH 2.6 

×

 6)

2

 two screws
(P 2 

×

 10)

1

 two screws
(P 2 

×

 6)

5

 two head bands

3

 hanger (L)

6

 suspender ass’y

Summary of Contents for MDR-RF940R

Page 1: ...nected chip component Notice that the minus side of a tantalum capacitor may be dam aged by heat Flexible Circuit Board Repairing Keep the temperature of the soldering iron around 270 C during 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 the conductor when soldering or unsoldering ...

Page 2: ... 2 This section is extracted from instruction manual SECTION 1 GENERAL ...

Page 3: ...ARD Page 4 SET 1 ear pad 2 four screws P 2 6 4 front plate R 5 housing R 3 two bosses HOUSING L SW BOARD 2 two screws P 2 6 3 screw P 2 6 5 front plate L 6 housing L 7 SW board 4 two bosses 1 ear pad HANGER R RX BOARD 5 screw PWH 2 6 6 2 two screws P 2 10 1 two screws P 2 6 3 hanger R 4 RX board 6 two head bands 7 suspender ass y HANGER L 4 screw PWH 2 6 6 2 two screws P 2 10 1 two screws P 2 6 5 ...

Page 4: ......

Page 5: ......

Page 6: ... from the original one Color Indication of Appearance Parts Example KNOB BALANCE WHITE RED Parts Color Cabinet s Color Ref No Part No Description Remark Ref No Part No Description Remark 1 HEADPHONE R SECTION 11 10 9 8 7 6 5 4 3 2 1 SP2 1 1 2 3 MDR RF940R 1 4 966 797 11 PLATE R FRONT 2 4 966 794 11 HOUSING R 3 4 966 800 11 CAP R 4 4 967 909 01 SCREEN CAP 5 4 980 054 01 HANGER R 6 A 4542 441 A RX B...

Page 7: ...SPRING BATTERY COIL 58 4 966 806 01 COVER HANGER L 59 4 966 795 01 BAND HEAD 60 4 980 053 01 HANGER L 61 4 987 590 01 TERMINAL BATTERY 62 4 987 592 01 TERMINAL COMMONNESS BATTERY 63 4 966 799 11 CAP L 64 4 966 793 11 HOUSING L 65 4 966 796 11 PLATE L FRONT 66 1 663 968 21 SW BOARD 67 4 967 909 01 SCREEN CAP 68 3 722 156 01 SPRING COMPRESSION SP1 1 505 117 21 DRIVER L CH 2 HEADPHONE L SECTION SP1 1...

Page 8: ...5PF 5 50V C32 1 163 098 00 CERAMIC CHIP 16PF 5 50V C33 1 163 253 11 CERAMIC CHIP 120PF 5 50V C34 1 163 253 11 CERAMIC CHIP 120PF 5 50V C35 1 163 120 00 CERAMIC CHIP 130PF 5 50V C36 1 163 251 11 CERAMIC CHIP 100PF 5 50V C37 1 164 232 11 CERAMIC CHIP 0 01uF 50V C38 1 164 232 11 CERAMIC CHIP 0 01uF 50V C39 1 163 120 00 CERAMIC CHIP 130PF 5 50V C40 1 163 121 00 CERAMIC CHIP 150PF 5 50V C41 1 163 224 1...

Page 9: ...TRANSISTOR XN1504 TX Q66 8 729 200 63 TRANSISTOR 2SC2712L TE85R Q67 8 729 200 63 TRANSISTOR 2SC2712L TE85R Q68 8 729 200 63 TRANSISTOR 2SC2712L TE85R RESISTOR CHIP CONDUCTOR R01 1 216 093 00 METAL CHIP 68K 5 1 10W R02 1 216 091 00 METAL CHIP 56K 5 1 10W R03 1 216 073 00 METAL CHIP 10K 5 1 10W R04 1 216 001 00 METAL CHIP 10 5 1 10W R05 1 216 001 00 METAL CHIP 10 5 1 10W R08 1 216 125 00 METAL CHIP ...

Page 10: ...VARIABLE RESISTOR RV61 1 238 857 11 RES ADJ CERMET 22K RV91 1 241 853 11 RES VAR CARBON 10K 10K VOL SWITCH S41 1 692 729 21 SWITCH SLIDE CH1 CH2 VIBRATOR X01 1 767 457 11 VIBRATOR CRYSTAL 14 1875MHz 1 663 968 21 SW BOARD SWITCH S1 1 572 467 61 SWITCH PUSH 1 KEY POWER MISCELLANEOUS SP1 1 505 117 21 DRIVER L CH SP2 1 505 117 21 DRIVER R CH HARDWARE LIST 1 7 685 104 19 SCREW P 2X6 TYPE2 NON SLIT 2 7 ...

Page 11: ...SERVICE MANUAL MDR RF940R SUPPLEMENT 1 File this supplement with the service manual AEP Model Subject 1 Modification 2 Electrical Adjustments Ver 1 0 1998 05 ...

Page 12: ...a 22 pF capacitor in parallel with C65 Please use the following part Chip ceramic capacitor 22 pF 1 163 235 11 or 1 163 235 91 SCHEMATIC DIAGRAM Original Service Manual page 7 Location C E 6 8 Added portion RX Board PRINTED WIRING BOARD Original Service Manual page 6 Location D F 9 11 Added portion RX Board Side B C65 22 pF RX Board ...

Page 13: ... a pick up coil See the figure 1 for measuring the local oscillation frequency of RX board Figure 1 2 Turn on the power of the adjusted transmitter 3 Input a signal of 1 kHz 50 mVrms to Lch of the transmitter for avoiding AUTO OFF 4 Set the pick up coil to the RX board as the figure 2 Figure 2 5 Confirm and adjust the frequency by the spectrum analyzer CH1 Adjust CH1 to be the following value by t...

Page 14: ... into TMR RF940R and place the unit the point where is far from MDR RF940R and place the unit in a location where is far from by 5 m 2 Measure the DC voltage at the test point TP2 of RX board of MDR RF940R This DC voltage corresponds to the S curve voltage of FM detection characteristics as shown below If tuned frequency is in the area covered by AFC the center voltage changes when CT41 channel 1 ...

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