Sony mdr rf 975 r service manual
This is the 18 pages manual for sony mdr rf 975 r service manual.
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Extracted text from sony mdr rf 975 r service manual (Ocr-read)
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2 MDR-RF975R This section is extracted from instruction manual. Flexible Circuit Board Repairing - Keep the temperature of 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. Notes on chip component replacement - Never reuse a disconnected chip component. - Notice that the minus side of a tantalum capacitor may be damaged by heat. SECTION 1 GENERAL Auto power on/off function When you remove the headphones from your head, the power turns off automatically. Do not allow the self adjusting band to be pulled up, otherwise the headphones will be switched on. The power turns on. 5 Turn up the volume to a moderate level with the VOL control. Press the TUNING button briefly for automatic tuning of the headphones. If you do not receive a clear audio signal, press it again. Try the above steps 3 and 5 until the receiving performance becomes better. TUNING button VOL control TABLE OF CONTENTS Specifications ............................................................................ 1 1. GENERAL ......................................................................... 2 2. DISASSEMBLY 2-1. Driver (R Side), RX-BASE Board ........................... 3 2-2. SW Board, Hanger (R) ............................................. 4 2-3. Holder (R) ................................................................. 4 2-4. Driver (L Side) .......................................................... 5 2-5. Hanger (L) ................................................................ 6 2-6. Holder (L) ................................................................. 6 3. ELECTRICAL ADJUSTMENTS 3-1. Free Run Frequency Check and Adjustments ........... 7 3-2. Receive Frequency Check and Adjustments ............ 7 3-3. Carrier Modulation Check ........................................ 7 3-4. Expander Output Check ............................................ 7 3-5. Separation Check ...................................................... 7 4. DIAGRAMS 4-1. Block Diagrams ....................................................... 11 4-2. Schematic Diagram ................................................. 12 4-3. Printed Wiring Board .............................................. 13 5. XPLODEDVIEWS ....................................................... 14 6. ELECTRICAL PARTSLIST ..................................... 15
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3 MDR-RF975R SECTION 2 DISASSEMBLY 2-1. DRIVER (R SIDE), RX-BASE BOARD - The equipment can be removed using the following procedure . Driver (R side), RX-BASE board Driver (L side), Hanger (L) Set SW board, Harger (R) Holder (L) Holder (R) Note:Follow the disassembly procedure in the numerical order given . Four claws RX-BASE board SW boardSW board (Housing (R) side)Housing (R) Solder the each leads directly to the position as shown while being cautions of colors.Set the each leads as illustrated below. Precaution for installtion Precaution for installtion Precaution for installtion Head band assy (front)(natural) Head band assy (front)(red)Head band assy (rear)(green) Head band assy (rear)(natural) Driver (red)Driver (natural) Red Natural From RX-BASE board. From head band assy (front). From head band assy (rear).From SW board. Driver (R side) ANT qa RX-BASE board 0 Remove the eight solderings. 2 Four screws (M 2 × 5) 1 pad, ear 4 Holder (R),ear pad 3Plate (R) assy, front 6 Driver 8 Charge terminal 9 Volume knob 5 Remove the two solderings. 7 Remove the two solderings. Groove Groove