Sony WRT-822B, Service Manual

Page: 3 / 46

1
WRT-822B
Table of Contents
1. Operating Instructions
..................................................................... 1-1
2. Service Overview
2-1. Disassembly ................................................................................................ 2-1
2-2. Notes on Parts Replacement ........................................................................ 2-2
2-2-1. EEPROM (IC405) Replacement ................................................ 2-2
2-3. Error Messages ............................................................................................ 2-2
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 .................................................... 3-5
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 ............................................... 3-9
3-2-9. Tone Signal Adjustment ........................................................... 3-10
3-2-10. Battery Alarm Signal Check .................................................... 3-11
3-2-11. Spurious Emissions Check ....................................................... 3-13
4. Spare Parts
4-1. Notes on Repair Parts .................................................................................. 4-1
4-2. Exploded Views .......................................................................................... 4-2
4-3. Electrical Parts List ..................................................................................... 4-3
4-4. Supplied Accessories .................................................................................. 4-7
5. Semiconductor Pin Assignments
............................................. 5-1
6. Block Diagram
....................................................................................... 6-1