Sony mdr rf 915 r service manual
This is the 14 pages manual for sony mdr rf 915 r service manual.
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Extracted text from sony mdr rf 915 r service manual (Ocr-read)
Page 1
2 MDR-RF915R/RF945R SECTION 1 GENERAL 1. Check the area of your repair for unsoldered or poorly-sol deredconnections. Check the entire board surface for solder splashes and bridges. 2. Check the interboard wiring to ensure that no wires are pinched or contact high-wattage resistors. 3. Look for unauthorized replacement parts, particularlyt ransis tors, that were installed during a previous repair. Point them out to the customer and recommend their replacement. 4. Look for parts which, through functioning, show obvious signs of deterioration. Point them out to the customer and recommend their replacement. 5. Check the B+ voltage to see it is at the values specified. 6. 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 SAFETY CHECK-OUT After correcting the original service problem, perform the following safety checks before releasing the set to the customer. 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. MDR-RF945RK TUNING button VOL control A A 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. This section is extracted from instruction manual. TABLE OF CONTENTS Specifications ............................................................................ 1 1. GENERAL ....................................................................... 2 2. DISASSEMBLY 2-1. RX-BASE Board ...................................................... 3 3. ELECTRICAL ADJUSTMENTS .............................. 4 3-1. Free Run Frequency Check and Adjustment (MRD-RF915R) ....... 5 3-2. Receive Frequency Check and Adjustment (MRD-RF915R) ....... 5 3-3. Carrier Modulation Check (MRD-RF915R) ............. 5 3-4. Separation Check (MRD-RF915R) ........................... 5 5 -Turn up the volume to a moderate level with the VOL control, then tune the headphones in to the frequency o f the transmitter with the TUNING control until you can hear the audio signal loud and clear. MDR-RF915RK Try the above steps 3 and 5 until the receiving performance becomes better. TUNING control VOL control B B 3-5. Free Run Frequency Check and Adjustment (MRD-RF945R) ......... 6 3-6. Receive Frequency Check and Adjustment (MRD-RF945R) ......... 6 3-7. Carrier Modulation Check (MRD-RF945R) ............... 6 3-8. Separation Check (MRD-RF945R) ............................. 6 4. DIAGRAMS 4-1. Block Diagrams ........................................................... 8 4-2. Schematic Diagram ..................................................... 9 4-3. Printed Wiring Board ................................................. 10 5. EXPLODED VIEWS ........................................................11 6. ELECTRICAL PARTS LIST ........................................12
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3 MDR-RF915R/RF945R SECTION 2 DISASSEMBLY 2-1. RX-BASE BOARD - This set can be disassembled in the order shown below. 3Remove the nine solderings. 9 Remove the two solderings. RX-BASE board Solder the each lead wires directly to the position as shown while being cautions of colors. Precaution for installtion Precaution for installtion 7 RX-BASE board q; Switch, push (1 key)Cover (R), hanger No.203 No.203 (black)No.202 (red)No.201 (green)No.201 No.204 No.205 No.204No.202 4 Screw (P 2 × 8) 1 Five screws (P 2 × 6) 2 Set the psuh switch (1 key). Suspender 1 Slide the suspender in the direction of the arrow. 6 Button, tuning (RF945R) Claw Claw 2 5 8