Pioneer YPM-2106ZF Посібник з експлуатації - Сторінка 42
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YPM-2306ZF
8) Initial Adjusting Values
All the automatic adjustments are implemented using
the previous adjustment values as the initial values
unless the microcomputer power (the backup power) is
not turned off (though there are some exceptions).
When the backup is turned off, automatic adjustment is
executed based on the initial values rather than the pre-
vious adjustment values.
9) Displaying Coefficients After Adjustment
You can display and check results of some automatic
adjustments (FE and RF offset, FZD cancel and F / T /
RFAGC) from the test mode. The following coefficients
are displayed in each automatic adjustment :
(1) FE and RF offset and FZD cancel
Reference value = 32 (The coefficient of 32 indicates
that no adjustment was required).
The results are displayed in multiples of approxi-
mately 40 mV.
An example : When FZD cancel coefficient = 35
35 − 32 = 3
3 × 40 mV = 120 mV
Since the corrected value is approxi-
mately +120 mV, the FE offset before
adjustment was −120 mV.
(2) F and T gain adjustment
Reference value = Focus/Tracking = 20
A coefficient displayed indicates an amount of
adjustment conducted on the reference value.
An example : When AGC coefficient = 40
40/20 = Overall gain has bee doubled
(+6dB). (The original loop gain of 1/2
has been doubled to have the targeted
overall gain.)
(3) RF level adjustment (RFAGC)
Reference value = 8
Coefficient = 9 to 15 ····· The direction in which the
Coefficient = 7 to 0 ······· The direction in which the
Incrementing or decreasing the coefficient by "1"
varies the gain by 0.7 to 1dB.
Maximum gain = Typically +6.5dB. Coefficient at this
time is 15.
Minimum gain = Typically −6.0dB. Coefficient at this
time is 0.
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RF level is increased (the
gain is increased).
RF level is decreased (the
gain is decreased).