Sony WRT-847A, Service Manual

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WRT-847A/847B
Table of Contents
1. Operating Instructions
..................................................................... 1-1
2. Service Overview
2-1. Disassembly ................................................................................................ 2-1
2-2. Note on Parts replacement and Reassembly ............................................... 2-4
2-2-1. Precautions on Reassembly ........................................................ 2-4
2-3. Error Messages ............................................................................................ 2-5
3. Electrical Alignment
3-1. Equipment and Tools .................................................................................. 3-1
3-2. Adjustments ................................................................................................. 3-2
3-2-1. Power Supply Voltage Check .................................................... 3-3
3-2-2. Carrier Frequency Adjustment ................................................... 3-4
3-2-3. RF Power Output Adjustment .................................................... 3-4
3-2-4. Reference Frequency Deviation Adjustment ............................. 3-5
3-2-5. Maximum Frequency Deviation Adjustment ............................. 3-6
3-2-6. Distortion Ratio Check ............................................................... 3-7
3-2-7. S/N Check .................................................................................. 3-8
3-2-8. Frequency Characteristics Check ............................................... 3-8
3-2-9. Tone Signal Adjustment ............................................................. 3-9
3-2-10. Battery Alarm Signal Check .................................................... 3-10
3-2-11. Spurious Emissions Check ....................................................... 3-12
3-2-12. Occupied Band Width Check ................................................... 3-13
4. Spare Parts
4-1. Notes on Repair Parts .................................................................................. 4-1
4-2. Exploded Views and Parts List ................................................................... 4-2
4-3. Electrical Parts List ..................................................................................... 4-4
4-4. Supplied Accessories .................................................................................. 4-9
5. Semiconductor Pin Assignments
............................................. 5-1
6. Block Diagram
....................................................................................... 6-1