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Marquee Maintenance & Improvements
(by Mike Parker)

  (Page 8)

Back to Advanced Procedures Index

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5. Horizontal Deflection Module

This board is located between the green and blue tubes.

For this you'll need a good soldering tool, solder and a 220 mfd @ 160vdc cap (C50). And remember that we clean each board as we go with denatured alcohol.

Replace "C50" it's in the modulator circuit on that board, The modulator circuit supplies the operating voltages for the deflection power stage (power MOSFETs), this circuit varies the voltage for the FETs based on the scan rate that the project receives. If this cap leaks, it'll cause erratic width performance, or inability to achieve max horizontal width.

Then we'll move on to soldering various contacts on the board. If you remove this board and closely examine the contacts you'll immediately notice the need for soldering. The contacts that will need this soldering are the three power MOSFETs and two transistors that are mounted to the heatsink:


The next items for soldering are the five relays and six coils that are mounted next to the three large relays:

Next, inspect the three yoke connectors that are attached to the board, look through the plastic connector and look for burns or dark marks in the area where the contacts meet. If you see burn or darkness on that connector, it'll need replacement.

This simple procedure greatly stabilizes this board, and it'll protect the board from failure, because it's very important that these contacts are tightly soldered, if not, as the board heats up, you could experience drifting or even board failure.




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