Sky PDS4250, Service Manual, Page: 2 / 62

Contents
I. Parts with the exception of MODULE
1. Safety Precautions 3
2. Product Specification
2-1. SPECIFICATION 4
2-2. Available Input Signal 6
3. BLOCK DIAGRAM 8
4. Description Of Each BLOCK
4-1. A/V BLOCK 9
4-1-1. A/V BLOCK DIAGRAM 9
4-1-2. VIDEO PCB 10
4-1-3. JACK PCB 14
4-1-4. KEY PCB 15
4-1-5. LED PCB 15
4-2. POWER PCB 16
4-3. BASIC CONGIFURATION 17
5. SERVICE MODE
5-1. Entering SERVICE MODE 18
5-2. Default Values For SERVICE MODE Items 18
5-3. Description Of SERVICE MODE Items 19
6. Adjusting Method
6-1. Adjusting WHITE BALANCE 23
6-2. Adjusting POWER PCB 23
7. SOFTWARE UPGRADE Method 25
8. Main PCB Trouble Diagnosis 28
8-1. VIDEO & JACK PCB Trouble Diagnosis 28
8-2. POWER PCB Trouble Diagnosis 33
9. TROUBLE SHOOTING
9-1. Facts You Must Know When Diagnosing And Repairing 34
9-2. Representative Symptoms When Each PCB Breaks Down 34
9-3. Trouble Diagnosis And Repairing Method For Representative Symptoms 35
10. ASSEMBLY LIST 39
11. EXPLODED VIEW 42
II. Parts of MODULE
1. Safety Precautions 43
2. Formation and Specification of Module 46
3. Adjustment 47
4. Trouble Shooting 52
4-1 Checking for No Picture 52
4-2 Hitch Diagnosis Following Display Condition 54
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