Topfield TF4000FI Service Manual page 4

5.5.2. Test the diodes............................................................................................................................ 17
5.5.3. Check the Shunt regulator .......................................................................................................... 17
5.5.4. Check the Pothocoupler IC......................................................................................................... 17
5.5.5. Check the Fuse........................................................................................................................... 17
6. PIN description of The Major Parts ............................................................ 18
6.1. Main Board ........................................................................................................... 18
6.2. Front Board .......................................................................................................... 18
6.3. SMPS ................................................................................................................... 18
7. Schematic Diagrams .................................................................................. 19
7.1. Schematic diagram of Front Board ...................................................................... 19
7.2. Schematic diagram of Main Board ....................................................................... 20
7.3. Schematic diagram of SMPS (power supply)....................................................... 21
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