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1
8) Adjustment initial value
A
All adjustment is performed based on the latest
adjusted value that is considered as initial value
unless the power of the microcomputer is off (back
up is stopped). (There is an exception, though.) If
back up is stopped, automatic adjustment is done
by the initial value, not by the latest adjusted
value.
9) Coefficient indication of adjustment result
It is possible to display and check certain
automatic adjusted (FE, RF offset, FZD cancel,
B
FT, and RFAGC) in test mode.
Coefficient indication of each automatic
adjustment is showed below:
(1) FE, RF offset, FZD cancel
Reference value = 32 (Coefficient 32 means no
adjustment was required.)
Indication is every approx. 40mV.
Example: FZD cancel coefficient = 35
35-32=3X40mV=120mV
Since corrected volume is about +120mV, FE
C
offset before correction is -120mV.
(2) F.T gain adjustment
Reference value: focus, tracking = 20
Coefficient indication / reference value express
adjusted volume.
Example: AGC coefficient = 40
40 / 20 = 2 times (+ 6dB) adjustment was
performed. (It means "since it was originally 1/2
time of loop gain, the entire gain was doubled to
make it to the desired value.")
D
(3) RF level adjustment (RFAGC)
Reference value = 8
Coefficient = 9 - 15 ......Increasing RF level
Coefficient = 7 - 0 ......Decreasing RF level
If a coefficient moves 1, 0.7 - 1dB of gain
changes accordingly.
Maximum gain = when a coefficient is 15, TYP
+6.5dB
E
Minimum gain = when a coefficient is 0, TYP -
6.0dB
F
14
1
2
(Increasing gain)
(Decreasing gain)
CX-3168
2
3
3
4
4
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