Operation Theorem; H & V Sync. Processor; Vertical Deflection - Acer AM501 Service Manual

15-inch crt monitor

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6.0 OPERATION THEOREM

6.1 H & V sync. processor

The key component of this block is U2, it's function is separate horizontal sync, and vertical sync. To get

the polarity fixed V-out, H-out.

The vertical deflection circuit including synchronizer, vertical oscillator, vertical driver, vertical output

amplifier.

6.2.1 Vertical synchronizer

The vertica1 sync. signal comes from U2 then enter at pin 2 of U401 (TDA9111), to synchronize the

vertical oscillator.

6.2.2 Vertical oscillator and driver circuit

The vertical oscillator is at pin 20,21,22 of U401 and the peripheral component, the vertical linearity can

be set by IIC.

U401 TDA9111 also build-in a vertical driver, a saw-tooth signal output from pin 23.

6.2.3 Vertical output amplifier and vertical centering circuit

U601 TDA8172 is the output amplifier, drive a saw-tooth current to vertical deflection yoke. To move

display up or down. It can be set by IIC.

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