Focus System
The focus error output of A, B, C and D are given to Pin 27. C4 is required for oscillation-
proof. R7 is set such that FEOUT of Pin 27 becomes 1.46 Vp-p.
During alignment procedure, the DSP IC (MN662790) will adjust the focus balance voltage
V
FBAL
from Pin 30. V
FBAL
varies with reference to the center voltage V
REF2
(=1.65 V) within
±
0.5 V.
The focus gain will change according to the type of disc. For normal disc or CDR disc,
V
GCTRL
is set to V
REF2
; for CDRW disc V
GCTRL
is set to V
REF2
- 0.75 V. At the same time, the
tracking gain is changed too.
A
B
C D
F
PDIC
E
36
34
28
29
27
26
GCTRL
FBAL
Subtraction
R7
FEN
C4
FEOUT
V
GCTRL
C2
C3
R6
V
FBAL
35
33
3
5
C35
C47
R27
R21
R20
FL8380
FL8385
harman/kardon
17
Содержание FL 8385
Страница 11: ...FL8385 FL8385 harman kardon 11 ...
Страница 12: ...FL8385 12 ...
Страница 13: ...FL8385 BLOCK DIAGRAM AN4801 FL8385 harman kardon 13 ...
Страница 20: ...FL8380 FL8385 harman kardon 20 ...
Страница 21: ...FL8380 FL8385 harman kardon 21 ...
Страница 22: ...FL8380 FL8385 harman kardon 22 ...
Страница 23: ...FL8380 FL8385 harman kardon 23 ...
Страница 24: ...FL8380 FL8385 harman kardon 24 ...
Страница 25: ...FL8380 FL8385 harman kardon 25 ...
Страница 46: ...FL8380 FL8385 harman kardon 46 ...
Страница 60: ...FL8385 harman kardon 60 ...
Страница 61: ...FL8385 harman kardon 61 ...
Страница 62: ...FL8385 MAIN BOARD FL8385 harman kardon 62 ...
Страница 63: ...FL8380 FL8385 harman kardon 63 ...
Страница 64: ...harman kardon 64 ...
Страница 65: ......
Страница 66: ...an kardon ...
Страница 67: ...4883 800260 001 FL8385 VFD BOARD VDF BOARD POWER BOARD FL8385 harman kardon 67 ...
Страница 68: ...REMOTE IN OUT BOARD FL8385 harman kardon 68 ...
Страница 69: ...4560 4560 4560 HEADPHONE BOARD FL8385 harman kardon 69 ...