Service manual

SERVICE MANUAL
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4. Removing the FDD Assembly ................................................................................ 4-39
5. Switch PCB ............................................................................................................ 4-40
5.1. Removing the Switch PCB ....................................................................................... 4-41
5.2. Installing the Switch PCB.......................................................................................... 4-41
6. Removing the Main PCB ........................................................................................ 4-42
7. Removing the Shield Plate (ESD) .......................................................................... 4-43
CHAPTER 5 MONITOR REPAIR AND ADJUSTMENT (MODEL CT-1450).............. 5-1
1. Safety Precautions................................................................................................... 5-1
2. Theory of Operation ................................................................................................. 5-3
2.1. Video Process ............................................................................................................ 5-3
2.2. Video Amplifier........................................................................................................... 5-3
2.3. Vertical Circuitry......................................................................................................... 5-4
2.4. Horizontal Sync and Drive.......................................................................................... 5-4
2.5. Horizontal Output Transistor....................................................................................... 5-5
2.6. High Voltage and Focus ............................................................................................. 5-5
3. Adjustment and Servicing......................................................................................... 5-6
3.1. Test Pattern................................................................................................................ 5-6
3.2. Measurement Conditions............................................................................................ 5-7
3.2.1. Display Dimension Measurement.................................................................. 5-7
3.2.2. Raster Centering & Tilt Adjustment (see Fig. 5.3) ......................................... 5-7
3.3. Adjustments ............................................................................................................... 5-8
3.3.1. B+ Voltage Adjustments: None required. ..................................................... 5-8
3.3.2. Horizontal Adjustments................................................................................. 5-8
3.3.3. Vertical Adjustments (see Fig. 5.5) ............................................................... 5-9
3.3.4. Brightness & Contrast................................................................................... 5-9
3.3.5. Focus Adjustment......................................................................................... 5-9
3.3.6. Raster Geometry Adjustments.................................................................... 5-10
3.3.6.1. Pin Cushion/Barrel Correction (top, bottom and sides) Adjustment........ 5-10
3.3.6.2. Trapezoidal Correction (corners) Adjustment ........................................ 5-12
4. Troubleshooting ..................................................................................................... 5-13
5. Control Parts Location............................................................................................ 5-14
6. Monitor Block Diagram ........................................................................................... 5-15
CHAPTER 6 MAINTENANCE .................................................................................... 6-1
1. Lubrication................................................................................................................ 6-1
1.1. Lubricants................................................................................................................... 6-1
1.2. Precautions ................................................................................................................ 6-1
1.3. Lubrication Points....................................................................................................... 6-1