Table Of Contents - Topfield TF4000FI Service Manual

TABLE OF CONTENTS

IMPORTANT ...................................................................................................... 2
1. Safety Instructions ....................................................................................... 5
2. List and Description of The Major Parts ....................................................... 6
2.1. Main Board ............................................................................................................. 6
2.2. Front Board ............................................................................................................ 6
3. Block Diagram of The IRD ........................................................................... 7
4. Block Diagram of The Main Board ............................................................... 8
5. Test and Repair ............................................................................................ 9
5.1. Visual Test .............................................................................................................. 9
5.2. Basic Function Test .............................................................................................. 10
5.2.1. No LED is turned on ................................................................................................................... 10
5.2.2. Some LED have problems.......................................................................................................... 10
5.2.3. Remote Control Unit (RCU) does not work................................................................................. 10
5.2.4. Key of the front panel have problems ......................................................................................... 10
5.2.5. Receiver acts like the key of the Front Board or RCU is pressed............................................... 10
5.2.6. No picture but the OSD works. ................................................................................................... 11
5.2.7. No picture(and no OSD) and No sound...................................................................................... 11
5.2.8. No sound and good picture......................................................................................................... 11
5.2.9. No picture(and no OSD) and good sound .................................................................................. 11
5.2.10. No sound and/or no picture on the RF modulator (Cinch works well) ........................................ 12
5.2.11. No LNB power at all of the vertical and horizontal...................................................................... 12
5.2.12. Incorrect LNB power ................................................................................................................... 12
5.3. The Advanced Test of Main Board. ...................................................................... 13
5.3.1. Voltages on important point ........................................................................................................ 13
5.3.2. Reset .......................................................................................................................................... 13
5.3.3. System Clock .............................................................................................................................. 14
5.3.4. RS232 Data Port (Program download port) and Program download.......................................... 14
5.3.5. LNB power .................................................................................................................................. 15
5.3.6. RF modulator .............................................................................................................................. 16
5.3.7. Video........................................................................................................................................... 16
5.3.8. Audio........................................................................................................................................... 16
5.4. The Advanced Test of Front Board....................................................................... 16
5.4.1. Remote control ........................................................................................................................... 16
5.5. The Advanced Test of SMPS................................................................................ 17
5.5.1. Check the damaged parts........................................................................................................... 17
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