Read Harman Kardon FL 8550 (serv.man13) Service Manual online
SERVO BLOCK
1. FOCUS SERVO
When the defect signal is detected, the focus servo Loop is isolated. At this time, the focus servo error
output is outputted through low pass filter formed by connecting a capacitor (0.1
µ
F) between the built-in
470K
Ω
resistor and FDFCT Pin (Pin58). Accordingly, the focus error output is held as just before error
value during the defect.
The peak frequency of the focus phase compensation is at about 1.2KHz when the resistor connected to
PFSET(Pin7) is 510K
Ω
. It is inversely proportional to the resistor connected to the Pin 7.
FL8550
19
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