(5-L -3) H Drive Circuit - NEC MultiSync 4FGe Service Manual

5-1-3. H DRIVE Circuit
The horizontal pre-drive pulse is generated from IC5Al (LA7850) pin @ and input to Q503 via Q501 and
power loss. Q504's collector voltage is controlled by both H F/V and H size voltage. The relationship of
Q504 collector voltage, H FN voltage and H size voltage is shown Fig 5-l -6.
PWE-366A
Q504
COLLECTOR
VOLTAGE
(Fig 5-l-6) The Relationship Q504 collector voltage, H FN voltage and H SIZE voltage
(Fig 5-l -5) H Drive circuit
I I I
I
I I
2 3 4 5
61
0501 R511
R509
H F/V=5V
I I I
I I
I
6 7 9
8
TO
I